266results about How to "Reduce thermal shock" patented technology

The invention relates to recycle and reuse technology of electronic castoff, in particular to a method and a device to remove the element and separate the welding material from the circuit board. The invention discloses the method and the device which separates and recycles the welding material and removes the elements on the circuit board with high efficiency. The technic proposal of the invention adopts the melting welding material as the heating medium and heats the welding pots on the welding surface of the circuit board; the welding material is separated from the circuit board by utilizing the special nozzle to spray high-temperature high-pressure gas; finally, the circuit board is turned over and vibrated, separating the element from the circuit board. The invention has the beneficial effects that the element is subject to small heat impact during the removal process, the element after removal has high intact rate and repeated ratio, and the new impurity is not brought in during the removal process. The invention has the advantages of complete separation of welding pot, high removal ratio of elements, low energy consumption, environment-friendship, etc.

A method of forming an elongated metal blank into a structural component having a predetermined outer configuration. The method includes providing a shape imparting cavity or shell section formed from a rigid material which includes an inner surface defining the predetermined shape, placing the metal blank into the cavity or shell section, and forming the metal blank into the component by heating axial portions of the metal blank and forcing a fluid at a high pressure into the metal blank until the metal blank at least partially conforms to at least a portion of the inner surface of the cavity or shell section to form the structural component.

The invention provides phase-change energy storage microcapsules comprising a first phase-change material, a first wall capsules coated on the first phase-change material, and sub-microcapsules distributed in the first phase-change material. The sub-microcapsules comprise a second phase-change material and second wall capsules coated on the second phase-change material. Also, the invention provides a method for preparing the phase-change energy storage microcapsules provided by the invention. The method comprises the steps such as sub-microcapsule preparation, first phase-change material coating, first wall capsule preparation, and the like. The phase-change energy storage microcapsules provided by the invention have the advantages of failure resistance, long service life, and good stability.

The invention provides a phase change memory unit and a method for manufacturing the phase change memory unit. A memory medium layer of the phase change memory unit is a superlattice thin film structure which is composed of an Sb[x]Te[1-x] layer and a Ti[y]Te[1-y] layer, and then a stable layered (Sb[x]Te[1-x])-(Ti[y]Te[1-y]) phase change material is obtained, wherein 0.4<=x<=0.8, 0.33<=y<=0.56, the thickness of the Sb[x]Te[1-x] layer is between 1 nm and 10 nm, and the thickness of the Ti[y]Te[1-y] layer is between 1 nm and 10 nm. The phase-change mechanism of the superlattice (Sb[x]Te[1-x])-(Ti[y]Te[1-y]) phase change material manufactured with the method is completely different from that of a traditional Ge-Sb-Te phase change material, and thus an obtained phase change memory device has the advantages of being lower in power consumption, higher in phase change speed, higher in retentivity, longer in service life and the like.

The invention discloses a roller cooling system and a cooling control method thereof. The roller cooling system adopts a system combined with exterior cooling and interior cooling, and the roller cooling control method is realized through a feedback-control loop consisting of a series of instrument equipment and a closed loop control system consisting of roller cooling control models. With the use of the method, the roller surface temperature and the roller interior temperature can be detected, fed back and calculated, moreover, each area of the roller surface is controlled alone through the closed loop control system; the heat convexities in the radial direction of the roller and in the peripheral and axial directions of the roller surface can be effectively controlled; the heat shock is reduced; and the service life of the roller is effectively prolonged by more than one time according to the field application statistics. The control models are simple and convenient to set and adjust, can precisely control the roller surface aerosol cooling injection amount, and guarantees no affection of rolling mill coolant on the surface quality of a continuous casting billet in the rolling mill position.

