Study on the Thermal Shock Resistance of Si3N4/TiC Nanocomposite Ceramic Tool Materials
By adding nano Si3N4 and nano TiC particles into the micro Si3N4 matrix, the Si3N4/TiC nanocomposite ceramics were fabricated via hot pressing technique with Al2O3 and Y2O3 as sintering additives. The thermal shock resistance of Si3N4/TiC nanocomposites were investigated by means of indentation-quenching and quenching-retained strength testing methods. The results revealed that the composite containing 10 wt.% nano Si3N4 particles and 15 wt.% nano TiC nano particles was possessed of the highest thermal shock resistance, with its critical temperature difference being 700~750. The toughening and strengthening mechanisms by the nano particles addition are deem to be the essential course for the improved thermal shock resistance.
Zhejun Yuan, Xipeng Xu, Dunwen Zuo, Julong Yuan and Yingxue Yao
J. Zhao et al., "Study on the Thermal Shock Resistance of Si3N4/TiC Nanocomposite Ceramic Tool Materials ", Key Engineering Materials, Vols. 315-316, pp. 299-303, 2006