Method for preparing quinary P-type hard alloy

Abstract

The invention relates to a method for preparing a quinary P-type hard alloy. The quinary P-type hard alloy consists of the following components in percentage by weight: 16 percent of hard-phase titanium carbide, 8 percent of tantalum carbide, 6 percent of niobium carbide, 10 percent of cobalt, 0.006 percent of lanthanum, and the balance of hard-phase tungsten carbide. The preparation method comprises the following steps: mixing the components, wet-milling the mixture by a tilting wet mill, and discharging the mixture after wet-milling; and waxing and pelletizing the mixture through spray drying, pressing the mixture to form a shape by an automatic press, sintering the mixture in vacuum, and tempering the mixture to obtain a sintered finished product. The product prepared by the method has high bending strength, good impact strength and good red hardness; and when the product is coarsely processed into a large-size alloy forged piece, a cutter is not driven during use, the processing efficiency can be properly improved, and the service life of the cutter is long.

Description

(1) Technical field [0001] The invention relates to a preparation method of a five-element P-type hard alloy. (2) Background technology [0002] Large alloy steel forgings such as heavy equipment such as hydropower, thermal power, nuclear power, petroleum cracking and coal liquefaction. Due to the large amount of rough machining and difficult machining of large alloy forgings, it is the bottleneck of the heavy equipment manufacturing industry. The bottleneck in the processing of heavy equipment is mainly caused by the following characteristics: First, the rough casting of large alloy steel forgings needs to be completed. It is free-forged on a large hydraulic press. The weight of a single piece is dozens of tons or hundreds of tons. The forging accuracy cannot be compared with small forgings. Not only its cutting allowance is large, but the surface is uneven, so large alloy steel The cutting workload of forgings is very large. Second, during the natural slow cooling process of la...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the prior art, hard alloy rough machining large steel forgings is easy to hit the knife, the efficiency is low and the tool life is short, and a kind of preparation method of 5-element P type hard alloy is provided, the prepared The product not only has high bending strength and impact resistance, but also has ideal tool life, and can also improve processing efficiency, thus solving the problem of rough machining of large alloy steel forgings and the bottleneck problem of improving efficiency in the heavy machinery industry

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