Hard alloy blade and preparation method thereof

Abstract

The invention discloses a hard alloy blade and a preparation method thereof. The hard alloy blade comprises a hard alloy blade basal body and a coating layer; the hard alloy blade basal body uses Co as a binding phase, and uses tungsten carbide and a titanium-contained cubic-phase compound as a hard phase; the solid solution is performed for a W element and a Cr element in the binding phase; the mass fraction of the W element in the binding phase is 2-10 wt.%; the mass fraction of the Cr element in the binding phase is 1-10 wt.%; the titanium-contained cubic-phase compound is a carbon-nitrogen compound containing one or two in a Ta element and a Nb element and a Ti element; and the grain distribution of tungsten carbide has a double-peak structure. The preparation method comprises batching, powder preparation by mixing, molding by pressing, sintering and preparation of a coating layer. The hard alloy blade has the advantages of high hardness, toughness and strength and excellent and stable cutting performance, and is high in generality, suitable for various processing fields, simple in preparation method and low in cost.

Description

technical field [0001] The invention relates to a cemented carbide blade, in particular to a cemented carbide coated blade with a non-uniform WC particle size distribution and a surface layer lacking a cubic phase gradient structure. Background technique [0002] The material for making metal cutting tools must have high high temperature hardness and wear resistance, have the necessary bending strength, impact toughness and chemical inertness, and good processability (cutting, forging and heat treatment, etc.), and not easily deformed. However, the higher the hardness of the material, the lower its toughness, that is to say, it is difficult to have both hardness and toughness of the material at the same time. The prior art uses non-uniform structure or gradient structure to improve the performance of cemented carbide. For example, the patent document US4277283 US patent document and CN1079179A Chinese patent document have disclosed a cemented carbide substrate lacking a cubi...

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Problems solved by technology

However, the above-mentioned literature only optimizes the performance of the cutting insert from one angle alone, and the cutting insert is not versatile and has certain limitations.

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