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
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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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