43results about How to "Good arc corrosion resistance" patented technology

The invention discloses a copper-based electrical contact composite material and a preparation method thereof, belonging to the technical field of metal composite material preparation. The copper-based electrical contact composite material is composed of the following components in mass percentage: 10%-30% of chromium, 1%-5% of tungsten carbide, and the balance is copper. The copper-based electrical contact composite material of the invention has high density, uniform structure, high electrical conductivity and good arc erosion resistance. In the preparation method of the present invention, after mixing chromium powder, tungsten carbide powder and copper powder, a copper-chromium-tungsten carbide composite material is prepared by using a discharge plasma sintering process; Electrical conductivity and wear resistance, as well as high electrical conductivity and thermal conductivity of copper; the preparation method is controllable and environmentally friendly, the process is simple, the cost is low and the production cycle is short, and the arc erosion resistance, welding resistance, strength and conductivity are achieved. The preparation of the electrical contact composite material with high performance is suitable for popularization and application.

The invention discloses a silver-tungsten carbide-nickel contact material and a preparation method thereof. The silver-tungsten carbide-nickel contact material is prepared from the following components in percentage by weight: 20-30% of tungsten carbide, 0.1-5% of nickel and the balance of silver. The preparation method of the material comprises the following steps: weighing tungsten carbide powder, nickel powder and silver powder, mixing evenly, putting the silver-tungsten carbide-nickel mixed powder, high-purity nickel balls and water into a ball mill for ball milling, and performing drying, annealing, forming, sintering, re-pressing and re-annealing on the ball-milled powder, thereby obtaining the silver-tungsten carbide-nickel contact material; the weight ratio of the high-purity nickel balls to the silver-tungsten carbide-nickel mixed powder is (4-10): 1; the dosage of the water is calculated according to that 130-220ml of water is added to the silver-tungsten carbide-nickel mixed powder per 1kg; the time of the ball milling is 12-48 hours; and as the nickel lost in ball milling is mixed with the powder, the weight of the weighed nickel powder is 0-92% of that of the nickel in the final silver-tungsten carbide-nickel mixed powder obtained after ball milling.

The invention discloses a core-shell structure MXene@MAX composite contact reinforcement phase material and a preparation method thereof; the MXene@MAX composite contact reinforcement phase material is a multidimensional core-shell structure, the core is a MAX phase material, and the shell is the same core The MXene material corresponding to the MAX phase material; the present invention also discloses the use of the above MXene@MAX to prepare the Ag / MXene@MAX composite contact material and its preparation method, and the MXene@MAX composite contact reinforcement phase material prepared by the present invention, After compounding with the Ag matrix, the three-dimensional MAX acts as a supporting structure, and the two-dimensional MXene plays the role of electrical and thermal conduction, enhancing the interface with the Ag-based interface, improving the density, electrical conductivity, thermal conductivity and arc erosion resistance of the Ag-based electrical contacts, and The surface temperature rise, contact resistance and material loss rate of the electric contact are reduced.

The invention provides a method for preparing Ag-SnO2 electric contact alloy with well-closed formation. The method comprises: a citric acid solution is added into a mixed solution of an HNO3 solution with Sn powder dissolved and a AgNO3 solution in a dropwise manner and stirring is carried out fully; the prepared mixed solution is added into a soluble starch water solution and the solutions are mixed completely; drying, calcining and grinding are carried out successively to obtain powder; and then compacting, sintering, amid extruding are carried out to obtain Ag-SnO2 electric contact alloy. According to the preparation method, with a sol-gel process, complexing with a metal salt solution is carried out by using the citric acid as a complexing agent to form a sol-gel material; the soluble starch water solution as a template is used as an oxide dispersion supporter to control the generated gel size. The Ag-SnO2 composite powder is prepared firstly and then the Ag-SnO2 alloy is prepared. With the method, stannic oxide can be dispersed in the silver matrix uniformly, so that the compressive performance of the Ag-SnO2 electric contact alloy can be improved. Meanwhile, the production efficiency can be improved; the preparation cost can be reduced; and impurity mixing can be reduced.

The invention discloses a MAX@MO m / AO n Electrical contact reinforcement phase material, composite electrical contact material and preparation method, which are MAX@MO with core-shell structure m / AO n , the inner core is the three-dimensional material MAX phase, and the outer shell is the oxide particle MO corresponding to the inner core MAX phase material m , AO n or complex oxide layer MO m / AO n ; MAX@MO prepared by the present invention m / AO n Ag / MAX@MO prepared as reinforcement phase m / AO n The composite electrical contact material has excellent electrical conductivity, moderate hardness and good workability. It can be processed into various electrical contact shapes according to actual application requirements. It has excellent arc erosion resistance and significant silver saving effect. The reinforced phase in the Ag matrix is ​​MAX. @MO m / AO n The content accounts for up to 40wt% of the composite material; the preparation process is simple, the practicability is good, it is suitable for mass production, and is suitable for low-voltage switchgear such as contactors, circuit breakers, relays, etc., bringing social and economic value.

The present invention relates to a silver-nickel electric contact production process. It adopts: code position-ball grinding method' to prepare silver-nickel electric contact raw material powder. It is formed from powder body preparation engineering of silver-nickel material and silver-nickel powder body sintering, wire-drawing and riveting engineering. Besides, said invention also provides the concrete steps of the above-mentioned every engineering and its concrete requirements.