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Simple fast preparing process of superfine WC-Co composite powder

A composite powder and rapid technology, which is applied in the field of ultra-fine or nano-level powder preparation, can solve the problems of powder product particle size, particle size uniformity and dispersion, high technical requirements for operators, and cumbersome process, etc., to achieve simplification The effect of production equipment, simplified process route, and reduced reaction temperature

Inactive Publication Date: 2007-06-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The process in the above method is quite tedious (a complete production process generally takes a week), the equipment is complicated, and the technical difficulties such as rotary kiln or fluidized bed process, atmosphere control, gas phase reduction and carbonization temperature, and compound salt preparation are relatively large. The technical level of personnel is high, and the production process cost is very high
Moreover, after multiple high-temperature treatments, it is difficult to control the particle size, particle size uniformity, and degree of dispersion of the final powder product.

Method used

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  • Simple fast preparing process of superfine WC-Co composite powder
  • Simple fast preparing process of superfine WC-Co composite powder
  • Simple fast preparing process of superfine WC-Co composite powder

Examples

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Effect test

example 1

[0019] Example 1, the WO 2.9 、Co 3 o 4 Mixed with carbon black powder for ball milling, the ball-to-material ratio is 3:1, the ball milling medium is absolute ethanol, the ball mill speed is 400r / min, and the ball milling time is 30 hours. The mixed powder after ball milling was dried in a vacuum oven at a set temperature of 100°C for 20 hours to obtain the starting powder for reduction and carbonization (as shown in Figure 1(a)), in which the average of tungsten oxide and cobalt oxide powder The particle size is about 40 nm, and the average particle size of carbon black is 200 nm. Put the mixed powder into a mold for cold pressing, and then send it into a vacuum reduction furnace, whose vacuum gas pressure is less than 0.0004Pa. The reduction and carbonization process is as follows: the heating rate is 15°C / min, the holding temperature is 1080°C, and the holding time is 4 hours. The composition identification of the ultrafine WC-Co composite powder prepared by the above p...

example 2

[0020] Example 2, first WO 2.9 、Co 3 o 4 Mixed with carbon black powder for ball milling, the ball-to-material ratio is 3:1, the ball milling medium is absolute ethanol, the ball mill speed is 450r / min, and the ball milling time is 40 hours. The mixed powder after ball milling was dried in a vacuum oven at a set temperature of 80°C for 22 hours to obtain the starting powder for reduction and carbonization (as shown in Figure 1(b)), in which the average of tungsten oxide and cobalt oxide powder The particle diameter is 30 nanometers, and the average particle diameter of carbon black is 150 nanometers. Put the mixed powder into a mold for cold pressing, and then send it into a vacuum reduction furnace, whose vacuum gas pressure is less than 0.004Pa. The reduction and carbonization process is as follows: the heating rate is 20°C / min, the holding temperature is 1050°C, and the holding time is 4 hours. The composition identification of the ultrafine WC-Co composite powder prepa...

example 3

[0021] Example 3, first WO 2.9 、Co 3 o 4 Mixed with carbon black powder for ball milling, the ball-to-material ratio is 3:1, the ball milling medium is absolute ethanol, the ball mill speed is 500r / min, and the ball milling time is 40 hours. The mixed powder after ball milling was dried in a vacuum oven at a set temperature of 100°C for 25 hours to obtain a starting powder for reduction and carbonization (as shown in Figure 1(c)), in which the average of tungsten oxide and cobalt oxide powder The particle diameter is 30 nanometers, and the average particle diameter of carbon black is 150 nanometers. Put the mixed powder into a mold for cold pressing, and then send it into a vacuum reduction furnace, whose vacuum gas pressure is less than 0.0004Pa. The reduction and carbonization process is as follows: the heating rate is 30°C / min, the holding temperature is 1150°C, and the holding time is 3 hours. The composition identification of the ultrafine WC-Co composite powder prepa...

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Abstract

The simple fast preparation process of superfine WC-Co composite powder belongs to the field of nanometer powder preparing technology. The preparation process includes the following steps: mixing WO2.9, Co3O4 and carbon black material in the required Co content; ball milling the mixture in a ball milling into superfine powder and cold pressing; heating in a vacuum furnace at vacuum condition to produce redox and carbonizing reaction at heating rate of 15-30 deg.c / min, reaction temperature 1050-1150 deg.c for 3-4 hr. The present invention has simple preparation path and short technological process, and obtains WC-Co composite powder of average particle size smaller than 400 nm.

Description

technical field [0001] The invention belongs to the technical field of ultrafine or nanoscale powder preparation. Background technique [0002] Due to its unique properties such as high hardness and wear resistance, high bending strength and good fracture toughness, WC-Co cemented carbide is widely used in the fields of cutting tools, molds, mining tools and wear-resistant parts. However, for traditional coarse-grained cemented carbide materials, their hardness and toughness have always been a pair of contradictions that restrict each other. In recent years, studies have found that when the grain size is reduced to below 0.5 μm, the hardness, flexural strength and toughness of cemented carbide materials can maintain high values, that is, ultrafine cemented carbide materials have excellent comprehensive properties. [0003] It is generally believed that the key link in the preparation of ultrafine cemented carbide lies in the preparation of ultrafine raw material powder. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20
Inventor 张久兴宋晓艳刘文彬
Owner BEIJING UNIV OF TECH
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