Silver-nickel or silver-iron electric contact material and preparation method thereof

Abstract

The invention discloses a silver-nickel or silver-iron electric contact material and a preparation method thereof. Powder preparation and powder mixing integrated equipment is adopted, an upper-layerspraying disc is in communication with a powder spraying device, a lower-layer spraying disc is in communication with high-pressure water, dispersion strengthening phase mixed powder is loaded into the powder spraying device, and in the process of preparing silver powder through high-pressure water atomization, the dispersion strengthening phase mixed powder is sprayed into a silver solution by inert gas on a carrier, the solid dispersion strengthening phase mixed powder is wrapped by high-temperature liquid silver to form stable metallurgical bonding, then is crushed and cooled by high-pressure water to form uniform mixed powder particles, and the mixed powder particles are processed into the electric contact material through the procedures of drying, ingot pressing, extruding and the like. Compared with a traditional preparation process, the preparation method has the remarkable advantages that the distribution uniformity of the dispersion strengthening phase particles in the silvermatrix is high, the bonding strength of the dispersion strengthening phase particles and the silver matrix is high, the manufacturing process is green and environmentally friendly, and the productionperiod is short.

Description

technical field [0001] The invention relates to the field of electrical contact materials, in particular to a silver-nickel or silver ferroelectric contact material and a preparation method thereof. Background technique [0002] In the field of electrical contacts, silver-nickel and silver-iron materials occupy an important position in the entire electrical contact material system due to their excellent comprehensive electrical properties, and are mainly used in the field of contactors and relays below 25A. The iron, nickel and additives in the silver matrix belong to the dispersion strengthening phase for the silver matrix, and the arc erosion resistance and welding resistance of the silver matrix are improved through dispersion strengthening. Therefore, the dispersion strengthening phase in the silver matrix The uniformity of distribution and the bonding strength between silver and the dispersion-strengthened phase have a decisive influence on the electrical properties of ...

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Problems solved by technology

[0005] Patent ZL200610049919.5 discloses a silver-nickel electrical contact material powder prepared by "ball milling-co-precipitation method" and adding a small amount of rare earth elements with the assistance of a high-speed shear emulsifier to improve the comprehensive electrical properties of the product. The contact material manufacturing process combines the advantages of the ball milling process and the chemical co-deposition process to improve the bonding strength between silver and nickel and the added elements, but the silver-nickel electrical contact material prepared by this method, the difference between silver and nickel The combination is still mainly a physical combination, and the use of chemical co-deposition to prepare powder has serious pollution to the environment, and the cost of wastewater treatment is very high

[0006] Patent ZL201210296397.4 discloses a method of preparing silver-nickel electrical contact materials by chemical coating process. The surface of nickel powder is coated with a layer of transition elements to improve the wettability between silver and nickel, and then mixed with silver powder to form a mixed powder, which is processed into silver-nickel electrical contact materials by pressing and extruding. This preparation method has a long production cycle, and the waste water generated in the chemical coating process pollutes the environment seriously, and the overall cost is higher than that of the powder metallurgy process.

[0007] Patent ZL201610515153.9 discloses a preparation method of silver-nickel electrical contact material. The traditional powder metallurgy process is used to extrude silver-nickel into a strip, which is then sheared and crushed and then extruded into a strip with an ingot, and then sheared again. After crushing, the ingot is extruded into a strip and processed into a finished product. This processing method solves the phenomenon of uneven distribution of nickel particles in the silver matrix. However, due to the three-time extrusion process, the production cycle is long, the manufacturing cost is high, and the yield Low, not suitable for mass production

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