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A kind of ultra-coarse cemented carbide and its preparation method

A cemented carbide, ultra-coarse technology, applied in the field of powder metallurgy, can solve the problems of uneven grain size and small grain size, and achieve the effect of uniform particle size, fine particle size, and improved dispersion

Active Publication Date: 2020-08-07
江西江钨硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Excessive wet grinding will cause the grain size to be too small and the grains to be uneven

Method used

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  • A kind of ultra-coarse cemented carbide and its preparation method
  • A kind of ultra-coarse cemented carbide and its preparation method

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preparation example Construction

[0034] The application provides a method for preparing extra-coarse cemented carbide. The raw materials include: 3-5 parts by weight of nanometer tungsten carbide powder with a Fischer particle size of 0.1-0.2 μm, 8-12 parts by weight of binder phase, 0.04- 0.1 parts by weight of additives, the remainder being coarse tungsten carbide powder with a Fischer particle size of 25-35 μm; the total parts by weight of nanometer tungsten carbide powder, binder phase, additive and coarse tungsten carbide powder is 100 parts; raw materials also include 2 parts by weight of molding agent.

[0035] In a preferred embodiment, the forming agent is polyethylene glycol. The bonding phase contains cobalt powder with a Fischer particle size of 1.0 μm and boron powder with a particle size of 0.8-1.0 μm, and the mass ratio of the cobalt powder and the boron powder is 100:0.05-0.1. The additives in the raw material are neodymium oxide and gadolinium oxide, and the mass ratio of neodymium oxide and...

Embodiment 1

[0046] Preparation of cemented carbide, raw materials include: 5g nanometer tungsten carbide powder with a Fischer particle size of 0.1-0.2μm, 10g binder phase, 0.06g additive, 84.94g coarse tungsten carbide powder with a Fischer particle size of 30μm; 2g polyethylene glycol . Wherein, the binder phase is cobalt powder with a Fischer particle size of 1.0 μm and boron powder with a particle size of 0.8 μm, and the mass ratio of cobalt powder and boron powder is 100:0.1. The additives are neodymium oxide and gadolinium oxide with a mass ratio of 1:1.

[0047] The pretreatment method of the nanometer tungsten carbide powder is as follows: the commercially available nanometer tungsten carbide powder is placed in a ball mill for 10 hours and then dried. The specific conditions for ball milling are as follows: the ball-to-material ratio is 15:1, absolute alcohol is used as the ball-milling medium, and the liquid-to-material ratio is 380ml / kg.

[0048] The pretreatment method of th...

Embodiment 2

[0055] Preparation of cemented carbide, raw materials include: 3g nanometer tungsten carbide powder with a Fischer particle size of 0.1-0.2μm, 8g binder phase, 0.04g additive, 88.96g coarse tungsten carbide powder with a Fischer particle size of 25μm; 2g polyethylene glycol . Wherein, the binder phase is cobalt powder with a Fischer particle size of 1.0 μm and boron powder with a particle size of 0.8 μm, and the mass ratio of cobalt powder and boron powder is 100:0.1. The additives are neodymium oxide and gadolinium oxide with a mass ratio of 1:1.

[0056] The pretreatment method of the nanometer tungsten carbide powder is: put the commercially available nanometer tungsten carbide powder into a ball mill for 12 hours, and then dry it. The specific conditions of ball milling are: the ratio of ball to material is 12:1, absolute alcohol is used as the ball milling medium, and the ratio of liquid to material is 350ml / kg.

[0057] The pretreatment method of the coarse tungsten ca...

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Abstract

The invention belongs to the field of powder metallurgy and relates to a preparation method of an extremely-thick hard alloy. Preparation raw materials include, by weight, 3-5 parts of nano tungsten carbide powder, 8-12 parts of a binding phase, 0.04-0.1 part of an additive and the balance coarse tungsten carbide powder; the total parts by weight of the nano tungsten carbide powder, the binding phase, the additive and the coarse tungsten carbide powder is 100; and the raw materials further include a molding agent. The binding phase includes cobalt powder and boron powder, and the additive includes neodymium oxide and gadolinium oxide. According to the hard alloy prepared by using the raw materials, the grain size is 10.5 microns or more, and the HRA hardness is more than 86.0.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and in particular relates to an extra-coarse cemented carbide and a preparation method thereof. Background technique [0002] Coarse-grained tungsten carbide-cobalt cemented carbide is used in the field of mining alloys due to its excellent properties. Its rock-breaking and rock-drilling tools are widely used in full-face tunnel boring machines, coal shearers, high-efficiency road milling machines, advanced hydraulic rock drills, Rock drilling rigs are used more and more widely. The current field of mining alloys puts forward higher requirements for the toughness, wear resistance, hardness, and strength of coarse-grained alloys. Therefore, it is of great significance to further improve the quality of coarse-grained alloys and produce coarse-grained alloys with good hardness and toughness matching. At present, the conventional process flow for preparing coarse-grained cemented carbide in China i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08B22F3/105
CPCB22F3/105B22F2003/1051C22C1/051C22C29/067C22C29/08
Inventor 徐伟郭永忠陈玉柏汤昌仁梁瑜曾程遥程秀容胡梦云
Owner 江西江钨硬质合金有限公司