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中文摘要：
将6H-SiC和α-Al2O3按质量比为7：3混合,添加0～10%的[BaO＋TiO2]作为烧结助剂,球磨后的均匀粉体压制成生坯,在1 200℃预氧化1 h后在氢气气氛下常压烧结1h制备SiC-莫来石复相材料。研究了烧成温度和BaO–TiO2含量对该复相材料烧结性能和相组成的影响。结果表明：1500℃下,随着烧结助剂含量的增加,烧结致密性明显提高,当含量（质量分数）达到8%时,获得显气孔率为0.17%的致密复相材料。预氧化时,烧结助剂中的BaO与α-Al2O3及SiC氧化生成的方石英反应,生成钡长石BaAl2Si2O8,烧成过程中,钡长石转化成玻璃相,促进莫来石的生成,同时促进烧结。复相材料主晶相为6H-SiC和莫来石,次相为玻璃相和Al2SiO5。
英文摘要：
6H-SiC and α-Al2O3 powders were mixed as raw materials （in mass ratio of 7：3） with BaO and TiO2 as sintering additives. The SiC-mullite composites were prepared via pressureless sintering in hydrogen atmosphere for 1 h after the green body was pre-oxidated at 1 200 ℃ for 1 h. The effects of sintering temperature and BaO–TiO2 content on the sintering properties and phase composition were investigated. The results show that the compactness improves obviously with the increase of sintering additives at sintering temperature of 1 500 ℃. The apparent porosity of the sample was 0.17% at BaO–TiO2 additive of 8% （mass fraction）. BaAl2Si2O8 was generated via the reaction of BaO, α-Al2O3 and SiO2 when the green body was pre-oxidated. During the sintering process, BaAl2Si2O8 formed a liquid glass phase, which could promote sintering and the formation of mullite. The main crystal phase of the sample was 6H-SiC and mullite, and the minor phase was glass phase and Al2SiO5.
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