69results about How to "Prevent heat conduction" patented technology

A multilayer circuit substrate includes: a laminated circuit portion in which conductive layers and resin insulating layers are alternately laminated; and a metal substrate portion, wherein the laminated circuit portion is fixed to the metal substrate portion so that at least part of a lower surface of the laminated circuit portion is in contact with at least part of an upper surface of the metal substrate portion. An electronic component is mounted on the metal substrate portion.

The invention discloses a YAG fluorescent ceramic as well as a preparation method and application thereof. Light-emitting center ions of the YAG fluorescent ceramic comprise Ce<3+> and M capable of emitting red light/green light; the molecular formula is (Y1-xCex)3(Al1-yMy)5O12, wherein x is greater than or equal to 0.004 and is less than or equal to 0.5, and y is greater than 0 and is less than or equal to 0.5. The preparation method of the YAG fluorescent ceramic comprises the following steps: uniformly mixing powder of raw materials, molding to prepare biscuits and carrying out high-temperature solid-phase synthesis reaction sintering to prepare the YAG transparent ceramic. After rare earth-doped YAG transparent ceramic is encapsulated with a commercial blue light LED chip, high-qualityemitted light capable of simulating sunlight can be obtained; compared with the rare earth-doped YAG transparent ceramic prepared by a two-step method, the step of synthesizing YAG:Ce<3+>, M fluorescent powder is avoided in the reaction sintering method; the preparation method has the characteristics of simple process and low production cost.

The invention relates to octenyl succinic acid starch ester, a lipid-soluble nutrient microcapsule as well as a preparation method application of the lipid-soluble nutrient microcapsule. A preparationmethod of octenyl succinic acid starch ester comprises the step of carrying out esterification reaction on gelatinized starch and octenyl succinic anhydride in a cavitation emulsification process, soas to obtain octenyl succinic acid starch ester. According to the preparation method, the esterification reaction is promoted and intensified by virtue of the cavitation emulsification process, remarkably substitution occurs in a crystallization region and an amorphous region of the starch through the molecular collision of the collision between gelatinized starch and octenyl succinic anhydride,so that the esterification rate of prepared octenyl succinic acid starch ester is increased, and the emulsifying property is greatly improved. The method is rapid and efficient, and a hydrolysis stepis omitted after the esterification, so that the problems that molecular chains are damaged in different degrees due to the hydrolysis, the chain length and content of amylose are remarkably decreased, the compactness of a film formed by octenyl succinic acid starch ester is decreased, and the film easily absorbs moisture and conducts heat and is crispy are avoided, and the application performanceof octenyl succinic acid starch ester is improved.

The invention discloses a hybrid rocket engine igniter which comprises an igniter thread ring, an igniter box body, an igniter heat insulation layer and ignition powder. The igniter thread ring is connected with the igniter box body through a large thread, and therefore a cavity structure with inner and outer annular side walls is formed. The containing cavity is filled with the ignition powder which is composed of ignition materials and fuel. The igniter thread ring, the igniter box body and the igniter heat insulation layer are adhesively connected. The inner wall face of the igniter box body and the inner wall face of the igniter heat insulation layer are provided with fire outlet holes. A sealing belt is laid on the inner annular side wall of the igniter box body. It is ensured that the ignition powder is reliably sealed before the igniter works. One end of an igniter lead is provided with an ignition head which produces electric sparks after being powered on, and the other end of the igniter lead is provided with an electric wire. The igniter starts to work after the igniter lead is powered on. The hybrid rocket engine igniter has the advantages that the start energy is high, the energy is released rapidly, the engine ignition delay is short, and the ignition delay time of the improved igniter is shorter than 1s when a large-flow hybrid rocket engine starts.

The invention discloses a graphene electricity and heat conductive coating and a preparation method thereof. The graphene electricity and heat conductive coating is composed of the following components in parts by weight: 1-10 parts of graphene, 2-5 parts of carbon nano tubes, 2-5 parts of sodium silicate, 1-3 parts of paint oil, 1-3 parts of tung oil, 0.3-1.5 parts of maleic anhydride, 3-5 partsof a dispersing agent, 1-3 parts of acrylic resin, 0.05-0.5 part of a composite drier, 1-3 parts of a coupling agent, 0.2-1 part of silicon dioxide, 0.2-1 part of a composite additive, 0.5-2 parts ofmodified cellulose, 1.5-2 parts of zeolite powder, 1-8 parts of heat-conducting metal powder and 40-60 parts of ethanol. The graphene electricity and heat conductive coating prepared by spraying and printing can be applied to the fields of semiconductor materials, conductive and heat-conducting composite materials and the like, and has relatively strong application value.

