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A kind of preparation method of tungsten carbide-nickel carbide

A cemented carbide, tungsten carbide technology, used in metal processing equipment, transportation and packaging, coating, etc., can solve the problems of non-dense products, poor performance, and many impurities, and achieve high repeatability, simple operation, and packaging. Even coverage

Active Publication Date: 2021-10-19
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical mixing process is low in cost and easy to operate, but the efficiency is low, and the mixing is uneven, and there are many impurities in the product. The sintered product is not dense and has poor performance.

Method used

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  • A kind of preparation method of tungsten carbide-nickel carbide
  • A kind of preparation method of tungsten carbide-nickel carbide
  • A kind of preparation method of tungsten carbide-nickel carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 50g of tungsten carbide powder with an average particle size of 5.0 μm and a purity of 99.9%, place it in 500ml of hydrofluoric acid-nitric acid mixed aqueous solution and carry out coarsening treatment under mechanical stirring. The concentration of hydrofluoric acid is 30ml / L, and the concentration of nitric acid is 30ml / L, the stirring time is 30min, after stirring, soak for 20min, then filter and dry the powder. Get 19.06g of solid granular medicine NiCl at the same time 2 ·6H 2 O is added to deionized water to configure a concentration of 0.4mol / LNiCl 2 Solution 200ml, take 5.68g solid granule medicine (NH 4 ) 2 C 2 o 4 ·H 2 O was added to deionized water to configure a concentration of 0.2mol / L (NH 4 ) 2 C 2 o 4 The solution was 200ml, and the two solutions were heated to 50°C in a water bath at the same time. Then take 21.2g of roughened tungsten carbide powder and pour it into the heated NiCl 2 solution, after mechanical stirring for 20min, the ...

Embodiment 2

[0037] Take 50g of tungsten carbide powder with an average particle size of 5.0 μm and a purity of 99.9%, place it in 500ml of hydrofluoric acid-nitric acid mixed aqueous solution and carry out coarsening treatment under mechanical stirring. The concentration of hydrofluoric acid is 30ml / L, and the concentration of nitric acid is 30ml / L, the stirring time is 30min, after stirring, soak for 20min, then filter and dry the powder. Get 19.06g of solid granular medicine NiCl at the same time 2 ·6H 2 O is added to deionized water to configure a concentration of 0.4mol / LNiCl 2 Solution 200ml, take 5.68g solid granule medicine (NH 4 ) 2 C 2 o 4 ·H 2 O was added to deionized water to configure a concentration of 0.2mol / L (NH 4 ) 2 C 2 o 4 The solution was 200ml, and the two solutions were heated to 65°C in a water bath at the same time. Then take 21.2g of roughened tungsten carbide powder and pour it into the heated NiCl 2 solution, after mechanical stirring for 20min, the ...

Embodiment 3

[0040] Take 50g of tungsten carbide powder with an average particle size of 5.0 μm and a purity of 99.9%, place it in 500ml of hydrofluoric acid-nitric acid mixed aqueous solution and carry out coarsening treatment under mechanical stirring. The concentration of hydrofluoric acid is 30ml / L, and the concentration of nitric acid is 30ml / L, the stirring time is 30min, after stirring, soak for 20min, then filter and dry the powder. Get 19.06g of solid granular medicine NiCl at the same time 2 ·6H 2 O is added to deionized water to configure a concentration of 0.4mol / LNiCl 2 Solution 200ml, take 5.68g solid granule medicine (NH 4 ) 2 C 2 o 4 ·H 2 O was added to deionized water to configure a concentration of 0.2mol / L (NH 4 ) 2 C 2 o 4 Solution 200ml, and the two solutions were heated to 35 ° C in a water bath at the same time. Then take 21.2g of roughened tungsten carbide powder and pour it into the heated NiCl 2 solution, after mechanical stirring for 20min, the NiCl ...

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Abstract

The invention discloses a preparation method of tungsten carbide-nickel hard alloy, comprising the following steps: (1) preparing NiCl with the same volume and different concentrations 2 solution and (NH 4 ) 2 C 2 o 4 solution, and heated in a water bath; (2) the tungsten carbide powder and NiCl 2 The solution is mixed evenly to obtain WC‑NiCl 2 mixed solution, (NH 4 ) 2 C 2 o 4 Add WC‑NiCl to the solution 2 Heating in a water bath in the mixed solution, stirring-aging-suction filtration-drying to obtain a mixture precursor powder; (3) calcining the mixture precursor powder in a protective atmosphere to obtain a tungsten carbide-nickel composite powder; (4) The tungsten carbide-nickel composite powder is mixed with rubber, granulated, pressed and calcined to obtain tungsten carbide-nickel hard alloy. The tungsten carbide-nickel hard alloy prepared by the method has high purity, less impurities, high density, uniform nickel coating, and excellent hardness, density, bending strength and impact toughness.

Description

technical field [0001] The present invention relates to a kind of preparation method of hard alloy, more specifically, relate to a kind of preparation method of tungsten carbide-nickel hard alloy. Background technique [0002] Cemented carbide is a powder metallurgy product sintered by hard phase: high hardness, refractory metal carbide powder and Co, Fe, Ni and other binder phases. The sintered cemented carbide products not only have the high hardness, high wear resistance, and excellent red hardness, thermal stability and corrosion resistance of ceramics, but also have the strength and excellent toughness of metals. At present, the mixing of the hard phase and the binder phase usually adopts a mechanical mixing method, such as a hand mixing wet grinding process. The mechanical mixing process is low in cost and easy to operate, but the efficiency is low, and the mixing is uneven, and there are many impurities in the product. The sintered product is not dense and has poor p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05B22F1/02
CPCC22C29/08C22C1/051B22F2998/10B22F1/17B22F1/10B22F3/02B22F3/1007
Inventor 闵凡路汪升张建峰朱文超杨浩
Owner HOHAI UNIV
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