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

The invention discloses a copper-based electric contact composite material and a preparing method thereof, and belongs to the technical field of metal composite material preparing. The copper-based electric contact composite material comprises, by mass percentage, 10%-30% of chromium, 1%-5% of tungsten carbide and the balance copper. The copper-based electric contact composite material is high in compactness and even in structure and has high specific conductance and good anti-arc erosion performance. According to the preparing method, after chromium powder, tungsten carbide powder and copper powder are mixed, the spark plasma sintering technology is utilized for preparing a copper-chromium-tungsten carbide composite material. The obtained composite material has the high strength and high smelting point of chromium, good electrical conductivity and abrasion resistance of tungsten carbide and high electric conductivity and thermal conductivity of copper. The preparing method is controllable and environment-friendly, the technology is simple, cost is low, and the production period is short. The preparing of the electric contact composite material which has high anti-arc erosion performance, anti-welding capability, strength and electric conductivity performance is achieved, and the copper-based electric contact composite material is suitable for application and popularization.

The invention provides a method of producing high performance Argentine/ graphite electronic contactor material, it includes following steps: 1) expanded graphite and Argentine are combined to produce raw material powder, the weight ratio of expanded graphite is 3-10%, the weight ratio of Argentine is 90%-97%; 2) Argentine/ graphite raw material powder obtained in step 1) is sintered, and pressed to molding. The craftwork of the invention is easy, it convenient to operate, requirement of equipment is low, cost of production is low; the performance of product produced is well, nanophase graphite piece is even in material, resistivity is low, density is high, it possesses perfect performance of anti-arc corrosion.

The invention relates to a technology for preparing a silver rare earth oxide electric contact material for a low voltage electric apparatus with a liquid phase method. According to the method, a chemical reduction method is combined with a homogeneous precipitation method to prepare nano-silver and rare earth oxide powder, and the silver rare earth oxide electric contact material is prepared by adopting a powder metallurgy technology, so that the contact material has high hardness, density and electric conductivity. The material used in the technology is easily available and little, and the cost is low; the chemical reduction method is combined with homogeneous precipitation method to prepare nano-silver and rare earth oxide powder, so that the technology is simple, the nano-silver and rare earth oxide powder are easy for industrial production, and the technology is environment-friendly and meets the currently recommended requirement of low-carbon production; and the contact material has good electrical property, 10%-30% of silver can be saved, and the contact material is a novel silver-saving electrical contact material.

The invention discloses a shell-core-structure MXene@MAX composite contact reinforcing phase material and a preparation method thereof. The MXene@MAX composite contact reinforcing phase material is ofa multi-dimensional core-shell structure, an inner core is a MAX-phase material, and the shell is a MXene material corresponding to the MAX-phase material of the inner core. An Ag/ MXene@MAX composite contact reinforcing phase material using the MXene@MAX and a preparation method thereof are disclosed. According to the MXene@MAX composite contact reinforcing phase material, after compounding withthe Ag matrix, the three-dimensional MAX plays a role of a supporting structure, the two-dimensional MXene plays the role of conducting electricity and heat and enhancing bonding with an Ag-based interface, the density, the conductivity, the heat conduction and the anti-arc erosion performance of an Ag-based electrical contact are improved, and the surface temperature rise, the contact resistanceand the material loss rate of the electrical contact are reduced.

The invention discloses a silver-ceramic series electric contact material and a preparation method thereof. The material consists of 1 to 15 weight percent of boron nitride (BN), 0.5 weight percent of cerium (Ce) and the balance of silver (Ag). The silver-boron nitride-cerium contact material prepared by the method is second-phase boron nitride (BN) particles which are dispersed and distributed in a silver matrix to reinforce the contact material, and the addition of the cerium improves wettability of liquid-state silver on the boron nitride to prevent the second-phase particles from clustering and more compactly combine the silver with the boron nitride. Experimental results of electric life after 2 hundred thousand times of action at direct current of 12V and lamp load of 8*21W+5*5W (impact current of 33A and steady current of 16A) can show that the pitting of a contact is not serious, and the contact material is not obviously transferred and the material has the advantages of high arc erosion resistance, material transfer resistance and comprehensive performance.

The invention discloses a copper-chromium contact material for a vacuum circuit breaker and a preparation method thereof. The copper-chromium contact material comprises the following components of, byweight, 20-60% of Cr and the balance Cu, and comprises the following raw materials of, by weight, 30-350 microns of chromium powder and 350 or below microns of copper powder, wherein the chromium powder is electrolytic chromium powder or aluminothermic reduction chromium powder, the copper powder is electrolytic copper powder or atomized copper powder, the purity of the chromium powder is 99.00%-99.98%, and the purity of the copper powder is 99.00%-99.98%. Compared with an existing mold pressing and sintering process, the preparation method of the copper-chromium contact material for the vacuum circuit breaker, mass stabilization production can be achieved, and large-specification copper-chromium contacts can be produced in a batched mode. According to the preparation method, the technological process is simple, the heating process is only 30-90 minutes, and time and energy are greatly saved compared with a mold pressing sintering process which is as long as 15-30 hours. The producedcontacts are compact in structure, free of air holes and other defects and good in electric arc erosion resistance.

