35results about How to "Reduce surface contact resistance" patented technology

A stainless steel having a low surface contact resistance for fuel cell separators is provided. The stainless steel has a Cr content of 16 to 40 mass % or more. The stainless steel includes a region having a fine textured structure on its surface, and the area percentage of the region is 50% or more, preferably 80% or more. The region having a fine textured structure is a region which has a structure having depressed portions and raised portions at an average interval between depressed portions or raised portions of 20 nm or more and 150 nm or less when observed with a scanning electron microscope.

The invention discloses a manufacturing process for a silver cadmium oxide zirconium oxide electrical contact and an electrical contact product. In the manufacturing process, the electrical contact product is manufactured through smelting, ingot casting, hot extrusion, drawing into ally wires, forming of required specification of sheet through cold heading, then diffusion annealing and oxidation treatment. The electrical contact product produced by adopting the preparation method is characterized in that the electrical contact product is low in surface contact resistance, good in electrical property and arc extinguishing performance, high in welding resistance and good in combination property. The processing method is simple, the material utilization rate is high, the detrimental impurity is few, the production cost is low, and the production cycle is low. The economic benefit and social benefit are particularly obvious.

The invention relates to a solid Ta electrolytic capacitor and a preparation method thereof, comprising a flat cuboid capacitor body which consists of a Ta core, an insulator and a metal shell, and a flat cathode dual-head leading wire and a flat anode dual-head leading wire which are arranged in a C-shape and respectively led out of the anode and cathode of the two ends of the body; in order to prepare the capacitor, firstly, the Ta core in flat cuboid shape is prepared; the C-shaped flat cathode dual-head leading wire and the anode dual-head leading wire are assembled with the Ta core; subsequently, resin is poured so as to form the capacitor by natural solidification. The electrolytic capacitor adopting the structure reduces the surface contact resistance of the product and has obviouseffect on reducing the high frequency ESR value of the product and improving the high frequency characteristic of the product as the capacitor body structure is changed into flat cuboid and the surface area of a Ta block is increased; after two ends of the leading wire are bent to parallel flat dual-head leading wire, most of the generated inductance can be counteracted, and the frequency range of the inductance appearing in the electronic circuit is delayed.

The invention belongs to the technical field of electrode paste of solar cells, and particularly relates to alloy powder for silicon solar cell aluminum paste. The alloy powder comprises at least one type of first silicon aluminum alloy and at least one type of second silicon aluminum alloy. The mass content of silicon in the first silicon aluminum alloy is smaller than 12.73%, the mass content of the silicon in the second silicon aluminum alloy is larger than or equal to 12.73%, and both the melting point of the first silicon aluminum alloy and the melting point of the second silicon aluminum alloy are lower than 660 DEG C. Compared with the prior art, the alloy powder is added to the aluminum paste, so that conductive particles are firmly sintered together, surface contact resistance among aluminum particles is reduced, and the conductive performance of a thick film is excellent; formation of a deep doped p+ zone on a silicon wafer is facilitated and the conversion efficiency of a solar cell is improved; a sintering temperature window section is expanded, the manufacturability of a product is good, the technology sensibility of the defects such as aluminum beads, aluminum bubbles and dust generation in the sintering process of the aluminum paste is reduced, and the performance stability is improved.

The invention provides a conductive anti-corrosion coating of an electric power grounding grid and a preparation method thereof. The raw materials in the preparation method comprise the following components: room temperature vulcanization silicone rubber, at least one of dimethylbenzene or petroleum ether used as a thinner, nanometer conductive carbon black, a carbon black dispersant, silver-coated glass spheres, a titanate-based chelate used as a catalyst and methyl trialkoxysilane used as a cross-linking agent. The preparation method comprises the following steps of dispersedly mixing the room temperature vulcanization silicone rubber, the thinner and the carbon black dispersant by metering; adding the nanometer conductive carbon black until homogeneous dispersion is achieved; adding the silver-coated glass microspheres until homogeneous dispersion is achieved; and conveying the mixture into a reactor for reaction and naturally cooling in a vacuum state to obtain the conductive anti-corrosion coating. The comprehensive technical performance indexes of the technical scheme are superior to those of the prior art, and the invention has the advantages of short tack-free time, favorable anti-corrosion performance, high thermal stability and low surface contact resistance.

The present invention disclosed a manufacturing process and its products for silver oxide calcium oxide. The manufacturing process is: melting, ingots, thermal squeezing, pulling into alloy silk materials, and the specifications required for the formation of cold 镦 镦 required.The sheets and discharge of electrical contact products are obtained by oxidation treatment.The electrical contact products produced by the preparation method of the present invention are characterized by low surface contact resistance, good electrical properties, arc extinguishing performance, strong anti -welding performance, and excellent comprehensive performance.Simple processing methods, high material utilization, less harmful impurities, low production cost, and short production cycle.Economic benefits and social benefits are particularly significant.

The present invention provides a surface modification method of stainless steel bipolar plate of proton exchange membrane fuel cell belonged to field of energy source. Injecting nickel ion to stainless steel plate by ion injection method, forming injection layer at range of several decade nanometer on surface of stainless plate, and modified stainless steel bipolar plate is obtained. The present invention can improve corrosion resistance, reduce contact resistance of metal bipolar plate and gas diffusion layer to meet the acquirement of development of proton exchange membrane fuel cell.

The invention relates to a method for injecting compound ions of a bipolar plate of a proton exchange membrane fuel cell in the technical field of fuel cells. The bipolar plate is composed of a surface modification layer and substrate stainless steel. By adopting the method of the ion injection, the ions in arbitrary combination of two elements of nickel, chromium and copper or of all three elements are injected into a stainless steel thin plate, and an injection layer is formed on the surface of the stainless steel thin plate within the range of dozens of nanometer, so as to obtain a modified stainless steel bipolar plate. The invention has the advantages that the corrosion resistance performance of a metallic bipolar plate can be further improved, the contact resistance of the metallic bipolar plate with a gas diffusion layer (carbon paper) can be reduced, a thinner bipolar plate can be produced, and the weight ratio energy and the volume ratio energy of a fuel cell can be increased, so as to satisfy the development requirement on the proton exchange membrane fuel cell.

The invention relates to a preparation method for diphasic nanometer particle dispersion strengthening copper matrix composite material and relates to the copper matrix composite material. A sol-gel process is combined with a wet powder mixing and powder metallurgic method in the preparation method, and the preparation method comprises the following steps: Ti4+ ion doped Sn(OH)4 dry powder and Al(OH)3 dry powder are prepared; SnO2-TiO2 nanometer powder and Al2O3 nanometer powder are prepared by calcination; a dispersing agent polyethylene glycol-20000 is added into the two powders to prepare turbid liquid in absolute ethyl alcohol, then electrolytic Cu powder is added and mixed in the turbid liquid to form a heavy paste mixture, and then the mixture is dried to prepare (0.3wt%-2.5wt% of Al2O3 + 0.7wt%-4.5wt% of SnO2-TiO2) / Cu composite powder; and finally the diphasic nanometer particle dispersion strengthening copper matrix composite material with high strength, high conductivity, good high temperature softening resisting performance and electric arc burning loss resisting performance and low surface contact resistance is obtained through pressing and sintering.