Double crystal corrosion resistant cemented carbide material and manufacturing method thereof

Abstract

The invention discloses a twinned crystal corrosion-resistant hard alloy material and a method for manufacturing the same. The main compositions of the alloy material are WC composite hard phase, Co as binder metal, Cr as the microelement to resist corrosion and prevent the growth of grain, and the mass percentage compositions are: 20 to 32 percent of 0.8-2u of tungsten carbide powder, 48 to 60 percent of 2-4u tungsten carbide powder, 0.5 to 1 percent of chrome carbide powder, and 12 to 20 percent of cobalt powder. The manufacturing method comprises the steps of ball milling the powder at the matching ratios in alcohol and hexane protection mediums to obtain hard allay mixing material, then pressing the powder into be blanks, and finally sintering the blanks in a sintering furnace under the conditions at a temperature of between 1380 and 1420 DEG C for heat preservation for 40 to 80 minutes. The twinned crystal corrosion-resistant hard alloy material has wear-resistance, impact-resistance and stable quality, and the manufacturing method is simple and reliable.

Description

technical field [0001] The invention relates to a hard alloy material, in particular to a twin-crystal corrosion-resistant hard alloy material, and also relates to a manufacturing method of the twin-crystal corrosion-resistant hard alloy material. Background technique [0002] At present, the main grades of cemented carbide plates are YG15, YG20, etc. In the production process of these grades, WC powder of a single specification is used for production. The disadvantage of a single powder is that it cannot make the material have the characteristics of high strength and high hardness at the same time. That is to say, the product cannot have the characteristics of wear resistance and impact resistance at the same time; while the bonding component is only one element of cobalt, but the oxidation resistance and corrosion resistance of cobalt are poor, which makes the plate prone to corrosion in wire cutting and EDM And defects such as cracks; at the same time, at high temperature...

AI Technical Summary

Problems solved by technology

[0002] At present, the main grades of cemented carbide plates are YG15, YG20, etc. In the production process of these grades, WC powder of a single specification is used for production. The disadvantage of a single powder is that it cannot make the material have the characteristics of high strength and high hardness at the same time. That is to say, the product cannot have the characteristics of wear resistance and impact resistance at the same time; while the bonding component is only one element of cobalt, but the oxidation resistance and corrosion resistance of cobalt are poor, which makes the plate prone to corrosion in wire cutting and EDM And defects such as cracks; at the same time, at high temperature, WC grains dissolve in liquid cobalt, which easily leads to abnormal growth of WC grains

With the expansion of the use range of cemented carbide plates and its application in various environments, traditional cemented carbide can no longer adapt to the increasingly complex and changeable working environment