Fabrication and properties of Ti(C,N) based cermets reinforced by nano-CBN particles

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• 作者：Houan Zhang^a ; ^{ha_zhang@163.com} ; Siyong Gu^a ; Jiyong Yi^b
• 关键词：B. Microstructure ; C. Mechanical property ; Titanium carbontride based cermets ; Nano-CBN
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：August, 2012
• 卷：38
• 期：6
• 页码：4587-4591
• 文件大小：858 K

摘要

Titanium carbontride (Ti(C,N)) based cermets with and without nano-cubic boron nitride (CBN) particles were prepared by microwave sintering in argon and nitrogen environment, respectively. Two kinds of core-rim microstructure, black core-grey rim and white core-grey rim, are shown in the cermets by scanning electron microscopy (SEM) in combination with energy dispersive X-ray analysis (EDX). It is found that, for the cermet with 1.5%nano-CBN particles sintered at 1500 掳C for 30 min in argon, its transverse rupture strength (TRS) and hardness are improved to about 25.9%and 1.4%, respectively. The SEM analysis shows that the inhibition effect of nano-CBN particles on the dissolution of Ti(C,N) is weakened with the increase of content of nano-CBN particles. Moreover, for the cermet sintered in argon reinforced by 1.5%nano-CBN particles, more fine black core-grey rims are found in the microstructure compared to the others. For the material sintered in nitrogen, its microstructure accompanied with many white core-grey rims in number and big black core and thin outer rim in size, results in high hardness and low TRS.