67results about How to "High critical temperature" patented technology

The present invention relates to an optical article having anti-reflection properties and high thermal resistance, comprising a substrate having at least one main face coated with a multi-layer anti-reflection coating comprising a stack of at least one high refractive index layer and at least one low refractive index layer, wherein the ratio:

is higher than 2.1. If the anti-reflection stack comprises at least one low refractive index layer having a physical thickness ≧100 nm which is not the outermost layer of the anti-reflection coating, said relatively thick layer and the underlying layers are not taken into account in R_T calculation.

The invention discloses a large-size corrosion-resistant neodymium-ferrum-boron (Nd-Fe-B) permanent magnetic material and a preparation method thereof. The permanent magnetic material is characterized by the following metal elements (by weight percentage): Nd: x1%, Dy: x2%, Tb: x3%, Pr: x4%, Fe: y1%, Co: y2%, B: 0.9-1.1%, Cu: z1%, Al: z2%, and Ga: z3%; wherein x2 is higher than or equal to 0 and lower than or equal to 10, x3 is higher than or equal to 0 and lower than or equal to 5, x4 is higher than or equal to 0 and lower than or equal to 5, the sum of x1, x2, x3 and x4 is higher than or equal to 29 and lower than or equal to 33, y2 is higher than or equal to 0 and lower than or equal to 10, the sum of y1 and y2 is higher than or equal to 65 and lower than or equal to 69, z1 is higher than or equal to 0 and lower than or equal to 0.5, z2 is higher than or equal to 0 and lower than or equal to 1, and z3 is higher than or equal to 0 and lower than or equal to 1. The preparation method comprises the following steps: mixing the above elements and making into thin sheet alloy by using the rapid strip casing process, breaking, pulverizing to powder, press-forming under a parallel magnetic field and a vertical magnetic field, isostatic-pressing, and sintering to obtain the large-size corrosion-resistant Nd-Fe-B permanent magnetic material.

A method and apparatus for using a secondary refrigerant to precool and liquefy a primary refrigerant, then vaporizing and expanding the primary refrigerant to cool a cold tip of a cryosurgical instrument for ablation of biological tissue, such as cardiovascular tissue, in particular endocardiac tissue and tissue inside a cardiac blood vessel. The secondary refrigerant has a critical temperature above the critical temperature of the primary refrigerant, and a cooling temperature below the critical temperature of the primary refrigerant, thereby facilitating the use of the precooling step to provide liquid primary refrigerant in an operating room environment in which the primary refrigerant could not otherwise be provided in the liquid phase.

The invention relates to a method of extracting bay leaf oil from bay leaves with subcritical n-butane fluid. The method includes smashing, adding into a tank, dipping with an n-butane solvent, extracting, distilling, and the like. Extraction temperature and pressure can be accurately controlled by utilization of a subcritical extraction device. The method is high in extraction efficiency, low in device manufacturing cost, high in raw material treating amount, simple in process, low in production cost and free of solvent residue. A whole process of the method is performed at low temperature under an oxygen-free state. Extraction and separation are performed at the same time. The extraction speed is high. Recovery and reutilization of the solvent can be achieved.

A superconductive element containing Nb₃Sn, in particular a multifilament wire, comprising at least one superconductive filament (8) which is obtained by a solid state diffusion reaction from a preliminary filament structure (1), said preliminary filament structure (1) containing an elongated hollow pipe (2) having an inner surface (3) and an outer surface (4), wherein said hollow pipe (2) consists of Nb or an Nb alloy, in particular NbTa, wherein the outer surface (4) is in close contact with a surrounding bronze matrix (5) containing Cu and Sn, and wherein the inner surface (3) is in close contact with an inner bronze matrix (5) also containing Cu and Sn, is characterized in that the inner bronze matrix (5) of the preliminary filament structure (1) encloses in its central region an elongated core (6) consisting of a metallic material, said metallic material having at room temperature (=RT) a thermal expansion coefficient α_core<17*10⁻⁶K⁻¹, preferably α_core≦8*10⁻⁶ K⁻¹, said metallic material having at RT a yield strength R_p0.2>300 MPa, said metallic material having at RT an elongation at rupture A>20%, and wherein the metallic material of the core (6) is chemically inert with respect to the material of the inner bronze matrix (5) up to a reaction temperature T of the solid state diffusion reaction. This element has improved superconductive properties in a large volume fraction of its superconductive filaments, in particular a high critical temperature T_c and a high critical magnetic filed strength B_c2, and is mechanically stable enough for commercial applications such as magnet coils.

