A Review of Mo-Si Intermetallic Compounds as Ultrahigh-Temperature Materials
and Yuhong Chen 2Round 1
Reviewer 1 Report
This is a very interesting review of Mo-Si intermetallic compounds. The authors summarized the properties, preparation methods, issues, and modification of Mo-Si intermetallic compounds.
1. In Line 134, the authors mentioned different crystal orientations will cause different hardness, can you provide more details about it?
2. The authors mentioned the Mo-Si intermetallic compounds attracted the attention of researchers in different fields. Can you also discuss the applications of these materials?
Author Response
Dear Editor and Reviewer:
On behalf of all the authors, I thank you very much for giving us this opportunity to revise our manuscript. We appreciate editor and reviewer very much for their positive and constructive comments and suggestions on our manuscript entitled “A Mini Review of Mo-Si Intermetallic Compound Ultrahigh Temperature Structural Materials”. (processes-1871036).
We carefully studied the comments of the editors and reviewers, and revised the comments made by the editors and reviewers. We have tried our best to revise our manuscript based on the comments. The revised version is enclosed herewith, and we hope to submit it to you for your consideration.
We would like to express our great appreciation to you and reviewer for comments on our paper.
Thank you and best regards.
Yours sincerely,
Liang Jiang
==================================================================
List of Responses
Dear Editor and Reviewer,
Thank you for your very valuable and thoughtful comments and suggestions about the scientific points on our manuscript. We have modified the manuscript accordingly, with detailed and point-by-point corrections and replying listed below:
Replies to the editor and the reviewers’ comments
[Reviewer(s)' Comments]
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Comment: (1) In Line 134, the authors mentioned different crystal orientations will cause different hardness, can you provide more details about it? Reply: Thanks for your comment. We have made the corresponding changes in the revised manuscript.
The text in the paper is changed as follows: “When the crystal orientation is [100], the crystal is the hardest; when the crystal orientation is [110], the crystal is the softest [31].” is changed as “When the crystal orientation is [100], the crystal is the hardest; when the crystal orientation is [110], the crystal is the softest [31]. Rosales et al.[32] investigated that the micro hardness is a function of crystal orientation and Mo3Si single crystals has the hardest crystal orientation of (100), followed by (111) and (110) planes, with a hardness of 1460, 1448 and 1425 kg/mm2, respectively.”.
The following reference has been added. 32 Rosales, I; Synthesis and characterization of Mo3Si single crystal. J. Cryst. Growth. 2008, 310, 3833-3836.
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Comment: (2) The authors mentioned the Mo-Si intermetallic compounds attracted the attention of researchers in different fields. Can you also discuss the applications of these materials? Reply: Thanks for your comment. We have made the corresponding changes in the revised manuscript.
The text in the paper is changed as follows: “Therefore, research on Mo-Si series intermetallic compounds has attracted much attention.” is changed as “Therefore, research on Mo-Si series intermetallic compounds has attracted much attention. Ultrahigh temperature material has high strength, high temperature oxidation resistance and high temperature corrosion resistance, which be used in the aircraft nose cones, the wing leading edge, the rocket nozzle, combustion chamber, hot end of the engine and other key parts or components. ”. The following reference has been added. |
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Other modifications are marked in red font in the revised manuscript. |
Author Response File: 
Author Response.docx
Reviewer 2 Report
Dear authors,
Congratulations for the good work. It is a challenge to design materials that stands their mechanical properties to high temperatures. The aerospace industry especially needs these kinds of materials for the propulsion systems. The energy production could benefit from developing materials with good properties at high temperature, the energy consumption is increasing daily, but the resources are limited and the conventional methods are not environmentally friendly. A lot of research was done on the field, MoSi system was intensively studied, still there are a lot of things to be clarified.
The graphical part is ok, but it was better if you have presented some results of your own to link the authors with the subject of this article. You have used some pictures taken from literature, do you have permission to publish them here (if necessary, even you have linked the reference)?
A few remarks:
Fig. 2. – missing the reference – crystal structure of these compounds is widely presented in the literature
Line 399 – correct “… crystal [102]. 60. Obert [60] …”
Line 460 – I suggest “However, the mechanism used to control the grain size and thus the strength and …”
Line 465 – change “Based on the previous discussion,” to “Based on literature review, …”
Kind regards,
Author Response
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Comment: (1) Fig. 2. – missing the reference – crystal structure of these compounds is widely presented in the literature Reply: Thanks for your criticism and correction. We have made the corresponding changes in the revised manuscript.
