108results about How to "Improved arc erosion resistance" patented technology

The invention discloses a submicron particle reinforced Ag-based electrical contact material and a preparation method thereof. The method comprises the following steps: adopting chemical plating method to coat silver on the surface of submicron W particles or WC particles, and then adopting pressing infiltration method to prepare dense micron particle reinforced Ag-based composite material. The material comprises the following components by weight percent: 0.1%<=Ni<=2%, 0.1%<=Cu<=2%, 30%<=W(or WC)<=80% and the balance Ag, wherein the grain size of W or WC powder is 0.01-1mu m. The material ofthe invention has good mechanical and physical properties and the reinforced phase particles are dispersed evenly. Compared with the traditional Ag-W material or Ag-WC material, the material has better fusion welding resistance, lower electric arc burning loss resistance and longer electrical life as the tiny high melting point reinforced phase is distributed evenly in the material substrate in dispersion manner.

The invention discloses a preparation method of fine-particle stannic oxide reinforced Ag-based electrical contact material, which adopts AgSn alloy powder to be mixed and collide mutually in the ball milling process, and keeps high-pressure oxidative atmosphere in the ball milling process simultaneously to lead the pre-oxidation of the AgSn alloy powder and the ball milling dispersing process to be conducted synchronously, thus greatly shortening the pre-oxidation time of the AgSn alloy, avoiding high-temperature oxidation and improving SnO2 distribution condition. The method has the characteristic of simple and flexible operation, and the silver tin oxide prepared by the method has the ideal structure of submicron or nanometer SnO2 particle reinforced phase dispersed distribution, thus leading the material to have high strength, high electrical conductivity and excellent electrical properties.

The invention provides a preparing method of a carbon nanometer tube reinforced tungsten copper composite material. The preparing method comprises the specific steps that at first, tungsten powder, copper powder and carbon nanometer tubes are added into a high-energy ball mill according to the proportion to be subjected to ball milling and mixed uniformly, and WCu mixed powder with the CNTs dispersed and distributed is obtained; then the mixed powder is pressed to obtain a composite material green body; and finally, the composite material green body is subjected to liquid phase sintering and infiltration in a high-temperature hydrogen atmosphere sintering furnace, and then the carbon nanometer tubes and the in-situ synthesis tungsten carbide mingled reinforced tungsten copper composite material are obtained. According to the preparing method, by means of the high-energy ball milling technology, the CNTs are dispersed and distributed on the surfaces of tungsten particles and copper particles, by means of high-temperature sintering, carbon sources of the surfaces of the tungsten particles and tungsten are subjected to an in-situ reaction to generate WC phases or W2C phases, the carbon sources of the surfaces of the copper particles will be dispersed and distributed in the copper phases, and then electric arc ablation resistant performance, wear resistance, high-temperature strength and the like of the WCu composite material are improved.

The invention relates to a silver-graphite electrical contact material and a preparation method thereof. The electrical contact material contains the main components of 1-8 wt% of graphite, 0.5-2 wt % of ternary layered metal ceramic, 0.1-1 wt% of lanthanum and/or cerium, not greater than 0.1 wt% of impurities and the balance of silver. The preparation method comprises the following steps of: A, atomizing a mixture of the molten silver and the molten lanthanum and/or the molten cerium into silver alloy powder; B, mixing and activating graphite powder and ceramic powder; C, preparing graphite-ceramic composite powder, a reducing agent and deionized water into a granular concentration reducing suspension; D, dropwise adding ammonia water in a silver-ammonia solution prepared in a silver nitrate solution, slowly adding the reducing suspension during severely stirring and then reducing and plating the silver on the surface of the composite powder so that composite powder of silver-plated graphite powder and metal ceramic powder is obtained through precipitation and drying; and E, mixing and sintering the equivalent silver-rare earth alloy powder and silver-plated graphite and metal ceramic powder so that the silver-graphite electrical contact material is obtained. The electrical contact material has the advantages of favorable compactness, high electrical conductivity, high hardness and high electrical wear resistance and arc erosion resistance.

