Preparation and Characterization of Al₂O₃-Al Cermet with Coated Microstructure Using Powder Metallurgy Method

Abstract:

Cermet includes the excellent properties of ceramic materials and the advantages of metal materials, so it is an important new engineering material. In this paper, Al₂O₃-Al cermet is prepared using different molding process via the powder metallurgy method to study the properties of Al₂O₃-Al cermet. The conclusion are shown the increasing density of Al₂O₃-Al cermet is not obvious with increasing the forming pressure of cermet body during the initial and late processing, but the increasing density is more obvious under the forming pressure for 20-30MPa. The density of cermet materials are increased with prolonging holding pressure time, the initial increase speed is faster, and the later growth rate becomes weaker. When the molding pressure is 30MPa, the holding time is 10min, the sintering temperature is 900°C, the holding time is 1h, the prepared Al₂O₃-Al cermet adding sintering aids has a coated microstructure, which indicates that the large number of particles is migrated on the grain boundary. The sample density is 2.26g/cm³, the density is highest, the distribution of Al₂O₃ and Al phase is the most uniform. The buried sintering method is more suitable for the preparation of Al₂O₃-Al cermet composites than the nudity sintering method.

• Periodical: Solid State Phenomena (Volume 279)
• Pages: 119-123
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.279.119
• Online since: August 2018
• Authors: Rui Hua Wang, Ai Xia Chen, Da Ming Du, Fang Wang, Cai Wen Li, Qiu Min Zou, Jie Guang Song*, Lin Chen, Cheng Wei Hao
• Keywords: Al, Al₂O₃, Cermet, Coated Microstructure, Powder Metallurgy Method

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