233results about How to "High resistivity" patented technology

The invention provides a boron nitride / epoxy resin heat-conducting composite material as well as a preparation method and application thereof. The boron nitride / epoxy resin heat-conducting composite material comprises the following raw material components: lignosulfonate; boron nitride; deionized water; a carboxymethyl nano cellulose solution; carboxylating the carbon nanotubes; borax; an epoxy resin; 1, 1, 2-cyclohexanedicarboxylic anhydride; the catalyst is 2, 2, 4, 6-tri (dimethylaminomethyl) phenol. The invention relates to a preparation method and application of a novel h-BN (boron nitride) composite material for thermal management, in particular to a three-dimensional vertical orientation composite material prepared by using lignosulfonate (LS) modified h-BN, cellulose nanofibers (C-CNF), carboxymethyl carbon nanotubes (C-CNT) and borax (B) as raw materials and adopting an ice template method. And the filler can be used as a novel enhanced heat conduction and electrical insulation filler in epoxy resin. According to the invention, BN is firstly modified, and surface modification is carried out on BN through sodium lignin sulfonate, so that compared with direct use of unmodified BN, the problem of poor compatibility and dispersibility of BN in the composite material is solved, and the heat-conducting property of the composite material is further improved.

The invention relates to the technical field of batteries, in particular to a battery shell, a preparation method thereof and a secondary battery. The battery shell comprises a shell and a heat-conducting insulating coating covering the shell; the heat-conducting insulating coating is prepared from the following raw materials in parts by weight: 40 to 60 parts of waterborne epoxy resin, 10 to 30 parts of curing agent, 5.1 to 20.5 parts of modified filler, 0.2 to 2 parts of flatting agent and 2 to 6 parts of flame retardant; the modified filler comprises a heat-conducting filler and a silane coupling agent loaded on the heat-conducting filler; the mass ratio of the heat-conducting filler to the silane coupling agent is (5-20): (0.1-0.5). The shell is covered with the heat-conducting insulating coating, so that the insulating performance, the heat dissipation performance and the high-temperature protection performance of the battery shell can be effectively improved, the use safety of the battery is improved, and the heat management energy consumption of the battery is reduced.

The invention belongs to the field of thermal management materials, and particularly relates to insulating high-thermal-conductivity gel and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing modified copper powder, modified boron nitride and nano metal liquid drops respectively, forming a solid-liquid mixed filler by using a solid modified filler with a high heat conductivity coefficient and a liquid metal, and then adding the solid-liquid mixed filler into organic silicon gel. By utilizing the synergistic effect of the three fillers, the high heat conductivity and insulativity of the heat-conducting gel are realized, the heat conductivity coefficient of the prepared gel material is greater than 6.5 W / (m.K), and the volume resistivity is greater than 109 omega.cm; the preparation method of the insulating high-thermal-conductivity gel is simple and low in equipment requirement, and the prepared gel material is excellent in performance and suitable for industrial continuous and mass production.

The invention relates to the technical field of perovskite solar cell preparation, in particular to a bulk phase passivation perovskite light absorption layer, a solar cell and a preparation method, the bulk phase passivation perovskite light absorption layer is prepared by adopting a perovskite layer prefabricated liquid, the perovskite layer prefabricated liquid comprises (FA 0.95 MA0.05) 0.95 Cs0.05 Pb (I 0.95 Br0.05) 3 and m-F-PEACl, the molar concentration ratio of the (FA 0.95 MA0.05) 0.95 Cs0.05 Pb (I 0.95 Br0.05) 3 to the m-F-PEACl is 1.5: (0.1-1), m-F-PEACl and (FA < 0.95 > MA0. 05) < 0.95 > Cs0. 05Pb (I < 0.95 > Br0. 05) 3 are matched to form a bulk phase passivated perovskite layer, so that organic cations in the m-F-PEACl interact with uncoordinated lead ions or other defect sites in the (FA < 0.95 > MA0. 05) < 0.95 > Cs0. 05Pb (I < 0.95 > Br0. 05) 3 to form a stable complex or compound, the defect concentration in perovskite is reduced, comprehensive and effective passivation is realized, and the performance of the perovskite is improved. Therefore, the photoelectric property and the stability of the perovskite material are improved. The problem that comprehensive and effective passivation cannot be achieved through a perovskite thin film passivation method in the prior art is solved.

