A method for preparing cemented carbide with stability control

Abstract

The invention provides a method for preparing hard alloy through stability regulation and control and belongs to the technical field of hard alloy material and powder metallurgy. The method includes the steps that firstly, round hard alloy bars are prepared, the two round hard alloy bars are taken and are vertical up and down, the ends of the two round hard alloy bars are adjacent, and the two round hard alloy bars are sequentially arranged in a vertical floating region of a zone melting furnace and vacuumized; the operating power is set to be 60%-95% of the total power, the power is increased to the set power within 20-30 minutes, after the contact ends of the round hard alloy bars form the beam-shaped stable molten state, the round hard alloy bar on the lower side descends, and the round hard alloy bar on the upper side descends synchronously till the round hard alloy bar on the upper side is taken out and serves as the hard alloy bar obtained after zone melting; and the hard alloy bar obtained after zone melting is arranged in a vacuum heat treatment furnace or a carbonizing oven, the carbonization atmosphere such as methane or carbon monoxide is injected, heat is preserved for 1-3 hours at the temperature ranging from 900 DEG C to 1,100 DEG C, the hard alloy bar is cooled to the room temperature along with the furnace, and then a super-coarse grain hard alloy bar is obtained. The super-coarse grain hard alloy with the excellent performance can be prepared.

Description

technical field [0001] The invention relates to a method for preparing cemented carbide with stability control, belonging to the technical field of cemented carbide materials and powder metallurgy. Background technique [0002] WC-Co cemented carbide has always been the hard material with the best performance and the greatest application benefit in the field of cemented carbide, which once caused a revolution in tool and mold materials in the world. According to the average grain size of WC, WC-Co cemented carbide is usually divided into several grades. Generally, alloys with an average WC grain size greater than 6 microns are called ultra-coarse-grained cemented carbides. Compared with traditional cemented carbide with an average WC grain size of 1-2 microns, ultra-coarse-grained cemented carbide has the following performance advantages: high impact toughness, with the increase of WC grain size in cemented carbide, Impact toughness and fracture toughness are significantly...

AI Technical Summary

Problems solved by technology

Although these methods can produce coarse-grained WC powder, the process of mixing coarse-grained WC and Co powder before sintering is very easy to cause the coarse particles and their internal WC grains to break, and some grains grow abnormally during sintering. , and the difficulty of uniform distribution of the Co phase during the sintering process, etc.

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