(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 通過(guò)反應(yīng)燒結(jié)制備TiB2-TiC多孔復(fù)合材料。采用XRD和SEM分析該多孔復(fù)合材料的相組成和微觀結(jié)構(gòu)，并采用氣體透過(guò)法測(cè)定多孔復(fù)合材料的相對(duì)透氣系數(shù)和最大孔徑。結(jié)果表明：制備的TiB2-TiC陶瓷復(fù)合材料中存在大量的連通孔隙，隨燒結(jié)溫度的升高，燒結(jié)體的密度增大、抗彎強(qiáng)度增強(qiáng)，而孔隙度、透氣性和最大孔徑均逐漸減小；當(dāng)燒結(jié)溫度為1 700 ℃時(shí)，所制備的多孔復(fù)合材料孔隙度為30.9%，相對(duì)透氣系數(shù)達(dá)到0.7 mm/(Pa·s)，最大孔徑達(dá)到5 μm。
關(guān)鍵字: TiB2-TiC復(fù)相陶瓷；反應(yīng)燒結(jié)；孔隙度
reactive sintering
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The reactive sintering was used to synthesize the porous TiB2-TiC multiphase ceramics. The phase composition and microstructure of the porous TiB2-TiC multiphase ceramics were analyzed by XRD and SEM. The gas permeability and maximum aperture of porous ceramics were tested by gas permeation. The results show that a large number of pores exist in the prepared TiB2-TiC multiphase ceramics. With increasing sintering temperature, the density and transverse rupture strength of all the specimens increase, whereas the open porosity, maximum pore size and gas permeability decrease gradually. When the specimens are sintered at 1 700 ℃, the open porosity, gas permeability and maximum pore size of the specimens are 30.9%, 0.7 mm/(Pa∙s) and 5 μm, respectively.
Key words: TiB2-TiC multiphase ceramics; reactive sintering; porosity