The invention relates to the technical field of electroslag remelting slag. The invention discloses a special slag system for an ingot pulling type electroslag remelting nitrogen-controlled austenitic stainless steel ingot, which comprises the following components in percentage by mass: 45-50% of CaF2, 25-30% of Al2O3, 15-20% of CaO, 3-6% of MgO, 5-10% of SiO2 and the balance of impurities, and the content of the impurities is less than or equal to 1%. The binary alkalinity CaO / SiO2 is 1.5 to 4; the melting point of the special slag system is 1250-1280 DEG C, the viscosity value of the special slag system at the temperature of 1600 DEG C is 0.044-0.053 Pa.s, and the resistivity of the special slag system at the temperature of 1600 DEG C is 0.51-0.55 omega.cm. According to the slag system, by optimizing the components of the slag system, the physical and chemical properties of the slag system are further improved, the slag-metal reaction is inhibited, and the production process requirements of ingot pulling type electroslag remelting large stainless steel ingots are met. The produced nitrogen-controlled austenitic stainless steel ingot is good in surface quality and free of defects such as obvious pits, slag runners and double skins; and easily oxidized elements Al and Si in the steel in the remelting process are uniformly distributed in the height direction of the cast ingot, so that the uniformity of alloy textures is ensured.

The invention relates to a high-voltage-withstanding integrally-formed inductor and a preparation method thereof.The high-voltage-withstanding integrally-formed inductor comprises a magnet and a winding, the magnet is prepared from iron-based nanocrystalline and composite powder, and the iron-based nanocrystalline comprises, by weight, 10-15% of cobalt, 7-15% of nickel, 1-3.5% of manganese, 3-6% of silicon, 0.3-1% of copper and the balance iron; the composite powder comprises any one or a mixture of more of carbonyl iron, iron-silicon-chromium and iron-silicon-aluminum. The method has the effect of improving the quality of an inductor product.

The invention belongs to the technical field of X-ray detection, and particularly relates to lead-free two-dimensional double perovskite, a preparation method of the lead-free two-dimensional double perovskite and an X-ray detector manufactured based on the perovskite. The lead-free two-dimensional double perovskite is applied to X-ray detection. According to the preparation method, histamine dihydrochloride (C5H11Cl2N3Cl), silver chloride (AgCl) and bismuth trioxide (Bi2O3) are mainly used as raw materials, a mixed solution of hydrobromic acid (HBr) and hypophosphorous acid (H2PO2) is used as a solvent, a single crystal material ((C5H9N3) 2AgBiBr8 single crystal) is prepared through a hydrothermal method, and the two sides of the single crystal are coated with silver paste to serve as electrodes, so that the direct type X-ray detector is obtained. The preparation method disclosed by the invention has the characteristics of simplicity, easiness in operation, low requirement on equipment, low cost, low energy consumption and suitability for expanded production.

The invention relates to the technical field of soft magnetic ferrite materials, and particularly discloses a NiCuZn-MgO composite material and a preparation method thereof. The NiCuZn-MgO composite material comprises main components and additives, and the main components comprise the following components in percentage by weight: 36-72 wt% of Fe2O3, 13-16 wt% of ZnO, 6-9 wt% of NiO, 3-6 wt% of MgO and the balance of CuO; based on the total weight of the main components, the additive comprises the following components in percentage by weight: 0.5 to 1.5 weight percent of Bi2O3, 0.3 to 1.5 weight percent of SiO2 and 0.3 to 1.5 weight percent of CaO. According to the NiCuZn-MgO composite material prepared by the invention, the cost of soft magnetic ferrite can be reduced, and the NiCuZn-MgO composite material has high magnetic conductivity and high Bs.

