Patent ID: 6190762
Filing Date: 2001-02-20
Classification: C22C,Y10T

Abstract:
An oxide free composite body with a binder metal phase and at least one hard phase comprised of:a cermet material with a binder metal phase of 3 to 30 mass percent, the balance being at least one carbonitride phase or;a hard metal with at least one hard material phase of 65 to 99 mass percent, the balance being a binder metal phase, wherein the metals of the hard material phase or the carbonitride phase, carbon of the hard material phase or the carbonitride phase, and metal nitrides of the carbonitride phase and solid nitrogen compounds as suppliers of carbon or nitrogen of the hard material phase or the carbonitride phase, are originally exclusively each in powder form and mixed together and compacted to a green body which is then, subjected to reaction sintering under a pressure of <5.times.10.sup.5 Pa in a microwave field to chemically form the hard phase or the carbonitride phase and in which the hard phase formed forms a liquid phase with the remaining substances which do not participate in the hard phase reaction, the cermet material being in the form of a cermet composite body with at least 70 volume % having a mean grain size <0.4 .mu.m, the hard metal forming a composite body with at least 70% having a mean grain size <0.5 .mu.m.