55 results about "Thermal conductivity" patented technology

The present invention is directed to a reversibly adhesive thermal interface material for electronic components and methods of making and using the same. More particularly, embodiments of the invention provide thermal interface materials that include a thermally-reversible adhesive, and a thermally conductive and electrically non-conductive filler, where the thermal interface material is characterized by a thermal conductivity of 0.2 W/m-K or more and an electrical resistivity of 9×10¹¹ ohm-cm or more.

Provided are a polyimide tube including a polyimide resin composition, wherein the polyimide resin composition contains a polyimide resin in which an acicular highly thermally conductive filler such as carbon nanotubes is dispersed in 15 volume percent or more relative to the total volume of the composition; the acicular highly thermally conductive filler has an orientation of 1.3 or more, the orientation being represented by the modulus of elasticity of the polyimide resin composition in the circumferential direction/the modulus of elasticity of the polyimide resin composition in the axial direction; and the polyimide tube has high thermal conductivity, is excellent in terms of mechanical strength and indentation strength, and provides a high fixing property and an excellent offsetting property; a process for producing such a tube; and a fixing belt including such a tube serving as a base member.

An automotive lamp includes a semiconductor light emitting device used as a light source and bracket used as a support member supporting the semiconductor light emitting device. The bracket includes a first heat-transfer member having an isotropic thermal conductivity in at least part of region in contact with the semiconductor light emitting device, and a second heat-transfer member having an anisotropic thermal conductivity in a region in contact with the first heat-transfer member.

In an infrared detection sensor according to the present invention, all material constituting an upper portion of a sensing electrode in a supporting arm region is removed so that a supporting arm has low thermal conductivity. As a result, thermal conductivity of the infrared sensor structure is reduced, and the infrared detection sensor has excellent sensitivity.

The invention provides cast aluminum alloy high in thermal conductivity. The cast aluminum alloy is composed of, by weight, silicon of 4.0-6.5%, iron of 1.0-3.0%, copper of 0.4-1.0%, magnesium of 0.05-0.15%, manganese of 0.3-0.4%, nickel of 0.4-0.6%, tin of 0.1-0.2%, impurities of 0.05-0.2% and the balance aluminum. The cast aluminum alloy is good in castability and mechanical property, high in thermal conductivity and electrical conductivity and especially suitable for manufacturing automobile spare parts such as LED automobile lamp radiators and heating plates.

The present invention relates generally to a new process for hermetically sealing of a high thermally conductive substrate, such as, an aluminum nitride substrate, using a low thermally conductive interposer and structure thereof. More particularly, the invention encompasses a hermetic cap which is secured to an aluminum nitride substrate using the novel thermal interposer. The novel thermal interposer basically comprises of layers of relatively high thermal conductive metallic materials sandwiching a core layer of low thermal conductive metallic material.

The invention relates to a high-thermal-conductivity high-electrical-conductivity carbon nano-grade composite material. The material is characterized in that a polymer with a mass percentage of 3-30% is stuck and coated on the surface of carbon-based micro-nano powder with a mass percentage of 70-97%, and press molding is carried out, such that the material is obtained. According to the composite material, a layer of polymer is coated on the surface of high-thermal-conductivity high-electrical-conductivity carbon-based micro-nano powder with a water suspension method, such that the high-thermal-conductivity high-electrical-conductivity carbon nano-grade composite material powder is prepared. Preparation efficiency is high. When the method provided by the invention is used in preparing the high-thermal-conductivity high-electrical-conductivity carbon nano-grade composite material, the method is simple and feasible. The content of the carbon-based micro-nano powder filling material is high. The method can satisfy actual requirements of large-batch productions. The prepared high-thermal-conductivity carbon nano-grade material has good electrical conductivity and thermal conductivity, and can be applied in 3D printing materials, chemical equipment heat exchangers, laptops, high-power LED lightings, flat panel displays, digital cameras, mobile communication products, and fields of related miniaturized and high speed electronic components.

