Preparation method of ultra-wear-resistance hard alloy

Abstract

The invention discloses a preparation method of a ultra-wear-resistance binder-free hard alloy, and belongs to the technical field of powder metallurgy. The preparation method comprises the following preparation steps: (1) nanometer WC powder of not more than 100 nm is mixed with micron WC powder of 2-4 microns through ball milling, wherein the nanometer WC powder is 8-12% of the total WC powder; the nanmeter WC powder is pure WC powder; and the micron WC powder is WC powder containing a grain growth inhibitor, 0.5 wt% of Cr3C2 and 0.5 wt% of VC; and (2) the ball-milled mixed powder is put in a graphite mold for hot-pressed sintering; the sintering temperature is 1500-1600 DEG C; the sintering pressure is 30-40 MPa; and the sintering time is 20-30 min. Compared with a traditional preparation process, as the nanometer WC powder is adopted, and is higher in sintering activity, micron WC particles are sintered at a lower temperature through a recrystallization growth mode. The grain growth inhibitor is added in the micron WC powder, so that the grain size of the whole alloy can be controlled, the comprehensive mechanical performance of the alloy is improved, and finally, the wear resistance is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy and provides a preparation method of super wear-resistant cemented carbide. Background technique [0002] Cemented carbide is an efficient tool material. Because of its high strength, high toughness, high wear resistance and a series of excellent characteristics, it plays a pivotal role in the world's industrial development. It is used in machinery manufacturing, mining, and oil extraction. Various important industries of the national economy such as transportation, coal, electrical appliances, and electronics occupy extremely important positions and are known as "the teeth of industry". WC-Co cemented carbide includes a hard phase (WC) and a binder phase (iron group metals). In certain harsh environments, these binder phases are more likely to corrode and oxidize than the hard phase, resulting in problems in some fields. Applications are subject to certain restrictions. The emergence ...

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Problems solved by technology

However, the sintering temperature of these sintering technologies is still high, reaching above 1600°C, the sintering cost is high, and the large-scale production efficiency is low