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卷
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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[1] 黄文江,周颖,李斯,等.典型MoSi2发热元件物相与显微结构分析[J].郑州大学学报(工学版), 2017, 38(6):88-91.[2] PETROVIC J J, VASUDEVAN A K.Key develo-pments in high temperature structural silicides[J].Materials science & engineering A, 1999, 261(1/2):1-5.[3] 张来启, 高强, 林均品.MoSi2超高温结构材料的研究进展[J].中国材料进展, 2015, 34(2):126-135.[4] 孟维,马成良,葛铁柱,等.稳定性锆镁白云石合成材料的制备、结构和性能研究[J].郑州大学学报(工学版), 2016, 37(4):40-43.[5] 李妤婕,武志红,张聪.保护气氛下反应烧结MoSi2/Al2O3复合陶瓷[J].复合材料学报, 2017, 34(5):1034-1039.[6] 符文彬,代明江,韦春贝,等.SiC/MoSi2高温抗氧化涂层的制备及性能探究[J].稀有金属材料与工程, 2016, 45(10):2543-2548.[7] AIKIN J R R M.Strengthening of discontinuously reinforced MoSi2 composites at high temperature[J].Materials science & engineering A, 1992, 155(S1/S2):121-133.[8] 徐金富,费有静,张学彬,等.纳米ZrO2颗粒增强MoSi2基复合材料的显微组织和力学性能[J].金属热处理, 2007, 32(6):33-36.[9] KO I Y, KANG H S, DOH J M, et al.Properties and densification of nanocrystalline MoSi2-Si3N4, comp-osite from mechanically alloyed powders by pulsed current-activated sintering[J].Journal of alloys & compounds, 2010, 502(1):L10-L13.[10] ZHANG H, WU H, GU S.Preparation and properties of MoSi2 based composites reinforced by carbon nanotubes[J].Ceramics international, 2013, 39(7):7401-7405.[11] NEWMAN A, SAMPATH S, HERMAN H.Processing and properties of MoSi2-SiC and MoSi2-Al2O3[J].Materials science & engineering A, 1999, 261(1/2):252-260.[12] 张厚安.二硅化钼及其复合材料的制备与性能[M].北京：国防工业出版社, 2007.[13] 王建栋.MoSi2/Al2O3复合材料燃烧合成与组织性能研究[D].北京：中国矿业大学, 2014.[14] ANSTIS G R, CHANTIKUL P, LAWN B R, et al.A critical evaluation of indentation techniques for measuring fracture toughness I: direct crack measurements[J].Journal of the american ceramic society, 2010, 64(9):533-538.[15] HUANG Z, ZHOU W, TANG X, et al.Effects of milling methods on the dielectric and the mechanical properties of hot-pressed sintered MoSi2/Al2O3 composites[J].Journal of alloys & compounds, 2011, 509(5):1920-1923.[16] 李文旭,宋英.陶瓷添加剂[M].北京：化学工业出版社, 2011.[17] ZHANG G J, YUE X M, WATANABE T.Synthesis of Mo(Si,Al)2 alloy by reactive hot pressing at low temperatures for a short time[J].Journal of materials science, 1999, 34(3):593-597.
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Last Update:
2019-11-25