MoSi2—WSi2复合体系的自蔓延燃烧合成

自蔓延燃烧合成法制备了ＭｏＳｉ２－ＷＳｉ２ 事粉体，并对合成产物进行了Ｘ射线衍射分析。研究表明，通过自蔓延燃烧合成反应既可实现ＭｏＳｉ２与ＷＳｉ２的复合，又可通过调整尖物Ｍｏ，Ｗ，Ｓｕｉ的比例，在ＭｏＳｉ２中引入ＷＳｉ２的同时还能引入足够量的Ｍｏ５Ｓｉ３－Ｗ５Ｓｉ３相。Ｗ量的境加使体系的绝热温度降低，对自蔓延燃烧合成反应产生影响，研究还表明ＭｏＳｉ２－ＷＳｉ２和Ｍｏ５Ｓｉ３－Ｗ５Ｓｉ３均以固溶体的

Self-Propagating High-Temperature Combustion Synthesis of MoSi_2-WSi_2 Composite

MoSi 2 WSi 2 powders have been synthesized by means of self propagating high temperature combustion. It was found that not only MoSi 2 WSi 2 but also Mo 5Si 3 W 5Si 3 can be synthesized by this method when suitable ratios of Mo, W and Si powders were used. As the W content increases, the adiabatic temperature of reactive system decreases, which influences the synthesis process. It is also confirmed that MoSi 2 WSi 2 and Mo 5Si 3 W 5Si 3 exist as solid solutions of Mo (1-x) ,W x]Si 2 and Mo (1-y) ,W y] 5Si 3, respectively.