原料表面改性对微波合成TiC粉体的影响  

Effects of Surface Modification of Raw Materials on Microwave Synthesis of Nano-Ti C Powders

作　　者：王国龙[1] 刘艳春 任雪潭[1] 滕元成[1] 

机构地区：[1]四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,西南科技大学,绵阳621010 [2]广州市红日燃具有限公司,广州510455

出　　处：《中国陶瓷》2016年第4期12-15,共4页China Ceramics

基　　金：国家高技术研究发展计划(863计划)(2013AA032001);国家自然科学基金(11275158);国家级大学生创新创业训练计划资助项目(201410619010)

摘　　要：通过调节p H值和添加分散剂(聚丙烯酸),对微波合成Ti C的原料Ti O2和乙炔炭黑进行表面改性处理,将处理后的原料通过湿磨混料,并在微波窑中利用碳热还原反应合成Ti C粉体。利用Zeta电位测试、X射线衍射、激光粒度分析等手段,研究p H值、分散剂、球磨等原料表面改性及混料工艺对微波合成Ti C粉体的物相组成、化学计量、粒度分布的影响。结果表明:Ti O2和乙炔炭黑的较佳改性p H值均为4,其较佳分散剂用量分别是2.4 wt%和9.0 wt%;湿磨混料的较佳时间为6 h;与未经表面改性处理相比,原料经表面改性处理后,微波合成Ti C粉体的温度较低(合成温度降低150℃),粉体粒度较小,化学计量更准确。The raw materials of Ti O2 and acetylene carbon black used to synthesize Ti C were modified by means of adjusting p H values and adding dispersant（polyacrylic acid）. The treated raw materials were blended by wet milling. The Ti C was synthesized by carbothermal reduction in microwave oven. The Zeta potential measurements, X-Ray Diffraction and laser particle-size distribution were used to analyze the effect of surface modification（p H, dispersant） and milling process on the phase, stoichiometry and particle size distribution of the prepared Ti C powders. The results show that the optimum modified p H value of Ti O2 or carbon black was 4 and the optimum dosage of dispersant was 2.4wt% or 9.0 wt%, respectively. The optimum time of wet milling was 6 h. Compared with the Ti C powders prepared by raw materials without surface modification, the synthetic temperature becomes lower（reduced by 150 ℃） after surface modification, the particle size becomes smaller and the stoichiometry is more accurate.

关 键 词：表面改性 合成温度 化学计量 粒度分布 

分 类 号：O614.411[理学—无机化学]