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Oxidation behavior of a pressureless sintered ZrB_2-MoSi_2 ceramic composite

机译:无压烧结ZrB_2-MoSi_2陶瓷复合材料的氧化行为

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摘要

Ultra-refractory ceramic composites of composition ZrB_2 + (5 to 20) vol percent MoSi_2 were produced by pressureless sintering at 1830 deg C under argon atmosphere. Sintering cycles and microstructural analysis point out that at least 20 vol percent molybdenum disilicide is necessary for obtaining a dense material. Thereafter, the composite 80 vol percent ZrB_2 + 20 vol percent MoSi_2 was used to test the thermal stability under oxidizing environment. Oxidation tests were carried out in flowing synthetic air in a thermogravimetric analyzer from 700 to 1400 deg C with exposure time of 30 h. In the low-temperature range (700-1000 deg C), the oxidation of the composite resembles that of monolithic ZrB_2 ceramics, for temperatures >1200 deg C the silica resulting from oxidation of molybdenum disilicide seals the sample surface, preventing zirconium diboride from fast degradation.
机译:通过在氩气氛下在1830℃下进行无压烧结来制备组成为ZrB_2 +(5至20)vol%MoSi_2的超耐火陶瓷复合材料。烧结循环和微观结构分析指出,至少需要有20%(体积)的二硅化钼才能获得致密的材料。之后,使用80vol%的ZrB_2 + 20vol%的MoSi_2的复合材料测试氧化环境下的热稳定性。氧化试验是在流动的合成空气中于700至1400℃的热重分析仪中进行的,暴露时间为30小时。在低温范围(700-1000摄氏度)下,复合材料的氧化类似于单片ZrB_2陶瓷的氧化,对于温度> 1200摄氏度,二硅化钼氧化产生的二氧化硅会密封样品表面,从而阻止二硼化锆快速固化降解。

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