WEAR RESISTANT MEMBER COMPRISED OF SILICON NITRIDE AND PROCESS FOR PRODUCING THE SAME

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A wear resistant member comprised of silicon nitride characterized in that it consists of a silicon nitride sintering compact comprising 2 to 4 mass%, in terms of oxide, of rare earth element as a sintering auxiliary agent, 2 to 6 mass%, in terms of oxide, of Al component and 2 to 7 mass% of silicon carbide, which sintering compact has a porosity of 1% or less, a three-point bending strength of 800 to 1000 MPa and a fracture toughness of 5.7 to 6.5 MPa·m1/2. Under these conditions, there can be provided a wear resistant member comprised of silicon nitride which even in the preparation from cheap silicon nitride powder produced by metal nitriding process, exhibits a mechanical strength, excellent wear resistance and rolling life being identical with or superior to those of conventional silicon nitride sintering compact and which furthermore excels in workability, and can be provided a process for producing the same.