The invention relates to cemented carbide products and spraying powder for casting tungsten carbide, including cast tungsten carbide greater than or equal to 50wt% and less than 100wt% and bonded metals greater than 0wt% and less than or equal to 50wt%. As the cast tungsten carbide has high strength and excellent wear resistance, the cemented carbide and WC spraying powder of the invention have higher hardness and wear resistance.

At present, due to the small average particle size and high hardness of ordinary tungsten carbide (WC) and its high hardness and melting point, ordinary tungsten carbide is usually used as the main raw material to manufacture cemented carbide products and spraying powder, which are used for cutting tools, spark plugs, engine coatings and other products requiring high hardness and excellent wear resistance. With the further improvement of product hardness and wear resistance, new cemented carbide products and spraying powder are needed.

The object of the invention is to provide a high hardness cemented carbide product and a spray powder with excellent wear resistance.

According to one aspect of the present invention, a cemented carbide product is provided. The cemented carbide product includes cast tungsten carbide greater than or equal to 50wt% and less than IOOwt% and bonded metals greater than and less than 50wt%.

Among them, based on the total weight of the cemented carbide products, the content of the cast tungsten carbide is preferably 70 94 wt%.

The average particle size of the cast tungsten carbide used to form the cemented carbide product is 5.

Among them, the bonding metal includes at least one selected from Co, Ni, Cr, Fe and Cu.

According to one aspect of the present invention, a spray powder is provided, which comprises cast tungsten carbide with a content greater than or equal to 50wt% and less than 100 lining% and bonded metal with a content greater than 0wt% and less than or equal to 50wt%.

Based on the total weight of WC spraying powder, the content of the cast tungsten carbide is optimized to be 70 94 wt%.

The average particle size of the cast tungsten carbide used to form the spraying powder is less than 5.

Among them, the bonding metal includes at least one selected from Co, Ni, Cr, Fe and Cu.

According to the present invention, cast tungsten carbide powder is used instead of conventional tungsten carbide in traditional cemented carbide. Because cast tungsten carbide is eutectic structure (WC-W2C molecular formula), it has higher hardness and wear resistance, especially when fine-grained cast tungsten carbide powder is used, such as cast tungsten carbide powder with average particle size less than 5 micron, thus high hardness cast tungsten carbide can be provided. Products and cast tungsten carbide spraying powder with excellent wear resistance. In addition, the production process of cast tungsten carbide carbide products and cast tungsten carbide spraying powder is simple and feasible, with remarkable economic benefits.

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