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中南大学学报(自然科学版)

Journal of Central South University

第31卷    第1期    总第131期    2000年2月

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文章编号:1004-0609(2000)01-0037-06
掺碳碳化硼活化烧结及其动力学
王零森,杨义斌,张金生,樊    毅,吴     芳

(中南工业大学 粉末冶金研究所,长沙 410083)

摘 要: 研究了在中位径为0.42 μm的碳化硼微粉中添加1%~4%碳为活化剂的烧结过程。研究了烧结坯的密度、抗弯强度、晶粒度与掺碳量、烧结温度、保温时间的关系。在一定烧结温度以上,少量碳的掺入明显提高了烧结活性,烧结坯密度明显提高,在本实验条件下,最佳掺碳量为1%~2%,最佳烧结温度为2 160~2200℃。研究了掺碳碳化硼烧结动力学,得出其物质迁移机制主要为晶界扩散。最后研究了其相组成,掺入的碳除溶解于碳化硼外,以游离碳形式存在,没有新相生成。

 

关键字: 碳化硼;活化烧结;烧结动力学

Activated sintering and sintering kinetics of boron carbide with carbon as activator
WANG Ling-sen, YANG Yi-bing, ZHANG Jin-sheng, FAN Yi, WU Fang

Research Institute for Powder Metallurgy, Central South University of Technology, Changsha 410083, P. R.China

Abstract:The activated sintering processes of boron carbide with 1%~4% carbon as activator were studied. The mean size of boron carbide ultrafine powder was 0.42μm. The relationships between the density, bending strength and grain size of the sintered compact and the quantity of additives, sintering temperature, sintering time were investigated . It was showed that the density of the sintered compact increased even with the addition of little amount of additive(carbon). The optimum amount of the additive (carbon) is 1%~2%, and the optimum sintering temperature is 2 160~2 200 ℃. The activated sintering kinetics of boron carbide with carbon as activator were also researched, the results showed that the main transport mechanism was grain boundary diffusion. Finally, the constitution of carbon phase was studied, it was showed that the form of the added carbon after sintering was free carbon besides those dissolved in boron carbide, and no new phase was formed.

 

Key words: boron carbide; activated sintering; sintering kinetics

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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