A method for CuW alloy contact material is disclosed in the invention, wherein tungsten powder and TiC powder are respectively weighted based on a mass ratio of 1:0.5%-1.5%, inducing copper powder are weighted based on 5%-8% of the total mass of the tungsten powder and the TiC powder, the tungsten powder, the copper powder and the TiC powder are put into a mixing tank into which industrial alcohol is added, then a non-equi-diameter grinding ball is added into the tank for batch mixing; the well-mixed mixture is poured into an axially-pressing steel mould to be mould-pressed to a tungsten green compact, an infiltrated metal copper block, together with the tungsten green compact, are placed in a graphite crucible, after being disposed within a sintering furnace having an atmosphere of high-temperature H2, the skeleton of the tungsten green compact is sintered at first and is then infiltrated. For the Tic-phase-added CuW material prepared by the inventive method, as electric arcs are efficiently dispersed, the electric arc ablation resistance of the CuW contact material is enhanced; the invention is simple in technique and easy to control.

The invention discloses a method for preparing a silver-based electrical contact material with a fibrous structure, which comprises the following steps: 1, uniformly mixing reinforcing-phase material powder with substrate silver powder uniformly, and ball milling; 2, feeding the obtained mixed powder and substrate silver powder into a powder mixer for mixing powder; 3, performing isostatic cool pressing; 4, sintering; 5, performing hot pressing; and 6, performing hot extrusion and obtaining the silver-based electrical contact material. The method of the invention can prepare the sliver-based electrical contact material with an obvious fibrous structure regardless the processing deformation amount and the levels of the plasticity and ductility of a reinforcing phase; and in the method, theprocess is simple, it is convenient to operate, the cost is low, and special requirements on equipment are avoided. The fusion welding resistance, arc erosion resistance and conductivity of the material prepared by the method are all improved greatly, and the processing performance of the material is high.

The invention discloses a preparation method of a CuW70 contact material, comprising the steps of: adding inducing copper powder into tungsten powder in certain proportion and mixing them well, putting the mixed powder into a rubber sheath which is then placed in the high pressure cylinder of a cold isostatic pressing machine so as to be pressed into a skeleton green body, and then preparing the CuW70 contact material through copper infiltration of the sintered skeleton. Due to disappeared copper-rich area and uniform two-phase distribution of the prepared CuW70 contact material by the methodof the invention, the material has rapidly moving cathode spot on the surface, effectively dispersed electric arc, less copper phase splashing, and improved ablation resistance.

The invention discloses a method for synergistically improving the arc ablation performance of a CuW contact material. The method comprises the steps that firstly, spherical electrolytic copper powderis rolled into a sheet, then reduced tungsten powder is added for ball milling, even mixing is conducted, and tungsten-copper modified mixed powder is obtained; secondly, expanded graphite is sequentially subjected to low temperature intercalation oxidation, medium temperature intercalation oxidation and high temperature intercalation oxidation, and graphene oxide is obtained; thirdly, the tungsten-copper mixed powder and the graphene oxide are added into an ethanol-water mixed solution to be mixed evenly, drying is conducted, graphene oxide/tungsten-copper composite powder is obtained and then subjected to low-temperature thermal reduction, and reduced graphene oxide/tungsten-copper composite powder is obtained; and fourthly, the reduced graphene oxide/tungsten-copper composite powder issubjected to discharge plasma liquid phase sintering, and the CuW contact material is obtained. The graphene oxide is added into the tungsten-copper modified mixed powder, thermal reduction is conducted at first, the reduced graphene oxide is obtained, then discharge plasma liquid phase sintering is conducted, tungsten carbide nanoparticles are generated, and the arc ablation performance and mechanical performance of the CuW contact material are synergistically strengthened through the reduced graphene oxide and the tungsten carbide nanoparticles.

