Nickel-base sigma-gamma in-situ intermetallic matrix composite

Details Nickel-base sigma-gamma in-situ intermetallic matrix composite Nickel-base sigma-gamma in-situ intermetallic matrix composite

1996-10-30

1999-01-12

Phipps, Margery

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

148442, 148419, 148404, 148538, 148537, 148522, 148428, 148555, 416241R, 416223R, 427124, 427142, 4272481, 427250, 427566, B32B 1500, B05D 306, C23C 1600, B63H 126

Patent

active

058585583

ABSTRACT:
A nickel-base gamma-sigma intermetallic matrix composite material suitable for forming gas turbine engine components and structural coatings for such components. The composite material contains, in weight percent, about 20 to 50 chromium, about 0 to 32 molybdenum, and about 0.5 to 7 silicon, with the balance being nickel and incidental impurities. In addition, the composite material may contain aluminum and titanium in amounts of up to about 7 and 3 weight percent, respectively. The resulting intermetallic matrix composite material is characterized by a sigma volume fraction of greater than 30 percent, preferably at least about 50 percent, and may have a dendritic, fibrous or lamellar microstructure. The composite material can be cast to form a component, or deposited by known techniques to form a structural coating on a component.

REFERENCES:
patent: 3671223 (1972-06-01), Thompson et al.
patent: 3783033 (1974-01-01), Tarshis
patent: 4764225 (1988-08-01), Shankar et al.
E. Grundy, "Solidification and Properties of Ni-Cr-Mo and Ni-Cr-W Monovariant Eutectics", Conference on In Situ Composites-III (1979), pp. 431-440.

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