81 results about "Bulk resistivity" patented technology

A method and apparatus for sensing different levels of liquids in their respective containers in a liquid-consuming and/or producing instrument system. According to a preferred embodiment, an elongated liquid-sensing probe having axially spaced electrodes adapted to sense liquid at multiple levels is arranged in each container of liquid. A controller, e.g. a suitably programmed microprocessor, operates to selectively poll different pairs of electrodes carried by the probe to determine whether or not the polled electrode pairs are immersed in the contained liquid. Preferably, the polling circuit comprises an electronically-controlled resistor that serves to normalize the level-sensing output signal for liquids of different bulk resistivity.

Aqueous dispersions of artificially synthesized, mussel-inspired polyopamine nanoparticles were inkjet printed on flexible polyethylene terephthalate (PET) substrates. Narrow line patterns (4 μm in width) of polydopamine resulted due to evaporatively driven transport (coffee ring effect). The printed patterns were metallized via a site-selective Cu electroless plating process at a controlled temperature (30° C.) for varied bath times. The lowest electrical resistivity value of the plated Cu lines was about 6 times greater than the bulk resistivity of Cu. This process presents an industrially viable way to fabricate Cu conductive fine patterns for flexible electronics at low temperature, and low cost.

The invention relates to the technical field of lithium battery slurry materials, in particular to a conductive carbon material dispersing agent which comprises one of modified polyvinyl alcohol, alkyl ammonium salt copolymer, olefin block maleic anhydride copolymer and pyrrolidone copolymer, or mixtures thereof, and can effectively disperse carbon nanotube, graphene and other conductive carbon materials in a solvent to obtain uniform conductive slurry; further disclosed is a high-conductivity slurry for the lithium battery, which comprises 0.5-15.0% by weight of a conductive carbon material and 0.1-3.0% by weight of a dispersing agent, and can remarkably reduce the bulk resistivity of a positive electrode system of the lithium battery and improve the conductivity of a pole piece.

The invention discloses silicon carbide ceramic with adjustable resistance and a preparation method thereof. The ceramic material mainly comprises a silicon carbide phase as a main phase, boron carbide as a sintering aid phase, and a carbon phase as a conductive phase, and the ceramic material can be prepared and has the bulk resistivity adjustable from 10<-2> to 10<8> Omega.cm. The silicon carbide ceramic has a density of 3.00 to 3.20 g/cm<3>. The core of the method is to coat the surface of silicon carbide raw material powder with a graphene-based material layer, and to adjust the content ofthe conductive phase in the silicon carbide ceramic to obtain the silicon carbide ceramic with adjustable bulk resistivity.

The invention relates to a production method of a large-size graphite electrode which comprises the components in percentage by weight: 76-79 percent of calcined petroleum coke, 21-24 percent of medium-high temperature modified asphalt and the balance of filling material with the diameter of 0.075-2 mm, wherein the calcined petroleum coke comprises the following components in percentage by weight: not more than 4 percent of granules with the diameter of more than 12 mm, 6-10 percent of granules with the diameter of 8-13 mm, 13-17 percent of granules with the diameter of 4-8 mm, 9-13 percent of granules with the diameter of 2-4 mm and 30-32 percent of powder with the diameter of not more than 0.075 mm according to the particle size distribution; and the coking value of the modified asphalt is over 55 percent and the softening point is 95-100 DEG C. After the raw materials are mixed according to the proportion, the large-size graphite electrode is produced by adopting a conventional process, wherein the mixing temperature is 160-165 DEG C and the thicker lumpiness during the die-filling is less than 40 mm. A huge-size electrode with the diameter of over 960 mm can be produced by adopting the production method of the large-size graphite electrode; meanwhile, the electrode has low resistivity and good conduction property and can bear strong current, thereby enabling the unit consumption and the electricity consumption to be greatly lowered and saving the production cost.

The invention discloses a preparation method of ITO (Indium Tin Oxide) powder, comprising the following steps of: (a) adding an aqueous alkaline solution with the concentration of 10-30 percent by weight to an indium tin solution to obtain an indium tin hydroxide precipitation solution, and controlling the temperature of an initial precipitation solution between 18 DEG C and 30 DEG C in the process of adding the aqueous alkaline solution; (b) separating precipitations and liquid contained the indium tin hydroxide precipitation solution; (c) washing the separated precipitations; and (d) calcining the precipitations to obtain the ITO powder. The invention is beneficial to enhancing the sintering property of the ITO powder by selecting proper aqueous alkaline solution concentration and precipitation temperature according to that the aqueous alkaline solution concentration and the precipitation temperature have a great impact on the sintering property of the ITO powder when the indium tin solution is added to the aqueous alkaline solution; an ITO sintering body prepared by the ITO powder has at least 7.08 g/cm<3> of density, bulk resistivity lower than 1.90*10<-4> ohm.cm and maximum crystallite dimension of the sintering body, which is smaller than 10 micrometers.

A method and apparatus for removing soluble and insoluble contaminants from highly purified and ultra-pure liquids having a bulk resistivity in excess of one megohm-centimeter by establishing laminar flow of the liquid in a cylindrical chamber through an electromagnetic field transverse to the direction of flow, to induce mobility of the constituents. The wall of the chamber forms a cathode and a central rod forms an anode in the chamber. The mobilized constituents are transported either to the anode or the cathode, where the material will adhere and agglomerate with other constituents. Systems are provided utilizing the method and apparatus for purifying and analytically evaluating highly purified and ultra-pure water.