The invention relates to a graphene enhanced copper-based composite electrocontact material and a preparation method thereof, in particular to a transition metal oxide carried graphene enhanced copper-based composite electrocontact material and a preparation method thereof. The transition metal oxide carried graphene enhanced copper-based composite electrocontact material is composed of transition metal oxide carried graphene and copper, and the transition metal oxide refers to a mixture or one of SnO2, ZnO, Fe3O4, CuO, NiO, MnO and Co3O4. The preparation method includes: well mixing transition metal oxide/graphene powder and copper powder, and performing dispersive mixing to obtain mixed powder; putting the mixed powder into a grinding tool, pressing to obtain billets, and subjecting the billets to vacuum sintering to obtain the transition metal oxide carried graphene enhanced copper-based composite electrocontact material which can be used for manufacturing of electrical contact elements. The problems of poor abrasion resistance and poor arc ablation resistance of existing graphene enhanced copper-based composite materials are solved.

A durable wear-resistant and arc erosion-resistant silver based electric contact material consists of carbon material 0.5-20wt% and balanced of silver. One dimension nano carbon material replaces, partially or completely, graphite to be added into the silver based material to form one dimension nano carbon/silver composite material as electric contact material. It has higher electric and heat conductivities, higher strength and better self-lubrication, reduces losses by wear or arc erosion, and can replace graphite silver contact material completely.

The invention discloses a method for preparing an Ag-ZnO-doped electrical contact material, comprising the following steps: obtaining modified ZnO particles by adopting a sol-gel method, improving the electrical conductivity of the ZnO particles and then preparing a dispersed composite material with compact distribution from modified ZnO used as raw material and Ag powder by the process flow of ball milling, pressing, sintering, hot extrusion and the like. Since the electrical conductivity of the ZnO particles is improved, the problems of contact resistance and overhigh temperature rise of the material in the use process are solved, thereby widening the use range of the Ag-ZnO material and improving the electrical contact performance of the material.

The invention discloses a method for manufacturing a nozzle for a circuit breaker. Inorganic materials such as boron nitride and the like are added based on a pure polytetrafluoroethylene (PTFE) material of the nozzle in the prior art, so the light reflectivity of the nozzle is greatly improved, the ablation caused by electric arc radiation to the nozzle is reduced, serious decomposition and internal explosion due to that the nozzle is subjected to optothermal and electric arc radiation are avoided, and electric arc ablation resistance of the nozzle is greatly improved.

The invention discloses a plated switch contact and a preparing method thereof. The switch contact is a combined body with a three-layer structure, the first layer is a hydrophobic rubber layer, the second layer is a sheet metal layer, the third layer is a plated layer, and a combination body of the first layer and the second layer is soaked in a chemical plating solution with a soluble gold compound and gold or gold alloy is selectively deposited on the surface of sheet metal in the combination body by a chemical deposit method to form the plated layer. According to the plated switch contact and the preparing method thereof, the prepared switch contact is suitable for heat vulcanization bonding and forming with rubber, and thereby, a rubber press key with the switch contact can be produced. The switch contact has the advantages that the resistance to atmospheric corrosion, contact chatter and arc erosion is good, the surface contact resistance is low, the service life is long, and the like.

The invention provides a Cu-Cr-Zr-Ni-Al copper alloy. The Cu-Cr-Zr-Ni-Al copper alloy comprises, by mass, 0.10%-0.70% of Cr, 0,05%-0.50% of Zr, 0.50%-2.00% of Ni, 0.10%-0.50% of A1, the balance Cu andinevitable impurities. The invention further discloses a Cu-Cr-Zr-Ni-Al copper alloy wire rod. The invention further discloses a preparation method of the Cr-Zr-Ni-A1 copper alloy wire rod. The tensile strength of the copper alloy wire rod can reach 800MPa-950MPa, the elongation rate is larger than 5%, the electrical conductivity is 34%-48% IACS, the softening temperature is 550 DEG C-600 DEG C,and the electric arc erosion loss is within 50 mg.

