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中文摘要：
将6H-SiC和a-A1203以质量比7：3混合，添加质量分数0-10％的MgO-CaO作为烧结助剂，球磨后的粉体压制成生坯，在1200℃预氧化1h后在氢气氛下常压烧结1h制备A1203．SiC复相材料。研究了烧成温度和MgO-CaO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，当烧结助剂质量分数为10％时，显气孔率降至0．1％。预氧化时，添加烧结助剂MgO．CaO，方石英和甜A1203与之反应，生成CaAl2Si2O8和Mg2Al4Si5O18，促进6H-SiC的进一步氧化。烧成过程中，CaAl2Si2O8和MgAl2O4溶解生成玻璃相促进烧结，同时a-Al2O3从玻璃相中析出，1500℃烧结试样所含物相为6H-SiC和a-Al2O3。
英文摘要：
6H-SiC and a-Al2O3 powders mixed as raw materials （mass ratio additives, Al2O3-SiC composites were prepared by pressureless sintering for 1 h body being preoxidized for 1 h at 1 200 ℃. The effects of sintering temperature properties and phase composition were investigated. Result shows that when 7：3）, adding MgO and CaO as sintering in hydrogen atmosphere after the green and MgO-CaO content on the sintering sintering temperature is 1 500 ℃, the compactness improves obviously with the increase of content of sintering addictives. With w（MgO-CaO） of 10 % added, the sample＇s apparent porosity is 0.1%. When the green body is preoxidized, CaAl2Si2O8 and Mg2A14Si5O18 are generated by the reaction of MgO-CaO with a-A1203, SiO2. During the sintering process, CaAl2Si2O8 and MgAl2O4 form liquid glass phase which promotes sintering and deposits a-Al2O3. The sample＇s crystal phases are 6H-SiC and a-A1203 at I 500 ℃.
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