7results about How to "Lower volume resistivity" patented technology

The invention relates to a wear-resistant antistatic metal coating and a preparation method thereof, and belongs to the technical field of organic coatings. The metal coating prepared by the invention is mainly prepared from a modified carbon nanotube, an ammonium bromide grafted quaternary phosphonium salt dihydric alcohol compound and polyurethane, wherein after the carbon nano tube is modified by an ammonium bromide grafted quaternary phosphonium salt dihydric alcohol compound, quaternary phosphonium salt and quaternary ammonium salt which are subjected to surface grafting modification can play a role of a dispersing agent, so that the dispersion uniformity of the carbon nano tube in the coating is improved; the uniformly dispersed carbon nanotubes can contact with the ammonium bromide grafted quaternary phosphonium salt dihydric alcohol compound uniformly distributed in the coating through quaternary ammonium salt and quaternary phosphonium salt groups modified on the surfaces of the carbon nanotubes to form a more compact conductive path network with better contact, and the volume resistivity is reduced. And the uniformly dispersed carbon nanotubes and the formed compact conductive path network with good contact are more beneficial to improving the wear resistance and corrosion resistance of the coating.

The invention discloses a medium-low temperature aluminum nitride ceramic heater and a preparation method thereof. The medium-low temperature aluminum nitride ceramic heater comprises an aluminum nitride ceramic substrate and a metal water-cooling base or a ceramic connecting support body which are sequentially arranged from top to bottom, wherein the metal water-cooling base or the ceramic connecting support body is used for supporting the aluminum nitride ceramic substrate; the aluminum nitride ceramic matrix is prepared from the following raw materials in percentage by mass: 85-95% of aluminum nitride, 3-5% of yttrium oxide, 0-10% of titanium nitride, 0-10% of titanium diboride, 0-5% of silicon carbide, 0-5% of tungsten carbide and 0-5% of titanium dioxide. According to the aluminum nitride ceramic heater, the formula of the aluminum nitride ceramic matrix of the aluminum nitride ceramic heater is optimized, other materials such as yttrium oxide, titanium nitride, titanium diboride, silicon carbide, tungsten carbide and titanium dioxide are introduced, and the content of each component is changed through formula blending, so that the purpose of performance optimization is achieved; the volume resistivity of the aluminum nitride ceramic heater in the medium and low temperature environment is effectively reduced, the adsorption force in the machining process is guaranteed to meet the requirement, the preparation technology is simple, operation is easy to control, and industrial production is facilitated.

The invention relates to the technical field of electrical contact materials, in particular to a SnO2 electrical contact material for a new energy electrical appliance and a preparation method of the SnO2 electrical contact material. The SnO2 electrical contact material comprises 8-15% of tin oxide, 0.5-3% of a composite additive, 0.1-2% of an accelerant and the balance of silver. According to the invention, yttrium ions and chromium ions can be partially dissolved in tin oxide crystal lattices, so that the thermal decomposition reaction of tin oxide at extremely high arc temperature is effectively inhibited, the material loss caused by tin element volatilization is reduced, the second additive generates a high-melting-point composite oxide phase after high-temperature calcination, and the high-melting-point composite oxide phase is uniformly distributed in a silver matrix; as a physical skeleton for resisting arc erosion, the accelerant mainly plays a role in dispersing and interface optimizing, and an interface compound containing zinc, lanthanum, boron and oxygen is formed after the accelerant is calcined, so that the wettability and binding force between tin oxide particles and a silver matrix are improved, uniform distribution of the tin oxide particles is ensured, local overheating and concentrated erosion are avoided, and the service life of the tin oxide particles is prolonged. Therefore, the mass loss of arc ablation is obviously reduced.

The invention relates to the field of functional ceramics, and provides a low-volume-resistivity silicon carbide ceramic material and a preparation method thereof in order to reduce the volume resistivity of silicon carbide ceramics and enable the silicon carbide ceramics to meet the use requirements of semiconductor etching equipment. The preparation method comprises the following steps: in a CVD (Chemical Vapor Deposition) furnace, firstly placing a graphite base material, then vacuumizing the CVD furnace, and then re-pressing to atmospheric pressure; introducing process gas, preserving heat for 50-60 hours to obtain a CVD-SiC ceramic material, cooling to room temperature, and discharging from the furnace; carrying out annealing treatment on the prepared silicon carbide ring; then processing the inner wall and the outer wall of the obtained silicon carbide annular material; finally, the silicon carbide ring with the graphite exposed on the inner surface and the outer surface is placed in a graphite oxidation furnace, the low-volume-resistivity silicon carbide ceramic material is obtained after treatment, the overall compactness, heat conductivity and bending strength of the material are guaranteed, the volume resistivity of the silicon carbide ceramic is reduced, and the silicon carbide ceramic can be conveniently applied to etching equipment.

This invention relates to the field of tire technology and discloses a tire with low rolling resistance, high handling, and low electrical resistance, comprising a first crown, a second crown fixedly connected to the bottom of the first crown, and a third crown fixedly connected to the bottom of the second crown. This invention, by setting up a first crown, a second crown, a third crown, and vertical grooves, utilizes the vertical grooves on the first crown to pierce the water film during wet driving, thereby improving drainage efficiency and grip. On dry surfaces, the groove edges increase ground contact, enhancing handling response. Simultaneously, the groove distribution disrupts rolling noise frequencies to reduce noise, increases surface area to aid heat dissipation, buffers peak pressure to improve wear uniformity, and works synergistically with the low rolling resistance of the second crown and the electrical conductivity of the third crown. Testing has verified that this structure allows the tire to maintain a higher level of grip performance and achieve a rolling resistance coefficient reaching EU Class A.

A method for producing an electrode includes: forming a mixture including an electrode active material and a carbon additive; wherein the electrode active material is in a powder form; forming a mixture including electrode active material particles and a carbon additive; dry coating the active material with a carbon additive to produce a circumferential uniform or surrounding conductive layer on the surface of the particles of the active material; adding 10 a binder to the coated active material particles to bind the coated active material particles and produce a separate film of the mixture or applying the film on a substrate to form an electrode; wherein the mixture is formed using a dry mixing process comprising suspending the active material particles by mechanical agitation and / or flowing of air through the mixture such that they are in direct contact with the active material particles via shear forces, compression forces 15 and impact forces induced by the mixing; wherein the dry coating comprises a carbon additive surrounding particles of the active material to create an electrically conductive layer on the surfaces of the particles of the active material.

The application provides an anti-static knitted fabric based on charge accumulation and directional guidance, a preparation method thereof and a knitted fabric, and belongs to the technical field of knitted clothes. The first spinning component and the second spinning component are co-extruded through melt spinning to prepare a composite fiber with a parallel composite structure, and a composite yarn is obtained through thermal mechanical treatment; the composite yarn is introduced into a specific area of the fabric in a tuck-welt organization through an inlaying process, and latent crimping is activated through after-finishing. The application utilizes the hygroexpansion of the second spinning component to drive macroscopic self-crimping of the composite yarn, and constructs an efficient conductive framework by physical extrusion of the internal conductive filler, so that humidity response adjustment of the anti-static performance and directional dissipation of the charge are realized, the problems of fixed conductive state, local static accumulation and poor comfort of the existing fabric are effectively solved, and the safety and wearing experience of the clothes are improved.