(東北大學(xué) 材料與冶金學(xué)院，沈陽 110819)
摘 要: 以高鈦渣合成出的TiN/β′-Sialon 粉體作為原料，常壓燒結(jié)制備了TiN/β′-Sialon 復(fù)相導(dǎo)電陶瓷。利用X 射線衍射儀和掃描電鏡對材料相組成和顯微結(jié)構(gòu)進(jìn)行了表征分析，研究了材料的致密化行為、力學(xué)性能及常溫導(dǎo)電性能。結(jié)果表明：燒結(jié)產(chǎn)物主晶相為β′-Sialon和TiN。其中β′-Sialon多呈板條狀，TiN 為細(xì)小粒狀，粒度多小于0.5 μm。燒結(jié)溫度為1 530 ℃、初始原料中TiO2 加入量為35%(質(zhì)量分?jǐn)?shù))時，材料的體積密度為3.01 g/cm3，硬度為9.62 GPa，抗彎強(qiáng)度為120.07 MPa。30%TiO2 加入量是決定材料能否形成TiN導(dǎo)電網(wǎng)絡(luò)的最低TiO2加入量，此時材料的電阻率為1.3×10−2Ω·cm。
關(guān)鍵字: 高鈦渣；TiN/β′-Sialon；復(fù)相導(dǎo)電陶瓷；性能
composites from high titania slag-based mixture
（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
