59results about How to "Good expansion coefficient" patented technology

The invention discloses a sealing gasket covered with carbon-fiber covering yarn. The sealing gasket comprises two mixed padding layers, a reinforcing fiber layer and a carbon-fiber covering yarn layer, wherein the reinforcing fiber layer is located between the two mixed padding layers, and the carbon-fiber covering yarn layer is arranged at the outer side of the sealing gasket in a covering manner. The sealing gasket is made of polytetrafluoroethylene, nitrile rubber, graphite, natural rubber, coke powder, vermiculite powder, barite powder, aramid fibers and glass fibers, and therefore the sealing gasket has the beneficial effects of being quite low in friction coefficient, quite good in high temperature stability and heat shock resistance, quite high in strength and heat conductivity coefficient, low in expansion coefficient, quite high in electrical resistivity, resistant to corrosion and capable of allowing microwaves or infrared rays to permeate and the like, the natural rubber is quite high in elasticity, and therefore the sealing gasket is quite good in elasticity and plasticity; the periphery of the sealing gasket is covered with the carbon-fiber covering yarn layer, and therefore the sealing gasket has the beneficial effects of being quite high in acid resistance, alkali resistance, corrosion resistance and abrasion resistance; and in addition, the sealing gasket is subjected to vulcanization treatment, so that the sealing gasket is durable and not prone to aging.

The invention relates to a halogen-free electronic material composition which has the characteristics of low dielectric constant and small dissipation factor. The halogen-free electronic material composition comprises (a) styrene-maleic anhydride copolymer, (b) polybenzoxazine, (c) flame retardant and (d) additives. The electronic material composition can be used as a material of a high-frequency copper foil substrate.

The invention provides ancient green crackled glaze for ceramic decorations and a preparation method of the ancient green crackled glaze. The ancient green crackled glaze comprises the following components: 50-70 percent of nepheline orthoclase, 10-15 percent of talc, 10-15 percent of CaCO3, 3-8 percent of MgCO3, 4-8 percent of kaolin and 0.5-1.0 percent of CuCO3. The preparation method comprises the following steps of: weighing all the components, then sufficiently mixing the components, adding the mixture to a grinder, adding water which accounts for 50-60 percent of the dry powder, grinding for 5-12 hours, testing the granularity, and screening the ground mixture by using a 350-mesh screen, wherein residues are about 1-3g; and then blending the concentration of the ground glaze to true specific gravity at 42-45 DEG C, spraying or soaking the glaze onto a ceramic product, airing, then feeding the ceramic product into a kiln, carrying out glaze firing at 1185-1200 DEG C for 9-10 hours, finally naturally cooling and discharging the finished product from the kiln. The prepared ancient green crackled glaze is fine and soft in glaze surface, rich in texture and ancient in color and luster.

The invention provides a high-strength medium-temperature crackle glaze ceramic product which comprises a body material and glaze, and the body material comprises the following raw materials: kaolin, quartz, potassium feldspar, clay, talc and ceramic micro-powder; and the glaze is prepared from the following raw materials: potassium feldspar, albite, kaolin, dolomite, quartz, barium carbonate, zinc oxide, copper oxide, aluminum oxide, heavy calcium carbonate and plant ash. The manufacturing method of the high-strength medium-temperature cracked glaze ceramic product comprises the following steps: respectively mixing a body material and a glaze material, adding water, performing wet milling by using a ball mill, and sieving to obtain body material slurry and glaze slurry; preparing blank biscuit firing from the blank slurry; glazing; and sintering. The ceramic product prepared by medium-temperature firing is short in firing time and low in temperature, so that the energy consumption is low, the rate of finished products is high, and the production cost is reduced; and meanwhile, the glaze surface is very special in cracking, uniform and clear in lines, and full of the glaze surface, thereby giving a special aesthetic feeling to people.

The invention relates to the technical field of metal-based composites and particularly relates to a high-thermal-conductivity particle reinforcement Al-based composite and a preparing method thereof.The high-thermal-conductivity particle reinforcement Al-based composite comprises reinforcing particles and aluminum alloy, wherein the reinforcing particles are uniformly distributed in an aluminumalloy base body and form great interface bonding with the base body; and the mass ratio of the aluminum alloy to the reinforcing particles is 100:(1-30). The preparing method has the advantages that the mass ratio of the aluminum alloy to the reinforcing particles is optimized, the quantity of each component in the aluminum alloy is controlled, and the thermal conductivity of the aluminum alloy and the reinforcing particles is controlled; and the obtained Al-based composite has high thermal conductivity and great comprehensive mechanical properties.

