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Nonisothermal sintering of Cr 2 AlC powder
Author(s) -
Rajkumar Yembadi,
Rahul Bapurao M.,
Ananth Akash Puppala,
Panigrahi Bharat B.
Publication year - 2016
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12617
Subject(s) - materials science , dilatometer , sintering , activation energy , thermal diffusivity , grain boundary diffusion coefficient , diffusion , volume (thermodynamics) , chromium , shrinkage , metallurgy , composite material , grain growth , grain boundary , grain size , thermodynamics , microstructure , thermal expansion , chemistry , physics
This work studies the sintering behavior of ultrafine powder of Cr 2 AlC compound during nonisothermal heating using a dilatometer. Sample exhibits relatively slower densification under pressureless condition where relative density increased from about 61% (green compact) to about 73% during heating up to 1350°C. Axial shrinkage data were analyzed through the volume diffusion and grain boundary diffusion‐based sintering models. Estimated activation energy of sintering (352 kJ /mol) for volume diffusion mechanism, was found to be closely matching with the reported activation energy of chromium diffusivity, indicating volume diffusion as a controlling mechanism and chromium as a major diffuser in Cr 2 AlC.
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