Method for preparing cobalt-coated tungsten carbide powder by freezing
A technology for wrapping tungsten carbide powder and tungsten carbide powder, which is applied in transportation and packaging, metal processing equipment, coating, etc., can solve the problems of restricting the preparation of composite powder with high cobalt content, single processing object, and easy introduction of impurities, etc., to achieve product The effect of controllable quality, simple process flow and easy controllable particle size
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Embodiment 1
[0039] This embodiment provides a method for freezing and preparing cobalt-wrapped tungsten carbide powder, using tungsten carbide powder and cobalt acetate as raw materials, the particle size of tungsten carbide powder is 0.8 μm (Fsss), and figure 1 It is a schematic diagram of the process of this embodiment, and the specific steps are:
[0040] S1. Cobalt precursor solution configuration: take cobalt acetate to prepare a precursor solution with a concentration of 30g / L, and take 1000mL of the solution;
[0041]S2. Freeze crystallization: Add 200g of tungsten carbide powder to the cobalt precursor solution in step S1, and transfer it to a cold bath, adjust the stirrer speed to 500rpm, and perform freeze crystallization, and cool to the end point temperature at a cooling rate of 0.5°C / min. °C, after aging for 2 hours, the solution and the crystals are separated, and the separated solution is returned to step S1 to prepare a cobalt precursor;
[0042] S3. Heat treatment: Dry t...
Embodiment 2
[0045] This embodiment provides a method for freezing and preparing cobalt-wrapped tungsten carbide powder, using tungsten carbide powder and cobalt acetate as raw materials, the particle size of tungsten carbide powder is 0.8 μm (Fsss), and figure 1 It is a schematic diagram of the process of this embodiment, and the specific steps are:
[0046] S1. Cobalt precursor solution configuration: take cobalt acetate to prepare a precursor solution with a concentration of 45g / L, and take 1000mL of the solution;
[0047] S2. Frozen crystallization: Add 200g of tungsten carbide powder to the cobalt precursor solution in step S1, and transfer it to a cold bath, adjust the stirrer speed to 800rpm, and carry out frozen crystallization, and cool to the terminal temperature of 0 at a cooling rate of 1.0°C / min. °C, after aging for 3 hours, separate the solution and crystals, and return the separated solution to step S1 to prepare a cobalt precursor;
[0048] S3. Heat treatment: Dry the crys...
Embodiment 3
[0051] This embodiment provides a method for freezing and preparing cobalt-wrapped tungsten carbide powder, using tungsten carbide powder and cobalt chloride as raw materials, the particle size of tungsten carbide powder is 0.6 μm (Fsss), and figure 1 It is a schematic diagram of the process of this embodiment, and the specific steps are:
[0052] S1. Cobalt precursor solution configuration: Take cobalt chloride to prepare a precursor solution with a concentration of 20g / L, and take 1000mL of the solution;
[0053] S2. Frozen crystallization: Add 200g of tungsten carbide powder to the cobalt precursor solution in step S1, and transfer it to a cold bath, adjust the stirrer speed to 300rpm, and carry out freeze crystallization, and cool to the end point temperature at a cooling rate of 0.8°C / min - After aging at 1°C for 4 hours, the solution and crystals were separated, and the separated solution was returned to step S1 to prepare a cobalt precursor;
[0054] S3. Heat treatment...
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