The invention discloses an integrated soluble bridge plug and a preparation method thereof. The integrated soluble bridge plug includes a soluble bridge plug, the soluble bridge plug sleeves a tension rod, a ball seat is arranged between the soluble bridge plug and the tension rod, a lower joint is arranged at one end of the tension rod, a clamping tile is arranged between the lower joint and the soluble bridge plug and sleeves the tension rod, and the soluble bridge plug is of a composite structure and made of rubber and vertebral vulcanization. The integrated soluble bridge plug is small in volume, large in diameter, simple in structure and high in dissolution speed.

The invention discloses high-thermal-conductivity low-porosity graphite for a curved glass hot bending mold. The thermal conductivity is not lower than 94W/(m.K), the porosity is not higher than 20%,the thermal expansion coefficient is not higher than 5.8 * 10<-6>/DEG C, and the average particle size is not higher than 5mu m. The preparation method of the graphite comprises the following steps: preparing petroleum coke powder, crystalline flake graphite powder and modified asphalt powder into modified asphalt coke flake powder, uniformly mixing the modified asphalt coke flake powder with modified mesocarbon microbeads, crushing, standing, carrying out isostatic pressing molding, roasting carbonization, dipping treatment and graphitization treatment to obtain the high-thermal-conductivitylow-porosity graphite. According to the graphite material, the petroleum coke powder is used as a main material, the modified asphalt mesocarbon microbeads and crystalline flake graphite are used as auxiliary materials, aggregate types and proportions are reasonably matched, mirror surface heat conduction, pores and expansion coefficients of the processed graphite material can be improved, the average particle size of the graphite material is not larger than 5 micrometers, and the graphite material can be applied to curved glass hot bending molds.

The invention belongs to the technical field of fingerprint identification and relates to magnetic fingerprint revealing powder and a preparation method and application thereof. The magnetic fingerprint revealing powder is composed of magnetic powder and developing powder, and a chemical formula of the magnetic fingerprint revealing powder is Ma(BN)b, wherein M refers to the magnetic powder selected from at least one of Fe powder, Co power, Ni powder, Fe3O4 or Fe78Si9B13 amorphous powder, B refers to the developing powder, a and b refer to atom percentage contents of corresponding elements, a is larger than or equal to 50 and smaller than or equal to 88.9, b is larger than or equal to 11.1 and smaller than or equal to 50, and the amount of a and b is 100. Compared with the prior art, the magnetic fingerprint revealing powder not only has the advantages of easiness in raw material acquisition, simplicity in preparation, stability in performance, easiness in storage and the like but also has no toxic or side effect on users and has a most prominent advantage that high-precision reveal of fingerprints on the surfaces of various objects in dry or humid environment can be realized. Therefore, the preparation process is simplified on the premise of high revealing precision of the magnetic fingerprint revealing powder, and the magnetic fingerprint revealing powder is widely applicable to various complicated environments and has an extremely high practical application value.

The invention relates to a micro-channel plate cladding glass, a micro-channel plate, and a preparation method thereof. The micro-channel plate cladding glass comprises the following components in parts by weight: 52 to 57 parts of SiO2, 0 to 2 parts of Al2O3, 1 to 4 parts of B2O3, 15 to 18 parts of Bi2O3, 5 to 7 parts of SnO2, 2 to 4 parts of In2O3, 0.5 to 2 parts of Sb2O3, 8 to 10 parts of Na2O and Cs2O, and 6 to 8 parts of MgO, CaO, and BaO. The micro-channel plate cladding glass and micro-channel plate prepared therefrom have the characteristics of non-toxicity, innocuousness, and environment-friendliness.