The invention belongs to the technical field of precision resistors, and particularly relates to a precision resistor alloy foil and a preparation method thereof. Aiming at the defect that the performance of the existing precise resistance alloy foil has a space for improving, the invention adopts the following technical scheme: the precise resistance alloy foil comprises the following elements in percentage by mass: 20.4-20.8% of Cr, 2.4-2.8% of Al, 1-2% of Fe, 6.5-7.0% of W, 4.2-4.7% of Ti, 3.5-3.9% of Zr, 0.2-0.6% of Ce and the balance of Ni. The preparation method comprises the following steps: preparing raw materials; smelting and casting to obtain as-cast alloy; carrying out three-way free forging after homogenizing annealing treatment; carrying out five-pass hot rolling; aging treatment is carried out after solution treatment; performing three-pass cold rolling treatment; aging treatment is carried out after solution treatment; and carrying out annealing treatment. The precision resistance alloy foil prepared by the invention has higher resistivity, lower resistance temperature coefficient and better resistance stability.

The invention relates to the technical field of epoxy resin, and discloses a polyarylamide modified boron nitride-epoxy resin composite material, hydroxylated nano boron nitride reacts with a diazo group of 4-diazo diphenylamine sulfate to obtain aminated nano boron nitride, the aminated nano boron nitride and a 3, 5-diaminobenzoic acid monomer are subjected to a polymerization reaction to obtain polyarylamide modified boron nitride, and the polyarylamide modified boron nitride-epoxy resin composite material is prepared through the following steps: reacting hydroxylated nano boron nitride with a diazo group of 4-diazo diphenylamine sulfate; the polyarylamide modified boron nitride has good compatibility with epoxy resin, amino-terminated groups can be subjected to ring-opening reaction with epoxy groups of the epoxy resin, nano boron nitride is organically combined with the epoxy resin under the bridging action of polyarylamide, covalent bonds formed between a large number of amino groups on the surface and the epoxy resin in the curing process, and the epoxy resin can be cured to form the epoxy resin. The interface thermal resistance of the filler and the epoxy resin is reduced, the superhigh resistivity of the nano boron nitride, the reduction of agglomeration and the modification of the filler enable the polyarylamide modified boron nitride-epoxy resin composite material to show excellent thermal conductivity.

The invention discloses a TBC battery structure, a preparation method thereof and a TBC battery, in the structure, a P region and an N region are respectively provided with a P-type / N-type doped polycrystalline silicon passivation layer, and an oxygen-doped polycrystalline silicon layer is arranged between the P region and the N region. The preparation method comprises the step of preparing the P-type / N-type doped polycrystalline silicon passivation layer and the oxygen-doped polycrystalline silicon layer on the P region and the N region. In the structure, the oxygen-doped polycrystalline silicon layer is arranged between the P region and the N region, so that the P region and the N region can be effectively separated, an excellent shadow shielding resisting function of a corresponding assembly can be realized, and the generating capacity of the assembly in a shadow shielding environment can be further improved. According to the preparation method, the design of depositing multiple tunneling oxide layers and polycrystalline silicon layers at a time, the design of a laminated mask, a new isolation mode, an efficient cleaning process and the like are adopted, the problems that an existing TBC battery preparation process is tedious, boron-doped polycrystalline silicon laser ablation residues exist, the investment and generation cost is high and the like are effectively solved, and the preparation method is a brand-new TBC battery route.

The invention relates to the technical field of dielectric energy storage device materials, in particular to high-entropy designed bismuth ferrite-based energy storage ceramic as well as a preparation method and application thereof, the chemical composition formula of the material is (0.7-x) Bi < 0.9 > (Sm < 0.5 > Gd < 0.5 >) < 0.1 > FeO < 3-0.3 > (Sr < 0.5 > Ba < 0.5 >) TiO < 3-x > NaNbO < 3-y > MnO < 2 >, the value range of x is 0-0.15, and the value range of y is 0-0.005. The relaxation ferroelectric material is designed by adopting a high-entropy strategy, and various elements occupy the same site of the material to generate lattice distortion, so that the relaxation characteristic of bismuth ferrite-based ceramic is promoted, and a ferroelectric hysteresis loop is optimized. The NaNbO3 anti-ferroelectric material is introduced, the long-range ferroelectric order is destroyed, the local random field is enhanced, and a low Pr value can be obtained. And in addition, the concentration of oxygen vacancies can be reduced by properly adding 0.5% mol of MnO2, so that the leakage current of the material is reduced, the energy storage efficiency is improved, and the material design not only enriches the application field of the high-entropy ceramic, but also provides a new thought for improving the performance of the energy storage ceramic.