The text in the paper is updated as follows:
“Figure 2. Crystal structure of the Mo-Si intermetallic compounds: (a) MoSi2 C11b type; (b) MoSi2 C40 type; (c) Mo5Si3; (d) Mo3Si.” is changed as “Figure 2. Crystal structure of the Mo-Si intermetallic compounds: (a) MoSi2 C11b type [33]; (b) MoSi2 C40 type [34]; (c) Mo5Si3 [35]; (d) Mo3Si [36].”.
The following reference has been added. 33 Harada, Y.; Morinaga, M.; Saso, D.; Takata, M.; Sakata, M.; Refinement in crystal structure of MoSi2. Intermetallics, 1998, 6, 523-527. 34 Tanaka K., Inui H., Yamaguchi M., Koiwa M.; Directional atomic bonds in MoSi2 and other transition-metal disilicides with the C11b, C40 and C54 structures. Mater. Sci. Eng., A. 1999, 261, 158-164. 35 Aronsson B.; Tjomsland O.; Lundén R.; Prydz H.; The Crystal Structure of Mo5Si3 and W5Si3. Acta Chem. Scand. 1955, 9, 1107-1110. 36 Lehmann M.; Saemann-Ischenko G.; Adrian H.; Nölscher C.; Disordered A15 compounds from the Matthias-Valley: Mo3Ge and Mo3Si. Phys. B+C. 1981, 107, 473-474.
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Comment: (2) Line 399 – correct “… crystal [102]. 60. Obert [60] …” Reply: Thanks for your criticism and correction. We have made the corresponding changes in the revised manuscript.
The text in the paper is changed as follows: “60. Obert [60] studied the mechanical properties of Mo5Si3 single crystal and found that the activation energy for creep is 510 KJ/mol-1,” is changed as “Obert et al. [60] investigated that Mo5Si3 single crystal has an activation energy of 510 KJ/mol-1 for creeping process,”.
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Comment: (3) I suggest “However, the mechanism used to control the grain size and thus the strength and …” Reply: Thanks for your criticism and correction. We have made the corresponding changes in the revised manuscript. The text in the paper is changed as follows: “However, the mechanism of the grain size effected on the strength and toughness of alloys” is changed as “However, there is still no clear mechanism used to control the grain size, and thus the strength and toughness of alloys”. |
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Comment: (4) change “Based on the previous discussion,” to “Based on literature review, …” Reply: Thanks for your criticism and correction. We have made the corresponding changes in the revised manuscript. The text in the paper is changed as follows: “Based on the previous discussion, it has been made a certain progress on the research for modification of Mo-Si intermetallic compounds world widely.” is changed as “Based on literature review, it has been made a certain progress on the research for modification of Mo-Si intermetallic compounds world widely”.
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Other modifications are marked in red font in the revised manuscript. |
Author Response File: Author Response.docx
Reviewer 3 Report
Please find my comments attached.
All the best.
Comments for author File: 
Comments.pdf
Author Response
Dear Editor and Reviewer:
On behalf of all the authors, I thank you very much for giving us this opportunity to revise our manuscript. We appreciate editor and reviewer very much for their positive and constructive comments and suggestions on our manuscript entitled “A Mini Review of Mo-Si Intermetallic Compound Ultrahigh Temperature Structural Materials”. (processes-1871036).
We carefully studied the comments of the editors and reviewers, and revised the comments made by the editors and reviewers. We have tried our best to revise our manuscript based on the comments. The revised version is enclosed herewith, and we hope to submit it to you for your consideration.
We would like to express our great appreciation to you and reviewer for comments on our paper.
Thank you and best regards.
