Mechanical properties and microstructure of Ti(C, N) based cermet cutting tool materials fabricated by microwave sintering

详细信息    查看全文

• 作者：Hanpeng Hu ; Yu Cheng ; ^{chengyu106@mail.njust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zengbin Yin ; Yong Zhang ; Taiyi Lu
• 关键词：C. Mechanical properties ; Microwave sintering ; Microstructure ; Ti(C ; N) based cermet
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：15017-15023
• 全文大小：2127 K

文摘

A type of Ti(C, N) based cermet cutting tool materials was fabricated by microwave sintering. The effects of metal content and sintering temperature on the mechanical properties and microstructure were thoroughly investigated. The experimental results showed that sufficient metal liquid phase can significantly improve densification and fracture toughness of cermet. However, high metal content, on one hand, reduced the hardness of cermets, and on the other resulted in the micro-defects of materials. The activate mechanisms of microwave can lower the temperature required for the metal liquid phase formation and enable the densification of cermet at low temperatures without external pressure. But low sintering temperature suppressed the flow of metal liquid phase which caused the pores among the grains cannot be fully filled. High temperature may lead to the coarsening of the particles and the decreasing of mechanical properties. A Ti(C, N) based cermet cutting tool material with 15% Co–Ni content which was sintered at 1550 °C for 10 min exhibited the optimum mechanical properties. Its hardness and fracture toughness were 15.49±0.21 GPa and 10±0.55 MPa m^1/2 respectively.