Effects of Mold Materials on the Interfacial Reaction between Magnesium Alloy and Ceramic Shell Mold during Investment Casting
Abstract
:1. Introduction
2. Experimental Procedure
2.1. Shell Mold Preparation
2.2. Melting and Casting Experiments
2.3. Evaluation of Microstructure and Mold-Metal Reaction
3. Results and Discussions
3.1. Surface Structure of the Investment Castings
3.2. Section Structure of the Investment Castings
3.3. Microstructure and Mechanical Properties
4. Conclusions
- (1)
- Surface layer materials have a significant effect on the interfacial reaction between the AZ91D alloy investment casting and the ceramic shell mold. The chemical stability of the Al2O3 mold is better than that of the ZrSiO4 mold.
- (2)
- A serious reaction occurred on the casting surface of the ZrSiO4 mold; the main substance reacting with the magnesium alloy is silica. Dense black residues are formed on the casting surface and they mainly contain the reaction products MgO and Mg2Si. The interfacial reaction equation is: 4Mg + SiO2 = Mg2Si + 2MgO.
- (3)
- Wall thickness has a great influence on the interfacial reaction between the magnesium alloy and the ZrSiO4 mold. The interfacial reaction become more severe as the wall thickness increases. However, for the Al2O3 mold the sample thickness has no obvious effect on the mold-metal interface.
- (4)
- The Al2O3 mold has a good chemical stability to the magnesium molten alloy, leading to a high surface quality investment casting with a smooth and light surface. The main component of the surface film was MgO and Mg2F, and the reaction layer was 1.5 μm thin on average.
- (5)
- The casting thickness have a great influence on the microstructures and mechanical properties of AZ91D investment casting. The casting at 15 mm thickness has the smallest grain size and highest mechanical properties, with a 235 MPa UTS and 5.4% EL.
Author Contributions
Funding
Conflicts of Interest
References
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Mold Type | Coat No. | Slurry | Stucco | Dry Time (h) | |
---|---|---|---|---|---|
Oxide | Binder | ||||
ZrSiO4 mold | 1 | zircon (325 mesh) | Colloidal silica | zircon powder (120 mesh) | 12 |
2–6 | mullite (120 mesh) | Colloidal silica | mullite (40–80 mesh) | 8 | |
7 | mullite (120 mesh) | Colloidal silica | 8 | ||
Al2O3 mold | 1 | corundum (325 mesh) | alkaline zirconium sol | corundum powder (120 mesh) | 12 |
2–6 | mullite (120 mesh) | Colloidal silica | mullite (40–80 mesh) | 8 | |
7 | mullite (120 mesh) | Colloidal silica | 8 |
Al | Zn | Mn | Fe | Si | Cu | Ni | Mg |
---|---|---|---|---|---|---|---|
8.95 | 0.54 | 0.33 | <0.001 | <0.01 | <0.001 | <0.001 | Bal. |
Thickness | UTS/MPa | YS/MPa | δ/% |
---|---|---|---|
15 mm | 235 | 167 | 5.4 |
30 mm | 214 | 147 | 5.6 |
45 mm | 194 | 121 | 4.0 |
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Hao, Y.; Liu, J.; Du, J.; Zhang, W.; Xiao, Y.; Zhang, S.; Yang, P. Effects of Mold Materials on the Interfacial Reaction between Magnesium Alloy and Ceramic Shell Mold during Investment Casting. Metals 2020, 10, 991. https://doi.org/10.3390/met10080991
Hao Y, Liu J, Du J, Zhang W, Xiao Y, Zhang S, Yang P. Effects of Mold Materials on the Interfacial Reaction between Magnesium Alloy and Ceramic Shell Mold during Investment Casting. Metals. 2020; 10(8):991. https://doi.org/10.3390/met10080991
Chicago/Turabian StyleHao, Yiwei, Jinxue Liu, Jiang Du, Wenjie Zhang, Yang Xiao, Shaojun Zhang, and Peixu Yang. 2020. "Effects of Mold Materials on the Interfacial Reaction between Magnesium Alloy and Ceramic Shell Mold during Investment Casting" Metals 10, no. 8: 991. https://doi.org/10.3390/met10080991