Method for preparing high strength cemented carbide

A cemented carbide, high-strength technology, applied in the field of cemented carbide, can solve the problems of difficult recycling, easy volatility, and high procurement costs

Inactive Publication Date: 2009-01-07
HUNAN CENTURY SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The hardness of cemented carbide has a lot to do with the molding agent selected. The grinding medium chosen by most cemented carbide manufacturers is alcohol and

Method used

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  • Method for preparing high strength cemented carbide
  • Method for preparing high strength cemented carbide

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Embodiment Construction

[0012] A preparation method of high-strength cemented carbide, including batching, wet grinding, adding molding agent and then wet grinding, drying, crushing, pre-pressing, passing through a 40-mesh sieve, granulating, compression molding, sintering dewaxing, passivation and other processes Step: When batching, the weight content of metal cobalt powder in the raw material components is 6-16%, and the rest is tungsten carbide with two different particle sizes. 7μm, the average particle size of fine tungsten carbide is 1-1.5μm; the weight content of tungsten carbide with two different particle sizes is: the ratio of coarse and fine tungsten carbide is 0.55-3.6:1; when wet grinding, the ball-to-material ratio is 3.25-3.5: 1. Add acetone as the grinding medium according to the solid-to-liquid ratio of 3-3.5:1, the grinding time is 20-28 hours, the speed of the ball mill is 25-29r / min; when wet grinding, add liquid paraffin at 60-80°C as a molding agent, and Liquid paraffin with a ...

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Abstract

The invention relates to a preparation method for a hard alloy with high intensity which includes: during re-wetmilling, adding the liquid paraffin with the temperature of 60 to 80 DEG C as a shaping agent; adding the liquid paraffin with a purity of 99.5 percent with a liquid-solid ratio of 10 to 30ml/Kg. The hot water with the temperature of 55 to 80 DEG C is pumped into the jacket of a wetmilling machine; a heat preservation barrel is also used for transferring the slurry of materials. In the invention, as the paraffin is used as the shaping agent and a special method is adopted to add the shaping agent, acetone is added as a wetmilling medium; compared with other mediums, the method of the invention not only is economic, but also has a good effect; the thick and thin tungsten carbide with two different average granularities are adopted to prepare the hard alloy with a bimodal structure; the thick particles ensure the toughness of the alloy; the thin particles then can improve the wear-resistance of the alloy; a working procedure of pre-pressing is increased to improve the pelletization performance thereof; a low-pressure sintering technique is adopted; different atmospheres and pressures in a furnace are adopted according to the different steps of the sintering process, thus ensuring the intensity of a product.

Description

technical field [0001] The invention belongs to the technical field of cemented carbide, and particularly relates to a method for preparing high-strength cemented carbide. The products produced by the method can meet the requirements of cemented carbide buttons and cemented carbide composite sheets, so as to meet the requirements of down-the-hole drills, To meet the special needs of roller cone bits, diamond bits and other tools, improve product quality, and reduce product production costs. Background technique [0002] The hardness of cemented carbide has a lot to do with the molding agent selected. The grinding medium chosen by most cemented carbide manufacturers is alcohol and hexane, but because alcohol contains water, it is easy to make the product dirty ; The purchase cost of hexane is too high, and it is volatile and difficult to recycle. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of the p...

Claims

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Application Information

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IPC IPC(8): C22C1/04B22F3/12B22F9/04C22C1/05C22C29/08
Inventor 单水桃肖华王小平
Owner HUNAN CENTURY SPECIAL ALLOY
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