摘要
为了研究金属材料在放电等离子烧结(SPS)过程中晶粒的长大行为和激活能的变化情况,利用SEM、FESEM、TEM等技术分析测定了纳米Cu粉坯体在SPS过程中组织形貌和晶粒尺寸的变化情况.研究表明:特定的工艺和烧结制度下,应用SPS技术可以得到均匀、致密的组织;脉冲电流的作用使晶粒表面大大活化,晶粒长大激活能大大降低,材料在迅速烧结的同时,晶粒也迅速长大.
The sintering process of nanocrystalline copper （Cu） powder compacts was investigated by spark plasma sintering （SPS）. The behavior and activation energy of the grain growth of the nano-Cu powder during SPS were analyzed. The microstructure and grain size were examined by SEM, FESEM and TEM. The results reveal that uniform and dense microstructures can be obtained under certain processing parameter conditions. It is the effect of pulsed current that improves the activity on grain surface, hence deduces the activation energy of grain growth considerably. The grain grows fast when the compacts are sintered.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2005年第5期484-487,共4页
Materials Science and Technology
基金
国家教委博士点基金资助项目(20030183067)
吉林省教育厅科研计划资助项目
吉林大学'985工程'汽车工程科技创新平台资助项目
关键词
放电等离子烧结
纳米Cu粉末
晶粒生长
激活能
spark plasma sintering
nanocrystalline Cu powder
grain growth
active energy