The invention discloses a simple method for manufacturing a ceramic-metal composite wear-resistant part. The simple method for manufacturing the ceramic-metal composite wear-resistant part is characterized by comprising the following steps of obtaining a steel wire gauze, stamping a groove in the steel wire gauze, filling ceramic particles in the groove after surface wetting treatment is conducted on the ceramic particles, taking another steel wire gauze to cover the first steel wire gauze so that the groove can be shielded and scattering of the ceramic particles can be avoided, fixing the steel wire gauze with the ceramic particles fixed on a corresponding position, need to be enhanced, of the mold cavity wear-resistant part, and pouring and casting matrix metal liquid to obtain the wear-resistant part. The simple method for manufacturing the ceramic-metal composite wear-resistant part has the advantages of being even in distribution of the ceramic particles, firm in combination with matrix metal, capable of giving full play to the characteristics of ceramic and metal and achieving high-resistant performance and high-impact-resistant performance, simple, easy and convenient to operate, capable of being produced in large scale or in batch, and low in cost.

The invention relates to a forging technology and a device, in particular to aluminum alloy liquid forging molding technology and a module. In light of the technical problems that the prior art adopts complex module and process not suitable for aluminum alloy liquid forging, etc., the invention provides the forging module with simple structure and easy operation as well as the aluminum alloy liquid forging molding technology with reasonable process. The main technical proposal of the invention is as follows: a lower left module and a lower right module are arranged and fixed on a lower template in parallel, and a cylinder bottom punch gets through the lower template and is arranged between the lower left module and the lower right module; liquid aluminum alloy is injected into a cavity through a pouring port between the lower left module and the lower right module; an upper module is arranged on the lower left module and the lower right module and a pillar is also arranged and fixed; when in forging, the cylinder bottom punch conducts upward squeezing movement on liquid aluminum alloy; after meeting forging requirement, pressure can be maintained for 30 to 50 minutes.

The invention relates to a shell for packaging a microwave assembly and a laser sealing method of the shell. The shell for packaging the microwave assembly comprises an aluminum silicon alloy shell and a 4047 aluminum alloy cover plate, wherein the aluminum silicon alloy shell is abutted with the 4047 aluminum alloy cover plate. The laser sealing method comprises the following steps of: cleaning the aluminum silicon alloy shell and the 4047 aluminum alloy cover plate by using acetone, then abutting the aluminum silicon alloy shell with the 4047 aluminum alloy cover plate by using a tool, then fixing the aluminum silicon alloy shell and the 4047 aluminum alloy cover plate by using an Nd:YAG laser, and continuously integrally welding the shell by using the Nd-YAG laser, welding from the bottom of the aluminum silicon alloy shell until reaching the surface of the 4047 aluminum alloy cover plate, wherein the two welding processes are carried out in a nitrogen protective gas. The invention is used for carrying out sealing by using the laser, is easy to realize, has good sealing property and controllable welding depth, can be used for repaired for two times, has little thermal impact to a substrate and a chip because local heating is adopted in the welding process, can realize automatic operation, and has no soldering flux pollution and high reliability.

The invention provides a bifacial circuit board surface assembly process, wherein the process mainly comprises the following steps: firstly, assembling assembly parts on the first surface of a printed circuit board printed with solder paste; secondly, overturning the printed circuit board by a tilter, assembling the assembly parts on the second surface of the printed circuit board printed with the solder paste; thirdly, passing the assembled printed circuit board through a reflow oven, and welding the assembled parts on the printed circuit board; and finally, inserting plug-in assembly parts in the printed circuit board. In the bifacial circuit board surface assembly process of the invention, the printed circuit board only passes through the reflow oven once, the printed circuit board has the advantages of less heat shock, less oxygenation, no circular flow and less printed circuit board damage.