The invention relates to a graphene/cyanate composite material and a preparation method and application thereof. The preparation method includes: mixing the graphene, graphene nanoplatelets and pi-pi small conjugate molecules with deionized water prior to performing primary dispersion; pouring a water solution to an ice bath cooled ultrasonic cell disruptor, pouring obtained dispersion liquid in liquid nitrogen for quick cooling, placing the mixture in a freeze dryer after complete freezing, and dewatering to obtain the foamed and pre-dispersed graphene/graphene nanoplatelets; finally, mixing the foamed graphene-graphene nanoplatelets with cyanate ester resin to obtain the graphene/cyanate composite material through stirring, grinding and stripping. The graphene/graphene nanoplatelets are well dispersed in the cyanate ester resin, conductivity, thermal conductivity and mechanical property are improved under low content and low viscosity, thermal expansion coefficient is lowered, and the graphene/cyanate composite material can be applied to composite components of electricity conductivity, thermal conductivity and low thermal expansion coefficient structure of space vehicles.

The invention provides a chemical nickel plating device and a chemical nickel plating method. The chemical nickel plating device comprises a groove body, an air compressor and a circulating filter, wherein the groove body is internally provided with an electrical heating pipe, and the electrical heating pipe is connected with a temperature controller arranged outside the groove body; the air compressor is connected with an air pipe, and the tail end of the air pipe extends into the bottom of the groove body; and two ends of the circulating filter are connected with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is communicated with the bottom of the groove body, and the liquid outlet pipe extends into the groove body. According to the chemical nickel plating device, the groove body is made from high-purity polypropylene, so that the defects of poor heat conductivity and poor groove body strength of the groove body are prevented; no metal substance contacts with a chemical nickel plating solution in an integral nickel plating process, so that nickel and phosphorus are prevented from being deposited in the groove body and on other parts of the chemical nickel plating device; and an obtained plating layer is bright, smooth and exquisite without pocking marks due to the effect of air stirring and circulating filtration.

Provided is a heating device capable of forming a film efficiently on a glass substrate. Also provided is a film forming apparatus having the heating device. The film forming apparatus comprises the heating device for blowing such a high-temperature gas vertically to the surface (25) of a glass substrate (24) placed on a supporting bed (26), as has a temperature higher than the softening point temperature of the glass substrate. The film forming apparatus blows such a depositing gas (43) simultaneously with a high-temperature gas to the surface of the glass substrate, as is thermally decomposed to form a film deposit.

The invention discloses a preparation method of a high-performance composite carbon felt, and particularly relates to the technical field of fiber products. The preparation method comprises the specific steps of material cleaning, PAN (polyacrylonitrile) precursor preparation, pre-oxidation, carbonization, graphitization, surface treatment and coating treatment. According to the invention, a material cleaning step is added to the composite carbon felt process, impurities in the finished carbon felt can be effectively eliminated from the source, and the influence of the impurities upon the quality of the finished carbon felt is prevented; polyacrylonitrile is dissolved using n-butyl alcohol, the characteristics of the carbon fiber and the carbon felt of the subsequent branch are ensured accordingly, the parts of the carbon felt are stressed uniformly so that the fracture caused by uneven stress at impurity positions in the traditional process is avoided, the stretching effect of the finished carbon felt in the using process is effectively improved, and the service life of the carbon felt is ensured; volatilized n-butyl alcohol vapor can be liquefied again after being cooled for secondary use, and therefore, the production cost of a manufacturer is guaranteed.

A thermal insulating structural assembly and a method for forming a thermal insulating structural assembly includes longitudinally separating an elongated metallic support beam into a first portion and a second portion, mechanically coupling the first beam portion to the second beam portion with a plurality of clamp assemblies so that the first beam portion is spaced a predetermined non-zero distance from the second beam portion and is mechanically coupled to the second beam portion only by the clamp assemblies, and introducing between the beam portions, a low thermal-conductive material at least partially thermally insulating the first beam portion from the second beam portion.

The invention provides a coil disc and an induction cooker. The coil disc comprises a coil disc support, wherein the coil disc support comprises a disc body, an edge portion of an upper surface of the disc body is provided with an annular convex rib, an upper end face of the convex rib is in matching with a lower surface of a heating panel of the induction cooker to form a heat insulation chamber between the disc body and the heating panel, a reflection layer is composited on the upper surface of the disc body, and the reflection layer is used for reflecting heat radiation generated by the induction cooker. The coil disc has multiple types of heat insulation functions, not only can heat insulation be realized through the vacuum chamber formed by the coil disc and the heating panel, but also heat radiation generated by the induction cooker can be reflected through the reflection layer arranged on the coil disc, so the induction cooker is prevented from emitting heat downwards to damage a heating assembly, service life of the induction cooker is effectively prolonged, and heat efficiency of the induction cooker is improved.