The present invention relates to dishwashers. The purpose of the utility model is to provide a tableware washing machine which is small in size, simple in structure and realizes water saving. The dish washing machine of the present invention has: a washing tank for storing tableware, a rotating nozzle body for spraying washing water into the washing tank, and a heater arranged on the bottom side of the washing tank and heating the washing water, and is characterized in that: A condensing mechanism is provided on the upper side of the tank. In addition, the condensing mechanism has a condensing plate with good thermal conductivity, and a cooling air supply mechanism that sends cooling air to the condensing plate. Also, the condensation plate has a cooling air duct through which cooling air flows.

The invention discloses a high-thermal-conductivity polyimide film prepared from a core-shell structure heat-conducting filler and a preparation method of the film. The heat-conducting filler is of acore-shell structure. The film comprises, by mass, 10-50 parts of the heat-conducting filler, 1-5 parts of a modifier and 80-500 parts of a polyamide acid solution. The heat-conducting filler is a boron nitride coated aluminum oxide core-shell heat-conducting filler. The core-shell heat-conducting filler is prepared by treating aluminum oxide by using the modifier and calcining boron nitride at high temperature through an electrostatic self-assembling method. The core-shell heat-conducting filler is added into the polyamide acid solution, stirred and uniformly mixed and subjected to standing to be defoamed in vacuum, the filler is laid to form a film, programmable heating is conducted for imidization, and the high-thermal-conductivity polyimide film is prepared. The film has the main characteristics of high heat conductivity coefficient and electric insulation, the processing cost is low, the preparation process is simple, the forming period is short, and the film has wide applicationprospects in the fields of electronics, aerospace and machinery.

The invention relates to a high-temperature resistant heat insulating material using vermiculite as a main raw material and a method for manufacturing the same, which belong to the field of heat insulating materials. The method is characterized by comprising the following steps: firstly, quickly heating and swelling commercially available primary minerals of the vermiculite with large, medium and small diameters at a temperature of between 500 and 900 DEG C; secondly, mixing the swelled vermiculite with an aluminum dihydrogen phosphate bonding agent, aluminum hydroxide or rho-alumina, and nano-silica according to the requirement of weight percentage; stirring the mixture evenly in an airtight stirring machine and then filling the mixture into a die; after prepressing, performing hot pressing and shaping on the mixture; and after discharging, finishing the product properly to obtain the high-temperature resistant heat insulating material using the vermiculite as the main raw material. Through grain composition, density control, addition of the nano-silica and application of the high-temperature resistant bonding agent, and using small grained primary minerals of the vermiculite with large yield and low cost, the high-temperature resistant heat insulating material and the method solve the bottleneck problems of insufficient supply of large grained primary minerals of the vermiculite, and the improvements on the strength and the service temperature of the vermiculite heat insulating material at the same time, thus the material can keep a low coefficient of thermal conductivity under a high temperature condition.

The invention provides a double-sided aluminum base circuit board with super-high thermal conductivity and a preparation method of the circuit board. The double-sided aluminum base circuit board comprises an aluminum base plate material, an electrical conductive hole formed on the aluminum base plate material for communicating the upper side and the lower side of the aluminum base plate material, an aluminum oxide layer formed on the upper and the lower sides of the aluminum base plate material and on the wall of the electrical conductive hole by oxidation method for insulation and heat conduction, and a DLC (diamond-like carbon) coating and a Cu coating adhered on the aluminum oxide layer. The double-sided aluminum base circuit board provided by the invention is excellent in comprehensive heat conducting property, and the surface insulation heat-conducting layer is free of high polymer materials and is excellent in flame retardant property and aging resistance. In addition, the insulation layer on the surface of the circuit board and the insulation layer on the wall surface of the electrical conductive hole are an integrated insulation heat-conducting body with the same composition and an integrated structure, thereby obviating the hole filling and the chemical copper deposition method, simplifying the process and improving the yield.