The invention discloses a blackening method of a lithium tantalate crystal substrate. The blackening method includes that in a chemical reductive atmosphere, a metal sheet and the lithium tantalate crystal substrate are alternately stacked by means of contacting after the surfaces of the same are roughened, and put in an environment lower than Curie temperature, the lithium tantalate crystal substrate is reduced to convert the same from white or faint yellow to colored and non-transparent, and original characteristics of the lithium tantalate crystal substrate as a piezoelectric material are still maintained. Bulk resistivity of the lithium tantalate crystal substrate after being reduced can be lowered, discharging generated by pyroelectric effect due to temperature difference in the manufacturing process of a surface acoustic wave filter (SAW filter) can be improved, accuracy of photoetching process of an interdigital electrode line is improved, and increasing of yield of SAW device manufacturing and lowering of production cost are facilitated.

The invention relates to a preparation method for high-crystallinity silver powder. The preparation method is characterized by comprising the following steps of: firstly, synthesizing a silver carbonate precursor; uniformly coating the silver carbonate precursor by using a coating agent; and performing low-temperature crystal water removing, high-temperature thermal decomposition, densification sintering and washing on the coated silver carbonate precursor to obtain high-crystallinity silver powder. Due to the adoption of the method disclosed by the invention, high-crystallinity silver powder of which the particle diameter is 0.1-5 mu m and the tap density is 3.0-7.0 g/cm<3> can be finally obtained; the silver powder can be used for preparing silver slurry or silver paste for fine threads and high-accuracy printed galvanic circles; the silver powder has the advantages of high dispersity, high crystallinity, superior degree of sphericity, uniform particle size distribution, easiness for dispersing in silver slurry or silver paste and high filling characteristic, so that high-accuracy fine thread printing can be realized; and meanwhile, an obtained silver thick film has low sintering concentration rate and low bulk resistivity.

The invention discloses a preparation method of a TZO semiconductor material for high-transmittance energy-saving glass and a preparation method thereof. ZnO and SnO2 powder is used as main materials; even mixing is carried out, a biscuit is manufactured, and drying, sintering and machining are carried out to obtain a zinc/tin oxide semiconductor material with the relative density larger than 95%; volume resistivity is smaller than or equal to 6*10<-2> omega.cm, the material is used as the magnetron sputtering target material for manufacturing Low-E glass with the transmittance larger than or equal to 85% and replaces zinc-tin alloy coating materials which are greatly used at present, the process of producing a zinc/tin oxide film through magnetron sputtering is more stable, the production technology is simpler, the sputtering speed is high, the production efficiency is improved by more than 5%, the large-area coating film layer has uniform ingredients and fine structure, the requirement of manufacturing double-silver three-silver Low-E glass for sputtering equipment is lowered, and the TZO semiconductor material has the advantages for preparing large-size high-transmittance glass.

A neutron detector comprises a gas-filled dielectric shell, preferably a glass balloon, having opposite electrodes. An electric field is established whereby ionizing particles may be detected via ionization and current flow in the gas, using a pulse height analyzer or other conventional means. The dielectric shell preferably has low gas permeability and a bulk resistivity in the range of 10⁸ to 10¹⁷ Ω-m, and is preferably in the millimeter to centimeter size range. Multiple balloons may be arranged in parallel or may be individually addressable by the detector electronics.

The invention discloses a paint making method based on conductive biological char as filler, which comprises the following steps: adopting conductive char as filler and phenol resin varnish as base; calcining broad-leaved tree species timber at 800 deg. c insulated by air for 20h to form char; grinding the char in the milling machine to form char particle with even grain size at 35um; measuring conductive property of char under sufficient compaction condition; controlling the bulk resistivity at 0.1-100 omega.cm; weighing 20-50% char to blend with residual phenol resin and solvent; adopting spray technique. The invention saves cost to increase antistatic property without breaking other properties, which can adjust surface resistivity.

Provided is a sputtering target which contains Na in a high concentration and, despite this, is inhibited from discoloring, generating spots, and causing abnormal discharge and which has high strength and rarely breaks. Also provided is a process for producing the sputtering target. The sputtering target has a composition which contains 10-40 at% Ga and 1.0-15 at% Na as metallic components other than F, S, and Se, with the remainder comprising Cu and unavoidable impurities, the Na being contained in the form of at least one Na compound selected from sodium fluoride, sodium sulfide, and sodium selenide. The sputtering target has a theoretical density ratio of 90% or higher, a folding strength of 100 N/mm2 or higher, and a bulk resistivity of 1 mOmegacm or less. The number of 0.05 mm2 or larger aggregates of the at least one of sodium fluoride, sodium sulfide, and sodium selenide present per cm2 of the target surface is 1 or less on average.

The invention belongs to the technical field of superconducting wire preparation processes, and relates to a preparation method of an ultralow-loss NbTi superconducting wire, an NbTi/Cu single-core rod is prepared by a casting method, the single-core rod is cold-drawn into a fine wire, then the surface of the fine wire is uniformly plated with Ni, finally annealing heat treatment is carried out to improve the resistivity of a wire matrix, and the resistivity of the matrix is regulated and controlled by adjusting the thickness of a Ni plating layer, so that the ultra-low-loss NbTi superconducting wire is obtained. And the superfine core wire rod has excellent processing performance and ultralow loss. A multi-core secondary composite rod is prepared through 3D printing of a porous copper pipe, and finally, the 100,000-core-level NbTi superconducting wire with high critical current density and ultralow loss is successfully prepared through combination of pipe penetrating three-time composite and multiple times of aging heat treatment, and a traditional hot extrusion process is omitted in preparation of a single-core thin wire and the secondary composite rod. And the problems of high loss of the superfine core wire, poor deformation of the core wire, low yield and the like are thoroughly solved.