The invention discloses potassium-sodium niobate lead-free transparent ferroelectric ceramic and a preparation method thereof, and belongs to the technical field of ceramic materials. The chemical general formula of the potassium-sodium niobate lead-free transparent ferroelectric ceramic is (K < 0.48 > Na < 0.52 >) NbO < 3-x > La < 2 > O < 3 >, and x represents the mole number of lanthanum oxide La < 2 > O < 3 > and ranges from 0.005 to 0.04. The preparation method of the potassium-sodium niobate lead-free transparent ferroelectric ceramic comprises the following steps: S1, weighing raw materials; s2, carrying out primary ball milling on the raw materials; s3, pre-sintering the primary mixed powder material; s4, carrying out secondary ball milling on the pre-sintered material; s5, adding a polyvinyl alcohol aqueous solution into the secondary mixed powder for granulation; s6, sieving the granulated powder materials; s7, the fine powder is subjected to tabletting and glue discharging treatment in sequence; s8, sintering the ceramic body; and S9, plating a silver electrode on the ceramic body, and applying voltage for polarization. By adopting the potassium-sodium niobate lead-free transparent ferroelectric ceramic and the preparation method thereof, the transparent ferroelectric ceramic material with high compactness and low dielectric loss is obtained, and has the advantages of good comprehensive properties of light transmission and ferroelectricity.

The invention discloses low-loss superfine soft magnetic alloy powder and a manufacturing method and application thereof, belongs to the technical field of soft magnetic materials, and particularly relates to a method for preparing superfine alloy powder by smelting iron, nickel, manganese, aluminum, silicon and chromium into alloy and adopting an evaporation condensation method. Then coating the surface of the superfine alloy powder with a phosphating film by using a medium-temperature zinc-manganese phosphating solution and a phosphating auxiliary agent, and then coating with a silicon dioxide layer to obtain coated low-loss superfine soft magnetic alloy powder; wherein the phosphating auxiliary agent at least comprises a sodium sulfonate derivative, and in the preparation of the sodium sulfonate derivative, azelaic acid dichloride and 1-octylene-3-alcohol are subjected to a reaction, and then sodium hydrogen sulfite is added for a reaction to obtain the sodium sulfonate derivative. The D50 particle size of the prepared low-loss superfine magnetically soft alloy powder ranges from 100 nm to 3000 nm; the resistivity is high, and the resistivity reaches 9.0 omega.cm or above; and the power loss is low and is lower than 320.3 mW / cm < 3 >, and the method can be used for preparing a high-performance inductor.

The invention discloses an anti-puncture zinc-bromine flow battery diaphragm and a preparation method and application thereof.The anti-puncture zinc-bromine flow battery diaphragm is prepared from ultra-high molecular weight polyethylene, a plasticizer, a pore-forming agent, color master batch, a bromine-resistant agent and a lubricant, the pore-forming agent is composed of first inorganic nanoparticles and second inorganic nanoparticles, and the second inorganic nanoparticles are composed of first inorganic nanoparticles and second inorganic nanoparticles; the second inorganic nanoparticles are inorganic nanoparticles with an intrinsic regular pore structure. According to the zinc-bromine flow battery diaphragm disclosed by the invention, the second inorganic nanoparticles with the angstrom-level intrinsic regular pore channel structure are selected to generate a synergistic effect with the first inorganic nanoparticles in the diaphragm, so that a multi-scale cavernous body three-dimensional network structure is jointly formed, the average pore size of the diaphragm is reduced, and the bromine resistance of the diaphragm is favorably improved; and the coulombic efficiency of the battery is improved.

A particle beam microscope includes: an electron beam source for generating an electron beam; a beam tube (245) having an electrically conductive inner side surface, a first end and a second end, where the electron beam enters the first end of the beam tube (245) and exits the second end of the beam tube (245); a magnetic objective (240) for focusing the electron beam in an object plane, the magnetic objective (240) having a magnetic coil (243) and a pole shoe (241) having two pole ends, each pole end extending around an axis of symmetry of the magnetic objective (240); a potential supply system (262) configured to feed a potential to the electrically conductive inner side surface of the beam tube (245); wherein the beam tube (245) comprises an electrically insulating body having an inner wall and an outer wall, where an electrically conductive layer (211) is provided on the inner wall of the electrically insulating body, the electrically conductive layer forming an electrically conductive inner side surface of the beam tube (245), and where the electrically conductive layer (211) is formed from electroless nickel plating.

