[1]李斯,张宇,周颖,等.纳米Al2O3增韧MoSi2复合陶瓷的性能及机理研究[J].郑州大学学报(工学版),2019,40(06):62-67.
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纳米Al2O3增韧MoSi2复合陶瓷的性能及机理研究()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
40
期数:
2019年06期
页码:
62-67
栏目:
出版日期:
2019-11-16

文章信息/Info

Title:
Properties and Mechanism of Nano-Al2O3 Toughened MoSi2 Composite
作者:
李斯;张宇;周颖;马成良;黄文江;吉辰
文献标志码:
A
摘要:
在实验中将不同体积分数的纳米Al2O3颗粒与Mo粉、Si粉(钼硅摩尔比为1:2)湿磨混合,通过真空反应热压烧结的方式制得MoSi2复合陶瓷,并测试其致密度、硬度以及断裂韧性等物理性质.采用XRD、SEM和EDS等手段分别对所制得的样品的物相组成、微观形貌和微区元素成分进行分析,探讨了掺入不同体积分数的纳米Al2O3颗粒对MoSi2复合陶瓷性能的影响.结果表明:(1)掺入少量纳米Al2O3能够有效改善MoSi2材料的致密度、硬度及断裂韧性.相对单一MoSi2相,掺入纳米Al2O3体积分数为20%时,致密度、硬度及断裂韧性分别提升102%、119%、167%;(2)真空反应热压烧结下,少量纳米Al2O3的掺入致使MoSi2复合陶瓷的晶体产生晶格畸变,有利于提高其断裂韧性;(3)随着纳米Al2O3加入量增多,其在MoSi2基材料中的分散性下降,导致MoSi2复合陶瓷物理性能下降.
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.
更新日期/Last Update: 2019-11-25