WEAR-RESISTANT HARD COATING FOR BLANK AND METHOD OF ITS PRODUCTION Russian patent published in 2012 - IPC C23C4/12 C23C28/04 

FIELD: metallurgy.

SUBSTANCE: when processing especially hard materials, such as tempered instrumental steel, with hardness of more than 50, preferably 55 HRC, a blank is used with a wear-resistant multi-layer coating. The coating includes at least the first bearing layer from a material with the following composition: (Ti_aAl_1-a)N_1-x-yC_xO_y, in which 0.4<a<0.6, and 0<x and y<0.3, or (Al_bCr_1-b)N_1-x-yC_xO_y, in which 0.5<b<0.7, and 0<x and y<0.3, and the second nanocrystalline layer of a material with the following composition: (Al_1-c-d-eCr_cSi_dM_e)N_1-x-yC_xO_y, where M stands for at least one element from transition metals of groups 4, 5, 6 of the periodical system, apart from chrome, and 0.2<c<0.35, 0<d<0.20, 0<e<0.04.

EFFECT: improved process characteristics of materials, mechanical processing of which is difficult.

24 cl, 7 tbl, 8 ex