Mechanical properties and microstructure of Ti(C,N) based cermets reinforced by nano-Si₃N₄ particles

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• 作者：Houan Zhang^a ; ^{ha_zhang@163.com} ; Ji-yong Yi^b ; Si-yong Gu^a
• 关键词：Titanium carbonitride based cermets ; Nano-Si₃N₄ ; Mechanical property ; Microstructure
• 刊名：International Journal of Refractory Metals and Hard Materials
• 出版年：2011
• 出版时间：March 2011
• 年：2011
• 卷：29
• 期：2
• 页码：158-162
• 全文大小：1308 K

文摘

Titanium carbonitride (Ti(C,N)) matrix cermets with different contents of nano-Si₃N₄ particles have been fabricated by microwave sintering in nitrogen atmosphere. The addition of nano-Si₃N₄ particle has important effect on the property of this cermet. Hardness and transverse rupture strength of the cermet are improved to about 1.3 % and 25.2 % , respectively, when the content of nano-particles is 2.0 % in weight. Scanning electron microscopy (SEM) in combination with energy dispersive X-ray analysis (EDX) reveals that various cermets with or without nano-Si₃N₄ present quite different morphological and structural characteristics. It may be because that the addition of nano-Si₃N₄ particles inhibits the dissolution of Ti(C,N), and promotes the dissolution of WC and Mo₂C in binder phase and the formation of the inner rim. The modified microstructure by the addition of nano-Si₃N₄ particles results in the high mechanical properties of the cermet.