370results about How to "Raise the temperature gradient" patented technology

The invention discloses a composite intumescent flame retardant which is composed of the following components in percentage by weight: 50-65% of acid source, 10-20% of gas source, 15-20% of carbon source and 10-20% of smoke inhibitor. The acid source is composed of at least one of ammonium polyphosphate, melamine phosphate and melamine polyphosphate, wherein the ammonium polyphosphate is crystal II ammonium polyphosphate with the average degree of polymerization of greater than 1000; the gas source is composed of at least one of melamine and dicyandiamide; the carbon source is composed of at least one of pentaerythritol and bis pentaerythritol; and the smoke inhibitor is composed of at least one of magnesium hydroxide, aluminum hydroxide and zinc borate. The invention also discloses a preparation method of the composite intumescent flame retardant.

The invention discloses dual-beam laser selective melting and moulding equipment with an exchangeable powder cylinder. The equipment comprises two optical systems, a frame, a workbench plate, a powder feeding cylinder, a powder storage cylinder, a moulding cylinder, a powder returning cylinder, a moulding cavity, and two first driving mechanisms, which are used to respectively drive the moulding cylinder and powder feeding cylinder to move up and down. The workbench plate is fixed on the frame, the moulding cavity is fixed on the upper surface of the workbench plate, and the powder returning cylinder, the moulding cylinder, the powder feeding cylinder, and powder storage cylinder are fixed on the lower surface of the workbench plate from left to right in sequence. A scraper is arranged in the moulding cavity, and a second driving mechanism is arranged on the frame. A substrate is arranged in the powder feeding cylinder, a substrate is arranged in the moulding cylinder, the lower ends of the powder feeding cylinder and the moulding cylinder are both provided with a cylinder end cover, and the substrates are connected to a first piston system. A second piston system is arranged in the powder storage cylinder. The provided equipment has a high moulding efficiency and is capable of effectively reducing the deformation and cracking of members.

The invention discloses a method for adjusting/reducing the internal stress of a laser additive manufacturing part. The method is used for laser coaxial powder feeding additive manufacturing, and comprises the following steps that (1) a three-dimensional additive manufacturing part model is established, and contour level information of the part is obtained; (2) a workbench is moved to a fusion covering station, and coaxial powder feeding laser additive manufacturing is conducted through a fusion covering head, and after processing of a fusion covering layer is completed, the workbench is descended by the height of one layer; (3) the workbench is moved to an impacting station, bulk heating is conducted on the fusion covering layer, after the fusion covering layer reaches the set temperature, laser impacting and strengthening are conducted on the fusion covering layer through an impacting head, and the set temperature is higher than the recrystallization temperature of a material and lower than the melting point of the material; and (4) the steps (2) and (3) are conducted repeatedly till the three-dimensional part is manufactured. According to the method, the residual compressive stress introduced by the laser impacting and strengthening technology is utilized to adjust and counteract the pulling stress in the hot melting process, and the laser thermal composite additive manufacturing method controllable in internal stress is achieved.

The invention relates to the manufacture technical field of polysilicon ingot furnaces, and aims to provide a closed cooling system of a gas cooled polysilicon ingot furnace. The system comprises a heat exchange platform positioned on a supporting column and used for placing a crucible, wherein a cooling gas channel is arranged in the heat exchange platform; a gas inlet and a gas outlet at two ends of the cooling gas channel are respectively connected with a cooling gas inlet pipeline and a cooling gas outlet pipeline; and the heat exchange platform, the cooling gas inlet pipeline, the cooling gas outlet pipeline, a cooling gas power pump group and a cooler form a closed circulation loop of the cooling gas. Compared with the cooling method of radiation cooling and water cooling, the system related by the invention has strong gas cooling control capacity and high industrial controllability; the gas is fed into the heat exchange platform evenly, so that the whole temperature of the heatexchange platform is even, which is in favor of even nucleation of a silicon melt at the bottom of the crucible; and the reducing speed of the temperature at the bottom of the crucible can be precisely controlled during the crystal growth.

The invention discloses a manufacturing method of a ceramic mold of a monocrystal turbine blade. The integral ceramic mold with a special spiral crystal selector is designed and manufactured according to grain orientation requirements of the monocrystal turbine blade. When orientated solidification is used for manufacturing the monocrystal blade, the thickness of a shell at an abrupt change in a section (such as a connecting part between a blade body and a marginal plate) is increased, and the heat transfer capacity is reduced, so that crystal defects such as stray crystals are caused easily. On the premise that the casting strength requirements are met, with the adoption of topological optimization and design of a heat transfer passage, the heat transfer capacity of the mold is improved, and a temperature gradient on the leading edge of a solid-liquid interface during the orientated solidification is increased, so that the whole blade can obtain a good monocrystal organization.