The invention relates to a tetragonal phase high-entropy thermal barrier coating material. The material is formed by ZrO2, Y2O3, M2O3, Ta2O5 and Nb2O5 oxide powder, the component of the material is Zr1-4xYxMxTaxNbxO2, x is more than 0 and less than 0.25, and M is a trivalent rare earth element. The invention also relates to a preparation method of the tetragonal-phase high-entropy thermal barrier coating material. The preparation method comprises the following steps: calcining to remove adsorbed water and impurities in each oxide powder; performing high-energy ball milling; separating, washing and drying balls to obtain mixed powder; and pressing into a ceramic blank by using a ceramic tablet press, and heating to obtain the high-entropy ceramic block material. According to the tetragonal-phase high-entropy thermal barrier coating material, excellent thermodynamic properties are provided through multi-component high entropy, including reduction of heat conductivity, increase of thermal expansion coefficient, enhancement of fracture toughness, good high-temperature stability, excellent CMAS corrosion resistance and the like, and the tetragonal-phase high-entropy thermal barrier coating material has the potential of serving at a higher gas temperature.

The invention discloses an equivalent thermal resistance and thermal conductivity coefficient detecting device for a thermal insulation coating for a building. The device comprises a heat source and an incubator, the incubator is internally provided with a partition plate, and the partition plate divides the incubator into two test chambers and heating chambers which are independent from each other; the heat source is communicated to the heating chambers for providing stable heat energy for the heating chambers, the test chambers are internally provided with mounting frames, the mounting frames have two or more layers of mounting brackets, the mounting brackets are provided with data acquisition temperature heat flow density devices, and the top of an incubator body of the incubator is divided into a paint plate to be tested and a comparative paint plate. The device can quantitatively design the equivalent thermal resistance of the blocking radiant heat for the thermal insulation coating for the building, and according to the equivalent thermal resistance, each use unit and each detecting mechanism can distinguish the authenticity and the advantages and disadvantages of the thermalinsulation coating. The global demand for such detecting device is generated as soon as possible, the application market prospect is very good, and the promotion value is excellent.

The present invention provides a thermally conductive grease composition which scarcely increases in hardness during high-temperature heating and has a minimized reduction in growth, containing:

• • (A) an organopolysiloxane including at least two alkenyl groups per molecule, the 25° C. kinetic viscosity being 5,000 to 100,000 mm²/s;
  • (B) a hydrolysable methyl polysiloxane, trifunctional at one terminus, represented by general formula (1)

(R¹ is a C_1-6 alkyl group, and a is an integer 5 to 100);

• • (C) a thermally conductive filler having a thermal conductivity of 10 W/m·° C. or greater;
  • (D) an organohydrogenpolysiloxane containing two to five hydrogen atoms directly bonded to a silicon atom (Si—H group) per molecule;
  • (E) an adhesion promoter having a triazine ring and at least one alkenyl group per molecule; and
  • (F) a catalyst selected from the group consisting of platinum and platinum compounds.

The invention relates to the field of porous materials, and particularly discloses a high-thermal-conductivity pure porous silicon carbide material, and a preparation method and application thereof. The porous silicon carbide material is constructed by a three-dimensionally connected pure silicon carbide network and a three-dimensionally connected pore network in an interfingering mode, wherein the silicon carbide network is composed of silicon carbide crystal grains connected through grain boundaries to ensure high thermal conductivity of the porous silicon carbide material. By adopting the structure design and preparation method of the high-thermal-conductivity pure porous silicon carbide material, the high-thermal-conductivity pure porous silicon carbide material with adjustable pore size and porosity height can be obtained. The pure porous silicon carbide material is a novel porous material with simple preparation technology and high efficiency, has a wide range of application prospects, and can be used in the following fields such as composite material reinforcements, heat dissipation materials, electromagnetic shielding materials, wave-absorbing materials, filters, biologicalmaterials, catalytic carrier materials, electrode materials, and sound absorbing/noise reducing materials.

