Method and system for preparing silver copper oxide composite powder

Abstract

The invention discloses a method and system for preparing silver copper oxide composite powder. The preparation method comprises the following steps that 1, silver raw material and copper raw materialare weighed according to the proportion, the sliver raw material and the copper raw material are dissolved to prepare a precursor solution containing silver nitrate and copper nitrate; and 2, an atomization treatment is carried out on the precursor solution to obtain precursor fog drops with the particle size being 0.01-100 [mu]m, and thermal decomposition is carried out on the precursor fog drops at the temperature of 400-1000 DEG C to obtain the silver copper oxide composite powder. The preparation system comprises an atomizing device, a heat treatment device and a cyclone collecting device. The preparation method is characterized in that a proper amount of C1-C4 alcohol is added when the precursor solution is prepared, and therefore the degree of sphericity of the silver copper oxide composite powder can be effectively controlled; a proper amount of ammonia water is added, and therefore the silver copper oxide composite powder with the hollow structure can be prepared; the cyclonecollecting device can be used for effectively grading powder bodies with different particle sizes; and the process design is scientific, the process is continuous, the equipment structure is reasonable, the raw materials are easy to get and low in price, the phase of the reaction product is controllable, the purity is high, the particle size is controllable, large-scale production can be realized,and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of preparation of functional powder materials, in particular to a method and system for preparing silver-copper oxide composite powder. Background technique [0002] Silver copper oxide composite powder is a widely used composite material, and its application fields are different with different CuO content. When the copper oxide content is 8-12wt%, it is mainly used as an electrical contact material; the silver copper oxide content is 20wt%. The composite powder can effectively improve the sintering characteristics of the silver powder in the conductive paste; in addition, the silver-copper oxide composite powder can also be used as a catalyst material. At present, silver copper oxide composite powder has attracted much attention due to its relatively stable performance in low-voltage switches, relays and controllers. [0003] In the prior art, the main methods for preparing silver oxide copper electrical c...

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Problems solved by technology

[0003] In the prior art, the main methods for preparing silver oxide copper electrical contact materials include alloy internal oxidation method and powder metallurgy method, among which, alloy internal oxidation method is a relatively advanced process for preparing electrical contact materials. Simple, low cost, and excellent contact performance, it is widely used at home and abroad, but the surface and internal structure of the finished material prepared by this method are not uniform, and there is a poor oxide layer in the middle, which leads to inaccurate contact dimensions; powder metallurgy method It is one of the main preparation methods of silver metal oxide composite materials. The powder metallurgy method can obtain electrical contact materials with relatively uniform structure and stable performance, but the prepared finished materials have low density, poor processability, high resistivity, Disadvantages such as poor interfacial wettability between oxide particles and the substrate, weak interfacial bonding strength, etc.

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