摘要
以液相复合-连续还原碳化方法制备的纳米WC-10Co(以质量计)复合粉末为原料，选择VC和Cr_3C_2作为超细WC-10Co硬质合金晶粒生长抑制剂，研究晶粒生长抑制剂加入量对超细WC-10Co硬质合金组织、晶粒和性能的影响。实验结果表明：超细WC-10Co硬质合金中WC晶粒度随着晶粒生长抑制剂加入量的增加而减小，纳米WC-10Co复合粉中加入0.4％VC和0.4％Cr_3C_2(以质量计)晶粒生长抑制剂，经1 380℃真空烧结60min，1 320℃低压处理30min后，可以得到平均晶粒度380 nm、断裂强度3.55 GPa和Rockwell A硬度92.6综合性能较好的超细WC-10Co硬质合金。过多添加晶粒生长抑制剂反而降低了超细WC-10Co硬质合金的性能。
Nano-crystalline WC-10Co (in mass) composite powders were prepared by spray thermal decomposition continuous reduction and carbonization technology. Influences of VC and Cr3C2 growth inhibitor on microstructure, grain size and properties were investigated. Results show that the grain size decreases with the increase of amount of grain growth inhibitors. When 0.4% VC and 0.4% Cr3C2 (in mass) grain growth inhibitors are added in nano-crystalline WC-10Co composite powders, the ultrafine WC-10Co cemented carbide with average grain size of about 380 nm, transverse rupture strength (TRS) of 3.55 GPa and Rockwell A hardness of 92.6 is obtained by sintering at 1380°C for 60 min and treating at low pressure and 1320°C for 30 min. But the excessive adding of grain growth inhibitors will decrease the properties of ultrafine WC-10Co cemented carbides.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第12期1511-1514,1533,共5页
Journal of The Chinese Ceramic Society
基金
中国博士后科学基金(2003034504)武汉理工大学材料复合新技术国家重点实验室开放基金国家863纳米材料专项(2002AA302504)资助项目
关键词
纳米粉未
碳化钨-钴
复合粉末
超细硬质合金
晶粒生长抑制剂
Carbonization
Cobalt alloys
Crystalline materials
Grain growth
Nanostructured materials
Pyrolysis
Sintering
Tungsten carbide