The invention discloses a high-reflecting, heat-insulating and heat-preservation concrete gas-filled brick. The concrete gas-filled brick is characterized in that calcium carbide and sodium rosinate are used as composite air-entraining agents, a layer of a polyester coats the surface so that polyester-coated calcium carbide is obtained, hollow glass beads are subjected to cleaning oil removal, surface roughening and coupling to form surface-coupled glass beads, titanium dioxide and cerium oxide are deposited on the surfaces of the hollow glass beads through a hydrothermal method so that the modified hollow glass beads are obtained, the raw materials are mixed, the mixture is heated through steam to form a casting material, the casting material is poured into a mold, and the model is subjected to maintenance at the constant temperature and constant humidity, blank repair and steam maintenance at a high temperature so that the high-reflecting, heat-insulating and heat-preservation concrete gas-filled brick is obtained. A preparation method of the concrete gas-filled brick has simple processes and realizes a low cost. The concrete gas-filled brick has good strength, low thermal conductivity and good anti-cracking effects, saves energy, is environmentally friendly and satisfies the needs of the construction project and the requirements of environmental protection.

The invention relates to a preparation method of a large-sized and high-heat-conductivity natural graphite radiating film. The preparation method includes the steps: taking natural flake graphite as araw material and preparing highly oxidized graphite extremely easy to clean by an improved oxidized graphite preparation method; dispersing the oxidized graphite in a solvent to prepare slurry; coating a substrate with the slurry; drying an obtained wet film, and demolding and winding the film; performing carbonization or hydroiodic acid reduction treatment; performing graphitization treatment and calendaring to obtain the high-heat-conductivity natural graphite radiating film. By the method, the low-cost natural graphite film which is 3-20 micrometers in thickness, 50-200 millimeters in width and more than 2 meters in length can be prepared quite simply, the in-plane heat conductivity of the prepared graphite film can reach 1460Wm<-1>K<-1>, and the electrical conductivity of the preparedgraphite film can reach 5700Scm<-1>.

The invention discloses nano-titanium carbon composite material with ultra-high thermal conductivity, which is characterized in that: the invention has the components by weight percentage: 40 - 85 percent of acidized expansive graphite, 5 - 40 percent of flake graphite nano power, 5 - 30 percent of mesophase nano carbon power and 5 - 30 percent of metal titanium nano powder. The production process is that: the four components are weighted and mixed under temperature of 300 to 500 DEG C in a high-temperature reaction furnace for 2 - 5 hours so as to obtain concentrated mixture solution used for making carbon at high temperature; the concentrated mixture experiences molding, rolling or ejaculating under pressure of 120 - 300MPa and at temperature of 300 - 500 DEG C, so as to form; then the formed material is carbonized under temperature 900 - 1000 DEG C for 1 - 12 hours, and graphitized under temperature of 2500 to 3000 DEG C for 1 - 12 hours. The invention has simple technique and low production cost; the thermal conductivity of the invention can be lifted to above 700W/mK.

The invention discloses a device and method for measuring the contents of oxygen, nitrogen and part of organic gas in mixed gas. The method comprises the following steps: a mixed gas is introduced into a sample through a six-way valve; organic gas is detained through a Q column, residual oxygen and nitrogen are detected through a thermal conductivity cell (TCD) detector, a spectrogram is obtained,then the organic gas detained through the Q column is detected through a hydrogen flame (FID) detector, the spectrogram is obtained, and finally the peak areas of all components in the two spectrograms are measured through gas chromatography, so that the content of all the gases is obtained. The method disclosed by the invention is high in precision and accuracy, good in repeatability and simple,convenient and rapid to operate.