Yours sincerely,
Liang Jiang
==================================================================
List of Responses
Dear Editor and Reviewer,
Thank you for your very valuable and thoughtful comments and suggestions about the scientific points on our manuscript. We have modified the manuscript accordingly, with detailed and point-by-point corrections and replying listed below:
Replies to the editor and the reviewers’ comments
General comments:
[Reviewer(s)' Comments]
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Comment: (1) ‘Mini’in the title reduces the interest to read the paper. Probably remove the word. Reply: Thanks for your comment. We have removed the word in the title. |
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Comment: (2)Rephrase the title. Suggestion- A Review on Mo-Si Intermetallic Compounds as Ultrahigh Temperature Structural Materials. Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (3) In line 13, please decide Mo-Si is a compound or a material. Better to write Mo-Si compound based UHTM. Reply: Thanks for your correction. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (4) Line. 15, what are those high and new technologies, please mention in the paper. Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. As an important material to meet the demands of advanced high temperature structural applications in the range 1200-1600℃, in oxidizing and aggressive environments, it has attracted the attention of researchers in aerospace, energy, chemical industry, machinery, mechanical metallurgy, and other fields. |
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Comment: (5) Line 16, Researchers…… This seems like a part of introduction. Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (6) Please rewrite the abstract, the abstract now seems like a part of the Introduction. Structural materials require more characteristics (like creep resistance, stiffness, flexibility, young modulus, thermal expansion etc.) not just high melting point, high hardness, or suitable density. Better to write good mechanical properties including hardness, density, refractoriness, etc. Please write Why you made this study and How you do it? Rest move to introduction. Reply: Thanks for your comment. We have rewrite the abstract and marked them in red font in the revised manuscript. |
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Comment: (7) Please define UHTM? What are they, what r desired property, how many of them r in use in current industry, what are their competitors, and then why MoSi UHTM? Please please think about it and include in into. Reply: Thanks for your comment. We have defined UHTM in introdution and marked them in red font in the revised manuscript. “Ultrahigh temperature material refers to a single or combination of materials that can be used at temperatures above 1600-2000℃, including refractory metals, ceramic matrix composites and modified C/C composites.Ultrahigh temperature material has high strength, high temperature oxidation resistance and high temperature corrosion resistance, which be used in the aircraft nose cones, the wing leading edge, the rocket nozzle, combustion chamber, hot end of the engine and other key parts or components. From the aspect of use, ultrahigh temperature materials mainly include ultra-high temperature structural materials and ultra-high temperature protection materials. Ultrahigh temperature structural materials require high temperature ablative and oxidation resistance of materials, but also require materials with good high temperature mechanics and other comprehensive properties.” |
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Comment: (8) In several places authors describe more hardness, more melting point, wear rate is good, more brittle at RT. This is not fair in a review paper, you have to mention the values (may be the range of values) and cite the source. Now it’s like a story without any scientific explanation or citation.Please include values wherever you write about less or more and cite the paper who said it? Reply: Thanks for your comment. We have added picture of different materials systems application at high temperatures.
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Comment: (9) Also mention the values are better or worse (less or more) in comparison to what? Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (10) Line 33, iron-nickel based alloys? Or Iron and Nickel-based alloys? Reply: Thanks for your correction. It’s Iron and Nickel-based alloys.We have made changes and marked them in red font in the revised manuscript. |
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Comment: (11) Usually when a material has high strength at HT, their oxidation is beneficial. But, In Line 38, C/C is carbon/carbon I guess? Authors say, they maintain good strength at HT and later say poor oxidation resistance. What makes their oxidation poor? Please mention. Reply: Thanks for your comment. In an oxidizing atmosphere such as air, the oxidation reaction of carbon at high temperature is: 2C+O2=2CO; C+O2=CO2 The oxidation of carbon can be carried out at lower partial pressure of oxygen. The oxidation rate is related to the partial pressure of oxygen, temperature and the structure of carbon material (microstructure, pores, microscopic defects). The rate of carbon oxidation is also related to the rate of oxygen diffusion. The higher the temperature, the higher the diffusion rate and the higher the oxidation rate.
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Comment: (12) Line 35, Ceramics based composites really have poor thermal conductivity? I guess ceramics incorporation improves the thermal conductivity? Reply: Thanks for your correction. the reinforced ceramic materials showed significant improvements in their thermal transport and electrical conduction properties,and crack propagation was limited (increasing the strength). The enhanced characteristics allowed ceramics based composites to be engaging materials for structural applications.We have made changes and marked them in red font in the revised manuscript. |
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Comment: (13) Line 46, Please mention which metal silicide authors are talking about? Again it’s like a story if no values or names of material is given. Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. Table 2. Structure and properties of some silicides with melting points over 2000℃
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Comment: (14) Line 49, what about humid environment or normal air? Structures don’t stay only in oxygen and nitrogen. Could be vacuum or normal air? (like heat exchangers). Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (15) Line 52, 58, 15, How many times authors wish to repeat the same word. i.e. ‘interest of researchers’? Please don’t repeat. There are already several repetitions throughout the manuscript. Please rephrase. Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (16) Line 52,53. Which ceramics authors talk about, please mention name or what based? WC has a melting point of 2800 C, more than the UHTM defined in the paper. Reply: Thanks for your comment. We compare them to silicon-based ceramics and marked them in red font in the revised manuscript. |
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Comment: (17) Line 52,53, If authors wish to compare their results with C/C composites (a lot of repetitions). Its better to write their properties. Audience would like to see a comparison Reply: Thanks for your suggestion. We have removed all comparation to C/C composites and marked them in red font in the revised manuscript. |
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Comment: (18) Line 71-75, Authors talk about different stoichiometry of Mo-Si compounds but fail to mention any values. In line 72, 73, 74 its too much use of more and less adjective. Use values please. Or make a table first and use more and less and say as shown in the table. Reply: Thanks for your comment. We have added a table(Table2) of different stoichiometry of Mo-Si compounds. Table 2. Mo-Si intermetallic phase crystallography and physical parameters .
