35results about How to "Improved arc burn resistance" patented technology

The invention relates to a high-performance silver cadmium oxide material and a manufacturing method thereof, which are characterized in that the silver cadmium oxide material comprises the following components: 85 to 97 percent of silver, 2 to 15 percent of cadmium, 0.01 to 0.5 percent of nickel, 0.01 to 1 percent of tin and 0.01 to 0.5 percent of rear earth mixture. The manufacturing method of the high-performance silver cadmium oxide material is characterized in that: a given quantity of silver, cadmium, nickel, tin and rare earth mixture are measured to be arranged inside a middle-frequency induction furnace to be smelted and cast, the cast ingot is extruded by an extruding machine to be thick wires, the thick wires are stretched by a wire-drawing die to be thin wires, the thin wires are pre-oxidized by an internal oxidization furnace, then the thin wires are cut and preformed and finally is processed and formed. The anti-oxidization performance, electric-arc burning loss resistance and the abrasion resistance of the silver cadmium oxide material are improved, and the service life is prolonged, so the high-performance silver cadmium oxide material can be applied to different working environments, has low production cost, simple manufacturing method and low requirements on the device and the production.

The present invention relates to the preparation process of nanometer tin oxide material with surface decorating silver, and belongs to the field of electric contact material preparing technology. The preparation process includes the following steps: adding tin oxide powder of 20-30 nm size into anhydrous ethanol and adding polyglycol as dispersant; ultrasonic stirring at room temperature and stoving; adding the treated nanometer tin oxide powder into 10-30 % concentration silver nitrate solution via electromagnetic and ultrasonic stirring for homogeneous dispersion; adding reductant hydrazine hydrate to reduce silver ion and obtain silver coated nanometer tin oxide powder and stoving at 80-120 deg.c. The present invention has the advantages of simple technological process and being suitable for industrial production, and the surface decorated nanometer tin oxide may be used in producing electric contact with excellent mechanical performance and high conductivity.

The invention discloses silver tin oxide electrician contact material and its preparation method. Its chemical composition (weight ratio) is that the SnO2 is from three percent to ten percent; the mixed rare earth oxide (Sm2O3, Gd2O3, Y2O3) is from 0.1 percent to 2.0 percent; the surplus quantity is Ag. The preparation method is that the Ag, Sn, rare earth element are made up according to the alloy design proportion of ingredients, alloying in the vacuum melting furnace; then the AgSnRE is made after quickly solidification. At first the alloy is formed to thread, panel, profiled bar or rivet by extrusion, rolling, drawing, heat treatment. Then it is formed to AgSnO2 mixed rare earth oxide electrician contact material by produce internal operation. It can be used in AC and DC contactor, relay, controller, circuit breaker, switch, and so on.

The invention provides a method for producing Cu alloy electrical contact material with good antioxidant property. The alloy is composed of rare earth (at least one selected from La, Ce and Yt elements), boron, aluminum, silver, conductive ceramic (TiN2 and/or SnO2), diamond powder and copper. The alloy is processed by powdering, mechanical mixing, isostatic pressing, sintering, extrusion and shaping steps, to make various electrical contact elements. With the inventive method, the produced electrical contact element can overcome the disadvantage of poor antioxidant capability of the prior Cu alloy electrical contact elements, and can be used to replace the silver alloy electrical contact in the field of low-voltage electrical apparatuses, thereby solving the problems of the silver alloy electrical contact, such as high cost due to noble metal silver and bad influence on social sustainable development.

The invention discloses a manufacturing method of a silver tin oxide contact alloy material and a manufactured alloy thereof. The method comprises the following steps: 1.smelting: smelting the ingredients at the preset temperature and continuing to stir in the process of smelting; 2. casting the ingredients into a round spindle and lathing the surface of the round spindle; 3. carrying out hot rolling and then cold rolling on the round spindle and then rolling the round spindle into sheets; 4. carrying out oxygenation processing on the sheets in an internal oxidation furnace; 5. crushing the sheets and then carrying out high energy crushing processing on the crushed sheets; 6. carrying out hot extrusion to obtain a wire stock blank; 7. carrying out drawing processing and annealing treatment; and 8. taking the obtained material as the finished product. The alloy comprises the following components in percentage by weight: 7%-9% of Sn, 1.0%-3.0% of rare earth additive and the balance of Ag. The invention has the advantages of more simplified technique, easy implementation and excellent product performance.

