RARE-EARTH-CONTAINING SINTERED ALLOY

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PROBLEM TO BE SOLVED : To provide a rare-earth-containing sintered alloy containing rare-earth oxides by which remarkable improvement of practical performance and expansion of applications can be attained by improving hardness and wear resistance simultaneously with toughness and chipping resistance. SOLUTION : A compound oxide consisting of chromium oxide and rare earth oxide is added as disperse-phase-forming powder to a starting material for a hard sintered alloy. By this method, the rare-earth-containing sintered alloy consisting of the following phases can be obtained : a binder phase composed mainly of iron-group metals; a disperse phase composed mainly of the compound oxide consisting of an oxide of at least one among scandium, yttrium and lanthanides and chromium oxide; and a hard phase composed mainly of at least one kind among the carbides and nitrides of the group IVa, Va and VIa metals of the periodic table and mutual solid solutions thereof.