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Collection of Papers in Materials Science from Estonia

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A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 14393

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Special Issue Editor

Prof. Dr. Irina Hussainova

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Guest Editor

Department of Mechanical and Industrial Engineering, Tallinn University of Technology, 19086 Tallinn, Estonia
Interests: composites; ceramics; biomaterials; nanomaterials; materials science; tribology; additive manufacturing; powder metallurgy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

I have the pleasure to invite you to submit a manuscript to the forthcoming Special Issue, “Collection of Papers in Materials Science from Estonia”, for the journal Materials.

For Estonia, with a total population significantly smaller than that of cities such as Tokyo or Moscow, the contributions of research teams to the development of high-tech products and recognized innovations are significant and pushing boundaries in gaining new knowledge.

The Special Issue will publish original research works and the latest achievements in theoretical and experimental studies of different engineering materials, which are performed by the scientists of Estonia. Therefore, there are no limitations on topics and both original papers and reviews on the latest progress are very welcome.

Reports related to Materials Science that highlight novelty and/or successful commercial applications of the developed materials and structures are of the greatest interest for the issue. Our mission is to demonstrate the high potential and the wide spectrum of studies carried out in Estonia.

Prof. Dr. Irina Hussainova
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

Material Science
Material Synthesis
Material Structures
Material Characterization
Material Properties
Applications of Advanced Materials

Published Papers (5 papers)

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Research

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11 pages, 2960 KiB

Open AccessArticle

Thermal, Mechanical, and Acoustic Properties of Polydimethylsiloxane Filled with Hollow Glass Microspheres

by Sergei Vlassov, Sven Oras, Martin Timusk, Veronika Zadin, Tauno Tiirats, Ilya M. Sosnin, Rünno Lõhmus, Artis Linarts, Andreas Kyritsakis and Leonid M. Dorogin

Materials 2022, 15(5), 1652; https://doi.org/10.3390/ma15051652 - 23 Feb 2022

Cited by 8 | Viewed by 2335

Abstract

Polydimethylsiloxane (PDMS) is the most widely used silicon-based polymer due to its versatility and its various attractive properties. The fabrication of PDMS involves liquid phase cross-linking to obtain hydrophobic and mechanically flexible material in the final solid form. This allows to add various fillers to affect the properties of the resulting material. PDMS has a relatively low Thermal Conductivity (TC), in the order of 0.2 W/mK, which makes it attractive for thermal insulation applications such as sealing in construction. Although a further decrease in the TC of PDMS can be highly beneficial for such applications, most research on the thermal properties of PDMS composites have focused on fillers that increase the TC rather than decrease it. In the present work, we propose a simple and reliable method for making a PDMS-based composite material with significantly improved thermal insulation properties, by adding hollow glass microspheres (HGMs) to the mixture of the liquid base and the cross-linker (10:1 ratio), followed by degassing and heat-assisted crosslinking. We obtained a 31% reduction of thermal conductivity and a 60% increase in the elastic modulus of samples with HGM content of 17% by weight. At the same time, the sound insulation capacity of the PDMS-HGM composite is slightly decreased in comparison to pure PDMS, as a result of its lower density. Finally, the wettability of the samples had no dependence on HGM content. Full article

(This article belongs to the Special Issue Collection of Papers in Materials Science from Estonia)

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14 pages, 5398 KiB

Open AccessArticle

Hot Sliding Wear of 88 wt.% TiB–Ti Composite from SHS Produced Powders

by Rahul Kumar, Le Liu, Maksim Antonov, Roman Ivanov and Irina Hussainova

Materials 2021, 14(5), 1242; https://doi.org/10.3390/ma14051242 - 5 Mar 2021

Cited by 15 | Viewed by 2614

Abstract

Titanium alloys and composites are of great interest for a wide variety of industrial applications; however, most of them suffer from poor tribological performance, especially at elevated temperatures. In this study, spark plasma sintering was utilized to produce a fully dense and thermodynamically stable TiB–Ti composite with a high content of ceramic phase (88 wt.%) from self-propagating high temperature synthesized (SHS) powders of commercially available Ti and B. Microstructural examination, thermodynamic assessments, and XRD analysis revealed the in situ formation of titanium borides with a relatively broad grain size distribution and elongated shapes of different aspect ratio. The composite exhibits a considerable hardness of 1550 HV30 combined with a good indentation fracture toughness of 8.2 MPa·m^1/2. Dry sliding wear tests were performed at room and elevated temperature (800 °C) under 5 and 20 N sliding loads with the sliding speed of 0.1 m·s⁻¹ and the sliding distance of 1000 m. A considerable decline in the coefficient of friction and wear rate was demonstrated at elevated temperature sliding. Apart from the protective nature of generated tribo-oxide layer, the development of lubricious boric acid on the surface of the composite was wholly responsible for this phenomenon. A high load bearing capacity of tribo-layer was demonstrated at 800 °C test. Full article

(This article belongs to the Special Issue Collection of Papers in Materials Science from Estonia)

