用以高钛渣为主要原料经碳热还原氮化法合成出的廉价TiN/O′-Sialon粉体作为原料，常压烧结制备了TiN/O′-Sialon导电复合材料，利用X射线衍射仪和扫描电镜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：烧结产物相为O′-Sialon和TiN。O′-Sialon大多呈等轴状，粒度约1~3mm。TiN为细小粒状，粒度多小于0.5mm。初始原料中TiO2加入量为30wt%的材料的体积密度为3.1g/cm3，硬度为9.2GPa，抗折强度为169MPa。25wt%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。
The TiN/O′-Sialon electroconductive composite were fabricated by pressureless sintering from TiN/O′-Sialon powder that was synthesized by the carbothermal reduction nitridation method using high titania slag as the chief raw material. Phase assembly and microstructure were analyzed by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The effect of TiO2 content in initial raw materials on densification, mechanical properties and electrical conductivity were studied. The results show that O′-Sialon and TiN exist in the sintered samples. The O′-Sialon grains exhibit equiaxied morphology and the grain size is about 1~3mm. The TiN particles show fine granular morphology, with most of the grains lower than 0.5mm in size. For the composite samples sintered at 1500℃ using raw materials containing 30wt%TiO2, bulk density, hardness and flexure strength is 3.1g/cm3, 9.2GPa and 169MPa, respectively. The minimum amount of TiO2 in initial raw materials is 25wt% for the formation of electroconductive network in the composites. The electric resistivity of such a composite is 1.8×10-2Ω·cm.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%