Hard multilayer coated tool having increased toughness

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 14/06 (2006.01) C23C 28/04 (2006.01) C23C 30/00 (2006.01)

Patent

CA 2285460

A hard multilayer coated tool comprising: (a) a substrate (12); and (b) a multilayer coating (24) covering said substrate, said multilayer coating comprising first and second coating layers (14, 16) which are alternately laminated on said substrate, each of said first coating layers having an average thickness of 0.01-0.50~ m and containing titanium therein, each of said second coating layers having an average thickness of 0.01-0.50~ m and containing aluminum therein, said multilayer coating having an average thickness of 0.50-10.0~ m. The multilayer coating further comprises intermediate coating layers (22) each of which is interposed between said first and second coating layers, and each of which has an average thickness of 0.01-0.50~ m and contains aluminum therein, an aluminum content in said each of said intermediate coating layers being larger than that in said each of said first coating layers and smaller than that in said each of said second coating layers.

La présente invention concerne un outil revêtu multicouches dur comprenant: (a) un substrat (12); et (b) un revêtement multicouches (24) recouvrant ledit substrat, le revêtement multicouches comprenant des premières et des deuxièmes couches de revêtement (14, 16) laminées en alternance sur le substrat, chacune des premières couches possédant une épaisseur moyenne de 0,01 à 0,50 DEG m et contenant du titane, et chacune des deuxièmes couches possédant une épaisseur moyenne de 0,01 à 0,50 DEG m et contenant de l'aluminium, le revêtement multicouches possédant une épaisseur moyenne de 0,01 à 10,0 DEG m. Le revêtement multicouches comprend en outre des couches de revêtement intermédiaires (22) dont chacune est intercalée entre une première et une deuxième couche de revêtement, et dont chacune possède une épaisseur moyenne de 0,01 à 0,50 DEG m et contient de l'aluminium, la teneur en aluminium de chacune des couches intermédiaires étant supérieure à celle de chacune des premières couches de revêtement et inférieure à celle de chacune des deuxièmes couches de revêtement.

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