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热处理温度对MgO---MgAl2O4---ZrO2共晶材料力学性能的影响

DOI: 10.7521/j.issn.0454-5648.2014.03.17

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Abstract:

以分析纯的MgO、活性α--Al2O3、电熔单斜ZrO2和电熔镁砂为原料,研究了热处理温度对MgO--MgAl2O4--ZrO2共晶材料力学性能和热震稳定性的影响。结果表明随热处理温度从1650℃提高到1740℃,MgO--MgAl2O4--ZrO2共晶体的生成比例逐渐增加,材料断裂韧性、断裂表面能、高温抗折强度和抗热震稳定性逐渐提高。经过1740℃热处理后,MgO--MgAl2O4--ZrO2共晶材料的力学性能明显改善,其断裂韧性、断裂表面能、高温抗折强度分别为MgO--Al2O4--ZrO2非共晶材料的1.65倍、2.04倍、5.91倍,MgO--ZrO2材料的1.49倍、1.72倍、2.22倍。MgO--MgAl2O4--ZrO2共晶材料因能吸收裂纹并阻止裂纹扩展而具备优异的抗热震稳定性能,其抗热震稳定性参数Rst值和R′′′′值分别为MgO--MgAl2O4--ZrO2非共晶材料的1.29倍、1.81倍,MgO--ZrO2材料的1.50倍、3.29倍。

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