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Ultrafine copper powders with mean diameters of about 0.05 and 1 μm were prepared by the chemical reduction method. The powders were treated with phosphating solution to improve their oxidation resistance. Nanometer-sized copper powders are unstable in air at room temperature and the treated nanometer-sized powders have an oxidation temperature of about 220°C, which is very stable in air. The treated...
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