A kind of preparation method of cemented carbide product

A technology of cemented carbide and products, which is applied in the field of cemented carbide preparation, can solve the problems of grain size growth, low density, and grain boundary weakening, so as to strengthen the grain boundary strength, prevent raw material oxidation, and purify the grain boundary. Effect

Active Publication Date: 2017-04-19
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to reduce the phenomenon of decarburization and grain boundary weakening of the alloy due to the increase of the oxygen content that occurs in the preparation of large-sized and fine-grained products in the existing cemented carbide production process, and overcome the high residual porosity, Low density, abnormal growth of grain size and other defects that affect material strength and other properties, thus providing a large-sized product with high density, uniform microstructure, and greatly improved transverse fracture strength and hardness, especially high Carbide large size anvils with long service life

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  • A kind of preparation method of cemented carbide product
  • A kind of preparation method of cemented carbide product
  • A kind of preparation method of cemented carbide product

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0039] Such as figure 1 As shown, the present embodiment provides a preparation process of a cemented carbide anvil, including the following steps in sequence:

[0040] S1: Put the mixed powder into the ball mill first, the mixed powder includes the following components in weight percentage: 89% of WC, 10.5% of Co, 0.2% of Mo, 0.01% of Y(NO3) 3 , the balance is VC and Cr 3 C 2 , the particle size of WC powder is 0.3 μm, the particle size of Co powder is 0.4 μm, and then mixed with paraffin wax with a weight of 2% of the mixed powder to make it wrap around the Co particles to prevent oxidation, and add absolute ethanol for ball milling , the ball milling time is 48 hours, the ball milling ambient temperature is a low temperature environment of -5°C to prevent the oxidation of raw materials, and vacuum stirring is used to dry after ball milling to make the paraffin wax evenly mixed;

[0041] S2: putting the mixed powder after ball milling into a mold for molding to form a work...

Embodiment 2

[0050] This embodiment provides a preparation process for a cemented carbide anvil, including the following steps in sequence:

[0051] S1: Put the mixed powder into the ball mill first, the mixed powder includes the following components in weight percentage: 91.2% of WC, 8.5% of Co, 0.1% of Mo, 0.02% of Y(NO3) 3 , the balance is VC and Cr 3 C 2 , the particle size of WC powder is 0.4 μm, the particle size of Co powder is 0.5 μm, and then mixed with paraffin wax with a weight of 1.5% of the mixed powder to wrap it around the Co particles to prevent oxidation, and add absolute ethanol for ball milling , the ball milling time is 54 hours, the ball milling ambient temperature is a low temperature environment of -2°C to prevent the oxidation of raw materials, and vacuum stirring is used to dry after ball milling to make the paraffin wax evenly mixed;

[0052] S2: putting the ball-milled mixed powder into a mold for molding to form a workpiece compact, and the molding pressure is...

Embodiment 3

[0061] This embodiment provides a preparation process for a cemented carbide anvil, including the following steps in sequence:

[0062] S1: Put the mixed powder into the ball mill first, the mixed powder includes the following components in weight percentage: 90% of WC, 9.4% of Co, 0.4% of Mo, 0.03% of Y(NO3) 3 , the balance is VC and Cr 3 C 2 , the particle size of WC powder is 0.5 μm, the particle size of Co powder is 0.6 μm, and then mixed with paraffin wax with a weight of 2.3% of the mixed powder to make it wrap around the Co particles to prevent oxidation, and add absolute ethanol for ball milling , the ball milling time is 55h, and the ball milling environment temperature is a low temperature environment of -1°C to prevent the oxidation of raw materials. After the ball milling, vacuum stirring and drying are used to make the paraffin wax evenly mixed;

[0063] S2: putting the mixed powder after ball milling into a mold for molding to form a workpiece compact, and the ...

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Abstract

The invention provides a preparation method for a cemented carbide product. According to the preparation method, ultrafine mixed powder with specific components is adopted; a trace amount of metal Mo element is added to increase wettability and heat conductivity of the alloy; a trace amount of Y(NO)3 is added to play a purifying effect; and a trace amount of VC and Cr3C2 is added as a grain growth inhibitor to inhibit the growth of grains. On the premise of meeting the proportion relationships limited by the invention, the mixed powder is successively subjected to process steps of compression molding, isostatic cool pressing, atmosphere dewaxing, vacuum sintering and hot isostatic pressing, thereby effectively eliminating residual pores in the cemented carbide product, improving texture structure of the material and increasing properties of the material. The strength, hardness and service life of a finally produced cemented carbide product, particularly a large size cemented carbide holding-up hammer, are greatly increased.

Description

technical field [0001] The invention relates to a method for preparing fine-grained hard alloy products and a hard alloy anvil prepared by the method, in particular to a method for preparing a large-size submicron hard alloy anvil, which belongs to the technical field of hard alloy preparation . Background technique [0002] Cemented carbide is known as "industrial teeth". It is used to manufacture cutting tools, knives, molds and wear-resistant parts. It is widely used in military industry, aerospace, machining, metallurgy, oil drilling, mining tools, electronic communications, construction, etc. field. At present, the market demand for cemented carbide is increasing, and WC-based cemented carbide is widely used. With the refinement of WC grains, the mechanical properties of the material can be greatly improved. However, there are three technical difficulties in the preparation of ultra-fine WC-based cemented carbide: first, the ultra-fine powder is easy to increase oxyg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08C21D1/30
Inventor 陈飞雄刘文彬熊宁姚惠龙颜君毅陈福鸽王铁军刘国辉
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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