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Preparation process of cemented carbide material

A cemented carbide and preparation process technology, applied in the field of cemented carbide material preparation, can solve problems such as insufficient hardness and strength, achieve high hardness and strength, and improve mechanical activity.

Inactive Publication Date: 2016-12-07
柳州增程材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of WC-Co alloy can adopt lamination method, sintering and other processes. The WC grains of WC-Co cemented carbide prepared by these processes are continuously distributed, and the alloy with Co phase gradient has a fine grain side with Higher hardness, the coarse-grain side has a certain bending strength; during sintering, the Co phase migrates from the coarse-grain side to the fine-grain side, and its hardness and strength are not enough

Method used

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preparation example Construction

[0019] A kind of preparation technology of cemented carbide material, it comprises the following steps:

[0020] WC and Co particles are used as raw materials, and the content of Co is 5-10wt%; then the WC particles and Co particles are cleaned separately to remove surface impurities; the cleaned WC particles and Co are crushed into powder particles; The above-mentioned powder particles are mixed uniformly in a mixer and then ground to obtain alloy powder. Put the above alloy powder in a graphite mold for hot-press sintering, unload the mold after sintering to obtain cemented carbide material; hot-press sintering is carried out in three stages, first sintering at a temperature of 280-320°C for 20-30s, and then Sintering at -600°C for 40-60s, and then sintering at 650-700°C for 20-30s; the first stage belongs to the sintering preparation stage for further sintering to purify the environment; The sintering necks are formed between the particles and combined with each other, the...

Embodiment 1

[0024] Wash 95wt% WC grains and 5wt% Co grains separately to remove surface impurities; grind the cleaned WC grains and Co grains into powders; then mix the above powders in a mixer evenly and grind them to obtain alloy powder; place the alloy powder in a graphite mold, first sinter at 280°C for 30s, then sinter at 500°C for 60s, and then sinter at 650°C for 30s; then solid solution treatment at 650°C for 12min; then cold pressing deformation treatment , the cold deformation is 30%; finally, aging treatment at 300℃ for 3h, to obtain WC-Co cemented carbide material. The measured hardness of the material is 51.2HRC, and the shear strength is 601.6MPa.

Embodiment 2

[0026] Wash 92wt% WC grains and 8wt% Co grains separately to remove surface impurities; grind the cleaned WC grains and Co grains into powders respectively; then mix the above powders in a mixer and grind them to obtain alloy powder; place the alloy powder in a graphite mold, first sinter at 300°C for 25s, then sinter at 560°C for 50s, and then sinter at 680°C for 25s; then solid solution treatment at 680°C for 11 minutes; then cold pressing deformation treatment , the cold deformation is 32%; finally, aging treatment at 330℃ for 2.5h, to obtain WC-Co cemented carbide material. The measured hardness of the material is 66.7HRC, and the shear strength is 685.4MPa.

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Abstract

The invention relates to a preparation process of a cemented carbide material. The preparation process comprises the following steps: cleaning WC particles and Co particles to remove impurities on the surfaces; crushing the cleaned WC particles and Co particles into powder, and uniformly mixing the powder in a mixer, and then grinding to obtain alloy powder; placing the alloy powder in a graphite mold, performing hot-press sintering, and unloading the mold after finish of sintering to obtain cemented carbide; and performing heat treatment on the cemented carbide. According to the preparation process, the impurities on the surface of metal powder can be removed through the cleaning process, so that the purity of alloy prepared later is improved; the mechanical activity of the powder can be improved through mixing and grinding, so that a better foundation is provided for close combination of the alloy; and the WC-Co alloy powder is subjected to hot-press sintering and heat treatment to acquire the cemented carbide material with high hardness and strength.

Description

technical field [0001] The invention relates to a preparation process of cemented carbide materials. Background technique [0002] The amount of cemented carbide used in mining, coal and oil drilling is very large. Due to technical limitations, these cemented carbide tools for rock drilling have changed little over the years, and these changes are nothing more than controlling the purity of the alloy and the composition of the binder phase. Wait. At present, cemented carbide tools for mining mainly use WC-Co alloy. In general, the alloy composition of percussion drill bits for drilling, coal mining and asphalt cutting is WC and 6-11% Co, and the alloys for different purposes, because some properties are improved, other properties are reduced. For example, high wear-resistant alloys usually have poor toughness, on the contrary, alloys with good toughness have poor wear resistance. Reducing the Co content and increasing the hardness can reduce the wear of the alloy, while i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05B22F3/14B22F3/24
CPCC22C29/08B22F3/14B22F3/24B22F2003/248B22F2998/10C22C1/051B22F2009/041
Inventor 李祥明田源李贤良
Owner 柳州增程材料科技有限公司
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