掺镁对纳米碳化钛制备的影响

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1380℃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...

Influence of Magnesium Addition on Preparation of Nano-TiC Powder

In the experiment,TiC precursor was produced by sol-gel process using Ti(C4H9O)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.