The invention discloses a low-cost production method of high-performance non-oriented electrical steel. The high-performance non-oriented electrical steel comprises the following main chemical components: less than or equal to 0.002% of C, 1.0-1.7% of Si, 0.20-0.80% of Mn, 0.01-0.10% of P, less than or equal to 0.001% of S, less than or equal to 0.002% of N, less than or equal to 0.001% of Ti, less than or equal to 0.002% of Nb, less than or equal to 0.002% of V, 0.20-1.0% of Als and 0.10-0.20% of Sb. The resistivity is improved through component adjustment, and the eddy-current loss is reduced; segregation elements are added, and the product texture is optimized; complete recrystallization and grain growth in the non-oriented silicon steel hot rolled plate are realized through controlled rolling and controlled cooling; the recrystallization structure and the texture of a finished product plate are optimized through the continuous annealing process, the magnetic performance is improved to be higher than the level of the same kind of normalized materials, and finally efficient material production of the normalizing removing procedure is achieved; the production efficiency is improved, and the resource consumption is reduced.

The invention discloses a boron nitride conductive ceramic evaporation boat and a preparation method thereof. The boron nitride conductive ceramic evaporation boat comprises the following raw materials in parts by weight: 80-100 parts of boron nitride, 30-40 parts of titanium boride, 30-40 parts of zirconium silicate, 10-15 parts of boron oxide, 10-15 parts of nano carbon black, 8-12 parts of silicon carbide, 4-6 parts of nano yttrium oxide and 1-2 parts of polyacrylamide. The preparation method comprises the following steps: (1) weighing the raw materials, and uniformly mixing; (2) wet ball milling; (3) drying; (4) cold isostatic pressing forming; and (5) carrying out hot pressed sintering and cooling. The long-term stability of the product is improved, the produced product has advanced performance and quality, shorter preheating time, better molten aluminum spreading capacity, fewer sputtering and boat bending problems, longer service life and more economic choices, production of various materials such as metallized films, paper and textiles can be met, and the production cost is reduced. The aluminum-plated film is widely applied to the industries of vacuum evaporation packaging materials, capacitor metallization vacuum coating, paper aluminum plating, gold stamping plating, anti-counterfeiting mark aluminum plating and the like.

The invention discloses a loss characteristic negative temperature coefficient integrally-formed inductor and a preparation method thereof, and the method comprises the steps: preparing soft magnetic metal powder: carrying out passivation, coating, granulation and lubricant adding treatment on carbonyl iron powder and gas atomization iron nickel powder, and obtaining two kinds of soft magnetic metal powder; pressing the treated atomized iron-nickel powder to serve as a middle column of the integrally-formed inductor, and performing heat treatment; the middle column is bonded in the coil; and embedding the coil into the treated carbonyl iron powder, carrying out compression molding, and baking to obtain the iron core. The obtained integrally-formed inductor is high in inductance value, the loss of the integrally-formed inductor cannot be increased along with temperature rise, the conversion efficiency of the integrally-formed inductor at the temperature of 100 DEG C is higher than 25 DEG C, and the integrally-formed inductor has the advantages of being high in inductance and loss negative temperature coefficient.

The embodiment of the invention relates to the technical field of monocrystalline silicon preparation, and provides a crystal pulling control method which at least can improve the axial resistivity uniformity of a monocrystalline silicon rod. The control method comprises the following steps: acquiring a prediction curve, wherein the prediction curve is expressed as a change curve of resistivity corresponding to different equal-diameter lengths of a silicon single crystal rod comprising a first dopant; obtaining a preset isodiametric slope table based on the prediction curve, the preset isodiametric slope table and corresponding preset process parameters, wherein the preset process parameters comprise a power ratio of the set power of the upper heater to the set power of the lower heater; the preparation method comprises the following steps: preparing a target monocrystalline silicon rod, adding a silicon material and a first dopant into a crucible, sequentially carrying out a melting process, a seeding process, a shouldering process and an equal-diameter process to obtain an initial monocrystalline silicon rod, adjusting process parameters of the equal-diameter process according to preset process parameters, and after the equal-diameter length of the initial monocrystalline silicon rod reaches a target length, carrying out continuous casting on the target monocrystalline silicon rod to obtain the target monocrystalline silicon rod. And entering an ending process to obtain the target single crystal silicon rod.

