碳热还原法制备超细ZrB_2/SiC复合陶瓷粉  

Preparation of Ultra-fine ZrB_2/SiC Composite Ceramic Powders by Carbothermal Reduction

作　　者：施浩良[1] 肖汉宁[1] 高朋召[1] 胡继林[1] 李青[1] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082

出　　处：《机械工程材料》2011年第9期93-97,共5页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(50972042)

摘　　要：以ZrO_2、硼酸、硅溶胶和炭黑为原料于1300～1700℃用碳热还原法合成了超细ZrB_2/SiC复合陶瓷粉;用XRD和SEM等研究了合成温度、反应物配比等对复合粉体物相组成、微观形貌和粒径的影响。结果表明:当原料中硼酸过量(ZrO_2与B_2O_3物质的量比为1:1.5)才能保证在1650℃下保温1h时碳热还原反应完全进行,得到高纯的ZrB_2/SiC复合陶瓷粉体,其颗粒平均尺寸为0.4μm;不同温度制备的复合粉体颗粒形貌不同,随着温度的升高,晶须和棒状颗粒减少,而球形颗粒增多。Ultra-fine ZrB2/SiC composite ceramic powders were synthesized at temperatures from 1 300 ℃ to 1 700 ℃ by carbothermal reduction using zirconium dioxide, boric acid, silica sol and carbon black as raw materials. The influences of synthesis temperature and reactant ratio on the phase composition, micro morphology and particle size of the composite powders were investigated by XRD and SEM. The results show that the completeness of carbothermal reduction for the synthesis of high purity ZrB2/SiC composite powders was needed of over dosage of boric acid （molar ratio of ZrO2 and B2O3 was 1 ： 1. 5） when synthesized at 1 650 ℃ for 1 h. The composite powders had an average particle size of 0. 4μm, and different particle shapes after prepared at different temperatures. With the increase of synthesis temperature, the whisker and rod particles gradually reduced while ball particles increased.

关 键 词：SIC ZRB2 复合粉 碳热还原法 

分 类 号：TB32[一般工业技术—材料科学与工程]