The invention provides a preparation method of a coated filler slurry composition, a prepreg comprising the slurry composition, a laminated board and a printed circuit board. The preparation method comprises the following steps: mixing master batch filler with an organic solvent and a dispersant, mechanically stirring and uniformly dispersing the mixture, and further dispersing the mixed liquid through dispersing equipment to prepare prefabricated slurry; adding a catalyst into the prefabricated slurry, uniformly mixing the mixture, and marking the mixture as a liquid A; dissolving a coating agent in an organic solvent to prepare a solution, and marking the solution as a liquid B; adding the liquid B into the liquid A while stirring, and performing a reaction to obtain a reaction mixed solution; and storing the reaction mixed solution at normal temperature for 1-30 days to obtain the coated filler slurry composition. The coated filler slurry composition prepared by the invention can improve the dispersibility and flowability of the integral slurry composition and improve the resin flowability in a high filler filling state. The copper coated laminated board manufactured by the slurry composition has relatively good heat resistance and low coefficient of thermal expansion and good comprehensive performance.

The invention discloses an LTCC-based novel semi-lumped one-to-three filter power divider, and belongs to the technical field of microwave. The filter power divider comprises a semi-lumped bandpass filter and a same-phase three-path power divider, and the novel filter power divider is successfully achieved by abutting of an output end of the bandpasss filter and an input end of the same-phase power divider. The bandpass filter employs a semi-lumped structure, and the same-phase power divider is a one-to-three equal power divider. Three-dimensional integration is achieved by a low-temperature cofiring ceramic (LTCC) process, and the filter power divider has the advantages of good port isolation degree, low insertion loss, good return loss, small size, favorable electrical performance, highintegration, high finished rate, low expansion coefficient and the like and has favorable application prospect in the field of a communication system radio-frequency front-end circuit and a radar system which are relatively high in miniaturization requirement.

The present invention relates to a LED heat emission pattern assembly with high efficiency, and the heat emission pattern assembly directly makes an electric insulation heat conducting layer with diamond element on the heat absorbing end face of the radiator. The metal circuit layer can be provided with one or a plurality of LED components. The pattern assembly structure of the heat emission glue is not used, the present invention solves the problems of heat emission, blocking and piling to keep that the LED works in a normal temperature.

The invention discloses lead-free transparent frit for preparing ceramics, and particularly relates to the field of ceramic preparation. The lead-free transparent frit comprises main ingredients and accessory ingredients, wherein the main ingredients mainly comprise SiO2, B2O2, Al2O3, ZnO, Li2O, Na2O, MgO, K2O and CaO, and the accessory ingredients mainly comprise SrO, Bi2O3, Re, nitrate, titaniumpowder and vanadium pentoxide. Firing is conducted by using a lithium-containing compound or mineral spodumene and Suzhou soil as raw materials, a chemical substances formed through firing replaces PbO in lead-containing glaze, and the minimum eutectic mixture is formed together, and therefore, lead oxide is replaced. A low glaze firing temperature and a wide firing range are ensued, the glaze glossiness can be ensured, and matching of the expansion coefficient can be ensured. Li2O is an oxide with a strong melting function, the expansion coefficient of the glaze can be significantly reduced,and the durability is improved; when the Li2O is added into the frit, the lead-free transparent frit which is high in elasticity and high in glossiness can be obtained at a low glaze firing temperature, B2O2 can obviously reduce the melting temperature and the viscosity of the frit, and the B2O2 can be used as a strong fluxing agent.

The invention discloses a ceramic grinding segment for a cement grinder and a preparation method of the ceramic grinding segment. The ceramic grinding segment is prepared from the following components in percentage by weight: 92 to 95% of alumina, 0.5 to 2% of tungsten carbide, 0.8 to 3% of calcium carbonate, 1 to 1.2% of magnesium carbonate, 0.5 to 2% of titanium nitride, 1 to 3% of silicon dioxide, and 0.8 to 1% of zirconia, wherein the ceramic grinding segment for the cement grinder is in a shape of a cylinder, a spherical column combination, a spindle or a frustum of a square pyramid which is symmetrical up and down. The preparation method of the ceramic grinding segment is characterized by carrying out press forming and then high temperature sintering, and comprises the processes of material preparation, ball milling, spray granulation, silo aging, profiling, high temperature sintering, powder removing and polishing, drying of a finished product and the like. The density of the finished product is only half of a steel material, so as to be capable of effectively saving electricity and energy and reduce carbon emission. The finished product further has high hardness, good abrasion resistance, low material consumption, good economy, high temperature resistance, capability of working at high strength for a long time, good toughness, difficult breaking and collapse while being impacted, excellent practicality, good binding force and easier forming.

