A method for coating aluminum oxide on the surface of metal particles
A technology of coating alumina and metal particles, which is applied in the field of radio component manufacturing, can solve the problems of complicated preparation steps and unsimplified process
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Embodiment 1
[0044] Vacuum resistance heating evaporation aluminum plating adopts vacuum resistance heating evaporation device to heat to 1200°C at a vacuum degree of 0.1Pa to obtain aluminum vapor. The temperature of 200-mesh pure iron particles is much lower than that of aluminum vapor, and the aluminum vapor atoms will be attached to the 200-mesh On the surface of the pure iron powder particles, the metal particles are continuously falling, and the aluminum atoms are deposited to obtain the metal particles coated with aluminum. Put the metal particles coated with aluminum in a container, pass through ozone, and oxidize at room temperature for 0.5h, so that The aluminum is oxidized to alumina, and the aluminum oxide is coated on the surface of the metal particles.
Embodiment 2
[0046] Vacuum high-frequency induction heating evaporation aluminum plating uses a vacuum high-frequency induction heating evaporation device to heat to 1100°C at a vacuum degree of 0.01Pa to obtain aluminum vapor. The temperature of 100-mesh iron-silicon aluminum alloy particles is much lower than that of aluminum vapor, and the atoms of aluminum vapor It will be attached to the surface of sendust aluminum particles, the sendust aluminum particles will continue to fall, and the aluminum atoms will be deposited to obtain aluminum-coated sendust aluminum particles. Put 100g of aluminum-coated metal particles into 2000mL of hydrogen peroxide (concentration: 30%), the hydrogen peroxide is controlled at 20°C to chemically react with the aluminum to oxidize the aluminum into alumina, and complete the coating of the aluminum oxide on the surface of the metal particles.
Embodiment 3
[0048] Vacuum laser heating evaporation aluminum plating uses vacuum laser heating evaporation device to heat to 1300°C at a vacuum degree of 0.1Pa to obtain aluminum vapor. The temperature of 300-mesh iron-silicon alloy particles is much lower than that of aluminum vapor, and the aluminum vapor atoms will be attached to the iron. On the surface of the silicon alloy particles, the iron-silicon alloy particles continue to fall, and the aluminum atoms are deposited to obtain metal particles coated with aluminum. Put the metal particles coated with aluminum into the discharge solution. The discharge solution configuration method is sodium hydroxide 2.5g / L, Sodium silicate 7~11g / L, sodium aluminate 3g / L, sodium hexametaphosphate 3g / L, trisodium phosphate 25g / L, boric acid 7g / L, just mix well. Keep the temperature of the solution not exceeding 40°C, turn on the high voltage, initially start from 600V, at this time, see a small spark in the solution, that is, micro-arc discharge, con...
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