摘要
从 AB2 型 Mo Si2 以及 A5 B3型 Mo5 Si3、 Nb5 Si3和 Ti5 Si3等几种高温结构用难熔金属硅化物的研究进展可以看出 ,Mo Si2 的改性以合金化与复合化同时进行 ,特别是基体改性与原位复合一体化 ,同时重视纳米复合以及利用各种增强剂之间的协同作用 ;A5 B3型结构硅化物以通过合金化用韧性第二相原位复合并具有较高的韧性引人注目 ,特别是掺杂 B的 Mo5 Si3不仅在高温抗氧化性方面与 Mo Si2 相当 ,而且高温蠕变特性更好。
New research adveance in the MSi2 and M5Si3(M=Mo,Nb,Ti) type refractory metallic silicides as a new class of high- temperature structural materials are overviewed,and the synergistic toughening effeet of Si C whiskers and Zr O2 particles on Mo Si2 ,according to author′s the newest research results,is exhibited.It is pointed out that combining the preparing compos- ites with alloying in Mo Si2 modification researches,in particular,combining the matrix modifica- tion with in- situ compounding together,as well as paying attention to the research on the Mo Si2 matrix nanocomposites and the synergistic effects of various reinforcements in Mo Si2 composites, are main developing research trends for improving the mechanical properties of Mo Si2 compound. Moreover,for the M5Si3type silicides the research on the two- phase Nb- Nb5Si3and Ti- Ti5Si3al- loys,and boron- doped Mo5Si3matrix materials are more spectacular.
出处
《材料工程》
EI
CAS
CSCD
北大核心
1997年第7期3-6,共4页
Journal of Materials Engineering
关键词
难熔金属硅化物
复合材料
高温结构
refrctory metal silicide composite alloying mechanical property
