Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第21卷    第11期    总第152期    2011年11月

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文章编号:1004-0609(2011)11-2863-06
高钛渣制备TiN/β′-Sialon 复相导电陶瓷及其性能
姜 涛, 薛向欣, 李 江, 段培宁

(东北大学 材料与冶金学院,沈阳 110819)

摘 要: 以高钛渣合成出的TiN/β′-Sialon 粉体作为原料,常压烧结制备了TiN/β′-Sialon 复相导电陶瓷。利用X 射线衍射仪和扫描电镜对材料相组成和显微结构进行了表征分析,研究了材料的致密化行为、力学性能及常温导电性能。结果表明:烧结产物主晶相为β′-Sialon和TiN。其中β′-Sialon多呈板条状,TiN 为细小粒状,粒度多小于0.5 μm。烧结温度为1 530 ℃、初始原料中TiO2 加入量为35%(质量分数)时,材料的体积密度为3.01 g/cm3,硬度为9.62 GPa,抗弯强度为120.07 MPa。30%TiO2 加入量是决定材料能否形成TiN导电网络的最低TiO2加入量,此时材料的电阻率为1.3×10−2Ω·cm。

 

关键字: 高钛渣;TiN/β′-Sialon;复相导电陶瓷;性能

Fabrication and properties of TiN/β′-Sialon electroconductive
composites from high titania slag-based mixture
JIANG Tao, XUE Xiang-xin, LI Jiang, DUAN Pei-ning

School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China

Abstract:The TiN/β′-Sialon electroconductive composites were fabricated by pressureless sintering from TiN/β′-Sialon powder that was synthesized by the carbothermal reduction nitridation method using high titania slag as the starting material. The phase assembly and microstructure were analyzed by XRD and SEM. The densification, mechanical properties and electrical conductivity of TiN/β′-Sialon were studied. The results show that β′-Sialon and TiN exist in the sintered samples. β′-Sialon grains exhibit lath-shaped morphology and TiN particles show fine granular morphology, most of the grains have lower size than 0.5 μm. For the samples sintered at 1 530 ℃ using raw materials containing 35%TiO2 (mass fraction), the bulk density, hardness and flexure strength are 3.01 g/cm3, 9.62 GPa and 120.07 MPa, respectively. The minimum amount of TiO2 in the initial raw materials is 30% for the formation of electroconductive network in the composites. The electric resistivity of such a composite is 1.3×10−2 Ω·cm.

 

Key words: high titania slag; TiN/β′-Sialon; multiphase electroconductive ceramics; properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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