39results about How to "Small thermal conductivity" patented technology

The main object of the present invention is to provide thermoelectric conversion materials having a high thermoelectric conversion performance and excellent mass productivity. The thermoelectric conversion materials have a core-shell structure with a plurality of core parts and shell parts for covering the core parts. The plurality of core parts are independent of each other and the shell parts are provided continuously such that the shell part of one core part is continuous with the shell part of a different core part.

The present invention provides a method and pavement structure for protecting highway subgrade in frozen soil areas. The pavement structure has two or more pavement layers having gradient thermal conductivity; the thermal conductivity is layered among the pavement layers and is lowered from top to bottom, so that the pavement forms a uni-directional thermal conducting tunnel from the subgrade to the air. Heat can be easily released from the subgrade into the air, and is prevented from being transferred from the air to the subgrade. In this way, the frozen soil layer beneath the subgrade is cooled, so that the frozen soil table is made stable, and the highway subgrade in frozen soil areas is protected.

A heat-insulating material is provided in which thermal conductivity is controlled not to increase and good insulation properties are held even in a high temperature range. The heat-insulating material is formed of a spinel porous sintered body having a porosity of 65 to 90 vol. % and represented by a chemical formula XAl2O4 (X=Zn, Fe, Mg, Ni, or Mn) which is arranged such that large pores having a diameter of greater than 1000 μm occupy 25 vol. % or less of the total pore volume, fine pores having a diameter of 0.45 μm or less occupy 5 to 40 vol. % of the volume of the pores having a diameter of 1000 μm or less, at least one pore-diameter distribution peak is within a range of 0.14 to 10 μm, and is formed of sintered particles having a calculated average particle diameter of 0.04 to 1 μm.

The invention discloses a production method of a sintered-filled self-insulation building block or wallboard. The production method comprises the following steps: adding cement and water into crushed construction waste or coal ash, uniformly mixing, then adding cellulose and a foaming agent, with the added amount of cellulose being 0.5-3% of the total mass and the added amount of the foaming agent being 1-5% the total mass, and uniformly mixing to obtain an insulation filling material; filling up the cavity of the building block or the wallboard with the insulation filling material, and naturally curing or curing by heating, thus obtaining the filled self-insulation building block or wallboard. According to the production method disclosed by the invention, the construction waste is used for resource utilization, thus turning waste into wealth; a wall body has an excellent insulation performance, is a real green and energy-saving building block, plays good energy-saving and emission-reducing roles, and meets the need of building energy conservation; the thickness of the wall body is reduced, sand rubbing does not need to be carried out at the outer side and the inner side of the wall body, the glaze surface of the wall body is directly used as an outer wall surface, and an inner cavity coating is directly brushed on the inner side surface of the wall body, thus furthest reducing working procedures and saving various building materials.

A heat dissipating device includes a heat dissipating fin module, a second base, a third base, a heat pipe, a first sleeve and a fourth base. The heat dissipating fin module includes a first base and a plurality of first heat dissipating fins. A recess is formed on the second base. The third base is disposed in the recess. The heat pipe includes a heat dissipating segment, a heat absorbing segment and a connecting segment connecting the heat dissipating segment and the heat absorbing segment. The heat dissipating segment is disposed in the first base. The heat absorbing segment is disposed in the second and third bases and contacts the third base directly. The first sleeve at least covers the connecting segment. The fourth base is formed by a die casting process and covers peripheries of the first and second bases and the first sleeve.

The invention relates to an organosilicon micro-emulsion mould release agent which consists of the following compositions in weight percentage: 20 to 35 percent of dimethyl cyclic siloxane, 3 to 7 percent of alkyl triethoxy silane, 2 to 6 percent of fatty alcohol-polyoxyethylene ether, 0.1 to 0.5 percent of ethylenediamine tetracetic acid, 4 to 8 percent of dodecyl benzene sulfonic acid and 50 to70 percent of deionized water; the sum of the compositions is 100 percent; and the PH value is neutral. The organosilicon micro-emulsion mould release agent overcomes the disadvantages that the priorgaseous mould release agent is inflammable and explosive, pollutes environment and the like. The organosilicon micro-emulsion mould release agent has the advantages of convenient use, good mould release effect, low cost and the like. The organosilicon micro-emulsion mould release agent also releases a method for preparing the organosilicon micro-emulsion mould release agent.

In prior art hook commutators, the brazed connection (15) used to connect the carbon segments (13) to the segments (11) would become disengaged because during the thermal bonding used to secure the winding wires generate heat. The hook commutator (1) according to the invention has a low thermal conductivity between the commutator hook (19) and the carbon segment (13), thereby protecting the soldered connection (15) from overheating.