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本文旨在研究Al_2O_3-SiO_2,系多晶耐火纤维在加热过程中的品质劣化过程,为合理选择和使用这类新材料提供技术依据。为此,作者自制了Al_2O_3-SiO_2系三种典型的含Al_2O_3分别为72％、80％和95％的多晶纤维,并对它们在加热过程中的收缩、荷重收缩、抗震未粉率、矿相和显微结构等发生的变化进行了研究。结果认为Al_2O_3-SiO_2系多晶纤维的热退化过程是起始于1400℃以后的晶粒缓慢长大,剧烈退化发生在1500℃以后的晶粒急剧长大过程,退化结束于1600℃,在此温度,晶粒长大到足以使强度接近完全丧失的程度。据此推定出三种纤维中的Al_2O_3含量72％的莫来石纤维的安全连续使用温度为≤1500℃;Al_2O_3含量为80％和95％的氧化铝纤维为≤1400℃。
The purpose of this paper is to study the quality degradation of Al 2 O 3 -SiO 2 and polycrystalline refractory fiber during heating process and provide the technical basis for the rational selection and use of these new materials. For this reason, the author prepared three kinds of typical Al 2 O 3 -SiO 2 -type polycrystalline fibers containing 72%, 80% and 95% Al 2 O 3 respectively, and studied their shrinkage, load-shrinkage, Phase and microstructure changes have been studied. The results show that the thermal degradation of Al_2O_3-SiO_2 polycrystalline fibers is that the grains grow slowly after 1400 ℃, and the sharp degeneration occurs after 1500 ℃. The degradation of the grains ends up at 1600 ℃, Temperature, grain growth is large enough to make the intensity almost completely lost. Based on this, the safe continuous use temperature of mullite fiber with 72% Al 2 O 3 content in three kinds of fibers is ≤1500 ℃, and the alumina fibers with Al_2O_3 content of 80% and 95% are ≤1400 ℃.