Disclosed is a manufacture method for electric contact material of submicron silver-stannic oxide material which belongs to electric material technical field. Its characteristics is that the following steps are included silver of 12~94.9%, stannic oxide of 5~20% and cerium oxide or lanthanum oxide powder of 1.0-8% are added according to weight ratio into stainless steel high speed ball grinder, and dispersion agent of triethanolamine and protective agent of acetone solution are added to form mixed powder of 350-400nm which then will be changed into rivet-typed electric contact material of submicron silver-stannic oxide material through pressing, sinter, hot extrusion and cold-finish drawing. It has the advantage of simple manufacture technique, low cost and suitable for production of larger scale, the contact material has high electric conductivity ,symmetric tissue, excellent tensile strength, resistance to fusion welding and electric arc burnt.

The invention provides a copper-based contact material applied to a lower-voltage apparatus and a preparation method of the copper-based contact material. The copper-based contact material comprises, by weight, 1%-40% of titanium carbide and the balance copper; or 1%-40% of titanium carbide, 0.01%-5% of carbon and the balance copper; or 1%-40% of titanium carbide, 0.01%-8% of rare earth oxide and the balance copper; or 1%-40% of titanium carbide, 0.01%-8% of rare earth oxide, 0.01%-5% of carbon and the balance copper. The preparation method of the copper-based contact material includes the following steps that copper powder and titanium carbide powder are mixed in proportion; cold isostatic pressing is conducted on the evenly mixed powder to obtain a cylindrical pressure ingot; the pressure ingot is sintered in vacuum or under atmosphere protection; hot extrusion is conducted on the sintered pressure ingot to obtain a plate; finally, the plate is rolled to the specified thickness in a cold mode; the plate is cut into the specified dimension. According to the copper-based contact material, under the condition of long-term use, contact resistance between contacts is low, and temperature rising is low and stable.

The invention relates to the technical field of metal matrix composite materials, in particular to a Cu-Ti3AlC2 composite material and a preparation method thereof. Metal copper powder is used as a matrix phase, ceramic phase Ti3AlC2 is used as a reinforcing phase, and the volume percentage of the metal copper powder in the composite material is 60%; and the Cu-Ti3AlC2 composite material is prepared from the metal copper powder and Ti3AlC2 powder through the initial pressure, sintering and re-pressing processes. By means of the Cu-Ti3AlC2 composite material, the electric conduction and thermalconduction performance of the material can be maintained as high as possible while the hardness and strength of metal Cu are improved, and application of modern industrial electrical contact elementsis achieved.

The invention discloses an arc extinction nozzle for a high-voltage breaker and a preparation method thereof. The arc extinction nozzle comprises the following components in percentage by weight: 5%-10% of aluminum nitride, 1%-15% of boron nitride and the balance of polytetrafluoroethylene resin. According to the arc extinction nozzle disclosed by the invention, inorganic fillers of the aluminum nitride and the boron nitride are compounded and stuffed in composite polytetrafluoroethylene materials, and the stuffing proportion is reasonably allocated, so that the heat conductivity of nozzle materials is obviously improved, the electric arc erosion resistance of the materials is improved, and moreover, the arc extinction nozzle has an excellent mechanical property and a high temperature resistant property. The arc extinction nozzle is used for arc extinguish chambers of an open type breaker, a pot type breaker and a breaker of an all-metal closed type combined electric appliance, and the breaking-closing property of the breaker is improved, so that the operating stability of high-voltage switch equipment is improved.