The invention provides a high-temperature solar selective absorbing coating and a preparation method thereof. According to the high-temperature solar selective absorbing coating, a metal material serves as a base material, and a metal reflection film layer, a diffusion stop film layer, an absorbing film layer and an antireflection film layer are arranged on the surface of the metal base material sequentially from inside to outside, wherein the absorbing film layer comprises four absorbing sublayers with metal contents decreasing in a gradient mode from inside to outside. The absorbing film layer comprises the four absorbing sublayers with the gradually varied metal contents, and the metal contents change in the gradient mode, so that diffusion of the coating is slight during the high-temperature work process, and the high temperature stability of the film layers is improved.

The invention provides an electricity storage device. The electricity storage device (100) is provided with a plurality of electricity storage elements (1) and a cooling module (30) which cools the electricity storage elements (1). The cooling module (30) comprises at least a cooling unit (31) which is arranged between the electricity storage elements (1) and internally contains a flameproofing agent, thereby cooling the electricity storage elements (1) by means of heat absorption during vaporization of the flameproofing agent. Consequently, the electricity storage elements (1), in which heathas been generated, are successfully cooled by the cooling unit (31) that is in contact with the electricity storage elements (1) by means of the vaporization heat at the time when the flameproofing agent contained within the cooling unit is vaporized, thereby preventing a chain of overheated states among the electricity storage elements (1).

The invention discloses a white cement clinker bleaching process high in waste heat utilization rate. High-temperature clinker discharged from a rotary kiln is guided into a water-cooling bleaching machine and a grate cooler through a distribution device; the clinker entering the water-cooling bleaching machine is subjected to water cooling to 500-600 DEG C, sent to the middle rear section of thegrate cooler from a discharging end and subjected to air cooling to 80-100 DEG C, and the cooled clinker is conveyed to a clinker silo by a chain bucket conveyor (5). The problem that heat generated in cooling of the clinker from 600 DEG C to 80 DEG C does not play a role in bleaching and is not used in water-cooling bleaching in the prior art is effectively solved. The clinker cooled to 600 DEG Cin water-cooling bleaching is further subjected to air cooling in the grate cooler to make use of high-temperature air generated in air cooling, and accordingly waste heat utilization rate is increased.

A spark plug comprising a cylindrical portion which projects into a combustion chamber from an inner wall face of an engine head when the spark plug is fixed to the engine head, wherein the cylindrical portion has one or more ventilating portion comprised of a through hole or a notch in an outer circumferential face thereof. An igniting portion projecting into the combustion chamber improves ignitability. Further, because an air-fuel mixture fed from an inlet of the internal combustion engine flows to inside of the cylindrical portion through the ventilating portion, heat of an insulator is taken away and cooled down, whereby an occurrence of pre-ignition is prevented.

The invention provides a fixed form of a hydraulic servomotor in an electro-hydraulic control system. The fixed form solves the problems of quick ageing and invalidation of a guide sleeve and a pipe joint sealing element of the hydraulic servomotor because the hydraulic servomotor close to an oil cylinder works under a high-temperature environment for a long term. The fixed form is characterized in that: a hydraulic servomotor bracket is fixed on a table top at one end of an inverse T-shaped transition plate, the hydraulic servomotor is fixed on the hydraulic servomotor bracket in an inverse mode, and one end of the transition plate is fixed on a bent plate; and a lever is provided by using an upright post of the T-shaped transition plate as a pivot (C), one end of the lever is hinged (A) with a hydraulic servomotor piston rod, the other end of the lever is hinged (B) with a driving high-pressure adjusting valve lever mechanism, and two sides of the pivot (C) are provided with equal arms. The fixed form has the advantage that the hydraulic servomotor is integrally moved outside to keep away from the oil cylinder serving as a heat source.

The invention discloses a ceramic aluminum-coated plate for IGBT packaging and a preparation method thereof, and relates to the technical field of ceramic metallization, the ceramic aluminum-coated plate comprises a ceramic bottom plate, an active metal liquid film and a composite aluminum plate, the outer surface of the ceramic bottom plate is uniformly covered with the active metal liquid film, and the ceramic bottom plate is connected with the composite aluminum plate through the active metal liquid film. According to the invention, a certain proportion of silicon carbide is added into the production raw materials of clay, quartz and feldspar of the ceramic bottom plate, so that the density, compressive strength, thermal conductivity and other properties of the composite ceramic containing silicon carbide are obviously improved, and the single component of a single ceramic bottom plate is avoided; and when the outer side of the ceramic bottom plate is covered with an aluminum plate, a composite aluminum plate composed of aluminum-magnesium alloy, industrial pure aluminum and aluminum-copper alloy is adopted, so that the corrosion resistance and the pressure resistance of the workpiece are enhanced, and meanwhile, the heat-conducting property of the workpiece is also enhanced.