Reaction Synthesis and Pressureless Sintering of Cr2AlC Powder
Abstract: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.
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: June 1, 2010