A household appliance includes a drying chamber, a process air loop and a heat pump. The heat pump includes a heat transfer loop containing a heat transfer fluid, an evaporator heat exchanger, a liquefier heat exchanger, a compressor, and a nozzle. The heat transfer fluid has a critical temperature above 60° C., a nominal heat of vaporization at boiling point of at least 220 kJ/kg, a GWP index of less than 150 and a lower flammability level of at least 0.1 kg/m³. Preferably, the household appliance is a dryer for drying wet laundry.

The invention discloses a high-temperature resistant pump comprising a pump body, an impeller, a shaft sleeve, a pump shaft and a pump cover, wherein the pump body is U shaped and is installed on the shaft sleeve; the shaft sleeve and the impeller are arranged on the pump shaft; the impeller is positioned in the groove of the pump body; the pump cover is connected to the front end of the pump body; the pump shaft is connected with the main shaft of a motor; a shaft cooling sleeve and a fan are arranged between the pump body and the motor in sequence; the shaft cooling sleeve is connected with the pump body; the middle part of the shaft cooling sleeve is fully cylindrical, and round cooling fins are evenly distributed at the periphery of the shaft cooling sleeve; a shell is arranged outside the shaft cooling sleeve; two ends of the shell are respectively connected with the motor and the pump body; and a mechanical sealing element is arranged between the shaft cooling sleeve and the fan and on the shaft cooling sleeve. The high temperature-resistant pump has simple structure, low cost and long service life and is simple to manufacture and maintain.

A working medium for a heat cycle includes HFO-1123, HFC-32, and HFO-1234ze. These three components HFO-1123, HFC-32, and HFO-1234ze are present as principal components in a mixture state.

The invention provides a graphene / doped two-dimensional layered material Van der Waals heterojunction superconducting composite structure, a superconducting device and a manufacturing method thereofand relates to the superconducting material technology field. A graphene layer and a layered structure of 2n + 1 layers formed by alternative doped two-dimensional layered materials are included. Anouter layer of the layered structure is the graphene layer, and the n is an integer of 1 to 50. A region where graphene and the doped two-dimensional layered material are completely overlapped vertically forms a superconducting region. The graphene layer and the doped two-dimensional layered material are self-assembled into one body by a Van der Waals force. A defect that an existing Van der Waalsheterojunction superconducting material can only work at an extremely low temperature is solved. The graphene / doped two-dimensional layered material heterojunction superconducting material has a simple structure, excellent performance, a high critical temperature and a high critical magnetic field, low material cost, and good mechanical and machining performance.

The present invention provides a beryllium-containing ceramic precursor preparation method, which comprises: dissolving polycarbosilane and beryllium 2,4-pentanedionate in a solvent, uniformly mixing, and distilling to remove the solvent to obtain a mixture; and under a protection atmosphere, heating the mixture, and carrying out a coupling reaction to obtain the beryllium-containing ceramic precursor. According to the present invention, the prepared beryllium-containing ceramic precursor has characteristics of high thermal decomposition stability, simple preparation method and low cost, and meets the industrial production requirements.

An air conditioner of indirect solar energy is composed of light pipe receiver , energy accumulator , exchanger , four - way solenoid valve , condenser , evaporator , booster , pressure release gate valve , pressure release and charging valve , fan , relay control panel and transfusion pipe . It features connecting light pipe receiver to energy accumulator in parallel for forming energy receiver outdoor, setting exchanger connected respectively with condenser and four - way solenoid valve at top and bottom in energy accumulator and connecting evaporator to condenser and four - way solenoid valve separately through transfusion pipe.

