36results about How to "Control thermal conductivity" patented technology

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 a preparation method of a lightweight anorthite based thermal insulation material. The preparation method of the thermal insulation material comprises the steps of material mixing, foaming, blending, grouting, demoulding, drying and sintering. The porosity of the obtained thermal insulation material is 85-95%, the volume density is 150-380 kg/m3, the thermal conduction coefficient is 0.04-0.06 W/(m.K), and the compressive strength is 0.48-0.97 MPa, or the compressive strength is 0.53-1.13 MPa. The thermal insulation material prepared according to the invention takes anorthite as a main crystalline phase, so that the thermal insulation material has low thermal conductivity, low specific gravity, good thermal stability, creep resistance and erosion resistance. The preparation method disclosed by the invention is simple and easy to operate, low in cost, energy-saving and environmental friendly, and suitable for industrialized production; adopted raw materials are industrial wastes such as fly ash, gypsum, waste glass, and therefore, the preparation method has extremely high economic and social significances.

The invention discloses a continuous fiber reinforced high-entropy ceramic matrix composite material and a preparation method thereof, and belongs to the technical field of composite material forming. The preparation method of the high-entropy ceramic-based composite material comprises the following steps: carrying out primary impregnation on a carbon fiber material in a boric acid/urea mixed solution, then carrying out heat treatment to obtain a carbon fiber material with a coating, coating the carbon fiber material with the coating with composite slurry, pressurizing, drying to obtain a high-entropy ceramic-based composite material green body, and carrying out secondary impregnation and cracking on the green body in the precursor solution to obtain the high-entropy ceramic-based composite material. According to the forming method, low-temperature and low-cost preparation of the high-entropy ceramic-based composite material is achieved.

The invention provides a preparation method of graphite foam. The method comprises the following steps that graphite nanosheets are used as raw materials; a small number of macromolecular bonding agents are added; through template forming, the graphite foam is formed after the drying. The preparation method provided by the invention is simple and convenient, and can be used for forming graphite foam in various shapes; in addition, the prepared graphite foam has the controllable density and uniform pores. The prepared graphite foam also has the advantages of high pressure-resistant intensity, low resistance, oil absorbability, high heat conductivity and the like, can be widely applied to the fields of heat radiators, heat conduction pads, electromagnetic shielding materials and the like, and has wide application prospects.

A preparation method of polystyrene ultrafine powder by use of acryloyl chloride-phenethylene copolymer azide modified carbon nano tube as an antistatic agent belongs to the field of heat-conducting antistatic modified engineering plastics. The preparation method comprises the following steps: preparing an acryloyl chloride-phenethylene copolymer at first; then preparing an acryloyl chloride-phenethylene copolymer azide through reaction between the acyl chloride bond and sodium azide; after that, preparing a polystyrene-encapsulated modified carbon nano tube through reaction between the azide group and a carbon nano tube; finally, enabling the polystyrene-encapsulated modified carbon nano tube to participate in suspension polymerization of phenethylene to synthesize the heat-conducting antistatic polystyrene ultrafine powder. The surface of the modified carbon nano tube contains polystyrene, so that the dispersity of the carbon nano tube in a styrene monomer is enhanced. The prepared polystyrene ultrafine powder has heat-conducting and antistatic property and can be used for preparing heat-conducting antistatic 3D printing products.

The invention belongs to the technical field of polymer materials, and discloses a thermally-conductive polybutylene succinate ionomer and a preparation method and application thereof. The preparationmethod comprises the following steps that under an inert atmosphere, succinic acid and butanediol are mixed, stirred and heated for a reaction, a catalyst is added, during vacuuming, the temperatureis increased to 200-220 DEG C for a reaction of 0.5-2.5 hours, and a polybutylene succinate prepolymer is obtained; then the temperature is decreased to 135-155 DEG C, an ionic monomer is added, and vacuuming is conducted for a reaction of 1.5-3.5 hours; finally, nitrogen is introduced, a chain extender is added for a reaction, and after the reaction is completed, cooling is conducted to room temperature to obtain the thermally-conductive polybutylene succinate ionomer. The thermally-conductive polybutylene succinate ionomer is subjected to hot pressing treatment to prepare a sheet-shaped sample strip, then stretching treatment is conducted, and the anisotropic thermally-conductive polybutylene succinate ionomer is prepared.

