Sintering Kinetics of Cr2AlC Powder

Joshi, A M (2014) Sintering Kinetics of Cr2AlC Powder. Masters thesis, Indian Institute of Technology, Hyderabad.

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Abstract

Cr2AlC is one of the important member of MAX phase group. Sintering kinetics of freshly synthesis Cr2AlC ternary carbide powder has been studied using dilatometric sintering methods. Dilatomertic data showed that onset of sintering of Cr2AlC powder was about 1180 0C. There was a distinct change in the sintering rate at about 1315 0C. Non-isothermal sintering kinetics of Cr2AlC powder were analyzed for different sintering mechanisms. Two different sintering models, i.e., Young & Cutler’s model and Johnson’s model were employed to estimate the diffusion parameters such as diffusion coefficients and activation energies. The estimation of diffusion coefficient were carried out for a range of particle sizes. Attempts were made to study the effect of sintering aids on the densification behavior of Cr2AlC powder. Various amount of Zr powder was used as sintering aid. It was noticed that large amount of Zr caused expansion on the compact, Very small amount of Zr powder may be helpful to enhance the sintering of Cr2AlC.

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