Microstructure and properties of ultra-fine TiC0.7N0.3 cermet

✍ Scribed by Ji Xiong; Zhixing Guo; Bin Wen; Cong Li; Baoluo Shen

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 826 KB
• Volume: 416
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2005.08.060

✦ Synopsis

Ti(C, N) based cermet with an average particle size less than 0.5 m is fabricated by using ultra-fine TiC 0.7 N 0.3 with average particle size less than 0.2 m. Cermets made up of ultra-fine TiC 0.7 N 0.3 powders have higher hardness and strength than those of conventional powders. In order to find out the reason for the hardness and strength increase, XRD, SEM, EPMA and TEM are employed to observe the microstructures of the two cermets. The results show that the two cermets have the same constituent phases, namely TiC 0.7 N 0.3 , (Ti, Mo, Ta, W) (C, N) and solid solution Co(Ni). Solid solution (Ti, Mo, Ta, W) (C, N) is the hard phase and solid solution Co(Ni) is the binder phase. The core-rim microstructure is the result of alloy elements distributing in the outer part of Ti(C, N) particles during the process of diffusion. There are dislocations and twin crystals in solid solution (Ti, Mo, Ta, W) (C, N), and a kind of precipitation phase appears in solid solution Co(Ni) which is unknown, rather fine and coherent with Co(Ni) matrix.