Densification Technique of Al₂O₃/Al Metal Ceramics Using Powder Metallurgy Method

Abstract:

In atmospheric environments, Al₂O₃ ceramics have good oxidation resistance in water, acid, and other solutions and suitable corrosion medium resistance. Al₂O₃ ceramics is one of the most widely used engineering ceramics. In this paper, Al₂O₃/Al cermet matrix composites were prepared by mixing a series of powders with aluminum and alumina powders as raw materials. The interface of Al₂O₃/Al cermet was observed by scanning electron microscopy. The densification process of Al₂O₃/Al cermet was then explored from the aspects of formulation, molding pressure, holding time, and sintering process. After mixing and dry pressing, 50 wt% Al and 50 wt% Al₂O₃ were appropriate for sintering. Following sintering and measuring density, density was improved under 20 MPa with a 20-minute holding time. Through a comparison of the sintering process, the interface structure was observed via scanning electron microscopy, which found that secondary sintering is conducive to improving the density of Al₂O₃/Al cermet.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 291-296
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.291
• Online since: August 2018
• Authors: Yin Yan Ju, Ai Xia Chen, Rui Hua Wang, Fang Wang, Ming Han Xu, Da Ming Du, Jie Guang Song, Lin Chen
• Keywords: Al, Al₂O₃, Densification Technology, Metal Ceramics

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