Properties and Mechanism of Nano-Al2O3 Toughened MoSi2 Composite
[1]Liz,Zhang Yu,Zhou Ying,et al.Properties and Mechanism of Nano-Al2O3 Toughened MoSi2 Composite[J].Journal of Zhengzhou University (Engineering Science),2019,40(06):62-67.[doi:10.13705/j.issn.1671-6833.2019.03.010]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
40
Number of periods:
2019 06
Page number:
62-67
Column:
Public date:
2019-11-16
- Title:
- Properties and Mechanism of Nano-Al2O3 Toughened MoSi2 Composite
- Keywords:
- Nano Al2O3 particles; Vacuum reaction hot pressing sintering; MoSi2 composite ceramics; Toughened
- CLC:
- TB332
- DOI:
- 10.13705/j.issn.1671-6833.2019.03.010
- Abstract:
- In this experiment, MoSi2 composite ceramics were prepared by wet-grinding and mixing nano-sized Al2O3 particles of the different volume fractions with Mo powder and Si powder (molybdenum-silicon molar ratio of 1:2), and its physical properties such as density, hardness and fracture toughness were tested. The phase composition, micro-morphology and micro-elemental composition of the prepared samples were analyzed by XRD, SEM and EDS. The effects of nano-Al2O3 particles with the different volume fractions on the properties of MoSi2 composite ceramics were discussed. The results show that: (1) The density, hardness and fracture toughness of MoSi2 can be effectively improved by adding a small amount of nano-Al2O3 compared with a single MoSi2 phase, the density, hardness and fracture toughness of nano-102%, 119% and 167% respectively; (2) Under the vacuum reaction hot-pressing sintering, a small amount of nano-Al2O3 incorporates the lattice distortion of the MoSi2 composite ceramics, which is beneficial to improve the fracture toughness; (3) As the amount of nano-Al2O3 increases, the dispersibility of nano-Al2O3 in the MoSi 2-based material decreases, resulting in the decrease of the physical properties?of the MoSi2 composite ceramic.
- References:
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Last Update:
2019-11-25