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Preparation method of reinforced hard alloy containing WC fiber crystals

A technology of cemented carbide and fiber crystals, which is applied in the field of preparation of cemented carbides containing WC fiber crystals, can solve the problems of low atomic diffusion rate, difficulty in obtaining dense materials, and grain growth, and achieve reasonable process design and high efficiency. Densification performance and the effect of lowering the transition temperature

Inactive Publication Date: 2013-03-13
CHONGQING ACADEMY OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to obtain dense materials when the existing nano-WC powder is sintered. The main reasons are: 1. WC has a high melting point and a low atomic diffusion rate;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Dissolve phosphotungstic acid in deionized water, heat to 60°C, and stir well at the same time to make a saturated aqueous solution of phosphotungstic acid, and cool to room temperature;

[0020] (2) Dissolve cetyltrimethylammonium bromide in deionized water and stir fully at the same time to make a saturated aqueous solution of cetyltrimethylammonium bromide;

[0021] (3) Add the solution obtained in step (2) to the solution obtained in step (1) drop by drop, and stir while adding, gradually a white precipitate is formed. After the dropwise addition is completed, continue to stir for 5 hours until complete precipitation Finally, filter with suction, wash the precipitate with microwave vibration, dry it in vacuum at 70°C, and dry it at a pressure of 7-100 Pa to obtain a white powder;

[0022] (4) Place the white powder obtained in step (3) in Al 2 o 3 Place the crucible in a vacuum drying oven, raise the temperature to 1000°C at a heating rate of 5°C / min, and hold...

Embodiment 2

[0030] (1) Dissolve phosphotungstic acid in deionized water, heat to 60°C, and stir well at the same time to make a saturated aqueous solution of phosphotungstic acid, and cool to room temperature;

[0031] (2) Dissolve cetyltrimethylammonium bromide in deionized water and stir fully at the same time to make a saturated aqueous solution of cetyltrimethylammonium bromide;

[0032] (3) Add the solution obtained in step (2) to the solution obtained in step (1) drop by drop, and stir while adding, gradually a white precipitate is formed. After the dropwise addition is completed, continue to stir for 5 hours until complete precipitation Finally, filter with suction, wash the precipitate with microwave vibration, dry it in vacuum at 70°C, and dry it at a pressure of 7-100 Pa to obtain a white powder;

[0033] (4) Place the white powder obtained in step (3) in Al 2 o 3 Place the crucible in a vacuum drying oven, raise the temperature to 1000°C at a heating rate of 5°C / min, and hold...

Embodiment 3

[0041] (1) Dissolve phosphotungstic acid in deionized water, heat to 80°C, and stir well at the same time to make a saturated aqueous solution of phosphotungstic acid, and cool to room temperature;

[0042] (2) Dissolve cetyltrimethylammonium bromide in deionized water and stir fully at the same time to make a saturated aqueous solution of cetyltrimethylammonium bromide;

[0043] (3) Add the solution obtained in step (2) to the solution obtained in step (1) drop by drop, and stir while adding, gradually a white precipitate is formed. After the dropwise addition is completed, continue to stir for 5 hours until complete precipitation Finally, filter with suction, wash the precipitate with microwave vibration, dry it in vacuum at 70°C, and dry it at a pressure of 7-100 Pa to obtain a white powder;

[0044] (4) Place the white powder obtained in step (3) in Al 2 o 3 Place the crucible in a vacuum drying oven, raise the temperature to 1000°C at a heating rate of 5°C / min, and hold...

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Abstract

The invention discloses a preparation method of a reinforced hard alloy containing WC fiber crystals, which comprises the following steps: (1) preparing nano tungsten carbide fiber crystals; (2) preparing WC fiber-reinforced ultrafine hard alloy composite powder; and (3) adding the prepared WC fiber-reinforced ultrafine hard alloy powder into a forming agent, pressing, and sintering to obtain the reinforced hard alloy containing the WC fiber crystals. According to the invention, the process is reasonable in design; the processing course ensures that WC is effectively coated with Co powder; crystal grains can not grow abnormally when the WC fibers are sintered; the natural form of crystal whiskers can be kept, so that the bending strength of the alloy is greatly increased; the hardness of the alloy can not be reduced, so that the prepared Co also belongs to a nano level, thereby ensuring that the transformation temperature of martensite of the Co powder is reduced; and finally, the face-centered cubic cobalt content and volume in the alloy are increased, so that the bending strength of the alloy is increased, thereby obtaining the hard alloy having high compactness and superior mechanical property.

Description

technical field [0001] The invention relates to a method for preparing cemented carbide, in particular to a preparation method for reinforced cemented carbide containing WC fiber crystals. Background technique [0002] In recent years, the technology of preparing ultra-fine cemented carbide has received extensive attention. The existing technology mainly uses nano-W powder, WC powder, cobalt powder, etc. as raw materials, and adds grain growth inhibitors on the basis. Conventional ball milling, glue mixing, sintering and other processes are used to prepare ultrafine cemented carbide. However, it is difficult to obtain dense materials during sintering of existing nano-WC powders. The main reasons are: 1. WC has a high melting point and low atomic diffusion rate; 20-dimensional nano-powders have a serious tendency of grain growth during sintering. Nanowires and nanosheets with one-dimensional or two-dimensional structures have higher thermodynamic and dimensional stability th...

Claims

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Application Information

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IPC IPC(8): C22C47/02C22C49/14C22C101/12C22C121/00
Inventor 姜爱民蒋显全杨锦李权余荣薛文娟潘复生
Owner CHONGQING ACADEMY OF SCI & TECH
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