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中南大学学报(自然科学版)

Journal of Central South University

第35卷    第5期    总第159期    2004年10月

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文章编号:1672-7207(2004)05-0725-06
金属添加方式对NiFe基/NiFe2O4
金属陶瓷微观组织的影响
黄伯云,周 涛,李宇春,李志友,周科朝

(中南大学粉末冶金国家重点实验室,湖南长沙,410083)

摘 要: 采用模压真空烧结法制备了2种金属陶瓷。差热分析、X射线衍射和扫描电镜结果表明:金属相加入方式对陶瓷的结构和组成有较大影响;当Al以单质形式加入时,Al会完全改变NiFe2O4原有尖晶石相,形成新尖晶石相,同时,这种加入方式会导致金属各元素的局部分布不均匀;当Al以合金化形式加入时,由于合金化后Al的扩散得到了较好地控制,没有改变原有陶瓷成分。2种金属陶瓷中的陶瓷相在高温烧结中都不稳定,都出现了离解现象。

 

关键字: 金属陶瓷;尖晶石;离解;合金化

Effect of Metal-adding Method on Microstructure
of NiFe Base/ NiFe2O4 Cermet
HUANG Bai-yun,ZHOU Tao,LI Yun-chun,LI Zhi-you,ZHOU Ke-chao

Key State Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Abstract:Two kinds of cermet were prepared by vacuum sintering after die pressing. After being analyzed by differential thermogravity analysis(DTA), X-ray and scanning electron microscope(SEM), it is found that the form of adding metals has great effects on the microstructure and composition of ceramics. When Al is added as simple substance, the composition of ceramics is completely changed and a new spinal ferrite is formed. In the meantime, it led to nonuniform distribution of the elements in sample. When Al alloyed is added, the immigration of Al alloyed could be well controlled and the primitive ceramic isn t changed. The ceramic in two kind of cerments is unstable during sintering because the ceramic disassociates at elevated temperature.

 

Key words: cermet; spinal;dissociation; alloyed

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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