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Review

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39 pages, 32706 KiB

Open AccessReview

Abrasion and Erosion Resistance of Cermets: A Review

by Jakob Kübarsepp, Kristjan Juhani and Marek Tarraste

Materials 2022, 15(1), 69; https://doi.org/10.3390/ma15010069 - 22 Dec 2021

Cited by 24 | Viewed by 3934

Abstract

WC-based hardmetals are employed widely as wear-resistant ceramic–metal composites for tools and wear parts. Raw materials supply, environmental concerns and some limitations of hardmetals have directed efforts toward development of alternative wear-resistant composites–cermets. We present a current state of knowledge in the field of ceramic-rich (≥50 vol%) cermets behavior in abrasion and erosion conditions, which are the dominant types of wear in many industrial applications. Distinction is made between two-body and three-body abrasion, solid-particle erosion, and slurry erosion. Cermets, in particular TiC-, Ti(C,N)- and Cr₃C₂-based composites and hardmetals, are compared for their abrasive and erosive wear performance and mechanism. The review enabled formulation of tribological conditions in which cermets may be comparable or have potential to outperform WC-Co hardmetals. Hardmetals, in general, outperform cermets in abrasion and solid-particle erosion at room and moderate temperatures. However, cermets demonstrate their potential mainly in severe conditions—at elevated temperatures and corrosive (oxidation, electrochemical corrosion) environments. Full article

(This article belongs to the Special Issue Collection of Papers in Materials Science from Estonia)

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20 pages, 8016 KiB

Open AccessReview

SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

by Sofiya Aydinyan, Suren Kharatyan and Irina Hussainova

Materials 2021, 14(17), 5117; https://doi.org/10.3390/ma14175117 - 6 Sep 2021

Cited by 7 | Viewed by 1996

Abstract

The capability of self-propagating high-temperature synthesis (SHS) to produce powders that are characterized by a high sintering ability, owing to high heating and cooling rates inherent to the exothermic reaction, is of a special interest for the industry. In particular, SHS-derived powders comprise a significant defect concentration in order to effectively enhance the mass transfer processes during the sintering, which allows for the successful consolidation of difficult-to-sinter materials at relatively low sintering temperatures. From this perspective, the design of precursors suitable for sintering, synthesis in a controlled temperature regime and the optimization of geometrical and structural parameters of SHS powders as a potential feedstock for the consolidation is of key importance. Here, we report on the comparative studies concerning the SHS processing of composites for advanced powder metallurgy techniques. The synthesis and sintering peculiarities of the SHS through coupled reactions in the Me’O₃(WO₃,MoO₃)-Me’’O(CuO,NiO)-Mg-C, Ti-B-Al₁₂Mg₁₇ systems are comparatively reviewed. The SHS coupling approach was used for the preparation of powders with a tuned degree of fineness (a high specific surface area of particles), a high-homogeneity and a controllable distribution of elements via both the regulation of the thermal regime of combustion in a wide range and the matching of the thermal and kinetic requirements of two interconnected reactions. Microstructural features of the powder feedstock greatly contributed to the subsequent consolidation process. Full article

(This article belongs to the Special Issue Collection of Papers in Materials Science from Estonia)

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18 pages, 6905 KiB

Open AccessReview

Aluminate-Based Nanostructured Luminescent Materials: Design of Processing and Functional Properties

by Rocío Estefanía Rojas-Hernandez, Fernando Rubio-Marcos, José Francisco Fernandez and Irina Hussainova

Materials 2021, 14(16), 4591; https://doi.org/10.3390/ma14164591 - 16 Aug 2021

Cited by 4 | Viewed by 2657

Abstract

Interest in luminescent materials has been continuously growing for several decades, looking for the development of new systems with optimized optical properties. Nowadays, research has been focused on the development of materials that satisfy specific market requirements in optoelectronics, radioelectronics, aerospace, bio-sensing, pigment applications, etc. Despite the fact that several efforts have made in the synthesis of organic luminescent materials, their poor stability under light exposure limits their use. Hence, luminescent materials based on inorganic phosphors are considered a mature topic. Within this subject, glass, glass-ceramics and ceramics have had great technological relevance, depending on the final applications. Supposing that luminescent materials are able to withstand high temperatures, have a high strength and, simultaneously, possess high stability, ceramics may be considered promising candidates to demonstrate required performance. In an ongoing effort to find a suitable synthesis method for their processing, some routes to develop nanostructured luminescent materials are addressed in this review paper. Several ceramic families that show luminescence have been intensively studied in the last few decades. Here, we demonstrate the synthesis of particles based on aluminate using the methods of sol-gel or molten salts and the production of thin films using screen printing assisted by a molten salt flux. The goal of this review is to identify potential methods to tailor the micro-nanostructure and to tune both the emission and excitation properties, focusing on emerging strategies that can be easily transferred to an industrial scale. Major challenges, opportunities, and directions of future research are specified. Full article

(This article belongs to the Special Issue Collection of Papers in Materials Science from Estonia)

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