Process for producing scaled copper-gold powder under the condition of nitrogen protective atmosphere

Abstract

A method for manufacturing flaky copper-gold powder under a nitrogen protective atmosphere, adding stearic acid as the main additive to the copper-gold powder raw material, the ratio is 0.2% to 5.0% (wt) of the copper-gold powder, and feeding the ball mill with 90%- 95% pure nitrogen, and keep the temperature of the ball mill below 15°C to operate, and the powder will be the product after the discharge classification, polishing and other treatments. The invention adopts nitrogen gas as the protective gas, completely prevents the occurrence of oxidation reaction, enhances the metallic feeling of the copper and gold powder, and improves the quality and grade of the product.

Description

Technical field: [0001] The invention relates to a method for manufacturing copper-gold powder, in particular to a method for manufacturing flaky copper-gold powder under a nitrogen protective atmosphere, and belongs to the technical field of metal powder materials. Background technique: [0002] The traditional copper-gold powder manufacturing process is carried out in an air atmosphere. The disadvantage of this process is that when the copper-gold powder is processed into fine particles of a few microns, due to its high specific surface energy level and very strong activity, it is very easy to dissolve in the air. Oxygen reacts chemically to form oxides, which makes the powder lose its metallic luster and become dull, even brown and black. Due to the existence of the problem of oxidation and blackening, the contradiction between the fineness of the powder and the metallic feeling has not been overcome by the copper and gold powder production enterprises in my country, that...

AI Technical Summary

Problems solved by technology

[0002] The traditional copper-gold powder manufacturing process is carried out in an air atmosphere. The disadvantage of this process is that when the copper-gold powder is processed into fine particles of a few microns, due to its high specific surface energy level and very strong activity, it is very easy to dissolve in the air. Oxygen reacts chemically to form oxides, making the powder lose its metallic luster and become dull, even brown and black

Due to the existence of the problem of oxidation and blackening, the contradiction between the fineness of the powder and the metallic feeling has not been overcome by the copper and gold powder production enterprises in my country, that is, the finer the powder, the less metallic feeling; The powder is too thick to meet the requirements of users, resulting in the quality of copper and gold powder in my country has been at a low level due to the lack of metallic feeling

For example, the copper and gold powder production process introduced in the paper "Optimization and Transformation of Ultrafine Copper and Gold Powder Manufacturing Process" (Zhou Jinxin et al., "New Technology and New Process" 2000 / 3, P31-32) adopts air atmosphere production technology, and the ball milling of the whole process The grading process is carried out using air as the medium, which solves the problem of fineness and over-grinding in the processing of copper and gold powder, but this process cannot avoid the phenomenon of oxidative discoloration caused by the chemical reaction between oxygen in the air and copper and gold powder