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Comment: (19) Please add a table of different Mo-Si based materials and their mechanical, thermal properties. For instance, audience might not know all the materials based on Mo-Si. Reply: Thanks for your comment. We have added a table(Table3) of different Mo-Si based materials and their mechanical, thermal properties. Table 3. Mo-Si intermetallic phase crystallography and physical parameters [24–26].
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Comment: (20) I would recommend, please add a table or picture, where you compare few known UHTM. Or the ones you describe in the paper Reply: Thanks for your comment. We have added table(Table1)of different UHTMs.
Table 1. Potential materials systems application at high temperatures .
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Comment: (21) Line 34, please mention some existing superalloys? Are they used as UHTM too? Please mention. Reply: Thanks for your correction. single-crystal nickel-base superalloys only can function at temperatures nearing 1150 ℃, i.e., close to90% of their melting points，so they can’t be defined UHTMs. |
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Comment: (22) In the whole manuscript authors, never describe tribology, wear resistance or friction of these compounds. Please think of it. It’s an important parameter in structural material. For. Example Mo may oxidise and impart friction and wear reduction. Ref. https://doi.org/10.3390/ma15051695 might help in understanding oxidation at HT more. Some oxides at HT are good to improve mechanical property or protect the base material (covered by oxides). Please think of it as structural materials. Reply: Thanks for your suggestion. Monolithic MoSi2 material has been found to be exceptionally wear resistant in abrasive environments, with a wear mechanism similar to that of oxide ceramics. Moreover, the wear resistance of MoSi2 can be further improved with the addition of second phases.We have made changes and marked them in red font at the end of the Subchapter 3.2.
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Comment: (23) Line 117, what is the value of higher melting point? Reply: We have added the melting point value of MoSi2 and marked them in red font in the revised manuscript. |
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Comment: (24) 117-120, please mention values of CTE, melting point, thermal conductivity. Brittle to ductile transition temperature, fracture toughness, hardness? Reply: We have added these values of MoSi2 and marked them in red font in the revised manuscript. |
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Comment: (25) Subchapter 3, Line 229-276, Do mechanical properties improve/decline on alloying? If yes, how much? Please gives values or by how much times? Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript.
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Comment: (26)Line 283, introduce and reinforce is a similar word. Please rephrase. Reply: According to the reviewer’s suggestion, we have double checked them carefully. Also we have further revised the manuscript with the help of some professors in our institute. According to their suggestions, the expressions in English have been further improved. |
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Comment: (27) What do you mean strong and tough phase, please give examples? And cite the work Reply: Thanks for your comment. The toughening phase of MoSi2 include continuous fiber (ceramic fiber, refractory metal fiber) and discontinuous fiber (whisker, particle). Petriovic summarized the results of recent studies on MoSi2 structural composites and pointed out that the toughening effect in descending order is continuous fiber, ductile metal, ZrO2 phase transition, second phase whisker or particle. Table 6. Room-temperature fracture toughness of MoSi2-based composites[71].
