Thermodynamics of densification of powder compact

Citation:

Hirata, Y. ; Hara, A. ; Aksay, I. A. Thermodynamics of densification of powder compact. Ceramics International 2009, 35, 2667-2674.

Date Published:

Sep

Type of Article:

Article

ISBN Number:

0272-8842

Accession Number:

WOS:000268656400016

Abstract:

This paper established a necessary condition for the sintering of powder compacts by examining the total free energy balance in terms of the particle size, neck size and contact number. The thermodynamic analysis of the proposed model clarifies the relation of shrinkage (q) of powder compact-contact angle (phi)-relative density at a given dihedral angle (phi(e)) of a grain boundary. Faster densification proceeds in the region with a larger coordination number (n) of particles at a small q value. A large shrinkage is needed to eliminate the large pores formed in the structure of small n value. Full density can be achieved in the range of 117 degrees