摘要
利用粉末烧结理论对比分析了机械合金化(MA)和高温自蔓延(SHS)合成的MoSi2粉末的烧结性能,并阐明了原因。结果表明:二者合成粉末的烧结性能存在较大差别,机械合金化法比高温自蔓延法至少降低了MoSi2的烧结温度约250℃。机械合金化MoSi2粉末细、晶格缺陷密度大,具有较高的活性,其烧结表观活化能仅为高温自蔓延粉末的37%,起到了显著的机械活化烧结作用。实际中采用SHS+球磨的工艺有利于在较低烧结温度获得较致密的MoSi2材料。
The sintering characteristics of MoSi2 powders synthesized by mechanical alloying(MA) and self-propagating high-temperature synthesis (SHS) were investigated. Results show that their sintering characters were very different. The sintering temperature of MoSi2 by MA is at least lower about 250degreesC than that by SHS. The powders made by MA have higher activity, with finer granules and more crystalline defects, so that the apparent activation energy for sintering value is only about 37% that by SHS in practice, it is reasonable to synthesizes MoSi2 using a combination of SHS and MA in order to attain a compact product at low sintering temperature.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2003年第1期70-72,共3页
Rare Metal Materials and Engineering
基金
国家高技术研究发展计划(863计划)资助项目(2001AA331040)