The invention discloses a high-resistivity sintered NdFeB permanent magnet material and a preparation method thereof, which relates to the technical field of permanent magnet materials. The material is prepared from the following raw materials in parts by mass: 95.0-99.9 parts of base alloy fine powder, 0.1-5 parts of rare earth fluoride powder, 0.1-0.3 parts of antioxidant, 0.2-1.2 parts of lubricant, 0.2-5 parts of aviation gasoline and 0.1-0.5 parts of nanomaterial; the composition of the base alloy fine powder is (PrNd) a (TM) b (HM) c Ga d B e Fe 100‑a‑b‑c‑d‑e , 29.5≤a≤32.5, 0<b≤5, 0<c≤0.8, 0.3≤d≤0.5, 0.88≤e≤0.94, wherein TM is one or more of Al, Cu, Co, and Mn, and HM is one or more of Nb, Zr, Hf, Ti, and V. The permanent magnetic material has high resistivity and excellent comprehensive magnetic properties.

The invention discloses a silicon carbide ceramic material and a preparation method thereof, and relates to the technical field of ceramics. When the silicon carbide ceramic material is prepared, firstly, apricot shell carbon, nano silicon dioxide and sodium salt are mixed and calcined in a nitrogen atmosphere, and a modified silicon carbide composite nanowire is prepared; modifying the modified silicon carbide composite nanowire and praseodymium powder by a molten salt method to prepare a praseodymium modified silicon carbide composite nanowire; liquid polycarbosilane, the praseodymium modified silicon carbide composite nanowire, a modification additive, silicon carbide particles and a sintering additive are subjected to wet ball milling, mixing and curing, and then composite sintering powder is prepared; and sintering the composite sintered powder by a spark plasma sintering method, and then annealing in an argon atmosphere to prepare the silicon carbide ceramic material. The silicon carbide ceramic material prepared by the invention has the advantages of high thermal conductivity, electromagnetic shielding, high strength and high compactness.

The invention provides an integrated antenna module with thermal management. The module comprises at least one antenna and an amplifier such as a power amplifier or a low noise amplifier. And an anisotropic thermal interface material that is thermally conductive with other components. Wherein the anisotropic thermal interface material comprises a plurality of thermally anisotropic composite layers aligned with each other, having a first thermal conductivity in a first direction, having a second, higher thermal conductivity in a second direction, and exhibiting a parallel extension in the first direction. These thermally anisotropic composite layers comprise a hexagonal boron nitride and a binder and are aligned in a second direction perpendicular to the first direction such that the x-y plane of the hexagonal boron nitride may also be aligned in the second direction, whereby the thermal conductivity in the second direction is at least 13.5 W / mK and has a dielectric constant of less than 4 and a loss tangent of less than 0.007.

The invention relates to a preparation method of a high-conductivity heat-resistant aluminum alloy wire, and belongs to the technical field of aluminum alloy wires. The aluminum-iron alloy, the aluminum-boron alloy, the aluminum-yttrium alloy, the rare earth alloy and the aluminum-zirconium alloy are added into the aluminum ingot, it is ensured that aluminum alloy melt has the proper trace element content, and the trace elements can effectively improve the electric conductivity and heat resistance of the aluminum alloy; the on-line refining agent and aging treatment are applied to further refine grains, and the obtained monofilament has more excellent resistivity and heat resistance under the condition that the strength is kept, keeps the strength at high temperature and has excellent tensile strength.

