Oxide-dispersion-strengthened heat-resistant chromium-based sintered alloy
AssigneeKubota Corporation
InventorsToshiaki Morichika, Takashi Onishi, Hiroshi Yamamoto, Koichi Yanai, Hiroyuki Araragi
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Abstract
An oxide-dispersion-strengthened sintered alloy improved in oxidation resistance and compressive strength for use at high temperatures of at least 1350.degree. C. The alloy includes a matrix of a metal consisting substantially or predominantly of Cr, and 0.2 to 2.0% by weight of Y.sub.2 O.sub.3 uniformly dispersed in the matrix. The Y.sub.2 O.sub.3 as uniformly dispersed is up to 0.1 .mu.m in mean particle size.
Claims2
An oxide-dispersion-strengthened heat-resistant-sintered alloy including 0.2 to 2.0% by weight of Y.sub.2 O.sub.3, wherein the Y.sub.2 O.sub.3 is uniformly dispersed in a metal matrix by a mechanical alloying process, as discrete particles with a mean particle size of up to 0.1 .mu.m, the metal being selected from the group consisting of:
- (a) a metal consisting essentially of more than 0% to up to 20% of Fe, and the balance substantially Cr;
- (b) a metal consisting essentially of 0% to up to 20% of Fe, at least one member selected from the group consisting of Al, Mo, W, Nb, Ta, Hf and Al-Ti in a total amount of more than 0% to up to 10%, and the balance substantially Cr;
- (c) a metal consisting essentially of more than 0% to up to 20% of Fe, 0.1 to 2.0% of Ti, and the balance substantially Cr;
- and
- (d) a metal consisting essentially of more than 0% to up to 20% of Fe, 0.1 to 2.0% of Ti, at least one member selected from the group consisting of Al, Mo, W, Nb, Ta, Hf and Al-Ti in a total amount of more than 0% to up to 10%, and the balance substantially Cr;
- wherein said mechanical alloying process comprises forcibly finely dispersing said Y.sub.2 O.sub.3 into said metal by means of a high energy ball mill.
Dependencies are inferred from the claim text.