摘要
本文以碳化硅(Si C)、气相Si O2、纳米Al2O3和Al F3·H2O为原料,制备出了碳化硅/莫来石复合多孔陶瓷,主要研究了Al F3·H2O添加量、烧结温度对多孔陶瓷抗弯强度、气孔率、孔径分布等性能的影响。用SEM、XRD研究了多孔陶瓷的微观形貌和物相组成。结果表明:Al F3·H2O对莫来石的生成有明显的促进作用,1300℃时,添加Al F3·H2O的样品中检测到莫来石相,多孔陶瓷气孔率随Al F3·H2O加入量增加而升高,而抗弯强度随其增高而先增加后减小,Al F3·H2O添加量为4wt%时,多孔陶瓷气孔率为42.8%,抗弯强度为31.1 MPa。
In this paper, SiC/mullite composite porous ceramics were prepared by using SiC, vapor SiO2, nano A1203 and AlF3·H2O as the raw materials. The effects of sintering temperature and AlF3·H2O addition on the phase composition, microstructure, open porosity, pore size distribution and flexural strength were investigated. The results showed that AlF3·H2O significantly promoted the sintering process of the porous ceramics. MuUite phase was founded in samples with AlF3·H2O which were sintered at 1300 ℃. With the increasing amount of AlF3·H2O addition increased, porosity was increased and flexural strength was decreasing after increasing. At 1300 ℃ when 4wt% AlF3·H2O was added, the flexural strength of the ceramic reached 31.1 MPa with an open porosity of 42.8%.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2015年第8期2315-2319,共5页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金资助项目(50872093)
国家863项目(2012AA03A610)
关键词
多孔陶瓷
碳化硅
莫来石
氟化铝
porous ceramics
silicon carbide
mullite
aluminum fluoride
