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465results about How to "High thermal conductivity" patented technology

Power generation system using exhausting and cooling waste heat in internal combustion engine at the same time and control method therefor

The invention discloses a power generation system using exhausting and cooling waste heat in an internal combustion engine at the same time and a control method therefor. The control method comprises the steps as follows: transferring waste heat in the cooling liquid of the internal combustion engine to an organic working medium by using a preheater in an organic Rankine cycle loop; transferring waste heat taken away by the exhaust gas of the internal combustion engine to the working medium of the organic Rankine cycle loop by using a heat-conducting oil loop; evaporating and gasifying the working medium; transforming enthalpy change in a high-enthalpy expansion process into useful work for outputting by using a single-screw expansion machine; driving a power generator to generate power; taking the tail gas temperature of an exhaust pipe outlet as feedback quantity for realizing the flow closed-loop control of the heat-conducting oil; taking the inlet working medium temperature of the single-screw expansion machine as feedback quantity for realizing the flow closed-loop control of the organic working medium; and taking the outlet working medium temperature of a condenser as feedback quantity for realizing the closed-loop control of the fan motor of the condenser. According to the invention, the flow quantities of the working mediums of the organic Rankine cycle loop and the heat-conducting oil loop are adjusted by using the segmented PI (Proportion Integration) control, so that the waste heat in the internal combustion engine is made the best of, the heat efficiency of the internal combustion engine is improved, and the hazard of the exhaust gas on the environment is reduced.
Owner:BEIJING UNIV OF TECH

Insulating heat-conducting metal-to-metal adhesive and manufacturing method thereof

The invention provides an insulating heat-conducting metal-to-metal adhesive and a manufacturing method thereof. The insulating heat-conducting metal-to-metal adhesive is mainly composed of a micro-droplet-shaped mixture and an insulating substrate material, wherein the micro-droplet-shaped mixture is uniformly distributed in the insulating substrate material and is completely coated by the external insulating substrate material. The manufacturing method for the insulating heat-conducting metal-to-metal adhesive comprises the following steps: subjecting a selected low-melting-point metal or alloy to heating, stirring and oxidation so as to prepare a liquid mixture heat-conducting filling material; and fully mixing the liquid mixture heat-conducting filling material with the insulating substrate material with stirring so as to form the insulating heat-conducting metal-to-metal adhesive. The invention has the following beneficial effects: the insulating heat-conducting metal-to-metal adhesive inherits high heat conductivity and phase change endothermicity of liquid metal; the micro-droplet-shaped mixture is completely coated by the insulating substrate material with insulating properties, so insulating properties of the insulating heat-conducting metal-to-metal adhesive are guaranteed; and the adhesive can better meet demands of novel electronic products for both space compaction and electrically isolated electronic cooling.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Aluminium nitride ceramic substrate, and preparation method thereof

The invention discloses an aluminium nitride ceramic substrate, and a preparation method thereof. The aluminium nitride ceramic substrate is prepared from an aluminium nitride ceramic tape casting slurry. The aluminium nitride ceramic tape casting slurry comprises aluminium nitride powder, a sintering air, a dispersant, a solvent, a plasticizer, a binder, and a defoaming agent. The preparation method comprises following steps: 1, primary ball milling is carried out; 2, secondary ball milling is carried out; 3, vacuum defoaming is carried out; 4, an obtained mixed slurry obtained via step 3 is subjected to tape casting, is subjected to heating on a film band, is cooled naturally, and is peeled off from the film band so as to obtain aluminium nitride tape casting sheets; 5, the aluminium nitride tape casting sheets are overlapped so as to obtain an aluminium nitride green body; 6, additive removing is carried out so as to obtain an aluminium nitride blank; and 7, sintering is carried out so as to obtain aluminium nitride ceramic. According to the preparation method, aluminium nitride is obtained via tape casting of a benzene-free, ketone-free, nontoxic organic solvent, and the sintering aid is added, so that the aluminium nitride ceramic substrate can be obtained via sintering at a relatively low temperature.
Owner:RENMIN UNIVERSITY OF CHINA

Particle dispersion toughening aluminum nitride ceramic substrate and preparation method thereof

The invention discloses a particle dispersion toughening aluminum nitride ceramic substrate for the illumination packaging of a high-power LED (Light-Emitting Diode) and a preparation method thereof. The particle dispersion toughening aluminum nitride ceramic substrate comprises the following components in percentage by weight: 80%-95% of AIN (Aluminum Nitride) powder, 2%-8% of sintering auxiliary agents and 3%-12% of toughening phases, wherein the sintering auxiliary agents are one or mixtures of any combination of a rare-earth metal oxide, a weak base oxide and a rare-earth fluoride or a weak base fluoride; the toughening phases are one or mixtures of any combination of molybdenum, tungsten, niobium, molybdenum carbide, tungsten carbide and niobium carbide. According to the invention, the fracture toughness of The AIN substrate disclosed by the invention is effectively enhanced in fracture toughness through crack deflexion and bending, crack bridging and a residual stress toughening mechanism, can meet the requirements for high heat conductivity and excellent electric property due to good chemical compatibility of the added toughening phases and the aluminum nitride base body, enhances the comprehensive property of aluminum nitride and has excellent mechanical property, heat-conducting property and electrical property.
Owner:GUANGDONG UNIV OF TECH

Preparation method of high-thermal-conductivity graphite whisker-oriented and reinforced metal-based composite material

