Tungsten carbide-based hard alloy and preparation method thereof

Abstract

The invention relates to the technical field of alloy materials, in particular to a tungsten carbide-based hard alloy and a preparation method thereof. According to the tungsten carbide-based hard alloy, at least five of molybdenum powder, vanadium carbide, chromium carbide, titanium carbide, silicon carbide and yttrium oxide form a gain agent according to a certain proportion; the gain agent can inhibit the over-quick and / or irregular growth of tungsten carbide crystal grains so that the tungsten carbide-based hard alloy has high strength, toughness and plasticity; particularly, when the gain agent is used in a best proportion, the tungsten carbide-based hard alloy can have higher comprehensive mechanical properties and a better effect. The grain size of each substance is less than or equal to 1.2 micron, and the purity is over 99.9 percent, so that the substances are highly mixed; cobalt powder and nickel powder together form a bonding agent, so that other substances are in full contact with the bonding agent to increase a binding area and improve bonding force; therefore, the toughness of the tungsten carbide-based hard alloy can be improved. Paraffin is easily dispersed into a composite raw material by adding carbon tetrachloride solution of the paraffin into the composite raw material.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a tungsten carbide-based hard alloy and a preparation method thereof. Background technique [0002] Cemented carbide is made of high-hardness refractory metal carbide powder (WC, TiC, TaC, NbC, etc.) as the main phase, with transition metal cobalt, nickel, etc. alloy. Cemented carbide has excellent properties such as high hardness, high strength, high toughness, wear resistance, high temperature resistance and small expansion coefficient, so it is widely used in fields such as cutting, drilling, mining, tool forming and wear-resistant parts. Compared with high-speed steel, cemented carbide has better red hardness. When the temperature exceeds 600°C, its hardness is higher than that of high-speed steel at room temperature; when the temperature exceeds 1000°C, the hardness of cemented carbide is still higher than that of normal temperature carbon steel. . [0003] In the...

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Problems solved by technology

[0004] The present invention aims at the problem that the performance of the prepared tungsten carbide-based hard alloy decreases due to excessive fast and / or irregular growth of tungsten carbide crystals in the preparation process of the existing tungsten carbide-based hard alloy, and provides a low production cost, Tungsten carbide-based cemented carbide with better performance, and preparation method of such tungsten carbide-based cemented carbide

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