摘要
以SiC为主要原料,以碳黑(C)为造孔剂,利用氧化物粘结法制备了SiC微孔陶瓷。研究了热处理温度和含碳量对SiC微孔陶瓷的相组成、外观形貌、体积密度、气孔率、线变化和重量变化的影响,分析了热处理过程中的物理化学变化。结果表明:随温度升高,SiC的氧化程度增大。1400℃烧后试样的表面平整,呈现出致密的粘结层;1450℃下反应剧烈,试样表面发生烧融。随含C量增加,SiC微孔陶瓷的气孔率增加,有利于O2渗入试样内部发生氧化。材料内部结构网络的构建受O2渗入量及表层SiO2生成量的控制。
SiC micro porous ceramics have been prepared by oxidation-bonding technique by using SiC powder as main material and carbon black as pore former. The phase composition, surface morphologies, buck densities, porosities, mass and linear changes of SiC have been investigated. The physical-chemical properties have been analyzed. The results indicate that the oxidation reaction of SiC aggravates with increasing temperatures. It displays undamaged surface after 1400 ℃ heat treatment, as well as fused surface after 1450 ℃ heat treatment. The latter is attributed to violent oxidation reaction. As C contents increase, the porosities grow and facilitate the infiltration of O2 into interior of SiC ceramics. The internal network microstructure is controUed by O2 infiltration and SiO2 coating.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2013年第4期743-747,共5页
Bulletin of the Chinese Ceramic Society
基金
河南工业大学高层次人才科研基金项目
关键词
SiC微孔陶瓷
氧化粘结法
含碳量
SiC porous ceramics
oxidation-bonding technique
carbon content
