掺镁对纳米碳化钛制备的影响  

Influence of Magnesium Addition on Preparation of Nano-TiC Powder

作　　者：郑卓[1] 周大利[1] 喻冲[1] 胡驰[1] 赵鑫[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610064

出　　处：《钢铁钒钛》2012年第2期20-25,共6页Iron Steel Vanadium Titanium

摘　　要：以钛酸四丁酯和酚醛树脂分别作钛源和碳源,采用溶胶-凝胶法制备TiC前驱体,以Mg粉作为促进剂,用碳热还原法制备纳米TiC。采用XRD和SEM对样品的物相和形貌进行表征。结果表明:TiC前驱体直接碳热还原温度在1 380℃才能得到纯的纳米TiC粉末,而添加Mg粉并随着Mg粉加入量的增加可以显著降低碳热还原温度,在碳热还原温度为1 200℃时就可以合成纯的纳米TiC粉末,并可以降低反应物配料中碳源的比例和抑制产物TiC颗粒的长大,制得的TiC粉末粒度均匀,颗粒径为50～100 nm。In the experiment, TiC precursor was produced by sol-gel process using Ti（ C4 H9 O）4 and phenolic resin as titanium source and carbon source respectively. Then the so prepared TiC precursor was mixed with the catalyst of Mg powder to produce nano - TiC powder by carbothermic reduction process. The phase and morphology of samples were characterized by XRD and SEM. Generally, pure TiC powder can only be prepared from TiC precursor at 1 380℃ by carbothermic reduction process, but the test results indicate that as Mg powder is added and increased, the temperature of carbothermic reduction process can dramatically be lowered, so pure TiC powder can be produced at 1 200 ℃. The addition of Mg powder also reduces the proportion of carbon source in the reactants and restrains the growth of TiC grain. Thus, granularity of the TiC powder is uniform with the grain diameter around 50 - 100 nm.

关 键 词：溶胶-凝胶 纳米碳化钛 碳热还原反应 酚醛树脂 

分 类 号：TB383.1[一般工业技术—材料科学与工程]