SHI Linpu, ZHAO Yanfei, XUE Jianqiang, ZHANG Xiuqin. Effect of Particle Size and Forming Pressure on Sintering Behavior of α-Al2O3 Powders[J]. Development and Application of Materials, 2020, 35(1): 1-4.
Citation: SHI Linpu, ZHAO Yanfei, XUE Jianqiang, ZHANG Xiuqin. Effect of Particle Size and Forming Pressure on Sintering Behavior of α-Al2O3 Powders[J]. Development and Application of Materials, 2020, 35(1): 1-4.

Effect of Particle Size and Forming Pressure on Sintering Behavior of α-Al2O3 Powders

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  • Received Date: June 04, 2019
  • Available Online: March 17, 2024
  • α-Al2O3 powders with D50 of 0.171 μm and 0.432 μm were used as raw materials, the green bodies were prepared under various forming pressures and sintered at 1 450 ℃. The effects of particle size and forming pressure on the sintering behavior of α-Al2O3 powders were studied. α-Al2O3 powder with D50 of 0.432 μm exhibited low sintering activity. The relative density of its green body increased from 54.1% to 56.6%, and the relative density of sintered body increased from 93.2% to 94.9%, when the forming pressure increased from 100 MPa to 300 MPa. α-Al2O3 powder with D50 of 0.171μm exhibited high sintering activity, when the forming pressure increased from100 MPa to300 MPa. The relative density of its green body increased from 51.3% to 53.8%, but the relative density of sintered body maintained between 98.6%~98.8%. The results showed that improving the forming pressure had limited influence on sintering performance of α-Al2O3 powders. Reducing the particle size and improving the sintering activity was the key factors to increase sintering density and reduce sintering temperature of Al2O3 ceramic.
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