Hard alloy and double-metal composite technique and device

Abstract

The utility model relates to a composite art and apparatus for hard alloy and bimetal, wherein the hard alloy is made of C with the content from 1.5 to 3.8 percent, Cr with the content from 15 to 27 percent, high chromium foundry iron with the content Fe used as binder, WC or TIC particles by the powder metallurgy technique, wherein the C and Cr are both accounted for 10-40 percent, the rest is the high chromium foundry iron, the WC or the TIC has the content from 90 to 60 percent. The hard alloy proceed composite casting with the C with the content from 1.5 to 3.8 percent, the Cr with the content from 15 to 25 percent, the rest high chromium foundry iron and spheroidal graphite cast iron in the mould provided with an electro-magnetism induction heater outside. The recombination of two materials is achieved by directly heating to the hard alloy and base metal liquid via the induction heater in the process of casting. The hard alloy produced by the invention has better wetting property and less bulking difference to the base metal, and is capable of achieving good recombination with the base metal. The invention has the advantages of simple recombination technique, easy achievement of technique, good property of the recombination products and low manufacturing costs.

Description

technical field [0001] The invention relates to cemented carbide and its composite material, in particular to a cemented carbide containing Fe, Ni, Cr, Mo, Co and other alloys as binders and its bimetallic composite material manufacturing process and equipment. Background technique [0002] As a high wear-resistant material, cemented carbide is widely used in cutting tools, molds, chisels, geological drilling and metallurgical rolls due to its high hardness, high strength and high wear resistance. field. Traditional cemented carbide is made of cobalt as a binder and manufactured by powder metallurgy sintering process. Cobalt is a scarce strategic material with a high price. In recent years, due to the development of world industry, the demand for cobalt has been increasing, resulting in a global shortage of cobalt, and the price of cobalt has skyrocketed, causing the price of cemented carbide with cobalt as the main raw material to also rise sharply. The price of already ...

AI Technical Summary

Problems solved by technology

According to the principle of inlay casting, if a metallurgical bonding layer is to be formed between two materials, the inlay casting ratio must be greater than 10. When the inlay casting ratio is less than 10, the composite interface will not be able to form a complete metallurgical bonding layer, thus limiting the application field.

The cemented carbide currently used all uses a large amount of cobalt as a binder or adds some nickel and chromium to the binder, which makes the price of the cemented carbide expensive, and there is also a cemented carbide matrix WC and matrix steel ( The wettability of iron) is poor, the linear expansion coefficient difference between the two materials is large, and the bonding interface between the two materials cannot be fully fused during manufacturing.

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