Core-shell structure type tungsten carbide-cobalt hard alloy raw material powder and preparation method thereof

A technology of core-shell structure and tungsten carbide, which is applied in the field of preparation of cemented carbide raw material powder, can solve the problem of affecting the density and uniformity of the alloy particle size alloy structure, uneven mixing of the metal binder phase and the hard phase, and affecting the hardness of the hard alloy. The strength and toughness of high-quality alloys and other issues can be achieved to achieve the effect of rapid response, complete core-shell structure and easy alloying

Inactive Publication Date: 2009-10-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of the physical mixing method of ball milling, the distribution of hard phase (WC) and binder phase (Co) is uneven, and phenomena such as "cobalt pool" and abnormal grain growth are prone to occur during sintering, which deteriorates the sintered alloy. The strength and toughness of the alloy; and through sintering, the properties of the alloy structure are inherited from the properties of the raw material powder, and the quality of the raw material powder will greatly affect the particle size of the alloy particles, the compactness and uniformity of the alloy structure, thereby affecting the cemented carbide. toughness
[0003] The preparation method of a core-shell structure type tungsten carbide-cobalt cemented carbide composite powder provided by the present invention can effectively overcome the problem of uneven mixing between the metal binder phase and the hard phase in the ball mill mixing method, and is Access to high-performance cemented carbide provides assurance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 10g ultrafine WC was ultrasonically suspended in 50ml water for 2 hours, after adjusting the pH of the WC suspension to 13 with NaOH solution, the suspension was placed in a water bath at 80°C, and then added with 4g CoCl 2 ·6H 2 O, 2gNaOH and 30ml of water prepared cobalt source solution, after the temperature is constant, add 15ml of hydrazine solution (80%) dropwise within half an hour under stirring conditions, keep warm for 1h after the dropwise addition, filter and wash, and vacuum dry at 55°C for 2h , to obtain core-shell structure type WC-Co composite powder.

Embodiment 2

[0018] 10g ultrafine WC was ultrasonically suspended in 50ml water for 2 hours. After adjusting the pH of the WC suspension to 12 with NaOH solution, the suspension was placed in a water bath at 85°C, and then added with 4g CoCl 2 ·6H 2 O, 2gNaOH and 30ml of water prepared cobalt source solution, after the temperature is constant, add 15ml of hydrazine solution (80%) dropwise within half an hour under stirring conditions, keep warm for 1h after the dropwise addition, filter and wash, and vacuum dry at 55°C for 4h , to obtain core-shell structure type WC-Co composite powder.

Embodiment 3

[0020] 10g ultrafine WC was ultrasonically suspended in 50ml water for 5 hours, after adjusting the pH of the WC suspension to 11 with NaOH solution, the suspension was placed in a water bath at 85°C, and then added with 6g CoCl 2 ·6H 2 0, 3g NaOH and 45ml water to prepare the cobalt source solution, after the temperature is constant, add 25ml hydrazine solution (80%) dropwise within half an hour under stirring conditions, keep warm for 1h after the dropwise addition, filter and wash, and vacuum dry at 60°C 4h, the core-shell structure type WC-Co composite powder was obtained.

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Abstract

The invention provides a method for preparing core-shell structure type tungsten carbide-cobalt composite powder. Hard phase tungsten carbide in the composition powder is completely and evenly coated by binding phase metal cobalt to form a core-shell structure. The method comprises the steps of: performing ultrasonic dispersion on tungsten carbide powder; then adding the tungsten carbide powder into a cobalt-containing reducing solution; adjusting the pH value of the solution, and controlling the temperature; then adding a reducer solution in a dripping mode; reducing an even cobalt coating layer on the surface of hard phase tungsten carbide powder; and forming the core-shell structure type tungsten carbide-cobalt composite powder. Hard alloy raw material powder obtained by adopting the method has high dispersivity; a hard phase and a binding phase have even distribution so as to ensure that the powder is easy for alloying; and obtained hard alloy has high obdurability.

Description

technical field [0001] The invention belongs to the field of preparation of cemented carbide raw material powder, and relates to a method for preparing cemented carbide raw material powder by a liquid phase reduction method, in particular to a preparation method of core-shell structure type tungsten carbide-cobalt composite powder. Background technique [0002] The traditional preparation method of tungsten carbide cemented carbide is to mix tungsten carbide (WC) powder and metal cobalt (Co) powder for ball milling, cold press forming, and finally densification by liquid phase sintering at a temperature of 1400 °C. Due to the limitation of the physical mixing method of ball milling, the distribution of hard phase (WC) and binder phase (Co) is uneven, and phenomena such as "cobalt pool" and abnormal grain growth are prone to occur during sintering, which deteriorates the sintered alloy. The strength and toughness of the alloy; and through sintering, the properties of the allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 廖立谢克难叶金文汪玉洁龙沁赖雪飞
Owner SICHUAN UNIV
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