The invention relates to a method for controlling the rice steaming and boiling of an electric rice cooker, which comprises the following steps: (1) confirming the boiling maintenance time t and the boiling maintenance temperature X of the electric rice cooker according to different rice kinds and mouth feeling; (2) starting the electric rice cooker and soaking, dewatering, heating and boiling rice according to a set procedure; (3) achieving the boiling maintenance temperature X= 130-165 DEG C after time t1=15-35 min and maintaining boiling in the electric rice cooker for the maintenance time t=6-10 min; and (4) cooking the rice after achieving the maintenance time t. The invention provides the method for controlling the rice steaming and boiling of the electric rice cooker, which controls the temperature and the time in the process of boiling maintenance, improves a temperature difference between the electric rice cooker and rice boiling, enables the rice to be fully gelatinized and enables water to be fully vaporized and absorbed by rice grains, thereby boiling the rice with high quality.

The invention relates to a multistage division regenerative carbon dioxide trapping system. The system comprises an absorption tower, wherein rich liquor that flows out of the absorption tower is divided into two channels; a first pipeline is communicated with a rich liquor inlet formed in the upper part of a regeneration tower; a second pipeline is communicated with the rich liquor inlet of a rich and poor liquid heat exchanger; rich liquor that flows out of the rich and poor liquid heat exchanger is further divided into two channels; one channel is communicated with a rich liquor inlet formed in the central part of the regeneration tower; the other channel is communicated with the rich liquor inlet of a rich liquor reheater; the rich liquor outlet of the rich liquor reheater is communicated with the rich liquor inlet of a rich liquor flash tank; the rich liquor outlet formed in the bottom of the rich liquor flash tank is communicated with a rich liquor inlet formed in the lower part of the regeneration tower. According to the invention, the regeneration degree of the rich liquor can be increased and steam heat consumption needed during rich liquor regeneration can be reduced; in addition, steam condensates can be recycled in the lyophobic collecting box of main equipment to reduce the desalted water consumption of the trapping system.

The invention provides an integrated device and method for conducting smelting and electromagnetic-ultrasonic coupled continuous casting on the vacuum condition and belongs to the field of metal casting. The integrated device comprises a first vacuum chamber, a second vacuum chamber, a vacuum control system, a material supplementing device, an ultrasonic treatment device and a throwing device. According to the integrated device and technology for conducting smelting and electromagnetic-ultrasonic coupled continuous casting on the vacuum condition, the device can be widely applied to horizontal continuous casting of a high-temperature alloy, a titanium alloy, a magnesium alloy, a rare earth metal, multi-component amorphous alloy, high-entropy alloy and other active alloys, smelting, pouring and continuous forming under electromagnetic and ultrasonic coupled fields of the alloys can be all completed in the vacuum state, and the obtained horizontal continuous casting alloy workpiece has the effects of being smooth and clean in surface, uniform in component and dense in structure.

The invention relates to a cooling method used for directional solidification and a cooling device therefor. In the method, liquid metal is taken as cooling liquid, and a formwork is cooled by adopting the spray cooling method independently or adopting the spray cooling method and the immersion cooling method simultaneously. For the cooling device, a liquid metal spraying device is arranged under a direction solidification holding furnace, and the liquid metal is taken as the cooling liquid to cool the pull-down formwork by spraying independently or accompanying with the immersion. The invention has the advantages that the thermal radiation of a heating area and a cooling area for direction solidification can be insulated; and the cooling liquid is recycled, so as to cool the cooling liquid in cycling.

The invention discloses a preparation method of a thin-wall high-strength mold shell for single crystal blade manufacturing. The preparation method comprises the following steps of: A1, a shell manufacturing process: (1), size preparation, (2) slurry hanging, (3) sand spraying, (4) repeating the operations till preset number of layers are formed, (5) slurry sealing, dipping a wax mold in a slurry barrel, completely dipping, taking out, and drying; and A2, winding carbon fibers and drying. The carbon fibers are wrapped; compared with a traditional silicasol mold shell, the thin-wall high-strength mold shell has the advantages that under the precondition of ensuring the thermal strength of the mold shell, the layer number of the mold shell is reduced, so that the integral thickness of the mold shell is reduced, the heat conduction capacity of the mold shell is improved, and the preparation method is beneficial to the improvement of temperature gradient. Adopted carbon fiber cloth is made of amorphous graphite; and the amorphous graphite has a thermal conductivity lambda 2 of more than 100, and is an ideal heat conduction material; and the amorphous graphite has a tensile strength of more than 3,400 MPa, and creates a condition for reducing the thickness of the mold shell.

