中文摘要：

以高钛渣为主要原料经碳热还原氮化法合成出廉价的TiN／O’-Sialon粉体作为原料，常压下烧结制备了TiN／O＇-Sialon导电复合材料，利用XRD和SEM对其相组成和显微结构进行了表征，研究了初始原料中TiO2加入量对材料的致密化、力学性能及常温导电性能的影响．结果表明：烧结产物由O＇-Sialon和TiN组成．O＇-Sialon大多呈等轴状，粒度约1—3μm．TiN为细小粒状，粒度多小于0．5μm．初始原料中TiO2加入量为30％的材料，其体积密度为3．1g／cm^3，硬度为9．2GPa，抗弯强度为169MPa．25％左右的TiO2加入量是决定材料中TiN能否形成导电网络的最低TiO2加入量，此时材料的电阻率为1．8×10^-2Ω·cm．

英文摘要：

TiN/O＇ -Sialon electroconductive composites were fabricated by pressureless sintering from TiN/O＇-Sialon powder as the chief raw material which was synthesized by the carbothermal reduction nitridation method using high titania slag. Phase constitute and microstructure were analyzed by XRD and SEM. The effect of TiO2 content in initial raw materials on densification, mechanical properties and electrical conductivity were studied. The results show that the sintered samples consist of O＇-Sialon and TiN. O＇-Sialon exhibits equiaxied morphology and the particle sizes are about 1-3μm. TiN shows fine granular morphology and most of the particle have lower size than 0.5/μm. For the composite samples sintered at 1773 K using raw materials containing 30%TiO2, bulk density, hardness and flexure strength are 3.1 g/cm^3, 9.2 GPa and 169 MPa, respectively. The minimum amount of TiO2 in initial raw materials is 25% for the formation of electroconductive network in the composites, of which the electric resistivity is 1.8×10^-2Ω.cm.