Ceramics coated cemented-carbide tool with high-fracture resista

Details Ceramics coated cemented-carbide tool with high-fracture resista Ceramics coated cemented-carbide tool with high-fracture resista

1990-09-04

1992-06-23

Dixon, Jr., William R.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51309, B24B 100

Patent

active

051239345

ABSTRACT:
A cemented carbide tool of excellent wear resistance and fracture resistance includes a substrate of cemented carbide, and a ceramic coating layer by chemical vapor deposition. The thickness of the layer is in the range of between 2 .mu.m to 20 .mu.m, and the layer has cracks of such a depth that the cracks extend perpendicularly from a surface of the layer to the substrate. The cracks are formed in a network-like pattern to minutely divide the layer. The average value of the depths of the cracks in a direction perpendicular to the surface of the layer is not less than the thickness of the layer and not more than a value equal to the coating thickness plus 5 .mu.m. The average value of widths of the cracks is not more than 2 .mu.m. The average value of intervals between the cracks is not less than 10 .mu.m and not more than 100 .mu.m.

REFERENCES:
patent: 4234661 (1980-11-01), Lee et al.
patent: 4240807 (1980-12-01), Kronzer
patent: 4377371 (1983-03-01), Wisander et al.
patent: 4441894 (1984-04-01), Sarin et al.
patent: 4469489 (1984-09-01), Sarin et al.
Interrupted Cutting Tests of Cemented Carbide Tools Coated by Physical Vapor Deposition and Chemical Vapor Deposition Techniques, Thin Solid Films, vol. 96, No. 1, Oct. 1982, Kodama, et al.

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