Bicrystal gradient hard alloy cutter material and preparation method thereof

Abstract

The invention belongs to the field of manufacturing of hard alloys, in particular to a bicrystal gradient hard alloy cutter material and a preparation method thereof. The bicrystal gradient hard alloy cutter material adopts tungsten carbide, titanium carbide, cobalt, vanadium carbide, chromium carbide and polyvinylpyrrolidone as raw materials; five symmetric gradient layers are provided; each layer contains coarse-grain tungsten carbide and fine-grain tungsten carbide from surface to inside; the ratio of coarse-grain tungsten carbide to fine-grain tungsten carbide is increased; the ratio of titanium carbide is reduced; and the ratio of a binding phase is increased. The preparation method comprises the steps of: ball milling of a mixture-drying and screening-molding by pressing-vacuum hot press sintering. The preparation method is low in equipment investment, convenient for operation, high in material utilization rate and suitable for industrial production; and the prepared product has a surface for satisfying the requirements of double high (high wear resistance and high toughness), and in particular, is suitable for interrupted metal turning and milling.

Description

technical field [0001] The invention belongs to the field of hard alloy manufacturing, and in particular relates to a twin-crystal gradient hard alloy cutting tool material satisfying "double high" (high wear resistance and high toughness) and a preparation method thereof. Background technique [0002] Since in the homogeneous cemented carbide, the hardness and wear resistance of the cemented carbide play an important role, the bonding has an important impact on the strength and toughness of the alloy. Due to the different effects of the two phases that make up the cemented carbide, the homogeneous structure cemented carbide becomes a contradiction. Generally speaking, alloys with higher binder phase content and lower hard phase content have low hardness and high toughness; alloys with high hard phase content and low binder phase content have high hardness and poor toughness. The contradictory characteristics of uniform structure cemented carbide restrict the further expans...

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Problems solved by technology

Literature (The influence of sintering in nitrogen gason the microstructure of a WC–VC–TiC–Co cemented carbide, Hashe N G, Neethling J H, Andrén H O, et al, International Journal of Refractory Metals and Hard Materials, 2008, 26(5) : 404-410.) reported that a gradient cemented carbide surface rich in cubic phase has good surface wear resistance, but poor surface toughness; literature (Advances in modern nitrogen-containing hardmetals and cermets[J].Chen L, Lengauer W , Dreyer K.Int J Refract Met HardMater, 2000,18 (2): 153-161.) reported a kind of cemented carbide whose surface is rich in binder phase, the surface toughness is good, but the surface wear resistance is poor, often need to be in hard surface coating