Patent ID: 6325958
Filing Date: 2001-12-04
Classification: B22C,B22F,B28B,B29C,C04B

Abstract:
A method for manufacture of a mold core comprising, in combination, the steps of:(a) formulating a mix consisting essentially of(i) a matrix material selected from the group consisting of ceramic microbeads, metal microbeads, polymeric microbeads and mixtures thereof,(ii) a polymer binder selected from the group consisting of poly(2-ethyl-2-oxazoline), derivatives of poly(2-ethyl-2-oxazoline) and mixtures thereof with water, and(iii) a polymer binder selected from the group consisting of polyvinylpyrrolidone, derivatives of polyvinylpyrrolidone and mixtures hereof with water;(b) casting the mixture in a mold form to mold a billet;(c) dewatering the billet by draining water from the mold;(d) drying the billet to remove residual water; and(e) machining the billet to a desired shape.