Tungsten Carbide Recycling from Waste Tungsten Cobalt Alloy

The preparation of high quality cemented carbide has strict requirements for the grain size of tungsten carbide powder, which not only requires the microstructure of WC powder well, the crystallization is complete, the granularity is coarse and uniform, but the degree of aggregation can not be too high. This is also the reason why there are few high quality coarse grained cemented carbides made from recycled tungsten in China.

In order to overcome the above shortcomings of the existing technology, some scholars have provided a preparation method for making coarse crystal cemented carbide cutting teeth by using waste tungsten cobalt alloy. It is made of waste tungsten and cobalt alloy by high temperature calcination, crushing, ball milling, screening, batching, wet grinding, drying, forming agent, granulating, pressing molding, vacuum and low pressure integrated sintering.

With the waste tungsten cobalt hard alloy as raw material, after vacuum high temperature treatment at 1800°C, after initial crushing, it is loaded into ball mill and crushed by ball mill. After crushing, the material is screened for 180 purposes. The quality ratio of cobalt and tungsten carbide is 1:9, wet grinding, drying, and formative agent in cobalt and tungsten carbide. Pelletizing, pressing molding and vacuum low pressure integrated sintering. In the process of sintering, the carbon content of the alloy was corrected by the positive carbon sintering process of mixing methane and hydrogen mass ratio of 2.0:98.0 at 1000°C for 70 minutes. The carbon content of the hard alloy produced by WC was balanced, and the maximum temperature of the vacuum low pressure integrated sintering was 1450°C.

The WC average grain size of the cemented carbide prepared by this method is 3 ~ 4.6μm, the bending strength is 3000~3600MPa and the hardness HRA is 87.5 ～90. The alloy strength and microhardness can be well matched, and the hard alloy products have reached a high level of wear resistance and toughness, and the comprehensive performance of the alloy is improved. 

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