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Anti-oxidation method for superfine copper powder

An ultra-fine copper powder, anti-oxidation technology, applied in the field of powder metallurgy products, can solve the problems of shape damage, easy spontaneous sintering, large surface free energy, etc., and achieve good anti-oxidation effect, simple process, and uniform particle size

Active Publication Date: 2013-06-05
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uneven dispersion of anti-oxidants, the resistivity of some copper powders increases. At the same time, due to the large specific surface area and large surface free energy of ultra-fine copper powders during the hydrogen reduction process, it is easy to spontaneously sinter, resulting in increased particle size, shape damage, and poor formability. , the resistivity further increases and other defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Wash the superfine copper powder produced by electrolysis with pure water, wash away the impurity ions in the superfine copper powder, especially sulfate radical and chloride ion, make the sulfate radical and chloride ion in the superfine copper powder after washing meet the requirements; take Benzotriazole (BTA), prepared as the first antioxidant with a concentration of 0.1g / L; take ascorbic acid, prepared as the second antioxidant with a concentration of 1.0g / L; take 0.1% of the weight of the copper powder before washing The first antioxidant, poured into the washed copper powder, stirred evenly, soaked for 60 minutes, then added the second antioxidant of 0.1% of the weight of the copper powder before washing, soaked for 30 minutes; filtered, dried at 80 ° C The copper powder after soaking is qualified to be dried and passed through a 300-mesh sieve to complete the anti-oxidation treatment of the superfine copper powder. The ultrafine copper powder after anti-oxidatio...

Embodiment 2

[0026] Wash the superfine copper powder produced by electrolysis with pure water, wash away the impurity ions in the superfine copper powder, especially sulfate radical and chloride ion, make the sulfate radical and chloride ion in the superfine copper powder after washing meet the requirements; take Tolyltriazole (TTA) was prepared as the first antioxidant with a concentration of 0.5 g / L; glucose was prepared as the second antioxidant with a concentration of 5.0 g / L; 0.15% of the weight of the copper powder before washing % Get the first anti-oxidant, pour the first anti-oxidant taken into the copper powder after washing, stir evenly, soak for 30 minutes, then add the second anti-oxidant of 0.15% of the copper powder weight before washing, soak for 10 minutes; After filtering, the soaked copper powder is dried at a temperature of 150° C., and passed through a 300-mesh sieve to complete the anti-oxidation treatment of the superfine copper powder. The copper powder after anti-o...

Embodiment 3

[0028] Wash the superfine copper powder produced by electrolysis with pure water, wash away the impurity ions in the superfine copper powder, especially sulfate radical and chloride ion, make the sulfate radical and chloride ion in the superfine copper powder after washing meet the requirements; take Citric acid is formulated into the first antioxidant with a concentration of 0.3g / L; ascorbic acid is mixed with the second antioxidant with a concentration of 3.0 g / L; the first antioxidant is taken by 0.125% of the copper powder weight before washing, and poured Put into the washed copper powder, stir evenly, soak for 45 minutes, then add the second antioxidant of 0.125% of the weight of the copper powder before washing, soak for 20 minutes; after filtering, dry the soaked copper powder at a temperature of 115°C, After passing the drying, pass through a 300-mesh sieve to complete the anti-oxidation treatment of the ultra-fine copper powder. After anti-oxidation treatment, the co...

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Abstract

The invention provides an anti-oxidation method for superfine copper powder. The superfine copper powder produced with the pure water washing electrolytic method meets requirements; one or two of benzene propane nitrile triazole, methyl benzene propane nitrile triazole and citric acid is / are utilized for preparing first antioxidant; ascorbic acid or glucose is utilized for preparing second antioxidant; the first antioxidant is poured into washed copper powder to a scale for soaking, and the second antioxidant is added for soaking; and then filtering, drying and sieving are performed to accomplish the anti-oxidation treatment on the superfine copper powder. Aiming at the superfine copper powder produced with the electrolytic method, the anti-oxidation method for superfine copper powder enables the oxidation of the copper powder in the drying process to be prevented, the excellent performance of the superfine copper powder is maintained, and under the pressure of 2MPa, the measured resistivity of the copper powder is 3.0*10<-6>-4.0*10<-6> ohmm, and the oxygen content is 0.10-0.20%. The anti-oxidation method for the superfine copper powder is suitable for the industries of electrical carbon, powder metallurgy parts, diamond tools and the like.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy products, and relates to a method for preventing oxidation of copper powder, in particular to an anti-oxidation method for ultrafine copper powder. Background technique [0002] Dendritic ultrafine copper powder with a particle size of 0.1-10??m is a brown or slightly purple fine powder at room temperature. Ultrafine copper powder has the characteristics of good electrical and thermal conductivity, small particle size, corrosion resistance, smooth surface, and strong fluidity. It has many specific properties and great potential application value in the fields of mechanics, electricity, chemistry, and electrode material manufacturing. Ultrafine copper powder is usually prepared by solid phase method, gas phase method and liquid phase method. The preparation of ultra-fine copper powder by electrolysis in the liquid phase method is a relatively mature and common method for industrial produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00
Inventor 张新涛李娟范桂芳张科翠宋谋通陈国栋
Owner JINCHUAN GROUP LIMITED
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