58results about How to "Meet the requirements of electrical conductivity" patented technology

The invention discloses an electrolytic aluminum cathode steel-aluminum melting and brazing welding method. The method aims at solving the problems that in the production process of electrolytic aluminum, steel-aluminum welding efficiency is low, and a welding joint is poor in electrical conductivity. According to the method, a layer of welding flux with the thickness ranging from 80 microns to 150 microns is uniformly applied to each welding workpiece with a surface oxidation layer removed, and the generation amount of brittle compounds at the welding joint is reduced, so that mechanical performance of the welding joint is improved. The method that melting welding is conducted on the aluminum welding workpiece, and brazing welding is conducted on the steel welding workpiece is adopted; after preheating treatment is conducted, the aluminum welding workpiece and the steel welding workpiece are welded through welding wires. The method is low in cost, great in operability and uniform in welding composition; performance test results indicate that the pressure drop, formed after welding, at the welding joint can be lowered by 25 mV or more; the tensile strength can reach 110-150 Mpa; the shearing strength can reach 100-140 Mpa; electrical conductivity and mechanical performance are obviously superior to the traditional explosion welding mode; and economical benefits are remarkable.

The invention discloses conductive polypropylene composite powder for selective laser sintering and a preparation method thereof.The conductive polypropylene composite powder is prepared from, by weight, 100 parts of polypropylene powder, 0.05-10 parts of alkyl modified carbon nano tubes, 0.05-20 parts of metal powder, 0.1-1.0 part of flow promoter, 0.1-1.0 part of antioxidant and 0.1-5 parts of powder separant.Due to addition of the alkyl modified carbon nano tubes and the metal powder, the conductive polypropylene composite powder for selective laser sintering has good conductivity.The invention further provides the preparation method of the conductive polypropylene composite powder for selective laser sintering.The process is simple, the conductive polypropylene composite powder with the powder size and distribution meeting SLS technological requirements and the alkyl modified carbon nano tubes and the metal powder scattered uniformly can be obtained, operation is easy, large-scale production and popularization can be realized, and broad market prospects and excellent market benefits are achieved.

The invention relates to a method using glass beads to treat an anti-rust paint layer of a steel aviation part, and belongs to the technical field of surface treatment of a paint layer material. The method comprises the following steps of surface preparation, protection of non-paint spraying surfaces, sand blasting, paint spraying, baking and curing, middle inspection and reworking, treatment by the glass beads, and final characteristic inspection. The method has the advantages that the surface of the paint layer material is treated by the glass beads according to proper parameters, the conductivity of the paint layer material is less than 15 ohms per 125mm, the property requirement on conductivity by the aviation middle-temperature aluminum anti-corrosive paint layer is completely met, the curing temperature is lowered from 560 DEG C to 300 DEG C, and the part deformation is controlled; the adhesion force of the paint layer treated by the glass beads is good, the excessive paint layer material with poor surface adhesion force can be removed from a part edge with easy warpage in the glass bead blasting process, and the risk of excessive matters in the working condition of an engine is avoided.

The invention relates to a bis phosphonic acid functional organosilicon high temperature proton conductor and a preparation method thereof, the preparation method of the proton conductor is as follows: (1) hydroxyethylidene bis-phosphonic acid tetrasodium salt and tetrahydrofuran are added into a four-mouth flask, completely dissolved, then heated to 45-60 DEG C, and then slowly added dropwise with isocyanate propyl trimethoxy silane, after the reaction is completed, bis phosphonic acid trimethoxy silane can be obtained; (2) the bis phosphonic acid trimethoxy silane as a main hydrolysis precursor, amino propyl trimethoxy silane and tetraethoxysilane as auxiliary hydrolysis precursors, ethanol as a solvent, and a suitable amount of hydrochloric acid as a catalyst are stirred at room temperature to obtain a sol; (3) the sol is dried, demoulded, and soaked with hydrochloric acid for post-processing to obtain the bis phosphonic acid functional organosilicon high temperature proton conductor. The bis phosphonic acid functional organosilicon high temperature proton conductor prepared by the method has high conductivity, good hydrolysis stability and thermal stability.

The invention provides an electroconductive thermoplastic elastomer composition with an excellent electroconductive performance, which is formed by the mixing of the following raw materials in parts by weight: 30-50 parts of oil charge SEBS (Styrene-Ethylene / Butylene-Styrene) elastomer, 10-20 parts of PP (propene polymer) powder, 20-45 parts of electroconductive carbon black, 3-5 parts of carbon black dispersing agent, and 3-5 parts of anti-adhesive agent, wherein the oil charge SEBS elastomer is formed by blending of an SEBS elastomer and naphthenic base charge oil according to the weight proportion of 1 to 3. The electroconductive thermoplastic elastomer composition with the excellent electroconductive performance is especially suitable for an electroconductive thermoplastic elastomer in manufacturing an anti-clamping strip in an automobile door.