The invention relates to polycrystalline silicon ingot furnace equipment, and aims to provide a heat exchange platform of an improved structure for a polycrystalline silicon ingot furnace. The heat exchange platform is used for holding a polycrystalline silicon ingot furnace crucible and realizing heat exchange, and is provided with a gas inlet and a gas outlet; and the interior of the heat exchange platform is provided with a cooling gas channel, and is connected with the gas inlet and the gas outlet. Compared with the radiation cooling and the water-cooling type cooling technologies, the heat exchange platform disclosed by the invention is strong in control capacity and high in industrial controllability when being used for gas refrigeration; and furthermore, because the gas enters the heat exchange platform uniformly, the overall temperature of the heat exchange board is uniform, so that the uniform nucleation of a silicon melt at the bottom of the crucible is facilitated, and the temperature reduction speed at the bottom of the crucible in the crystal growth process can be precisely controlled.

The invention relates to a rotary magnetic field generating device for welding. The rotary magnetic field generating device comprises a coil support (2). A welding gun fixing clip (7) is fixedly arranged in the center of the coil support through a welding gun fixing bracket (6); and a welding gun (1) is installed on the welding gun fixing clip (7). Two groups of coils in the same height are fixedly arranged on the coil support (2), and the two groups of coils are spaced by 90 degrees. The two groups of coils are respectively connected with an excitation power supply through a waveform positioner; the two groups of coils are adjusted and are respectively connected with a synchronous sine alternating current and a synchronous cosine alternating current. A phase difference between the sine alternating current the cosine alternating current is 90 degrees. After being electrified, a magnetic field parallel to a coil axis is generated in the middle of each group of coils; and the magnetic field also changes in sine and cosine along with the changes of the electric current. The magnitude of the magnetic field is unchanged during a circling motion along the magnetic field direction, and accordingly a welding arc is also in the circling motion along with the magnetic field. When the welding gun moves forward, the electric arc moves forward spirally to finish the welding.

The invention provides an active cooling device and method for laser repairing of a single crystal turbine blade. The device comprises an air compressor, a heat exchanger and an annular cooling device. The air compressor compresses air to be cooled into high-speed and high-pressure airflow, and the airflow is introduced into the heat exchanger. After the introduced airflow is cooled by the heat exchanger, the airflow is introduced into the annular cooling device. The annular cooling device is arranged above a workbench of a laser cladding system and arranged around a workpiece. According to the active cooling device and method for laser repairing of the single crystal turbine blade, the volume and temperature of the cooled airflow and the position and angle of a cooling nozzle are adjusted, so that the best active cooling effect is achieved in the laser repairing process.

The invention discloses a method and device for controlling nickel-based high-temperature alloy brittle phase during laser additive manufacturing. The method comprises the steps that a nickel-based high-temperature alloy sample is clamped onto a numerically-controlled workbench, the machining position of the sample is determined, laser is applied to the machining position to form a molten metal bath, an electromagnetic field is applied to the molten metal bath, powdered metal is fed to the molten metal bath, undergoes melting under action of the laser and undergoes solidification under actionof the electromagnetic field to form a shaped sample, and machining of the nickel-based high-temperature alloy is completed. By adoption of the method or the device, the problem that in the traditional nickel-based high-temperature alloy additive manufacturing process, precipitation of interdendritic LAVES brittle phases cannot be reduced is solved.

The invention relates to a tank furnace for producing basalt continuous filament and pertains to the technical field of novel inorganic non-metallic material processing equipment, the main characteristics are that the furnace body consists of a melting tank and material channels, the melting tank and the material channels are connected by non-submerged dog-holes, the melting tank is divided into a melting area and a homogenization area, a burner is arranged at the top of the furnace vertically, the burner guns of melting area and the feeding pipes are arranged in intervals, and the strong melting area of even feeding and even heating is formed. The material channels are arranged in three directions in the homogenization area of the melting tank, burner guns are arranged in the material channel in sections, the temperature of the fused mass in the material channels is guaranteed, more than 12 wiredrawing shaping areas are evenly arranged in each material channel so as to supply basalt melt mass for the wiredrawing bushing well, emptying devices are arranged at the tail part of the melting tank and the tail parts of all material channels, during the operation, the operation of discharging the meltwater can be carried out when impurities are stored in the meltwater for a long time or the varieties of raw materials are changed. The invention is in favor of improving the quality and industrialized production of the basalt continuous filament.

