Preparation process of tungsten carbide/inhibitor composite powder and superfine hard alloy thereof

Abstract

The preparation method for WC-inhibitor composite powder and its ultrafine hard alloy comprises: first, preparing oxide powder with carbon and inhibitor; composing the composite powder with direct reducing carbon method; adding metal powder to grind, dry, form, and vacuum sinter or thermal treat after H2 sintering, or low-pressure sintering directly, and obtaining the ultrafine or nano WC-base hard alloy. This invention introduces multiple inhibitors in early stage to overcome the defect in prior art, selects environment-friendly materials and temperature lower than traditional method, and needs low cost fit to industrialization.

Description

technical field

[0001] The invention belongs to a preparation method of tungsten carbide-based ultrafine hard alloy. Background technique

[0002] Ultra-fine-grained tungsten carbide (hereinafter referred to as "WC")-based cemented carbide has the "double high" performance of high strength and high hardness, and can be applied to the production of micro-drills for printed circuit boards, printing needles for dot-matrix printers, precision molds, difficult Processing materials, knives, etc. When the grain size of WC is reduced and the distribution of cobalt in the binder phase is highly uniform, the number and size of defects will be reduced or even zero, and the mechanical properties of the alloy can be much higher than that of ordinary cemented carbide. There are two key processes in the preparation of ultrafine-grained WC-based cemented carbide: one is the preparation of WC or WC-Co raw material powder with fine grains and uniform particle s...

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