Complex - boride - cermet - body, a method for its production and use of the body.

摘要

The invention relates to a complex boride-cermet body, with a hard phase made from at least one crystalline phase and a binder phase, whereby the proportion of binder phase in the body amounts to up to 30 mass % and the binder phase comprises at least one of the elements Fe, Ni, or Co. Further, at least one crystalline hard phase contains a boride of structure Me1-Me2-B, in which Me1 = Mo and/or W and Me2 = Fe, Ni or Co. According to the invention, in the boride hard phase a) at least 5 atom % to a maximum of 50 atom % of the metal Me1 is replaced by one or more metals of the group Mo, W, Cr and/or V, which is/are different from Me1 and b) up to 100 atom % of the metal Me2 is replaced by at least one further metal, different to Me2 from the group Fe, Co, Ni, Cr and V. The binder phase comprises at least one crystalline phase and contains at least two of the elements Fe, Ni, Co, Cr, Mo, W, Zr or V. The invention further relates to a method for production of said complex boride-cermet body, whereby, during the heating to the sintering temperature, the temperature is held constant for a time of up to 180 min at a temperature below that at which a liquid phase forms, or a greatly reduced rate of heating of under 5°C/min is used.