Effects of addition of TiN nanoparticles on microstructure and mechanical properties of TiC based cermets

Abstract

Titanium carbide based cermets with additions of titanium nitride nanoparticles were fabricated by using ultrasonic dispersion and conventional powder metallurgy techniques. In order to characterise the microstructure, SEM and TEM have been utilised. The results show that the microstructure becomes ® ner with increasing additions of titanium nitride nanoparticles. The mechanical properties were also measured and the results show that the properties do not change monotonously with the amount of titanium nitride nanoparticle addition. Good properties can be obtained when the amount of TiN addition reaches 6 ± 8 wt-%. The improvement of properties is mainly owing to the re® nement of TiC grains as well as the de¯ection effect of titanium nitride nanoparticles on crack propagation.

Dispersion of nano-TiN powder in aqueous media

“…Niihara [4] reported that mechanical properties of ceramics could be improved by addition of nano-powder. There are several papers on the microstructure and mechanical properties of Ti(C,N)-based cermets with partial addition of nano-TiN [5][6][7][8]. The results show that the properties of cermets are controlled by the dispersion of nano-TiN reinforcements in ceramic matrix to some extent.…”

Microchemical and microstructural changes of nano-TiN powder during vacuum heat treatment

“…In 1970s, TiN was introduced into TiC-Ni-Mo cermets [2]. In 1980s, Japanese scholar Niihara [3] reported that mechanical properties of ceramics could be improved after addition of nano-powders [4][5][6][7]. From then on, nano-TiN powder was partially added into Ti(C,N)-based cermets to improve the toughness.…”

Performance of Ti(C,N)-based cermets cutter and simulation technique of cutting process

“…At present, it has been attracting much attention from researchers because of their excellent wear resistance, good high temperature hardness, perfect chemical stability, very low friction coefficient to metals, superior thermal deformation resistance (Zackrisson et al, 2001;Liu et al, 2005;Liu et al, 2002;Lindahl et al, 1993;Andrén, 2001;Mari et al, 2003;Zackrisson et al, 1996;Ahn and Kang, 2001;Chao et al, 2005;Lindahl et al, 1999). Previous works have shown that by using nano-sized starting powders, the microstructure and the mechanical property of Ti(C,N)-based cermet can cause significant changes (Liu et al, 2002;Chao et al, 2005). Moreover, it was reported that nano-sized TiN addition is more effective than micro-sized TiN in improving the mechanical properties and the cutting performance of TiC-based cermets .…”