论文部分内容阅读
利用ＸＲＤ、ＳＥＭ、ＥＰＭＡ和ＨＲＥＭ等测试技术系统地研究了Ｙ２Ｏ３－ＳｉＯ２添加剂对ＡｌＮ／ＳｉＣＷ复合材料力学性能及高温抗氧化性能的影响。结果表明：Ｙ２Ｏ３－ＳｉＯ２添加剂可有效地改善材料的力学性能，材料的氧化过程也是其热处理增强过程。添加剂组成接近其低共熔点时，材料随氧化时间的延长而得到增强增韧，且增幅最大，其最佳掺量为１０ｗｔ％。氧化处理改变了粒界玻璃相的相组成，玻璃相与ＡｌＮ颗粒发生作用，生成ＡｌＮ多形体２ＨδＳｉａｌｏｎ相，形成对材料有益的空间交错的结构。
The effects of Y2O3-SiO2 additive on the mechanical properties and high temperature oxidation resistance of AlN / SiCW composites were investigated systematically by XRD, SEM, EPMA and HREM. The results show that the Y2O3-SiO2 additive can effectively improve the mechanical properties of the material, and the oxidation process of the material is also the heat treatment enhancement process. When the composition of the additive is close to its eutectic point, the material is enhanced and toughened with the prolongation of the oxidation time, and the maximum increase is achieved. The optimum dosage is 10wt%. Oxidation changes the phase composition of the grain boundary glass phase, and the glass phase interacts with AlN particles to form the AlN polymorph 2HδSialon phase, forming a space-staggered structure that is beneficial to the material.