Patent ID: 6248434
Filing Date: 2001-06-19
Classification: B22F,C04B,C23C,Y10T

Abstract:
A method of producing coated cermet, hard-metal or ceramic substrate bodies comprising the steps of:(a) precompressing a green compact from an initial powder mixture continuing a wax and powders sinterable to form a cermet, hard-metal or ceramic body;(b) dewaxing the green compact;(c) after dewaxing and with the green compact still having open porosity, treating the green compact with reaction gases or sublimable solid materials capable of forming a coating on the body at a temperature between 600.degree. C. and 100.degree. C., then increasing the temperature of the green compact and completely densifying the green compact by sintering in a microwave field; and(d) thereafter applying at least one layer of hard material, ceramic, diamond-like layers, hexagonal boron nitride and/or amorphous carbon to the sintered body.