The present invention discloses a hollow cathode heater and a hollow cathode structure, the heater comprises an inner ceramic skeleton (4), a heating wire (5) and an outer ceramic sleeve (6); outer side of the inner ceramic skeleton (4) and/or inner side of the outer ceramic sleeve (6) has a first a structure; the first structure is any one or any combination of a protrusion, a groove or a smoothsurface; the outer ceramic sleeve (6) is nested outside the inner ceramic skeleton (4), a first space is surrounded and formed between the outer side of the inner ceramic skeleton (4) and the inner side of the outer ceramic sleeve (6) through the first structure. The hollow cathode heater is easy to process and assemble, has high mechanical strength and high reliability, and has a serpentine heating wire, with induced magnetic fields at adjacent positions cancelling each other, can effectively reduce an induced voltage and an induced current generated by the induced magnetic fields at the ignition moment, reduce thermal shock of the heating wire and improve reliability and life span of a space electric propulsion system.

A high-safety valve for nuclear power unit is composed of three functional modules: safety release, fast isolation and forced opening or closing. It has a primary valve and a secondary valve. When external valve flap is closed, the safety release and secondary valve can be cut off at the same time. Its advatnages are small size, light weight, high reliability and long service life.

The invention provides an ultra-low speed aluminum alloy die-casting system. The system comprises an aluminum alloy die casting machine and a heat preserving furnace, wherein the heat preserving furnace is provided with a quantitative pouring pump, wherein the quantitative pouring pump is connected with a liquid conveying pipeline; the outlet end of the liquid conveying pipeline is provided with a liquid conveying groove connected to a funnel on a die-casting chamber channel; a refractory mortar layer is laid on the surface of the liquid conveying groove; a release coating layer is sprayed on the surface of the refractory mortar layer; a release coating layer is uniformly coated on the surface of the funnel; the thickness of the release coating layer is between 3 and 5 millimeters; and an included angle between the liquid conveying groove and an ejection horizontal plane is between 15 and 25 degrees. The invention also provides an alloy melt temperature control range and an operation specification for the heat preserving furnace of the system. Through system setting, molten metal flows through a chute and the funnel before casting; and due to the adoption of small-angle ultra-low speed die casting and shaping, the molten metal flows stably without eddy current or splashing, gas inclusion in a shaping process is decreased, the surface of a casting molded by die casting is flat and smooth, crystal particles are fine and air holes inside a product have a small number of defects.

The invention relates to a method for preparing an originated multi-section yttrium vanadate laser crystal. By utilizing a flux growth method, an undoped yttrium vanadate crystal with a certain thickness is grown at two ends of a rare earth-doped yttrium vanadate laser crystal so as to prepare the multi-section yttrium vanadate laser crystal. The surface adsorption of the prepared undoped crystal or neodymium-doped crystal is less than 2,150ppm/cm, and the crystal can meet the application requirement of high-power lasers.

The invention provides a combustion chamber of a wide speed range ramjet engine and a working method thereof, wherein the combustion chamber comprises an air inlet connecting section (1), a forward-inclined concave combustion chamber (2) and a tail nozzle (3), wherein the air inlet connecting section (1), the forward-inclined concave combustion chamber (2) and the tail nozzle (3) are arranged successively; the air inlet connecting section (1) is a bridge component, through which a variable supersonic air inlet outlet is connected with the combustion chamber inlet, the area of the forward-inclined concave combustion chamber (2) is larger than that of the air inlet connecting section (1); the air inlet connecting section (1), the forward-inclined concave combustion chamber (2) and the tail nozzle (3) as well as the structure of the combination of the air inlet connecting section (1), the forward-inclined concave combustion chamber (2) and the tail nozzle (3) is symmetrical with a centralplane, or rotationally symmetrical with a central axis.

The invention discloses an evaporation control device used in a refrigerating system, comprising a programmable evaporation controller, an electronic expansion valve and a sensor, wherein, the programmable evaporation controller is connected with the electronic expansion valve, and is connected with an evaporator through the sensor; and the electronic expansion valve is arranged on a refrigerant input pipeline of the evaporator; the sensor is used for detecting the temperature and the pressure in the evaporator, and outputting the detected temperature and pressure signals to the programmable evaporation controller; the programmable evaporation controller is used for receiving the detected temperature and pressure signals detected by the sensor; the opening and closing of the electronic expansion valve as well as the opening time and the opening of the electronic expansion valve are controlled according to the signals; and the electronic expansion valve is used for controlling the amount of the refrigerant entering into the evaporator under the control of the programmable evaporation controller, thus realizing the accurate control on the temperature in the evaporator. By utilizing the evaporation control device provided by the invention, the accurate control on the temperature and the pressure is realized, the reaction sensitivity is improved, and the energy consumption is lowered.

