【摘要】 以微米TiN和α-Al2O3粉体为原料,采用无水乙醇为溶剂湿法球磨制备了TiN-Al2O3复合粉体,在氮气气氛中通过无压烧结得到TiN-Al2O3复合材料。研究了TiN含量对TiN-Al2O3复合材料导电性能的影响,实验结果表明:TiN-Al2O3复合材料的导电性能符合渗流理论,材料的电阻率取决于导电添加剂TiN的含量,TiN含量的增加能明显降低Al2O3复合材料的电阻率,在实验粒度配比下,其渗流阀值Vc为20.30%~22.13%。更多还原

【Abstract】 TiN-Al2O3 powders were prepared by wet ball milling with micrometer TiN,Al2O3 powder and alcohol as starting materials.The sintered bodies were prepared by pressureless sintering process in the nitrogen atmosphere.The influences of TiN content on the electrical conductivity of TiN-Al2O3composites were studied.Experimental results show that electric conductivity of TiN-Al2O3multiphase ceramics is consistent with the percolation model.The electrical resistivity of the Composites mainly depends on the content of TiN.The addition of TiN could dramatically reduce the electrical resistivity of Al2O3 matrix.In this test the critical percent content of TiN is 20.30%～22.13% when the raw material granularity scale is related to this paper.更多还原