This application discloses a soft magnetic powder composite, a magnetic powder core material, and an insulating coating method based on organic growth, belonging to the field of soft magnetic materials technology. The soft magnetic powder composite of this application includes soft magnetic powder and an insulating coating layer, with the insulating coating layer encapsulating the soft magnetic powder. The insulating coating layer is prepared by a crosslinking reaction of dopamine hydrochloride (hereinafter referred to as dopamine) and polyethyleneimine. The soft magnetic powder is selected from metals and / or alloys containing Fe. The insulating coating method of this application has low hazard, achieves high stability within a certain temperature range, features scalable and controllable insulating film thickness, high film uniformity, and effectively isolates interparticle eddy currents. Simultaneously, the insulating coating layer has strong adhesion, reducing the amount of insulating adhesive used, facilitating molding, reducing the dilution effect of non-magnetic phases, and further improving the magnetic properties of the matrix.

The invention discloses a silicon single crystal rod and a preparation method thereof, a silicon wafer and a solar cell, and belongs to the technical field of photovoltaic module preparation. The single crystal silicon rod contains an antimony element and a hydrogen element, the doping concentration of the antimony element in the single crystal silicon rod is Ca, the doping concentration of the hydrogen element in the single crystal silicon rod is Cb, and Ca / Cb is greater than or equal to 1E <-3 > and less than or equal to 4E + 2. According to the silicon single crystal rod provided by the invention, the antimony and the hydrogen are doped at the same time, and the effective segregation coefficient of the antimony in the crystalline silicon is improved through the interaction of the hydrogen and the antimony, so that the resistivity change uniformity of the silicon single crystal rod is improved, the oxygen content of the silicon single crystal rod is improved, the service life of the silicon single crystal rod is prolonged, and the resistivity is accurately controlled; the resistivity of the monocrystalline silicon rod and the derivative product thereof is more uniform and concentrated, and the performance and the production efficiency of the czochralski monocrystalline silicon and the battery can be effectively improved.

The invention relates to the field of conductive contact manufacturing, in particular to a novel anti-oxidation contact which comprises a silver conductive layer arranged on a circuit board base material, and the silver conductive layer is covered with a resistance layer with anti-oxidation performance. And the resistance layer is made of ruthenium resistance paste. The conductive contact has the advantage that the production cost of the conductive contact is reduced.

The present invention relates to the technical field of automobile insulating coatings, and in particular to an automobile insulating coating and a preparation method thereof. The automobile insulating coating comprises the following raw materials in parts by weight: 80-100 parts of modified acrylic resin, 15-18 parts of modified silicon dioxide, 2-3 parts of dispersant, 0.5-0.7 parts of defoamer, 0.3-0.5 parts of leveling agent, and 80-100 parts of deionized water. The present invention also provides a preparation method of the insulating coating, and the obtained coating has good insulation and excellent water resistance, wear resistance and impact resistance.

The invention discloses a high-voltage-resistant metal frame structure in-situ coated amorphous powder material for an inductor and a preparation method of the high-voltage-resistant metal frame structure in-situ coated amorphous powder material. The surface of the amorphous powder material is coated with an inorganic metal frame structure serving as an insulating layer in situ. According to the invention, the amorphous powder material is coated in situ through the metal frame structure with the pore structure, so that the pressure resistance and chemical stability of an inductor product can be greatly improved, and the light weight of the inductor can be effectively realized; the method disclosed by the invention is simple, convenient to operate and good in coating effect, can realize industrialization, and has a great application prospect in the field of high-frequency inductors.

The present invention discloses a liquid crystal compound and a composition with high-definition bright spots and low dielectric loss, as well as a high-frequency component containing the composition. The structure of the liquid crystal compound is shown in the general formula (I): wherein ring A and ring B are cyclohexyl, cyclohexenyl or benzene ring respectively; X 1 ~X 4 One of them is a methyl group, and the rest are hydrogen atoms; R is a straight-chain alkyl group, a straight-chain alkoxy group, a straight-chain fluoroalkyl group having 1 to 9 carbon atoms, or an alkenyl group or alkenyloxy group having 2 to 9 carbon atoms; m and n are 0 or 1; and the composition contains 1% to 40% of the compound represented by the general formula (I). The liquid crystal compound of the present invention has an extremely high clearing point and extremely low dielectric loss. The liquid crystal composition containing the compound of the present invention has an extremely high clearing point, and the temperature sensitivity of the dielectric properties is greatly reduced, which is very suitable for high-frequency devices working in high-temperature environments.