The invention relates to the technical field of electric spindles, in particular to a liquid metal temperature control system for an electric spindle. The liquid metal temperature control system for the electric spindle provided by the invention comprises a control system, an electric spindle housing and an electric spindle unit, wherein a closed coolant return pipe filled with liquid metal is arranged between the electric spindle housing and the electric spindle unit; the coolant return pipe is provided with an electromagnetic pump for pumping the liquid metal; and the electromagnetic pump isconnected with the control system. The liquid metal is adopted as a medium of a coolant, so that the thermal conductivity is good; the liquid metal which is not oxidized and of which the melting point temperature is close to the optimal working temperature of the electric spindle unit can be selected, the flow of the electromagnetic pump can be adjusted through the control system and the temperature of the coolant return pipe is effectively adjusted through changing the flow, so that the heat dissipation effect is further improved. In addition, the liquid metal temperature control system is compact in structure and reasonable in design; and a cooling and temperature control device does not need to be additionally arranged outside the electric spindle housing, so that the production cost is effectively reduced.

The invention discloses a back projection reflecting system fixing device, wherein the fixing device comprises a reflector fixing bracket and a projector fixing bracket cooperatively used with the reflector fixing bracket, the reflector fixing bracket comprises a first base, a telescopic device installed on the base, a reflector fixing device connected with the telescopic device and an adjustablereflector installed on the reflector fixing device, the back surface of the reflector is connected with a connecting device, and the connecting device is connected with the reflector fixing device through a movable hinge; and the projector fixing bracket comprises a second base and an adjusting device installed on the second base for adjusting the height and angle of the projector. The back projection reflecting system fixing device disclosed by the invention is lapped by aluminum alloy sections, so that the product outline is beautiful and is free from rust; the thermal conductivity of the aluminum alloy is higher than that of iron, so that the aluminum alloy sections are selected to facilitate the radiating the projector bracket; the installation is convenient, the production period is shortened and the mounting difficulty is reduced; and the suspension design can theoretically utilize the actual area of the reflector in a hundred percent.

The invention discloses a preparation method for a composite polymer film with high thermal conductivity. The preparation method comprises the following steps: firstly, mixing particles with high thermal conductivity or fibers with polymer particles, adopting an injection molding or compression molding process to obtain a first polymer film containing particles with high thermal conductivity or fibers, putting the first polymer film on a porous molding board, and putting the porous molding board into a vacuum heating tank to heat; after the first polymer film is molten, filling the porous molding board with the molten first polymer film to form a second polymer film; after certain time, taking out the porous molding board with the second polymer film from a vacuum heating tank, cooling the porous molding board with the second polymer film to the room temperature, and removing the porous molding board to obtain the second polymer film; and finally, sequentially rinsing the second polymer film by use of deionized water and absolute ethyl alcohol, and putting the second polymer film in a vacuum environment to dry to obtain the composite polymer film with high thermal conductivity. According to the preparation method, the heat-conducting property of the polymer film is improved by adding the articles with high thermal conductivity or fibers, and the heat-conducting performance of the polymer film is also improved by a porous molding board wetting technology; and the process is simple.

The invention discloses a millimeter wave traveling wave tube diamond energy transmission window and a processing method. The energy transmission window comprises an upper metal piece (1), a lower metal piece (2) and a diamond window sheet (3) which is welded between the upper metal piece (1) and the lower metal piece (2) through a gold-based solder. The diamond window sheet (3) is welded between the upper metal piece (1) and the lower metal piece (2) through a plane welding mode. A thickness of the diamond window sheet (3) is 0.2+/-0.01mm. By using the millimeter wave traveling wave tube diamond energy transmission window provided in the invention, the structure is designed reasonably; a thermal conductivity of the millimeter wave energy transmission window can be increased and high frequency losses are reduced; output power and a work bandwidth of a millimeter wave traveling wave tube are increased and an important application value is possessed. By using the processing method of the millimeter wave traveling wave tube diamond energy transmission window, a technology design is reasonable, operability is high and industrialized processing production is easy.