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Reaction Synthesis and Pressureless Sintering of Cr 2 AlC Powder
Author(s) -
Panigrahi Bharat Bhooshan,
Chu MinCheol,
Kim YongIl,
Cho SeongJai,
Gracio Jose J.
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03560.x
Subject(s) - sintering , materials science , intermetallic , vickers hardness test , activation energy , impurity , diffusion , metallurgy , relative density , liquid phase , phase (matter) , microstructure , chemistry , physics , organic chemistry , alloy , thermodynamics
This work was aimed to produce Cr 2 AlC powder through two‐step reactions and to sinter it under a pressureless condition, and the related synthesis and sintering mechanisms were evaluated. Cr 2 AlC powder of ∼9 μm in size was produced using CrC x 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.