The invention relates to a copper-plated graphene reinforced copper-based electrical contact material and a preparation method thereof. The electrical contact material comprises 0.1-5.0 wt% of copper-plated graphene and 95.0-99.9 wt% of copper-rare earth alloy, and the weight ratio of rare earth in the copper-rare earth alloy accounts for 0.03-2.0%. The preparation method comprises the following steps of graphene copper plating, atomization for powder making, ball milling and power mixing, cold-press forming, sintering, secondary forming and sintering. A copper-plated graphene reinforced body is added into the copper alloy and taken as a framework, so that the material has the advantages of high hardness, high wear resistance, mechanical impact resistant performance and welding resistance; and with the addition of the rare earth, the oxidation resistance and the arc burning resistant capability of the copper alloy electrical contact material are improved.

The invention provides an arc extinguishing chamber, which comprises two side plates and an arc extinguishing grid plate group fixedly arranged between the two side plates. The arc extinguishing gridplate group comprises a plurality of first arc extinguishing grid plates and a plurality of second arc extinguishing grid plates. The plurality of first arc extinguishing grid plates are arranged under the plurality of second arc extinguishing grid plates; the thickness of each first arc extinguishing grid plate is larger than that of each second arc extinguishing grid plate; and the space betweentwo adjacent first arc extinguishing grid plates is larger than the space between two adjacent second arc extinguishing grid plates. The invention also provides an arc extinguishing system, which comprises the arc extinguishing chamber and a static contact and a moving contact opposite to the arc extinguishing chamber. The moving contact can be contacted with or separated from the static contact.By carrying out differentiated setting on the thickness of each arc extinguishing grid plate of the arc extinguishing grid plate group and the space between two adjacent arc extinguishing grid plates, arc erosion resistance is improved, and electrical life is improved.

The invention discloses a composite contact with high fusion welding resistance for a residual current protective breaker. The composite contact is characterized by comprising a silver alloy contact layer and a copper alloy contact layer, wherein the silver alloy contact layer comprises the following components in proportions by weight: 1-20% of yttrium oxide, 1-10% of diamond and the rest of silver; and the copper alloy contact layer comprises the following components in proportions by weight: 1-50% of molybdenum, 1-20% of graphite and the rest of copper. The thickness of the silver alloy contact layer is 5-50% of the thickness of the whole composite contact. The composite contact has the advantages of excellent performance, low silver content and low price.

The invention discloses a laminated silver-copper-brazing-filler-metal three-composite electrical contact material prepared by a coating method. Silver alloy powder is prepared by a coating method and copper alloy powder is prepared by a mechanical method; the silver alloy power, the copper alloy power, and a brazing filler metal material are prepared into a band material; and compounding is carried out to obtain a three-composite electrical contact material. Therefore, an electrical contact material having advantages of low material costs, excellent integrated electrical performances, and environmental protection is provided to replace the traditional copper-alloy contact material, silver-alloy contact material, and silver-copper-alloy contact material.

The invention discloses a silver-iron oxide electric contact material with dispersed oxide particles and a preparation method of the silver-iron oxide electric contact material. The preparation methodcomprises the following steps: (1) smelting silver and modified additive metal, and carrying out water atomization to form alloy powder; (2) drying and sieving the alloy powder through a 200-mesh sieve to prepare -200 mesh alloy powder; (3) mixing the -200 mesh atomized alloy powder with iron powder; (4) performing powder rolling on the powder mixed in the step (3) to form a strip; (5) annealingthe strip, and then further performing cold rolling; and (6) carrying out internal oxidation on the rolled strip, then carrying out punching, ingot pressing, sintering and re-pressing on the strip subjected to internal oxidation, and further carrying out hot extrusion to form a plate or a wire. The silver-iron oxide electric contact material prepared by the method is fine in oxide particle size and uniform in structure, the material yield is remarkably improved compared with that of a conventional multi-extrusion process, and the method is suitable for mass production.

The invention relates to a copper-plated graphene/copper-based electrical contact material and a preparation method thereof. The electrical contact material comprises the following components in percentage by weight: 0.1-2.0% of copper-plated graphene, and 98.0-99.9% of copper-rare earth alloy, wherein the weight ratio of rare earth to the copper-rare earth alloy is 0.03-3.0%. The preparation method comprises the following steps: plating copper on graphene, pulverizing to produce powder, ball-mixing and mixing powder, cold pressing and forming, and performing electric arc melting in vacuum. According to the invention, a copper-plated graphene reinforcing body as a framework is added into the copper alloy; therefore, the material has high hardness, abrasive resistance, mechanical shock resistance and melting-welding resistance; and, due to addition of the rare earth, the oxidation resistance and the electric arc erosion resistance capability of the copper alloy electrical contact material are improved.