The invention discloses a carbon fiber coated seal gasket. The seal gasket comprises a carbon fiber layer on the periphery, mixed material layers in the middle and a reinforced fiber layer between the mixed material layers. By adopting hexagonal system boron nitride, the seal gasket is low in friction coefficient, high in high-temperature stability, heat shock resistance and strength, large in heat conductivity coefficient, small in dilatation coefficient, large in specific resistance, resistant to corrosion and capable of transmitting microwaves or infrared rays and has high elasticity and plasticity as rubber is high in elasticity. The periphery of the seal gasket is coated with the carbon fiber layer, and the seal gasket is high in acid and alkali resistance, corrosion resistance and abrasion resistance and is not prone to ageing and durable as the seal gasket is sulfidized.

The invention discloses a preparation method of a high-temperature resistant and anti-abrasion-and-corrosion gradient coating used for a circulating fluidized bed boiler. The preparation method includes the steps that firstly, sand blasting roughening is performed on the surface of a circulating fluidized bed boiler part; secondly, the surface subjected to sand blasting roughening is washed with acetone and ethyl alcohol successively and is dried; thirdly, a NiCrBSi intermediate coating is sprayed on the roughened and cleaned surface in a plasma spraying manner, then Cr3C2-NiCr-BN-Si3N4 particles are sprayed in a plasma spraying manner, and the conditions of a plasma spraying process includes that the main gas pressure is 0.7-1.0 MPa, the auxiliary gas pressure is 0.6-0.9 MPa, the main air flow is 1300-1800 l/h, the auxiliary air flow is 900-1100 l/h, the arc current is 450-600 A, the arc voltage is 85-100 V, the powder feeding gas pressure is 0.2-0.4 MPa, the powder feeding gas flow is 280-400 l/h, the spraying distance is 100-150 mm, the spraying speed is 2-3 kg/h, and the coating thickness is 1-2.5 mm. The coating can be resistant to high temperature corrosion and high temperature abrasion and corrosion when used for the circulating fluidized bed boiler, and the coating is firm and cannot fall.

The invention discloses a nitrogen-containing austenitic stainless steel flux-cored wire with high strength and pitting corrosion resistance. The flux-cored wire is composed of flux-cored powder and a stainless steel band wrapping the flux-cored powder, and is characterized in that the flux-cored powder is composed of alloy components and slag system components, and the alloy components of the flux-cored powder comprise, by mass, 1.5wt%-3wt% of electrolytic manganese, 0.5wt%-1wt% of silicon iron, 20wt%-22 wt% of chromium powder, 12.5wt%-20wt% of nickel powder, 0.2wt%-3.5 wt% of ferromolybdenum, 0.1wt%-2.0 wt% of copper powder, 0.1wt%-5wt% of chromium nitride and the balance iron powder and inevitable impurities. According to the flux-cored wire, the design scheme of multi-element composite slag system coupling protection is adopted, and escape of the nitrogen element in the welding process of nitrogen-containing austenitic stainless steel is inhibited while the weldability is not affected and the welding process difficulty is not increased.

The invention relates to the field of sucker rods, in particular to a high-temperature-resistant coated sucker rod. The sucker rod is composed of at least one sucker rod unit section. Each sucker rodunit section comprises a convex port, a concave port and a cylindrical rod, wherein the convex port and the concave port are fixedly arranged at the two ends of the cylindrical rod correspondingly. Ahigh-temperature-resistant layer is arranged on the outer surface of each sucker rod unit section. The high-temperature-resistant layers are prepared from modified polyimide. The problem that the surface of the sucker rod is hot in long-time work is solved. The high-temperature-resistant coated sucker rod has the following advantages that (1) the sucker rod is composed of the at least one sucker rod unit section, and pipe connecting and dismounting are convenient; and (2) the high-temperature-resistant layers are arranged, high temperature can be isolated outside the sucker rod, and the situation that the sucker rod deforms or influences the oil pumping quality due to accumulation of a large amount of heat during use is avoided.