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US 6,884,275 B2Granted
Ni-based sintered alloy
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsIkuo Okada, Kei Ohsawa, Hidetaka Oguma, Koji Takahashi, Masahiko Onda, Takeshi Seto
Life of this patent
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Abstract
Disclosed is a Ni-based sintered alloy used for preparing a high temperature part utilized under a high temperature gas atmosphere, characterized in that the Ni-based sintered alloy is prepared by mixing and heating two kinds of Ni alloy powders differing from each other in the melting point.
Claims10
A Ni-based sintered alloy,
- prepared by mixing and heating two kinds of Ni alloy powders differing from each other in the melting point,
- and wherein the two kinds of Ni alloy powders consist of a high melting point Ni alloy powder having a melting point higher than the heating temperature in carrying out a sintering treatment, and a low melting point Ni alloy powder having a melting point lower than the heating temperature in carrying out the sintering treatment, and
- wherein IN738LC constitutes the Ni-based alloy used as a base material of the high temperature part, the high melting point Ni alloy powder has a composition of Ni-16 to 18 Cr-0 to 5 Co-0.0 to 3.5 W-0.0 to 1.0 Ta-0.0 to 1.0 Ti-0.0 to 1.0 Al-0.15 to 0.3 C-0.01 to 0.03 B-0.0 to 0.1 Zr, and the low melting point Ni alloy powder has a composition of Ni-8 to 12 Cr-16 to 20 Co-2.0 to 3.5 Mo-1.5 to 2.5 W-5 to 9 Ta-7.5 to 10 Ti-8.5 to 10.5 Al-1 to 3 Nb-0.5 to 3.5 B-0.00 to 0.35Zr.
A Ni-based sintered alloy, prepared by mixing and heating two kinds of Ni alloy powders differing from each other in the melting point, and
- wherein the two kinds of Ni alloy powders consist of a high melting point Ni alloy powder having a melting point higher than the heating temperature in carrying out a sintering treatment, and a low melting point Ni alloy powder having a melting point lower than the heating temperature in carrying out the sintering treatment, and
- wherein each of the high melting point Ni alloy powder and the low melting point Ni alloy powder is prepared by the heating at 1,150° C. to 1,250° C. for 2 to 12 hours for the sintering purpose.
Dependencies are inferred from the claim text.