Study of the Effect of Temperature Regime on the Sintering Properties of Alumina Ceramics
Alumina ceramics are widely used in daily production and life because of its wide source of raw materials,low cost,excellent physical and mechanical properties,and very stable chemical properties,which play an important role in the fields of chemical industry,military industry,medical treatment,aerospace and so on.Due to the high melting point of alumina,the process of sintering alumina ceramics has high energy consumption,high damage to the kiln body and long sintering time.Research and development of appropriate sintering system is conducive to reducing the sintering temperature of alumina ceramics,reducing the sintering time,controlling the grain growth of ceramics,improving the sintering performance of ceramics,and should be and respond to the national energy saving and emission reduction call.In this paper,granulated powder with 99.99%α-Al2O3 content was dry-pressed and molded by 120 MPa pressure and sintered at atmospheric pressure.The properties of the sintered ceramics were characterized to explore the suitable temperature and sintering regime.Experiments show that:starting from 1000℃to 1500℃at a rate of 8℃/min,insulation 1 h,the relative density of the specimen reaches 97.43%,the microstructure is more uniform,the mechanical properties are better,the average grain size of the grain is 1.31 μm.
heating rateholding timerelative densitymechanical propertiessintering temperature
万方数据
维普
