共沉淀法原位合成TiB_2/B_4C陶瓷复合粉体

采用共沉淀技术,以TiCl4溶液和B4C粉末为主要原料原位合成了TiB2/B4C陶瓷复合粉体.利用TEM研究了溶液的pH值和氨水滴定速度对Ti(OH)4包覆B4C效果的影响,利用X射线衍射仪研究了合成温度对陶瓷复合粉体物相的影响,并分析了TiB2/B4C陶瓷复合粉体的合成热力学.实验结果表明:当溶液的pH值为5,氨水的滴定速度为2 mL/min时,Ti(OH)4包覆B4C效果最佳,当合成温度高于1 350℃时,可以合成出TiB2/B4C陶瓷复合粉体.

In-Situ Synthesis of TiB2/B4C Composite Ceramic Powder Through Co-Precipitation

TiB2/B4C composite ceramic powder was synthesized in situ through co-precipitation mainly with TiCl4 solution and B4C powder as raw materials. TEM was used to investigate the effects of the pH value of the solution and titration rate of NH4 (OH) on Ti(OH)4-clad B4C, while XRD was used to the effect of synthesizing temperature on the phases of the powder. And the thermodynamics of synthesis of TiB2/B4C composite powder was analyzed. The results indicated that when the pH value of the solution is 5 with a titration rate of 2 ml/min the Ti(OH)4-clad B4C is best, and the TiB2/B4C composite powder is available to be synthesized if the synthesizing temperature is higher than 1350°C.