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Morphology Evolution of Industrial Alumina Powder after Firing at Different Temperatures

机译:工业氧化铝粉在不同温度下烧成后的形貌演变

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This work is aimed at studying the evolution of the morphology of industrial alumina powder after firing at 700-1800℃.Industrial alumina powder is composed of larger particles which are agglomerated by small hexagonal prism particles.After firing at 700, 800℃ and 900℃, the microstructure of alumina is not changed However, irregular grains begin to appear on the surface of the particles, and the boundaries between the grains are observable at 1000℃.With the increase of firing temperature, the grains separated from each other, the gaps between the grains increase, and the grains gradually grow.The grains become spherical and elliptical, and continue to grow at 1400℃.The spherical and elliptical grains form sintering neck at 1600 ℃.The alumina samples are not densification, and the grains do not continue to grow at 1700℃ and 1800 ℃.
机译:这项工作旨在研究工业氧化铝粉末在700-1800℃焙烧后的形貌演变。工业氧化铝粉末由较大的颗粒组成,并由小的六方棱柱体颗粒团聚。在700、800℃和900℃焙烧后,氧化铝的微观结构没有改变。但是,在1000℃时,颗粒的表面开始出现不规则的晶粒,并且可以观察到晶粒之间的边界。随着焙烧温度的升高,晶粒彼此分离,出现空隙。晶粒间增加,晶粒逐渐长大。晶粒变成球形和椭圆形,并在1400℃继续生长。球形和椭圆形的晶粒在1600℃形成烧结颈。氧化铝试样未致密化,晶粒不致密。在1700℃和1800℃继续生长。

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