액상량이 적은 액상소결계의 치밀화에 관한 해석

Abstract

The densification behavior has been analyzed for a liquid phase sintering system with closepacked spherical particles(face-centered cubic structure) and limited volume of liquid. The specimen shrinkage has been calculated on the basis of the two-particle model up to the moment of the liquid filling of tetrahedral sites. As the volume of liquid(V¹) decreases, the shrinkage and densification rates increase because of high capillary pressure. The closure of interconnected pore channels and the liquid filling of tetrahedral sites, however, occur in shorter sintering time for the particles array with higher liquid volume. As V¹decreases, the dominant mechanism for densification changes from the pore filling to the contact flattening. When V¹is less than 0.1 vol% the condition for the liquid filling of tetrahedral sites can not be reached until the densification by contact up to 97% relative density. The applicability and limiation of the present calculation are discussed.