Effect of characteristics of submicrometer powder on the sintering behaviors of Al2O3 ceramic
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The sintering behaviors of high purity Al2O3 ceramics prepared from a submicron-scale powder were investigated. The effectsof ball milling on the evolution of alumina powders’ compressibility, sinterability, grain growth and microstructure duringsintering process were studied. It was observed that the relative density of the Al2O3 ceramics increased with increasingcompaction pressure on the green compacts and the sintering temperature. However, the applied pressure had less influenceon the relative density of ceramics sintered from green compact with narrower size distribution and finer powder. The fastgrain growth of the Al2O3 ceramics occurred in different temperature ranges and was influenced by milling time and formingmethods. The effect of milling on the microstructural evolution of alumina during sintering was also discussed.
Abstract
The sintering behaviors of high purity Al2O3 ceramics prepared from a submicron-scale powder were investigated. The effectsof ball milling on the evolution of alumina powders’ compressibility, sinterability, grain growth and microstructure duringsintering process were studied. It was observed that the relative density of the Al2O3 ceramics increased with increasingcompaction pressure on the green compacts and the sintering temperature. However, the applied pressure had less influenceon the relative density of ceramics sintered from green compact with narrower size distribution and finer powder. The fastgrain growth of the Al2O3 ceramics occurred in different temperature ranges and was influenced by milling time and formingmethods. The effect of milling on the microstructural evolution of alumina during sintering was also discussed.
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