TOOL MADE OF HARD ALLOY CONTAINING TITANIUM AND TUNGSTEN CARBIDES Russian patent published in 2007 - IPC B23P15/28 E21B10/46 C22C29/00 

FIELD: powder metallurgy, namely manufacture of hard alloy tools for cold and hot mechanical working, possibly production of cutting tools, drilling tools and draw plates.

SUBSTANCE: tool is made of hard alloy containing tungsten monocarbide, titanium carbide and cementing cobalt binder. Near-surface layer with thickness 3.5 -15 micrometers includes 50 -99.5 mass% of (Ti,W)C. Crystalline lattice of WC in near-surface layer has disorder < 1. Crystalline lattices of WC and (Ti,W)C have integral disorder (b/a)_Σ less than 1.3. (b/a)_Σ = (b/a)_(Ti,W)C - C_(Ti,W)C +(b/a)_WC - C_WC where (b/a)_(Ti,W)C -disorder of crystalline lattice of (Ti,W)C; (b/a)_WC -disorder of crystalline lattice of WC; C_(Ti,W)C - concentration of (Ti,W)C, mass%; C_WC - concentration of WC, mass %; b = β₂/β₁; a = tgν₂/tgν₁; β - physical widening of diffraction line; ν - angular position of gravity center of diffraction line; 1, 2 - indexes corresponding to diffraction lines taken at small and large diffraction angles of X-rays.

EFFECT: high strength of tool and therefore its increased useful life period.

1 dwg, 3 tbl