The invention relates to an electrical contact material and a preparation method thereof, and a graphene modified carbon/carbon electrical contact and a preparation method thereof. According to the invention, by utilization of the characteristics of high strength, high electrical conductivity and high thermal conductivity of graphene, the graphene is adopted for functional modification of a carbon/carbon composite material; the graphene and resin are mixed and diluted through an organic solvent, and pressurized to be immersed into a porous chemical-vapor-deposition treated carbon/carbon composite green body; and the processes of curing, carbonization and graphitization are adopted to prepare a graphene-modified carbon/carbon composite electrical contact which has the advantages of excellent mechanical properties, high mechanical strength, low electrical resistivity, good wear resistance, good arc-erosion resistance, etc.

The invention discloses a multi-ingredient oxide enhanced silver-based electric contact material and a preparation method thereof. The material is prepared from the following chemical ingredients in percentage by mass: 6 to 10 percent of Sn, 2 to 6 percent of In,0 to 5 percent of La, 0 to 5 percent of Bi, 0 to 3 percent of Zn, 0 to 3 percent of Sm, 0 to 3 percent of Hf and the balance of Ag. The method comprises the following process steps of proportionally weighing metal with the ingredient proportion; putting the metal into a zirconium oxide crucible; performing vacuum sensing melting and casting to obtain an alloy ingot blank; performing turning processing on the alloy ingot blank to obtain a rod blank; putting the rod blank into a special inner oxidization furnace for pressurization inner oxidization to obtain the multi-ingredient oxide enhanced silver-based electric contact material; performing heat extrusion, room temperature pulling processing to obtain the multi-ingredient oxide enhanced silver-based electric contact material. The multi-ingredient oxide enhanced silver-based electric contact material prepared by using the method has the advantages that the pulling resistantintensity reaches 280 to 340 MPa; the electric life reaches 150 thousand times under the test conditions of AC/220V/15A.

The invention discloses an intermediate-voltage AC-DC high-power isolating switch with a grounding function. The isolating switch comprises a base, transmission components, conductive components, insulating components, driving and control components and a grounding switch component. The grounding switch components comprises the components of a static contact which is arranged on an output terminal, a moving contact which can move relative to the static contact, and a static driving mechanism for driving the moving contact to move. The moving contact can realize on-and-off with the static contact in a motion process. The transmission components drive a contact driving mechanism to act in an action process. Furthermore when a moving knife switch is on with a wire inlet terminal, the moving contact is separated from the static contact. When the moving knife switch assembly is separated from the wire inlet terminal, the moving contact is on with the static contact. The insulating switch performs on-off controlling on the moving knife switch assembly and furthermore can realize on-off operation on the grounding switch component, thereby realizing switching-on of the grounding switch when the moving knife switch of the isolating switch is switched off, realizing a grounding function, and ensuring life safety of maintenance personnel in a locomotive.

The invention discloses a preparation method of a composite nanoparticle-reinforced silver-based electrical contact material. The method comprises the following steps: firstly, plating tungsten on a surface of spherical nano-SnO2; then putting the obtained tungsten-coated SnO2 composite nanoparticles into a silver melt; and preparing the material by stirring, pouring, extruding, drawing or rollingprocess. The invention has the advantages that density of the material is greatly increased and the composite nanoparticles can be uniformly distributed on a silver base; compared with a traditionalsilver metal oxide electrical contact material, the composite nanoparticle-reinforced silver-based electrical contact material prepared in the invention has low resistivity, high viscosity of a moltenpool during electrical contact, and good arc erosion resistance.

The invention discloses a conductive structure of an isolation switch of a direct-current cabinet of a tracked (trackless) street car carriage. The conductive structure comprises a conductive and insulating part, a machine base and transmission part and a driving and control part. The conductive structure is a conductive part on insulators arranged at two ends of the base, the conductive part is composed of a bipolar double-phase incoming line, an output terminal and two groups of movable knife switches of eight copper bars connected with the output terminal, an alloy copper contact is arranged at the copper bar end, and the hardness of the contact is HRC 43-46 after the contact is subjected to heat treatment by a special process. And the movable knife switch and a copper terminal are pressed by a belleville spring. A nylon insulating cap is creatively mounted on a large-head screw outside the disc spring of the movable knife switch, so that 6000 A current can be insulated to the maximum extent. The switch with the conductive structure is stable in performance, safe and durable, can be used for a direct current cabinet of a tracked (trackless) street car, and can also meet the widerequirements of three-phase four-wire system alternating current power grids of traction power supply systems of subways, light rails, intercity and the like in urban rail transit.