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Reaction Synthesis and Pressureless Sintering of Cr2AlC Powder

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This work was aimed to produce Cr2AlC powder through two-step reactions and to sinter it under a pressureless condition, and the related synthesis and sintering mechanisms were evaluated. Cr2AlC powder of ∼9 m in size was produced using CrCx and Al powders and sintered to a relative density of ∼95.5%. The sintering was characterized by an activation energy of 267±23 kJ/mol and the mixed mode of sintering comprised of the surface diffusion mechanism and the transient liquid-phase sintering caused by melting of Al–Cr intermetallic impurities. The sintered sample exhibited Vickers hardness of 3.4 GPa.
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Document Type: Research Article

Affiliations: 1: Department of Mechanical Engineering, Center for Mechanical Technology and Automation, University of Aveiro, Aveiro 3810-193, Portugal 2: Division of Advanced Technology, Korea Research Institute of Standards and Science, Daejeon 305-340, Korea

Publication date: 2010-06-01

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