Method of producing an erosion-resistant surface/layer on a meta

Details Method of producing an erosion-resistant surface/layer on a meta Method of producing an erosion-resistant surface/layer on a meta

1987-02-04

1990-03-06

Lechert, Jr., Stephen J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

419 8, 419 54, 419 57, 419 58, 419 12, 419 17, 419 18, 427191, 428553, 428564, 428680, 428220, 4289088, B22F 300

Patent

active

049065297

ABSTRACT:
A method is provided for producing an erosion-resistant layer or coating on the surface of a metallic workpiece. The method includes providing a thermally sprayable alloy of Ni-Cr-Fe-B-Si and thermally spraying the alloy on the workpiece to a specified thickness, following which the sprayed-on layer is heated in vacuum to a temperature between 250.degree. C. to 400.degree. C. for a time at the stated temperature of about 5 to 30 minutes sufficient to effect degassing of the layer. The temperature of the layer is thereafter raised to a range of about 800.degree. C. to 950.degree. C. and maintained at that temperature in vacuum for between 5 to 30 minutes. The temperature at the layer is then raised to between 900.degree. C. and 1100.degree. C. under a protctive atmoshpere at a pressure of between 200 to 600 mm Hg to effect fursion of the layer at above its melting point, following which the coated metallic workpiece is finally cooled to room temperature under the protective atmosphere.

REFERENCES:
patent: 3961098 (1976-06-01), Bessen
patent: 3991240 (1976-11-01), Harrington et al.
patent: 4173685 (1979-11-01), Weatherly

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