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Method for preparing WC-Co series nano composite hard alloy powder

A cemented carbide and nano-composite technology is applied in the field of ultrafine WC-Co series cemented carbide powder preparation to achieve the effects of improving surface energy, high processing efficiency and good industrial application prospects

Active Publication Date: 2008-05-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, there is currently no method for preparing WC-Co nanocomposite cemented carbide powders using corona discharge plasma combined with an auxiliary high-energy ball mill.

Method used

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  • Method for preparing WC-Co series nano composite hard alloy powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, preparation of WC-20Co nanocomposite cemented carbide powder:

[0029] Using the above-mentioned corona discharge plasma-assisted high-energy ball mill, the total volume of selected balls accounts for 75% of the volume of the ball mill tank, wherein the number of balls with a diameter of 22mm accounts for 15% of the total number of balls, and the number of balls with a diameter of 18mm accounts for 75% of the total volume of the ball mill. 75% of the number of grinding balls, the number of grinding balls with a diameter of 10mm accounts for 10% of the total number of grinding balls, and the loose volume of W, C, and Co raw materials to be processed accounts for 130% of the gap between the grinding balls.

[0030] Preparation of WC-20Co nanocomposite cemented carbide powder comprises the following steps:

[0031] (1) Install the front cover plate and electrode rod of the ball milling tank, and connect the ball milling tank and electrode rod to the positive ...

Embodiment 2

[0036] Embodiment 2, preparation of WC-10Co nanocomposite cemented carbide powder:

[0037] Using the above-mentioned corona discharge plasma-assisted high-energy ball mill, the total volume of the selected balls accounts for 70% of the volume of the ball mill tank, wherein the number of balls with a diameter of 20mm accounts for 10% of the total number of balls, and the number of balls with a diameter of 15mm accounts for 70% of the total volume of the ball mill. 80% of the number of grinding balls, the number of grinding balls with a diameter of 10mm accounts for 10% of the total number of grinding balls, and the loose volume of W, C, and Co raw materials to be processed accounts for 60% of the gap between the grinding balls.

[0038] Preparation of WC-10Co nanocomposite cemented carbide powder comprises the following steps:

[0039] (1) Install the front cover plate and electrode rod of the ball milling tank, and connect the ball milling tank and electrode rod to the positi...

Embodiment 3

[0044] Embodiment 3, preparation of pure WC nanocomposite cemented carbide powder:

[0045] Using the above-mentioned corona discharge plasma assisted high-energy ball mill, the process conditions for processing W, C, and Co are basically the same as those for preparing WC-20Co cemented carbide. The atomic ratio of the high-quality alloy components is added, in which 5% of carbon is added, and Co is not added at this time; the gas medium to be filled is N2; the voltage of the plasma power supply is 10KV, and the frequency is 5KHz; the synthesis temperature is 1100°C, and the pressure of the heat source is 0.1 MPa. The product is pure WC nanocomposite cemented carbide powder.

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Abstract

The invention provides a preparation method of WC-Co series nano-composite hard alloy powder, which includes: installing the front cover plate and electrode rod of the ball mill tank, and connecting the front cover plate and electrode rod to the two poles of the plasma power supply respectively ; Put grinding balls and a certain proportion of W, C, Co raw materials in the ball milling tank, and when the electrode rod contacts the grinding balls and W, C, Co raw materials, cover the rear cover of the ball milling tank; pass the vacuum valve Vacuum the closed ball mill tank to 0.01-0.1Pa, or pass the discharge gas medium through the vacuum valve until the pressure is 0.01-0.1MPa; turn on the plasma power supply, according to the discharge gas medium and its pressure Adjust the discharge parameters and carry out different types of corona discharge plasma high-energy ball milling; take out the mixed powder of W, C, and Co, place it in a heat source environment for synthesis reaction, and obtain the corresponding cemented carbide. The invention can not only save energy, but also improve synthesis efficiency.

Description

technical field [0001] The invention relates to the field of preparation of ultrafine WC-Co series cemented carbide powder, in particular to a preparation method of WC-Co series nano-composite cemented carbide powder. Background technique [0002] WC-Co series cemented carbide is the earliest and most mature cemented carbide. So far, WC-Co-based cemented carbide is still the most important part of the cemented carbide field. Therefore, the research on WC-Co-based cemented carbide has an important impact on the entire cemented carbide industry. With the development of modern industry, cemented carbide is also developing in the direction of high strength and high hardness (double high), and scientific researchers have accordingly proposed a way to achieve this goal by using ultra-fine or even nano-sized . At the same time, with the increasing awareness of energy saving in the international community and the promulgation of relevant legal measures, the preparation of WC-Co-ba...

Claims

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Application Information

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IPC IPC(8): B22F9/04C22C1/04
Inventor 朱敏顾南山靳磊戴乐阳曾美琴欧阳柳章
Owner SOUTH CHINA UNIV OF TECH
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