Diamond coated cutting tools and method of manufacture

Details Diamond coated cutting tools and method of manufacture Diamond coated cutting tools and method of manufacture

C - Chemistry, Metallurgy

23

C

C23C 8/02 (2006.01) C23C 16/02 (2006.01) C23C 16/27 (2006.01) C23C 30/00 (2006.01)

Patent

CA 2348851

A coated body that has a substrate (20) of tungsten, carbon, and cobalt, and wherein the substrate presents a surface (22, 24). Eta phase is present at the surface (22, 24) of the substrate. Fibrous tungsten carbide grains are present at the surface (22, 24) of the substrate (20). The surface (22, 24) of the substrate (20) has a surface roughness, Ra, of greater than about 12 microinches. A coating layer (34) is on the surface (22, 24) of the substrate (20). A process for making a coated body comprising the steps of: providing a substrate (20) comprising tungsten, carbide and cobalt, and the substrate having at least one surface (22, 24) with eta phase thereon; subjecting the substrate (20) with eta phase on the surface (22, 24) thereof to a conversation treatment at a temperature between about 1250~C and about 2000~C under at least a partial vacuum for a duration sufficient as to convert at least a portion of the eta phase to fibrous tungsten carbide grains that the fibrous tungsten carbide grains are at the surface (22, 24) whereby the substrate surface (22, 24) presents a surface roughness, Ra, of greater than 12 microinches; and applying a coating (34) to the surface (22, 24) of the substrate (20).

L'invention concerne un corps revêtu ayant un substrat (20) en tungstène, carbone et cobalt qui présente une surface (22, 24). La phase eta est présente à la surface (22, 24) du substrat. Des grains de carbure de tungstène fibreux sont présents à la surface (22, 24) du substrat, laquelle (22, 24) a une rugosité de surface, Ra, supérieure à environ 12 micropouces. Une couche (34) recouvre la surface (22, 24) du substrat (20). Un procédé de fabrication d'un corps revêtu consiste à présenter un substrat (20) renfermant du tungstène, du carbone et du cobalt ledit substrat présentant au moins une surface (22, 24) recouverte de la phase eta; à soumettre ledit substrat (20), dont la surface (22, 24) est recouverte de la phase eta, à un traitement de conversion à une température se situant entre environ 1250 ·C et environ 2000 ·C, sous au moins un vide partiel pendant une durée suffisamment longue pour convertir au moins une partie de la phase eta en grains de carbure de tungstène fibreux, lesdits grains étant à la surface (22, 24), de sorte que ladite surface (22, 24) présente une rugosité de surface, Ra, supérieure à 12 micropouces; et à appliquer un revêtement (34) sur la surface (22, 24) du substrat (20).

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