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Microwave sintering method for hard alloy

A microwave sintering and cemented carbide technology, which is applied in the field of fine-grained cemented carbide and low cobalt content, can solve the problems of complex process, failure to achieve a good degree of cooperation, high cost, etc., and achieve the effect of firm bonding

Inactive Publication Date: 2014-12-10
冯冬维
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above processing methods are either complex in process and expensive in cost; or they do not achieve the desired degree of good cooperation between strength and toughness

Method used

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  • Microwave sintering method for hard alloy
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Effect test

Embodiment 1

[0027] The surface layer of hard alloy on the tip of the tooth contains 5% cobalt, and the rest is composed of tungsten carbide and a very small amount of unavoidable impurities. The particle size of tungsten carbide is 0.8μm; the matrix cemented carbide contains 10% cobalt, and the rest is tungsten carbide and a very small amount of unavoidable impurities. The particle size of tungsten carbide is 1μm, 2μm and 3μm respectively, and its weight ratio is: 1μm: 2μm: 3μm = 30%: 30%: 40%. After powder mixing, the two powders are ball milled, dealcoholized, glued, and granulated , Pressed into a tapered tooth blank with a composite layer, the thickness of the surface layer is controlled within 1-5mm, and then microwave sintered. The process is a three-stage continuous sintering process: three stages of degreasing, redox and final densification are carried out continuously. The control conditions of the degreasing stage are: nitrogen protection, pressure: 3*10 3 ~20Pa; heating rate:...

Embodiment 2

[0029] The surface layer of cemented carbide on the tooth tip contains 6% cobalt, and the rest is composed of tungsten carbide and a very small amount of unavoidable impurities. The particle size of tungsten carbide is 0.7μm; the matrix cemented carbide contains 7% cobalt, and the rest is tungsten carbide and a very small amount of unavoidable impurities. The particle sizes of tungsten carbide are 1μm, 2μm and 3μm respectively, and the weight ratio is: 1μm:2μm:3μm=30%:30%:40%. After powder mixing, the two powders are ball milled, dealcoholized, glued, and granulated , Pressed into a tapered tooth blank with a composite layer, the thickness of the surface layer is controlled within 1-5mm, degreased in a degreasing furnace, and then microwave sintered. The process is as follows: nitrogen gas protection, pressure: 3*10 3 ~20Pa; heating rate: 15°C / min, from room temperature to 550°C; heat preservation at 550°C for 10 minutes; then heat up to 1080°C at a rate of 15°C / min; heat pre...

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Abstract

The invention relates to a microwave sintering method for hard alloy. The microwave sintering method comprises the three stages of degreasing, oxidation-reduction and final densification. The microwave sintering method has the advantages that fine tungsten carbide particles cannot become larger or are not prone to becoming larger, namely, ultra refinement can be achieved, and strength and toughness of the hard alloy are facilitated; there is no enough time to remotely diffuse cobalt in an alloy matrix, namely, there is no enough time to diffuse the high-content cobalt in the core of the matrix into a surface layer, and therefore the gradient feature of the hard alloy is well kept; due to the plasma heating effect of microwave sintering, a junction surface cannot crack, a good transition layer is formed between the core and the surface layer, and the core and the surface layer are combined very firmly; the alloy obtained through microwave sintering is high in density and low in porosity.

Description

technical field [0001] The technology of the present invention belongs to the field of cemented carbide manufacturing, and relates to a microwave sintering method for cemented carbide, in particular to a cemented carbide for rock drilling (brazing) bits, through microwave sintering, so that the tooth surface has a Cemented carbide with low cobalt content and fine particles with high hardness and high wear resistance; hard alloy with high toughness, high cobalt content and coarser particles in the center of the matrix. Background technique [0002] There is a sharp contradiction between the hardness and strength, toughness and wear resistance of cemented carbide, and it is difficult to improve at the same time. At the end of the last century, many scientists devoted themselves to the research of gradient materials and solved this problem better. In the field of cemented carbide, many scientists have also done a lot of work and made great progress. For example, at the end of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/08B22F3/10C22C29/08
Inventor 冯冬维姚立凤
Owner 冯冬维
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