MoSi_2-WSi_2复合体系的自蔓延燃烧合成  

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

作　　者：寇开昌[1] 杨延清[1] 艾云龙[1] 陈彦[1] 康沫狂[1] 

机构地区：[1]西北工业大学材料科学与工程学院,西安710072

出　　处：《稀有金属材料与工程》2000年第3期190-192,共3页Rare Metal Materials and Engineering

摘　　要：利用自蔓延燃烧合成法制备了 Mo Si2 - WSi2 复合粉体 ,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 Mo Si2 与 WSi2 的复合 ,又可通过调整反应物 Mo,W,Si的比例 ,在 Mo Si2 中引入 WSi2的同时还能引入足够量的 Mo5 Si3- W5 Si3相。W量的增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 Mo Si2 - WSi2 和 Mo5 Si3- W5 Si3均以固溶体的形式存在。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.

关 键 词：自蔓延燃烧合成 MoSi2-WSi2 绝热温度 

分 类 号：TB39[一般工业技术—材料科学与工程]