32results about How to "Low and stable contact resistance" patented technology

A connector and coaxial cable interconnectable via axial compression upon a cylindrical section of a solid outer conductor of the cable. The cylindrical section may be formed in the cable by drawing a cable end into an interference fit between a sleeve and an outer conductor seat formed in the connector body. Alternatively, the cylindrical section may be formed in the outer conductor during cable manufacture and the cylindrical section retained between the outer conductor seat and a crimp ring radially deformed by an angled die face during axial compression. To increase flexibility of a straight walled cable, annular corrugations may be formed in the solid outer conductor with the cylindrical sections at each corrugation peak. The cylindrical section having a length of at least 3 millimeters or 4 times the corrugation depth.

A connector and coaxial cable interconnectable via axial compression upon a cylindrical section of a solid outer conductor of the cable. The cylindrical section may be formed in the cable by drawing a cable end into an interference fit between a sleeve and an outer conductor seat formed in the connector body. Alternatively, the cylindrical section may be formed in the outer conductor during cable manufacture and the cylindrical section retained between the outer conductor seat and a crimp ring radially deformed by an angled die face during axial compression. To increase flexibility of a straight walled cable, annular corrugations may be formed in the solid outer conductor with the cylindrical sections at each corrugation peak. The cylindrical section having a length of at least 3 millimeters or 4 times the corrugation depth.

The invention relates to an AgWC (wolfram carbide) electrical contact material and a manufacturing method thereof, in particular to a silver-based electric contact material and a manufacturing method thereof, belonging to the technical field of electrical contact materials. A substrate of the AgWC electrical contact material is infiltrated with silver from upper surface to lower surface. The manufacturing method comprises the following steps of: obtaining Ag and WC mixed powder by applying a powder mixing process; pressing the mixed powder into a powder billet by applying a powder pressing process; then putting a prepared thin silver sheet on the powder billet by applying an infiltration sintering process, conveying into a heating furnace and heating, melting the silver sheet and infiltrating into the powder billet to further obtain an AgWC electric contact; and beautifying the surface of the AgWC electric contact by applying a polishing process. The AgWC electric contact manufactured by adopting the manufacturing process has favorable electric conduction performance and heat conduction performance, high corrosion resistance, strong fusion welding resistance, and the like.

The invention relates to the technical field of electrical contact materials, in particular to a tungsten-base electrical contact material and a method for making the same. The high-voltage tungsten-base composite contact material comprises a tungsten substrate, wherein the tungsten substrate comprises nickel, copper and a caking agent, and the copper is infiltrated into the tungsten substrate. The method for making the high-pressure tungsten-base contact material comprises the following the steps of: 1, mixing, namely ball-milling and refining tungsten powder and activated nickel to obtain alloy powder, doping copper powder into the alloy powder and mixing, and adding the caking agent to obtain mixed powder; 2, pressing, namely placing the mixed powder in a mould, and pressing to obtain a press blank; and 3, infiltrating and sintering, namely placing the press blank in a sintering furnace for pre-sintering to form a skeleton, forming pores under the conditions of high temperature and protective atmosphere, melting the copper and casting on the skeleton, and infiltrating into the skeleton. The high-pressure tungsten-base composite contact material produced by the method has the advantages of high electric conduction performance, good heat conduction performance, high corrosion resistance, strong fusion welding resistance and the like.

The invention relates to the technical field of electrical contact materials, in particular to a copper copying silver material and a method for making the alloy-copper embedded copying silver material. The alloy-copper embedded copying silver material of an automobile electric appliance comprises a brass plate substrate; a positioning groove is arranged on the brass plate substrate; and a silver bar is arranged on the positioning groove and is fixedly melted with the brass plate substrate into a whole. The method for making the alloy-copper embedded copying silver material of the automobile electric appliance comprises the following steps of: 1, digging the positioning groove; 2, welding; 3, sintering; 4, pre-cold rolling; 5, annealing; 6, finely cold rolling; 7, rolling and shearing; and 8, performing surface treatment. The alloy-copper embedded copying silver material, which is produced by the method of the automobile electric appliance has the advantages of high electric conduction performance, good heat conduction performance, high corrosion resistance, strong fusion welding resistance and the like; a contact bridge and a contact are connected into a whole, so the material can be used in frequently-acted automobile appliances, particularly frequency-acted electric appliances such as automobile brake lamp switches and automobile window switches.

The invention relates to a preparation method for a silver-based alloy contact material. Silver powder, tungsten powder, nickel powder, copper powder, aluminum powder and titanium carbide are mixed proportionally and them smelted in vacuum, and melted liquid is atomized into powder; the obtained powder is put into an oxidation furnace for internal oxidation treatment, and internally oxidized alloypowder is obtained; and the procedures of cold pressing, high temperature sintering, re-pressing, extruding and drawing of the internally oxidized alloy powder are conducted, and the silver-based alloy contact material is obtained. Through the method, the heating time of materials at a high temperature is greatly shortened, losses of silver materials are reduced, through internal oxidation, oxidephases are diffused and evenly distributed in matrix phases, the alloy reinforcement effect is achieved, meanwhile, through raw material optimization and matching, the oxide phases of the adopted rawmaterials can remarkably improve the electric resistance, fusion welding resistance and abrasion resistance of the alloy material, and the alloy material can be better applied to the field of electronic devices.

