Method for preparing hollow or clad nickel alloy spherical powder

[0020] Example 1:

[0021] Preparation of Micron Hollow Spherical Nickel-Phosphorus Alloy Powder

[0022] Nickel sulfate, sodium hypophosphite, sodium hydroxide are mixed with deionized water respectively into nickel sulfate solution of 260g/L, sodium hypophosphite solution of 320g/L and sodium hydroxide alkali solution of 15g/L, three kinds of solutions At the same time, heat it in a constant temperature water bath at 90±1°C for 8 minutes, and add 5-10ml of 20g/L citric acid solution, 1-3ml of lactic acid, and 2-5ml of 10g/L thiourea to the nickel sulfate solution. Then pour sodium hydroxide into the nickel sulfate solution to obtain uniform nickel hydroxide colloid. Then pour the sodium hypophosphite solution into the nickel hydroxide colloid, put it back into the constant temperature water bath and heat it at the aforementioned temperature, while stirring continuously, then the reaction occurs, a large number of bubbles emerge, the reaction proceeds violently, and a large amount of black precipitate appears in the solution , the reaction is basically complete when there are no more bubbles in the solution. Filter the resulting black precipitate, wash it with ammonia water, deionized water, and acetone, and dry it in an oven at 55°C for 2 hours. The nickel phosphorus in the obtained powder is amorphous and microcrystalline, and it is completely crystalline after heat treatment at 300°C for 1.5 hours. The hollow spherical powder of the melted part. The phosphorus content in the finally obtained hollow nickel-phosphorus alloy powder is 7.88%, the particle size of the powder is 0.3-2 μm, and the thickness of the hollow spherical shell is 0.05-0.2 μm.

[0023] Example 2:

[0024] Preparation of Nanoscale Coated Spherical Nickel-Phosphorus Alloy Powder

[0025] Dissolve nickel chloride, potassium hypophosphite and potassium hydroxide in deionized water respectively, prepare 100g/L, 150g/L and 60g/L solutions, put them in a constant temperature water bath at 90±1°C and heat for 6 minutes , and add 4-8ml of lactic acid, 2-5ml of adipic acid, and 1-3ml of 12g/L propenylthiourea to the nickel chloride solution. Then pour potassium hydroxide into the solution of nickel chloride to obtain uniform nickel hydroxide colloid, then pour the potassium hypophosphite solution into the nickel hydroxide colloid, put it back into the constant temperature water bath and heat it at the aforementioned temperature, and react for a period of time. After a period of time, a large amount of black precipitate appeared in the solution. Filter the obtained black precipitate, wash it, and dry it in an oven at 60°C for 2 hours. The particle size of the finally obtained nickel-phosphorus alloy powder is 20-50nm, and the powder contains nickel hydroxide.

[0026] Example 3:

[0027] Preparation of Micron Hollow Nickel-Cobalt Spherical Powder:

[0028] Prepare 200g of nickel sulfate and 20g of cobalt sulfate into 1L of composite metal salt solution, prepare hydrazine hydrate and sodium hydroxide into solutions of 70g/L and 12g/L respectively, put them in a constant temperature water bath at 55±1°C and heat for 7 Minutes, then pour sodium hydroxide into the composite metal salt solution to obtain a uniform hydroxide colloid, then pour the hydrazine hydrate solution into the colloid solution, put it back into the constant temperature water bath and heat it at the aforementioned temperature, a large amount of brown Black precipitate, filter the resulting precipitate, wash it, and dry it in an oven at 55°C for 2 hours. The particle size of the hollow nickel metal powder obtained is 0.5-1.5 μm. The nickel in the obtained powder is in a microcrystalline state, and it is obtained after hydrogen reduction Hollow spherical nickel-cobalt powder.