The invention discloses a method for roasting an aluminum electrolytic bath with a polymorphic structure cathode, which comprises the following steps of: filling a concave part on the surface of the polymorphic structure cathode with aluminum powder or aluminum blocks with shapes corresponding to that of the concave part to ensure that the filled surface and a convex surface of the polymorphic cathode are in the same horizontal plane; paving a layer of coke particles on a plane of the cathode; hanging an anode on the layer of the coke particles, and electrifying and roasting the aluminum electrolytic bath until 60 to 70 percent of the area of the surface of the cathode reaches or exceeds 900 DEG C; and when over 60 percent of the area in the electrolytic bath has a fused electrolyte with the thickness of 10 centimeters, infusing the electrolyte into the electrolytic bath to perform a wet method or adopt a dry method to start the roasting. The aluminum block/powder-coke particle composite roasting technique is favorable for the even distribution of the current and the temperature on the surface of the cathode and the reduction of heat vibration, thereby not only preventing an aluminum liquid roasting method from performing thermal shock on an inner lining of the cathode, but also solving the problems of uneven distribution of the current of the cathode and the like caused by large differences of the coke particle thickness when the aluminum electrolytic bath with the polymorphic structure cathode singly adopts coke particle roasting, and improving the roasting quality of the inner lining of the cathode.

The invention provides a single battery being capable of resisting overloading and high-spinning and being high in capacity. A preparation method includes the steps of: successively tightly laminatinga nickel square-mesh net, a graphite sheet, positive powder, insulation powder, a negative pole sheet and a current collector; surrounding and compacting the outer rings of the insulation powder andthe negative pole sheet by a current blocking ring which is produced by mixing and pulping MgO and asbestos according to mass ratio of 2:1 and punching the mixture into a ring; the insulation powder is a mixture of LiCl-LiBr-LiF ternary eutectic substance and MgO according to the mass ratio of 1:1-1:1.5, wherein the mixture is compressed to form an insulation layer being 0.4-0.6 mm in thickness; the positive powder is a CoS2/FeS2 mixture according to the mass ratio of 1:1, wherein the positive powder also contains insulation powder accounting for 15-18% by mass of the positive powder and lithium oxide accounting for 2-5% by mass of the positive powder. The single battery has strong anti-severe environment capability, can output stable voltage and is high in specific energy, and also satisfies the demand of resisting overloading and high-spinning and being long in service life.

The invention provides an insulation cover for sealing a tank mouth of a torpedo car, which can effectively reduce heat loss in a process of transporting hot metal. The insulation cover comprises a steel shell, honeycomb firebricks, annular cover plates, stepped holes, riveting pieces, positioning supports, an inner-layer refractory material, an outer-layer refractory material, rain baffling devices, an annular positioning piece, cuboid rib plates and U-shaped lifting lugs. The stepped holes formed in the insulation cover disclosed by the invention can stabilize the air pressure in a tank cavity and lower thermal shock on materials of the insulation cover on the premise of guaranteeing reduction of thermal radiation passing through the tank mouth to play a role of protection; the firebricks are in shapes of circular honeycombs, and made of refractory clays, thereby capable of having a thermal shunting effect to effectively alleviate the thermal shock on a cap body; the rib plates are arranged to reinforce the strength of the insulation cover so as to facilitate heat dissipation. The insulation cover disclosed by the invention is simple in structure, convenient to operate, capable of effectively reducing the thermal radiation of the tank mouth and obvious in energy-saving effect.