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 provides a copper-coated-with-silver graphene composite rivet contact and a preparation method therefor. The contact comprises a main body, and the head part and/or tail part of the main body are/is provided with a silver graphene composite layer. Silver graphene is used for a covering material of the head part or tail part of a rivet, and the prepared contact is good in conductivity, is high in hardness, and is long in service life. Meanwhile, the method is simple, is good in technological controllability, is easy to achieve scale production, is uniform in material organization, and is stable in performance.

The invention discloses a platinum alloy containing Sc and used as a high-conductivity and high-heat-conduction electrical contact material. In terms of weight percentage, the chemical composition of the alloy is: Sc:1.5‑2.0wt.%, Y:1.5‑2.0wt.%, Mo:0.8‑1.2wt.%, Sn:0.2‑0.6wt.%, Si:1.2‑ 2.6wt.%, Pd: 0.5‑1.0wt.%, Ho: 0.2‑0.6wt.%, Pr: 0.2‑0.5wt.%, B: 0.2‑0.5wt.%, and the balance is platinum. Compared with traditional electrical contact platinum alloys, this material has excellent mechanical properties, thermal conductivity and electrical conductivity.

The invention relates to the technical field of metal powder processing, and discloses a surface post-treatment method for a 3D printing copper alloy contact material. The surface post-treatment method comprises the following steps that S1, sand blasting grinding materials are sprayed out by sand blasting equipment to conduct sand blasting grinding on the surface of a copper alloy contact; S2, the copper alloy contact obtained after sand blasting and a cleaning tool are put into a PP liquid storage tank to be cleaned; S3, the surface is neutralized by using a degradable environment-friendly solvent; S4, rough polishing is conducted for 20-30 min at first, and then fine polishing is conducted three times through an Al2O3 and SiO2 ceramic abrasive material; S5, magnetic precision grinding is carried out, the frequency ranges from 20 Hz to 60 Hz, the time ranges from 60 min to 180 min, and the magnetic field exchange time ranges from 1 min to 3 min; and S6, vacuum cleaning and drying are conducted. The surface post-treatment method for the copper alloy contact can meet the requirements of the market on the appearance quality of the copper alloy contact, and has the advantages of low cost and high efficiency.

The invention discloses a method for preparing a rare-earth contact material. The method comprises the following steps: (1) smelting, namely smelting silver, cadmium, and rare earth materials at 1200-1250 DEG C; (2) casting an ingot, namely a casting molten liquid into the ingot in the presence of an inert gas; (3) machining; (4) carrying out hot extrusion at a hot extrusion temperature of 780-820 DEG C; (5) carrying out pre-oxidation treatment at 680-750 DEG C for 24-48 hours, wherein the oxygen pressure is 0.4-0.6MPa; (6) crushing and molding; (7) carrying out secondary hot extrusion at 860-890 DEG C, wherein the retention time is greater than or equal to 3 hours, and the extrusion ratio is greater than 240 to 1; and (8) processing a wire rod, namely carrying out annealing treatment on the wire rod at no less than 650 DEG C for more than an hour, and carrying out homogenization treatment on the wire rod at 250-380 DEG C for more than an hour. The AgCdO contact material prepared by the method is relatively excellent in melting-welding resistance, relatively low and stable in contact resistance, relatively low in temperature rise, and relatively excellent in melting-welding resistance.

The invention discloses a platinum alloy containing Ru and used as a highly conductive and corrosion-resistant electrical contact material. In terms of weight percentage, the chemical composition of the alloy is: Ru:2.5‑4.0wt.%, Ti:1.0‑3.0wt.%, Ge:0.4‑0.8wt.%, Mn:0.2‑0.5wt.%, Al:0.5‑ 0.8wt.%, Pd: 0.5‑1.0wt.%, W: 0.2‑0.5wt.%, Pr: 0.4‑0.8wt.%, B: 0.2‑0.5wt.%, and the balance is platinum. Compared with traditional electrical contact platinum alloys, this material has excellent corrosion resistance and electrical conductivity.

The silver-conductive ceramics composite contact material belongs to the field of new material technology, and its main composition contains 60%-90% of silver and 40%-10% of conductive ceramics. Said invention possesses good arc-suppressing property, fusion welding resistance, loss resistance, antisticking property and silver mobility resistance, also has the low and stable contact resistance and small temp. rise.

The invention discloses an alloy material. The alloy material is characterized by comprising, by weight, 15-20 parts of epoxy resin, 20-30 parts of silver, 5-8 parts of stannum, 15-20 parts of tungsten, 10-30 parts of nickel, 5-30 parts of copper, 5-30 parts of aluminum, 3-5 parts of molybdenum, 2-4 parts of phosphorus and 10-20 parts of titanium carbide. The alloy material provided by the invention has excellent electrical conductivity and heat conducting property, is low and stable in contact resistance and high in electrical loss resistance, improves the fusion welding resistance of electrical contact materials and can be applied to high-capacity electrical contact materials.