MULTI−ELEMENT CERAMIC POWDER AND METHOD FOR PREPARATION THEREOF,AND SINTERED COMPACT AND METHOD FOR PREPARATION THEREOF

摘要

A method for preparing a multi−element ceramic powder which comprises forming an alloy powder having W, Cr, at least one of Ti, Zr and Hf, and at least one of V, Nb and Ta as constituent components by mechanical alloying, and then subjecting said alloy powder to a heat treatment together with a powdery carbon material and a catalyst in the presence of a nitrogen gas, to thereby effect the carbo−nitriding of the alloy and form the multi−component ceramic powder; a method for preparing a sintered compact from the multi−element ceramic powder which comprises sintering the ceramic powder; a method for preparing another multi−element ceramic powder which comprises forming a powder of a first substance having at least two metal elements selected from the group of Ti, Al, V, Nb, Zr, Hf, Mo, Ta, Cr and W as constituent elements, enveloping the surface of the resultant formed product with a second substance having a metal element not contained in the first substance as its constituent element, and subjecting the enveloped product to a heat treatment in a nitrogen containing atmosphere to form a porous sintered product, followed by pulverization; and a method for preparing a sintered compact having the same composition as that of the another multi−element ceramic powder which comprises heating the enveloped product to a temperature sufficient for forming a sintered compact.