| 摘要 |
PURPOSE:To produce fine metal powder having unique electrical and magnetic characteristics by adding metal colloid to a bath contg. an inorg. metal salt or a complex salt and a reducing agent for the salt with stirring and by mixing them. CONSTITUTION:Metal colloid such as Pd colloid is added to a bath contg. an inorg. metal salt such as chloride or sulfate of Ni or Co or a complexing agent forming a complex salt such as ammonia, ethylene-diamine, pyrophosphate or citric acid and further contg. a reducing agent such as sodium hypophosphite, potassium hypophosphite or form-aldehyde and they are mixed. The Pd colloid acts as the nuclei of a catalyst and reduction reaction proceeds rapidly and uniformly around the nuclei, so useful metal powder having superior electrical and magnetic characteristics can stably be produced.
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