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Method for manufacturing ultra-fine hard alloy composite powder

A technology of cemented carbide and composite powder, which is applied in the direction of metal material coating process, liquid chemical plating, 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: 2009-10-14
JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP
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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

[0018] WC-6% by weight Co-0.5% by weight TaC (NbC) composite powder.

[0019] 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 substrate for plating. The mixed powder of pretreated tungsten carbide WC and tantalum carbide TaC (niobium carbide NbC) was dispersed in 1000mL plating solution, and then cobalt coating was carried out. The concentration of each component in the plating solution is: cobalt sulfate heptahydrate (CoSO 4 ·7H 2 O): 29g / L; sodium phosphite (NaH 2 PO 2 ·H 2 O): 30g / L; Sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O): 60g / L, boric acid (H 3 BO 3 ): 25g / L. Adjust the pH of the plating solution to 9.2, heat in a water bath to control th...

Embodiment 2

[0021] WC-5% (weight) TiC-0.5% (weight) VC (Cr 3 C 2 )-10% (weight) Co composite powder.

[0022] 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 uniformly mixed, and after activation and dispersion, it is used as the substrate for plating. The pretreated carbide powder was dispersed in 1000mL plating solution, and then coated with cobalt. The concentration of each component in the plating solution is: cobalt sulfate heptahydrate (CoSO 4 ·7H 2 O): 48g / L; sodium phosphite (NaH 2 PO 2 ·H 2 O): 50g / L; Sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O): 80g / L, boric acid (H 3 BO 3 ): 45g / ...

Embodiment 3

[0024] WC-1% by weight TaC (NbC)-8% by weight Co composite powder.

[0025] 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 substrate for plating. The pretreated tungsten carbide WC and tantalum carbide TaC (niobium carbide NbC) mixed powder were dispersed in 1000mL plating solution, and then cobalt coating was carried out. The concentration of each component in the plating solution is: cobalt chloride hexahydrate (CoCl 2 ·6H 2 O): 42g / L; sodium phosphite (NaH 2 PO 2 ·H 2 O): 18g / L; Sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O): 50g / L, ammonium chloride (NH 4 Cl): 70g / L. The pH of the plating s...

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Abstract

The invention discloses a preparation method of an ultrafine cemented carbide composite powder. The ultrafine hard phase in the composite powder of the invention is completely uniformly covered by the cobalt phase ultrafine powder particles. In the present invention, after activating and dispersing the hard phase of ultrafine tungsten carbide and other carbide powders, they are put into the solution of water-soluble metal cobalt salt, and the hard phase particles of ultrafine tungsten carbide powder and other carbide powders are used as the core. The cobalt plating process forms a uniform cobalt plating layer on the surface of the hard phase of tungsten carbide powder and other carbide powders, and after filtration, washing, drying, and low-temperature crystallization reduction, it is made into ultrafine cemented carbide composite powder. The invention has simple process and low cost, can replace the existing cemented carbide wet grinding mixture and its preparation method, and can prepare high-quality superfine cemented carbide material by using the powder of the invention.

Description

technical field [0001] The invention relates to a method for manufacturing ultrafine cemented carbide composite 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 composite powder, but our country's research and application in this area are relatively backward. At present, when most domestic enterprises prepare cemented carbide mixtures, especially ultra-fine cemente...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F1/02C22C29/06C23C18/34
Inventor 刘沙张伟李克林
Owner JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP
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