Stratified protecting coating for wearing pieces and hard metal

Details Stratified protecting coating for wearing pieces and hard metal Stratified protecting coating for wearing pieces and hard metal

1979-06-15

1980-12-02

Bell, James J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

148 63, 148 165, 148 166, 427249, 427419F, 428457, 428469, 428472, 428539, 428339, B32B 702, B32B 1518

Patent

active

042371848

ABSTRACT:
This invention relates to a hard metal wearing piece, especially for tools, which is covered at least on the places subjected to wear with stratified protecting coating. This stratified protecting coating comprises at least five superimposed layers, at least two of them being of different compositions; furthermore, the internal layer in contact with the substrate is a layer of carbide, the external layer is a layer of boride or carbide, and the intermediary layers are of carbide, nitride, oxide, boride, and/or of mixed compounds thereof.

REFERENCES:
patent: 3368914 (1968-02-01), Darnell et al.
patent: 3640689 (1972-02-01), Glaski et al.
patent: 3656995 (1972-04-01), Reedy
patent: 3959557 (1976-05-01), Berry
patent: 3964937 (1976-06-01), Post et al.
patent: 4018631 (1977-04-01), Hale

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