ActiveCN103911565AHigh degree of directional distributionHigh thermal conductivitySolventThermal conductivity
The invention belongs to the technical field of electronic encapsulating composite materials, and relates to a preparation method of a composite material of high-thermal-conductivity graphite whisker-oriented and reinforced metal. The composite material contains high-thermal-conductivity graphite whiskers of which the volume fraction is 20-80 percent. The preparation method of the composite material comprises the following production process steps: uniformly mixing metal powder, whiskers and paste comprising a bonding agent, a plasticizer and a solvent; pouring the mixture into a one-way extruding mold and extruding in an oriented manner to obtain strip-shaped or laminar sintered precursors; and removing the paste from the sintered precursors, putting the sintered precursors into a mold in an overlaying manner, sintering and curing to obtain the composite material. The one-dimensional oriented distribution degree of the whiskers in the composite material produced by adopting the method is high, and axial thermal conduction of the whiskers is facilitated. The obtained composite material has relatively high thermal conductivity and an adjustable thermal expansion coefficient, and is an ideal electronic encapsulating material.
Owner:UNIV OF SCI & TECH BEIJING

Polyphenylene sulfide-based heat conducting composite material and preparation method thereof

ActiveCN103725004AHigh thermal conductivityAffect tensile strengthPolyamideFlexural strength
The invention relates to a polyphenylene sulfide-based heat conducting composite material and a preparation method thereof, belongs to the field of high polymer materials and provides the polyphenylene sulfide-based heat conducting composite material. The composite material comprises polyphenylene sulfide, polyamide, a heat conducting filler M and a heat conducting filler N, wherein the polyphenylene sulfide and the polyamide form a dual continuous phase structure; the heat conducting filler M is distributed in the polyphenylene sulfide phase; the heat conducting filler N is distributed in the polyamide phase; two independent heat conducting nets are formed. The composite material comprises the following materials in parts by weight: 20-30 parts of the polyphenylene sulfide, 15-30 parts of the polyamide, and 10-50 parts of the heat conducting filler M and the heat conducting filler N; the heat conducting filler M is different from the heat conducting filler N. According to the invention, the heat conducting property of the polyphenylene sulfide-based heat conducting composite material is improved greatly; the heat conducting coefficient of the polyphenylene sulfide-based heat conducting composite material can reach to 8.14 W/(m. K) maximally; the tensile strength and the bending strength are hardly affected by the heat conducting fillers.
Owner:SICHUAN UNIV

Method for preparing highly heat-conductive copper-clad plate

The invention relates to a method for preparing a highly heat-conductive copper-clad plate, which is realized by the following steps of: preparing gluewater; preparing a gluewater solution with the solid content of 60-90% by using a mixture of polyfunctional epoxy resin and polyurethane; taking an inorganic filler which adopts a mixture of aluminium nitride and aluminium oxide as the main contents, wherein aluminium nitride content accounts for 40-60 wt% of the total weight of the mixture, and aluminium oxide content accounts for 40-60 wt% of the total weight of the mixture; using the inorganic filler after being fully and uniformly mixed as the filler of the gluewater solution; using dicyandiamide as a curing agent, imidazole as an accelerating agent and acetone as a solvent to prepare the gluewater solution with the solid content of 60-80% and the gel time of 150-450 seconds for application; putting the gluewater solution into a glue mixer and then conveying the gluewater solution to a heating medium oil vertical gluing machine; and preparing a single-surface or double-surface copper-clad plate. The prepared copper-clad plate has high heat conductivity, capability of holding a higher installation density and excellent dimension stability, and can be used for preparing printed circuit boards with finer wiring and more layers.
Owner:SHANGHAI GUOJI ELECTRONICS MATERIALS CO LTD

Apparatus for pyrolyzing solid wastes through molten salt, and method thereof

ActiveCN104399732AImprove heat storage capacityHigh thermal conductivitySolid waste disposalDecompositionPyrolysis
The invention belongs to the technical field of solid waste treatment and resource recovery, and relates to an apparatus for pyrolyzing solid wastes through molten salt, and a method thereof. The method uses the molten salt as a pyrolysis medium, the solid wastes are immersed in the molten salt and are effectively dissociated and decomposed under preset pyrolysis conditions, and various resource substances can be recovered. Pyrolysis products of organic components in the solid wastes are recycled as energy and resource substances. The method has the advantages of short process flow and simple operation. The apparatus allows the above raw material to be sent into or moved out of a molten salt reactor through a pyrolysis basket, and comprises a gas inlet, a gas outlet, and a feeding and discharging gate. The method uses the high heat accumulation capability and high heat conduction rate of the molten salt, effectively improves the decomposition rate of organic matters and the energy utilization rate, traps or converts acidic gases and harmful substances by using the characteristic of reaction of the molten salt with the acidic gases and the harmful substances, reduces secondary pollution to environment, and improves the cleanliness and resource of products.
Owner:DALIAN UNIV OF TECH

Silicon nitride-modified phase-change and energy-storage microcapsule and preparation method thereof

The invention discloses a silicon nitride-modified phase-change and energy-storage microcapsule, comprising a shell material and a cladded core material, wherein the shell material comprises the following raw materials in parts by weight: 50-100 parts of high-molecular polymers and 1-20 parts of silicon nitride powder which is evenly dispersed into the high-molecular polymers; the core material comprises 50-100 parts of organic phase-change and energy-storage materials and 1-20 parts of silicon nitride powder which is evenly dispersed into the organic phase-change and energy-storage materials. The invention also provides a preparation method of the phase-change energy-storage microcapsule. The thermal conductivity of the phase-change and energy-storage material is improved, overheat and overcold degrees in the phase-change process are inhibited, and meanwhile, the thermal endurance and the abrasive resistance, the thermal shock resistance, the fatigue resistance and the like also are improved. The silicon nitride-modified phase-change and energy-storage microcapsule is relatively simple in preparation technology, available in raw materials, strong in controllability, and applicable to the industrial large-scale production, an existing industrial processing technology can be fully utilized, and the performance of the phase-change and energy-storage microcapsule is improved.
Owner:SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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