LU Yuan, GONG Nan, JING Qiangzheng, LI Jingjing, YUN Ke

(Xi’an Special Equipment Inspection Institute, Xi'an 710065, Shanxi, China)

Abstract: Porous TiN ceramics with high porosity and uniform pore structure was prepared by carbothermal reduction reaction between TiO₂ and carbon. The influences of sintering additives, TiO₂ particle size and sintering temperature on the microstructure and mechanical properties of porous TiN ceramics were investigated. XRD analysis proved the formation of only TiN during the high-temperature sintering. SEM analysis showed that the resultant porous TiN ceramics was composed of small equiaxed grains and uniformly-distributed pores. The porous TiN ceramics sintered at 1600 ℃ showed higher porosity with the addition of Lu₂O₃ as a sintering additive and TiO₂(D50 = 10μm) as a starting material.

Key words: carbothermal reduction; porous TiN ceramics; porosity