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Comment: (28) Subchapter 3.2., Line 282-295, please mention values at least where you can. Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (29) Line 298, what kind of strengthening mechanism takes place with ceramic addition? Solid phase, liquid phase, precipitation? And which researcher said it? Is it common for all ceramic addition or there are some? Please cite work Reply: Thanks for your comment. The effects of several different single composite additions, including Mo5Si3, SiO2, CaO and TiC, all in particulate form, was investigated as an elastically hard, strong, brittle second phase which can potentially strengthen MoSi2 at high temperatures and impart low temperature toughness by crack deflection processes. Table 7. Coefficients of thermal expansion (CTE) and melting temperatures Tm for MoSi2 and several potential particulate additions.[108]
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Comment: (30) Line 452, what does compressively means here? May be impressive? Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (31) Line 456,457. In abstract and introduction, authors nowhere mention ‘Alloying’. Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (32) Line 457, what mechanical aspect, please mention properties (such as CTE, Creep, Hardness) Both abstract and conclusion. Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (33) There is no mention of ‘Grain refinement’in introduction or abstract? Or mechanism of grain size. Please rephrase. Reply: Thanks for your suggestion. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (34) Please mention in intro what are the rare earths and oxides addition to improve the property? Reply: Thanks for your suggestion. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (35) Please refrain from talking about‘mathematical model should be established to quantitatively study the relationship between the oxidation behavior and the microstructure of Mo-Si-based intermetallic compounds.’The paper nowhere describes about any kind of mathematical model or simulation. Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (36) The paper nowhere talks about how ‘Nanocrystallization’ changes MoSi UHTM characteristics. Why do authors mention this in conclusion? Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (37)Conclusion should be introduction of the paper. Authors talk so many things in conclusion, but use it nowhere in the body of manuscript. Better to move conclusion to introduction. Reply: Thanks for your comment. We have made changes and marked them in red font in the revised manuscript. |
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Comment: (38) Please write what is future of such materials. Reply: Thanks for your suggestion. We have writen changes and marked them in red font in the revised manuscript. As a new high temperature structural material, Mo-Si series intermetallic compounds have the following four structural applications :(1) as the matrix of Mo-Si based composite materials; (2) as the reinforcing agent of structural ceramic composites to improve the mechanical properties of the materials at high temperature; (3)because of its high melting point and excellent high temperature oxidation resistance, it becomes a high temperature welding material for structural ceramics; (4)used as high temperature anti-oxidation coating for refractory metals and carbon-based materials. With the development of aviation, aerospace, chemical industry, metallurgy, transportation, national defense and other industries, the application of Mo-Si series intermetallic compounds as high temperature structural materials will be more and more wide. |
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Comment: (39) Please improve English, too may repetitions of several words. Please ask a native English speaker to check before submission. Reply: According to the reviewer’s suggestion, we have double checked them carefully. Also we have further revised the manuscript with the help of some professors in our institute. |
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Comment: (40) Please use MDPI English language correction, if you need. Reply: According to their suggestions, the expressions in English have been further improved. |
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Comment: (41) Please rewrite ABSTRACT and CONCLUSION. Reply: Thanks for your comment. We have rewrite the abstract and conclusion. |
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Comment: (42) Clearly describe what you are doing in abstract and answer them in conclusion Reply: Thanks for your comment. We have rewrite the abstract and conclusion. |
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Other modifications are marked in red font in the revised manuscript. |
Author Response File: Author Response.docx
Round 2
Reviewer 3 Report
The authors have made impressive improvements. The manuscript is now very understandable and demonstrates the idea behind the work done. Hence, I recommend the publication of this manuscript after a small correction:
1- I hope the new title of the manuscript is "A Review on Mo-Si Intermetallic Compounds as Ultrahigh Temperature Structural MATERIALS"?
Because I can see the title as "A Review on Mo-Si Intermetallic Compounds as Ultrahigh Temperature Structural" in the corrected manuscript.
2- Figure 2 should be probably mentioned in the body of the manuscript too, Please check.
3-Reference and permission should be added to Figures (or their subparts) at the END.
Author Response
Dear Editor and Reviewer:
On behalf of all the authors, I thank you very much for giving us this opportunity to revise our manuscript. We appreciate editor and reviewer very much for their positive and constructive comments and suggestions on our manuscript entitled “A Mini Review of Mo-Si Intermetallic Compound Ultrahigh Temperature Structural Materials”. (processes-1871036).
We carefully studied the comments of the editors and reviewers, and revised the comments made by the editors and reviewers. We have tried our best to revise our manuscript based on the comments. The revised version is enclosed herewith, and we hope to submit it to you for your consideration.
We would like to express our great appreciation to you and reviewer for comments on our paper.
Thank you and best regards.
Yours sincerely,
Liang Jiang
==================================================================
List of Responses
Dear Editor and Reviewer,
Thank you for your very valuable and thoughtful comments and suggestions about the scientific points on our manuscript. We have modified the manuscript accordingly, with detailed and point-by-point corrections and replying listed below:
Replies to the editor and the reviewers’ comments
[Reviewer(s)' Comments]
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Comment: (1) I hope the new title of the manuscript is "A Review on Mo-Si Intermetallic Compounds as Ultrahigh Temperature Structural MATERIALS"? Reply: Thanks for your correction. We have made the corresponding changes in the revised manuscript. |
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Comment: (2) Figure 2 should be probably mentioned in the body of the manuscript too, Please check. Reply: Thanks for your correction. We have made the corresponding changes in the revised manuscript. The text in the paper is changed as follows: “Three ordered compounds are included in the Mo-Si binary phase diagram, i.e., MoSi2, Mo5Si3, and Mo3Si, as shown in Figure 2 [15].” |
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Comment: (3)Reference and permission should be added to Figures (or their subparts) at the END. Reply: Thanks for your correction. We have made the corresponding changes in the revised manuscript. |
Author Response File: Author Response.docx