The invention discloses anti-oxidation and anti-thermal fatigue hot working die steel which is characterized by including, by mass percent, 0.02 to 0.15 of carbon, 0 to 1.2 of silicon, 0 to 0.6 of manganese, 0 to 0.030 of phosphorus, 0 to 0.015 of sulfur, 8.0 to 12.0 of chromium, 0.2 to 0.6 of molybdenum, 1.5 to 2.3 of tungsten, 0.8 to 1.2 of vanadium, 0.01 to 0.1 of nitrogen, 0.05 to 0.20 of niobium, 1.0 to 4.0 of cobalt, 0.005 to 0.015 of boron, and the balance iron and inevitable impurities. The manufacturing method includes subjecting raw material compositions forming elements to smelting and casting to obtain die steel ingots; forging or rolling the die steel ingots; annealing the forged or rolled die steel ingots; and subjecting the annealed die steel ingots to final thermal treatment. The manufacturing method is characterized in that the annealing process includes that air cooling is kept at a temperature of 800 DEG C to 850 DEG C for 1-2h; and the final thermal treatment process includes that oil cooling is kept at a temperature of 1030 DEG C to 1150 DEG C for 0.5-2h, and air cooling is kept at a temperature of 600 DEG C to 700 DEG C for 1-2h. Compared with the prior art, the anti-oxidation and anti-thermal fatigue hot working die steel and the manufacturing method thereof have the advantages that the hot working die steel manufactured at a temperature above 600 DEG C has a high high-temperature strength and a stagnation temperature compared with the existing hot working die steel such H13 steel and 3Cr2W8V steel, accordingly, high anti-oxidation and anti-thermal fatigue performances are provided, and anticorrosion and anti-oxidation performances are improved greatly compared with the existing hot working die steel because many chromium elements are contained.

The invention relates to the technical field of bonding resins, and concretely relates to a preparation method of a low-VOC bonding resin. The preparation method comprises the following steps: preparing a primary bonding resin from a matrix resin, a graft monomer, an initiator, a tackifying resin and a functional assistant through a double screw extruder, feeding the primary bonding resin into a supercritical device, and removing VOCs from the primary bonding resin by a purifying solvent to obtain the low-VOC bonding resin, wherein the purifying solvent is one or more of carbon dioxide, 1,1,1,2-tetrachloroethane, methane, ethane, propane, ethylene and propylene. The supercritical fluid purification of the primary bonding resin in the method greatly reduces the content of the VOCs in orderto effectively improve the use performance and the safety performance of an automobile plastic fuel tank; and the preparation method has the advantages of environmentally-friendly and efficient preparation process, and simple process route, and the tackifying resin and the functional assistant can improve the flowability, the adhesion and the aging resistance of the bonding resin.

The invention discloses a battery fire extinguisher achieving fire extinguishment with hexafluoropropane and carbon dioxide. The battery fire extinguisher comprises a fire extinguishment bottle installed outside a battery box, wherein a vehicle-mounted battery is fixedly arranged in the battery box, a spray pipe of the fire extinguishment bottle is arranged in the battery box, the fire extinguishment bottle is filled with fire extinguishment materials which are intermixtures formed by the hexafluoropropane and the carbon dioxide, both the hexafluoropropane and the carbon dioxide are of a liquid state, the hexafluoropropane accounts for 15%-18% of the intermixtures (by volume), and the balance is the carbon dioxide. The battery fire extinguisher has the advantages of being capable of conducting physical fire extinguishment and chemical fire extinguishment simultaneously.

The invention discloses high temperature superconducting material and a method for preparing the high temperature superconducting material. The high temperature superconducting material is composed of yttrium, aluminum, nickel, lithium, zinc, barium and boron of which the molar ratio is 1:6-9:1-3:2-6:3-6:1.5:1-2. The preparation method comprises the steps that 1) a nitrate mixed solution is prepared; 2) citric acid is added in the nitrate mixed solution; 3) heating concentration is performed on the mixed solution obtained in the step 2) until gel is completely combusted so that powder material is formed; 4) powder is evenly ground; and 5) the ground powder is put in a high temperature furnace for calcining and then taken out after cooling to room temperature so that superconducting material is obtained. A sol-gel method and a high temperature calcining method are adopted for preparation so that the homogeneous superconducting material is formed, the defect of low critical temperature of the existing superconducting material can be solved, the superconducting material having higher critical temperature is prepared, and the superconducting material has the superconductivity under the condition of high temperature.