Porous TiN Ceramics Fabricated by Carbothermal Reduction Method
作者单位：Xi'an Special Equipment Inspection Institute State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University
会议名称：《中国材料大会2012》
会议日期：2012年
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：supported by the National Natural Science Foundation of China (No. 50772086, 50821140308) the High-Tech R & D Program of China (863, No. 2007AA03Z558)
关 键 词：Porous TiN ceramics Carbothermal reduction Sintering additives
摘 要：Porous TiN ceramics with high porosity and uniform pore structure was prepared following the carbothermal reduction reaction between TiO2 and carbon. Influences of sintering additives and particle size of TiO2 on the microstructure and mechanical properties of porous TiN ceramics were investigated. Microstructure and mechanical properties of porous TiN ceramics were studied by XRD, SEM and three-point bending measurement. XRD analysis proved that the TiN phase has completely formed after reaction. In addition, SEM analysis showed that the resultant porous TiN ceramics were composed of fine grains with uniform pore structure. The addition of La2O3 not only accelerated the densification of porous TiN ceramics, but also decreased the porosity and increased the flexural strength. With a decrease in TiO2 particle size, the linear shrinkage increased and the porosity decreased accordingly.