摘要
采用Al粉和CNx前驱体粉末为原料,通过自蔓延高温合成技术,制备铝碳氮材料。利用燃烧波淬熄实验并结合XRD、SEM和EDS测试技术,研究自蔓延反应合成铝碳氮的机理。研究结果表明,自蔓延高温合成铝碳氮材料可分为3个阶段,第一阶段为Al融化和蔓流,形成的Al熔体包覆CNx前驱体粉末;第二阶段,Al与CNx分解的产物C和N2发生反应,生成AlN和Al4C3等二元相;反应放出大量的热,引发其它未反应的原料发生自蔓延反应,使反应自维持;第三阶段,AlN和Al4C3反应生成三元铝碳氮化合物。
Aluminum carbide nitride materials were fabricated by self-propagation high temperature sintering using Al and CNx powders as raw materials.And the reaction mechanism was investigated by combustion front quenching experiment combining with XRD,SEM and EDS.The results show that the process for synthesis of aluminum carbide nitride can be divided into three stages.At first,Al melts,spreads and flows,and then encapsulates the CNx precursor powders.Secondly,Al reacts with the decomposed CNx products–C and N2and forms AlN and Al4C3,releasing amounts of heat which may induce the reaction for other raw materials.At last,the AlN and Al4C3 react each other to form aluminum carbide nitride.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2012年第5期629-633,共5页
Materials Science and Engineering of Powder Metallurgy
基金
河南省基础与前沿技术研究计划项目(122300410357)
关键词
铝碳氮
自蔓延高温合成
反应机理
aluminum carbide nitride
self-propagation high temperature sintering
reaction mechanism