The invention relates to a preparation method of a fibriform metal copper oxide enhanced silver-based electric contact material, which is used for preparing the silver copper oxide electric contact material (wires) by taking silver powder and silver and copper alloy powder as raw materials, adding a small number of tungsten and molybdenum elements as performance adjusting elements, taking the silver oxides as a reactant and adopting the steps of mixing, press forming, solid phase in-situ sintering, extruding and drawing. The invention is characterized in that: (1) the formation of the copper oxide and the fibrosis of the copper oxide are finished at a time in the preparation and machining processes; (2) the fibriform distribution of the copper oxide forms a microstructural characteristic with a certain orientation relation to make the metal oxide rooted in a silver matrix, thereby solving the problem of the metal oxide loss of the traditional particle metal oxide in electrical arc corrosion, improving the electrical arc corrosion resistance of the metal oxide and also broadening the application range of the silver metal oxide electric contact material; and (3) the preparation method has the advantages of short flow, low production cost and easy industrialization.

The invention relates to a nitride enhanced copper-based electrical contact composite material, which comprises the following components in percentage by weight: 0.5 to 4 percent by nitride, 0.5 to 4 percent of bismuth, 0.1 to 0.6 percent of rare earth yttrium, 0.5 to 2.5 percent of yttrium oxide, and the rest is copper and other unavoidable impurities, wherein the nitride is titanium nitride or aluminum nitride. The material provided by the invention is made by a preparation method comprising the steps of preparing powder by atomization, proportioning, mixing and vacuum hot pressed sintering. The composite material takes copper as a base body, the main raw materials are rich in resources, the nitride is distributed in the copper base material uniformly and dispersedly in an enhanced phase mode, and the fineness degree of an internal organizational structure of the material is improved. The composite material not only has good electrical conductivity, thermal conductivity, welding resistance and arc ablation resistance, but also is excellent in mechanical property and abrasion resistance, can meet basic requirements of workpieces such as an electrical contact and the like for materials, and can be applied to low-voltage electrical apparatuses such as medium and low electrical-load power switches, relays, DC contactors, air switches and the like. Compared with a silver-based electrical contact material, the nitride enhanced copper-based electrical contact composite material is more advantageous in price-to-performance ratio.

The invention discloses a complex conductive oxide-modified copper-based electric contact material and a preparation method thereof, and relates to a copper-based electric contact material and a preparation method thereof. The invention aims at solving the problem of short life of a break contact of a low-voltage electrical appliance switch. The complex conductive oxide-modified copper-based electric contact material is composed of complex conductive oxide, lanthanum, zirconium and the balance copper in percentage by mass; and the molecular formula of the complex conductive oxide is ZnxCd(2-x)SnO4, and x in the molecular formula is 0-2. The preparation method comprises the following steps: weighing cadmium acetate dihydrate, dihydrate dihydrate, tin chloride pentahydrate and copper alloy powder, and dissolving the raw materials into distilled water separately and stirring to obtain a suspension, adjusting the pH value to obtain precipitates, washing, carrying out vacuum drying, calcining, sieving, carrying out cold-pressing molding, sintering, and extruding or rolling. The contact part prepared from the material disclosed by the invention is high in contact conducting capacity, self-arc-extinguishing capacity, matrix wettability and arc erosion resistance. The preparation method disclosed by the invention is applicable to preparation for the copper-based electric contact material.

The invention relates to a copper-based electrical contact composite material for middle and low voltage appliance switches, in particular to a method for preparing the copper-based electrical contact composite material through a discharge plasma sintering process. The copper-based composite material is composed of, by weight, 0.5%-4% of bismuth, 0.05%-0.4% of lanthanum, 0.05%-0.3% of a carbon nano tube (nickelized), and the balance copper and unavoidable impurities. The copper-based composite material is prepared through the preparation method of alloy powder preparation, burdening, ball milling and discharge plasma sintering; the discharge plasma sintering process is adopted and has the characteristics of being high in heating speed, short in sintering time, high in density of an obtained material, good in property and the like, so that the discharge plasma sintering process is important to realizing material preparation with high quality, high efficiency, low consumption and low cost. The copper serves as a substrate, so that the main raw material is abundant in resource, and the electrical and thermal conductibility, electric erosive resistance, oxidation resistance and the like of the material are comparable to those of a silver-based electrical contact material, and the essential requirements of electrical contact and the like for the material by workpieces can be met.