摘要
以合成堇青石（≤0.074 mm）和合成莫来石（0.45-0.9 mm）为主要原料,α-Al2O3微粉（≤0.044 mm）、镁砂（≤0.054 mm）和熔融石英（≤0.054 mm）为添加剂,经细磨、造粒、成型后,于1 370℃4 h烧成后制备了莫来石质量分数分别为15%、20%、25%、30%、35%和40%的堇青石-莫来石复相陶瓷材料,研究了莫来石含量对复相陶瓷材料烧结性能、抗折强度、热膨胀性及抗热震性的影响。结果表明：随着莫来石含量的增加,堇青石-莫来石复相陶瓷材料的体积密度、显气孔率和热膨胀系数都呈上升趋势,而抗折强度呈降低趋势;适当提高莫来石含量有利于复相陶瓷材料的抗热震性,当莫来石含量达到30%时,材料的抗热震性最好。
Cordierite-mullite multiphase ceramic materials were prepared using synthesized cordierite powder and synthesized mullite particles as main starting materials and Al2O3 micropowder （ ≤0.044 mm）, magnesia （ ≤0.054 mm） and fused silica （ ≤0.054 mm） as additives. After fine grinding, granulating and shaping, the multiphase ceramic specimens containing 15%, 20%, 25%, 30%, 35% and 40% of mullite were obtained at 1 370 ℃ for 4 h. The effects of mullite content on the sintering property, MOR, thermal expansion and thermal shock resistance were studied. The results showed that as the content of mullite increasing, the bulk density, apparent porosity and thermal expansion coefficient of the multiphase ceramic material increased, while the MOR decreased. It was favorable to enhance the thermal shock resistance of the multi- phase ceramic material by increasing the mullite content appropriately. With 30% mullite, the cordierite - mullite multiphase ceramics had the best thermal shock resistance.
出处
《耐火材料》
CAS
北大核心
2008年第5期365-367,共3页
Refractories
关键词
莫来石
堇青石
复相陶瓷
抗热震性
Mullite, Cordierite, Multiphase ceramics, Thermal shock resistance
