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US 4,379,720 AGranted
Nickel-aluminum-boron powders prepared by a rapid solidification process
AssigneeMarko Materials, Inc.
InventorsRanjan Ray, Viswanathan Panchanathan
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Abstract
Nickel-aluminum alloys containing boron in powder form are disclosed. These alloys are subjected to melt-spinning to form a brittle filament consisting in large measure of a metastable solid solution phase. This is then pulverized to powder configuration. Such powders exhibit excellent sprayability to form a dense, homogeneous, hard coating on a metallic substrate. The alloys, also exhibit excellent resistance to high temperature oxidation.
Claims3
A metallic alloy in powder form with particle size below 4 mesh (U.S. Standard), and having the composition described by the formula:
- Ni.sub.40-58 Al.sub.30-40 B.sub.12-20
- wherein Ni, Al, and B are nickel, aluminum, and boron respectively and wherein the subscripts are in atom percent and the total content of Ni, Al, and B is 100;
- wherein said alloy being prepared by the method comprising the steps:
- (a) forming a melt of said alloy
- (b) depositing said melt against a rapidly moving quench surface adapted to quench said melt at a rate in the range of approximately 10.sup.5 to 10.sup.7 .degree.C./second and form thereby a rapidly solidified brittle strip of said alloys characterized by hardness values between 800 and 1100 Kg/mm.sup.2
- (c) comminuting said strip into powders.
3 more elements
Dependencies are inferred from the claim text.