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Ultra-fine hard alloy coated powder and method for preparing same

A technology of cemented carbide and coated powder, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problems of poor quality and low service life of ultra-fine cemented carbide products, and achieve low cost , improved flexural strength and fracture toughness, simple preparation process

Inactive Publication Date: 2008-05-28
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using coarser cobalt powder and ball milling process, it is obvious that the coarser cobalt powder (≥1μm) is difficult to mix evenly with ultrafine tungsten carbide powder and other carbide powders (≤1μm), which leads to ultrafine hard Cobalt pools are easily produced after sintering of cemented carbide, which increases the tendency of hard phase grains to aggregate and grow, resulting in poor quality of ultra-fine cemented carbide products and low service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] WC-6 wt% Co-0.5 wt% TaC (NbC) coated powder.

[0020] Pretreatment 94g of tungsten carbide WC and tantalum carbide TaC (niobium carbide NbC) mixed powder with an average Fischer particle size of 0.8 μm, including 93.5 g of tungsten carbide WC powder and 0.5 g of tantalum carbide TaC (niobium carbide NbC) powder. Mix the mixed powder with 25mL of alcohol evenly, and after it is activated and dispersed, it will be used as the coating matrix. The mixed powder of pretreated tungsten carbide WC and tantalum carbide TaC (niobium carbide NbC) was dispersed in 1000mL cobalt sulfate solution, the concentration of cobalt sulfate solution was: cobalt sulfate heptahydrate (CoSO 4 ·7H 2 O): 29g / L; Stir evenly and heat to 90°C, keep the temperature constant and stir continuously. After the aqueous solution forms a sol, add precipitant ammonium carbonate, ammonium carbonate (NH 4 CO 3 ·H 2 0): 16.1g / L. Adjust the pH of the solution to 7.5, heat with a water bath to control the te...

Embodiment 2

[0022] WC-5% (weight) TiC-0.5% (weight) VC (Cr 3 C 2 )-10% (weight) Co coated powder.

[0023] Pretreatment of tungsten carbide WC with a Fibonacci average particle size of 0.6 μm, titanium carbide TiC and vanadium carbide VC (chromium carbide Cr 3 C 2 ) mixed powder 90g, including tungsten carbide WC powder 84.5g, TiC powder 5g, vanadium carbide VC (chromium carbide Cr 3 C 2 ) powder 0.5g. Tungsten carbide WC and 1μm titanium carbide TiC and vanadium carbide VC (chromium carbide Cr 3 C 2 ) Mixed powder and 25mL of alcohol are evenly mixed, and after it is activated and dispersed, it is used as a coating matrix. The carbide powder after pretreatment is dispersed in 1000mL cobalt sulfate solution, and the concentration of each component in the cobalt sulfate solution is: cobalt sulfate heptahydrate (CoSO 4 ·7H 2 O): 50g / L; Stir evenly and heat to 90°C, keep the temperature constant and stir continuously. After the aqueous solution forms a sol, add precipitant ammonium ...

Embodiment 3

[0025] WC-1 wt% TaC(NbC)-8 wt% Co coated powder.

[0026] Pretreatment 92g of mixed powder of tungsten carbide WC with average particle size of 0.4μm and tantalum carbide TaC (niobium carbide NbC) of 0.6μm, including 91g of tungsten carbide WC powder and 1g of tantalum carbide TaC (niobium carbide NbC) powder. Mix tungsten carbide WC and tantalum carbide TaC (niobium carbide NbC) mixed powder with 25mL of alcohol evenly, and after it is activated and dispersed, it will be used as the coating matrix. The pretreated tungsten carbide WC and tantalum carbide TaC (niobium carbide NbC) mixed powder are dispersed in 1000mL cobalt chloride solution, the concentration of cobalt chloride solution is: cobalt chloride hexahydrate (CoCl 2 ·6H 2 O): 42g / L, stir evenly and heat to 95°C, keep constant temperature and stir continuously, after the aqueous solution forms a sol, add precipitant ammonium carbonate, ammonium carbonate (NH 4 CO 3 ·H 2 O): 27.5g / L. Adjust the pH of the solution ...

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PUM

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Abstract

The invention discloses a super-fine cemented carbide coating powder and process of preparation thereof. Super-fine hard-phase carbonization tungsten in the cemented carbide coating powder and other carbides such as titanium carbide, tantalum carbide, niobium carbide, vanadium carbide and / or chromium carbide are composed around by cobalt-phase ultra-fine powder particles. Karl Fischer's mean particle size of the super-fine cemented carbide coating powder is <=1 mu m. The super-fine tungsten carbide of the invention is put into the liquor of water-soluble metal cobalt-salt after being activated and dispersed with other hard-phase of carbide powder, the super-fine carbide powder and other hard-phase of carbide powder are taken as the core, chemical coprecipitation coating is employed in the reaction, and a uniform cobalt carbonate or cobalt hydroxide inhibitory coating is formed on the surface of the tungsten carbide powder and other hard-phase of carbide powder. The coprecipitation coating powder can be made into the super-fine cemented carbide coating powder by filtering, washing, and drying and low temperature reduction. The invention has the advantages of simple technique and low cost, which can take place the existing cemented carbide wet grinding mixture and the preparation method. High quality super-fine cemented carbide can be prepared by utilizing the powder of the invention.

Description

technical field [0001] The invention relates to a cemented carbide raw material, more specifically, the invention relates to an ultrafine cemented carbide coating powder, and the invention also relates to a manufacturing method of the ultrafine cemented carbide coating powder. Background technique [0002] my country is a big producer of cemented carbide, but not a strong producer of cemented carbide. Compared with the level of developed countries, the quality of cemented carbide products in my country is poor, and most of the products have low performance. They are still primary products with low technical content and low added value, and their service life is short. Ultrafine cemented carbide has excellent comprehensive properties, and is an important direction of research and development of cemented carbide at home and abroad. The preparation of ultra-fine cemented carbide must use high-quality ultra-fine cemented carbide coated powder, but the research and application i...

Claims

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Application Information

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IPC IPC(8): C22C29/08B22F1/02C23C18/00
Inventor 刘沙张伟
Owner CENT SOUTH UNIV
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