The invention relates to a preparation method of a lightweight cordierite-based thermal insulation material. The thermal insulation material is prepared by sintering the following materials in parts by weight: 43 to 64 parts of kaolin, 11 to 34 parts of attapulgite, and 22 to 29 parts of basic magnesium carbonate, or 50 to 73 parts of kaolin, 14 to 39 parts of attapulgite and 10 to 21 parts of magnesium oxide. The preparation method comprises the following steps: mixing the materials; foaming; grouting; demoulding and drying; sintering. The porosity of the obtained lightweight cordierite-based thermal insulation material ranges from 83% to 90%; the volume density of the thermal insulation material ranges from 270kg/m<3> to 400kg/m<3>; the thermal conductivity coefficient of the thermal insulation material ranges from 0.07W/(m.K) to 0.09W/(m.K); the compressive strength of the thermal insulation material ranges from 0.53MPa to 1.13MPa. The prepared thermal insulation material taking cordierite as a principal crystalline phase is low in thermal conductivity, low in specific gravity, low in thermal expansion coefficient, good in thermal stability and resistant to creep deformation and erosion. The preparation process is simple, easy to operate and low in cost, is energy-saving and environment-friendly, and is suitable for industrial production.

The invention discloses a router upper and lower cover injection mold and an injection molding process thereof, and belongs to the technical field of injection molding. By means of the router upper and lower cover injection mold, prepared pore-forming balls can be injected into a raw material through temperature control columns in a micro-curing state of the raw material in the manner of positioning and mounting the plurality of temperature control columns in the mold, filling in the raw material is carried out to form a similar interlayer, temperature control balls are then controlled to be distributed on the surface of the raw material through the magnetic attraction effect, finally, the pore-forming balls are sucked out to form a cavity in the raw material to serve as a heat preservation interlayer, the temperature control balls are at the surface to serve as a heat conduction layer, and heat conduction variable bags in the temperature control columns make contact with a composite heat conduction plate in the high-temperature state, so that working heat of electron components in a router shell can be quickly dissipated, in a low-temperature state, temperature sensing control rods in the heat conduction variable bags contract when meeting cold, the heat conduction variable bags are separated from the composite heat conduction plate, external cold is difficult to enter the shell, heat preservation is carried out by virtue of heat generated by the temperature sensing control rods, and the working thermal stability of a router is improved.

The invention provides an improved automobile friction material. The improved automobile friction material is prepared from the following raw materials in parts by weight: 3-5 parts of polypropylene ester, 2-4 parts of a dispersant, 6-9 parts of modified polypropylene, 4-6 parts of hydroquinone, 5-8 parts of a friction performance conditioning agent, 9-18 parts of mica powder, 6-10 parts of graphite powder, 4-9 parts of high-strength carbon fibers, 11-16 parts of hollow glass micro-beads, 2-6 parts of glass fibers, 5-10 parts of an anti-rusting agent and 3-6 parts of polyamide. The improved automobile friction material provided by the invention has the beneficial effects that the thermal dilatation coefficient, the thermal conductivity and the shrinking percentage of a product can be effectively controlled, the stability of the product size is increased, the friction performance is good and the production cost is low.

The invention provides a novel light energy storage constant-temperature pot which comprises a pot body and a pot bottom and further comprises a foam metal heat preservation layer and an inorganic ceramic heat insulation layer, the foam metal heat preservation layer is fixedly installed between the pot body and the pot bottom, and the inorganic ceramic heat insulation layer is laid on the inner surface and/or the outer surface of the pot body and/or the pot bottom. The heat preservation and heat insulation performance of the pot body can be achieved, the overall weight of the constant-temperature pot can be reduced, the constant-temperature pot can be used on heat sources such as an induction cooker, a gas open fire and a hot ceramic stove, user operation is facilitated, the temperature in the pot is kept within a certain range in the cooking and heating process, the taste and delicious taste of fresh food are reserved, and the safety of nutritional ingredients of the food is also guaranteed.

The invention relates to a graphite-silicone rubber composite material and a preparation method thereof. The preparation method comprises the following steps: selecting graphite paper as a matrix; placing the substrate in alkaline oil removal water at 55-75 DEG C for ultrasonic oscillation, and using distilled water for cleaning after ultrasonic oscillation is completed; preparing a KH-550 solution with the mass fraction concentration of 5-20% by using absolute ethyl alcohol or acetone as a solvent; putting the cleaned graphite paper into a prepared KH-550 solution to be soaked, and then taking the graphite paper out and drying; placing a layer of spread graphite paper; spraying a layer of methyl vinyl silicone rubber with uniform thickness on the upper surface of the graphite paper by using a spraying machine; placing a layer of spread graphite paper on the upper surface of the methyl vinyl silicone rubber; repeating the steps; applying continuous constant pressure, and completely curing the material after preset time; and shearing along a direction perpendicular to the spreading direction of the graphite paper to obtain the formed graphite-silicone rubber composite material. According to the method, the graphite-silicone rubber composite material with uniform thickness and high bonding strength can be obtained.