A top heat field for preparing 6-inch and 8-inch heavyly doped monosilicon by straight pulling up is composed of an insulating cover consisting of the upper and lower hollow trancated cones, and an upper cover plate fixed to the top of said insulating cover and put on a supporting pipe. It can enhance the scavenge action of the airflow on the surface of molten body for removing the fine particles from the surface.

An integrated eFUSE device is formed by forming a silicon “floating beam” on air, whereupon the fusible portion of the eFUSE device resides. This beam extends between two larger, supporting terminal structures. “Undercutting” techniques are employed whereby a structure is formed atop a buried layer, and that buried layer is removed by selective etching. Whereby a “floating” silicide eFUSE conductor is formed on a silicon beam structure. In its initial state, the eFUSE silicide is highly conductive, exhibiting low electrical resistance (the “unblown state of the eFUSE). When a sufficiently large current is passed through the eFUSE conductor, localized heating occurs. This heating causes electromigration of the silicide into the silicon beam (and into surrounding silicon, thereby diffusing the silicide and greatly increasing its electrical resistance. When the current source is removed, the silicide remains permanently in this diffused state, the “blown” state of the eFUSE.

The invention discloses a method for obtaining aluminum oxide-based ternary melt grown ceramic tissue morphology, which comprises the following steps of: combining zone melting and liquid metal cooling, and performing directional solidification on a plurality of precast bodies formed by using aluminum oxide, yttrium oxide and zirconium oxide respectively; and taking the longitudinal sections and the transverse sections of the directional solidified precast bodies, performing conventional metallographic treatment, and performing surface metal spraying to obtain tissue morphology and interface morphology of the aluminum oxide-based ternary eutectic oxide melt grown ceramic at different growth rates. In the directional solidification, the withdrawing rate is 1 to 10,000mum/s, and the laser power is 200 to 1,500W. The obtained directional solidification tissues are greatly different from the tissues in a melting zone and have no obvious tissue transition zone, and the interface morphologyis preserved perfectly.

The invention discloses a planar flexible thermoelectric power generation structure which includes a thermal conduction layer, an insulating layer, a power generation layer and a hot-end protective layer, which are sequentially arrayed and laid from bottom to top. All of the thermal conduction layer, the insulating layer, the power generation layer and the hot-end protective layer adopt flexible materials. A first flexible material and a second flexible material are closely arrayed alternatively so that the thermal conduction layer is formed. The hot-end protective layer is a flexible insulating strip. Both of the heat conduction factors of the first flexible material and the flexible insulating strip are lower than the heat conduction factor of the second flexible material. The structure increases protection of a hot end and heat radiation of a cold end, improves the temperature gradient of a thermoelectric power generator and further improves an output power and an output voltage. The thermal conduction layer provides a temperature gradient needed by the thermoelectric power generator and has a support function; the flexible materials are adopted so that compared with a rigid thermoelectric power generation device, the power generation structure is flexible, light and convenient and capable of better fitting to the plane; and the power generation structure is simple in structure and manufacturing process and capable of realizing mass production, and has an excellent application prospect.

The invention discloses an acid-resistant glass fiber and fabric prepared by the glass fiber. The acid-resistant glass fiber comprises the following components by mass percentage: 59-65% of SiO2, 15-20% of Al2O3, 5-10% of MgO, 4-16% of CaO, 0.1-1% of R2O, 0.1-1% of Fe2O3, and 1-2.5% of TiO2, wherein R2O is a mixture of Na2O, Li2O and K2O at any matching ratio. The obtained fabric has the characteristics of high strength, good high-temperature resistance, high corrosion resistance, good air permeability and the like, and facilitates flue gas filtering; a weaving composite emulsion and a puffed weaving impregnating compound which are used by wire drawing can be removed easily; and the aftertreatment technology capability of the fabric is ensured.

The invention belongs to the technical field of refractory materials, especially refractory materials for nonferrous smelting, and especially relates a copper composite high-performance magnesia-chrome brick and a manufacturing method thereof. The brick comprises 1-10 wt% of copper composite magnesia-chrome synthetic sands with the particle size being 3-5 mm, 10-35 wt% of copper composite magnesia-chrome synthetic sands with the particle size being 1-3 mm, 10-25 wt% of copper composite magnesia-chrome synthetic sands with the particle size being 0.088-1 mm, 1-5 wt% of fused magnesia-chrome sands with the particle size being 3-5 mm, 1-15 wt% of fused magnesia-chrome sands with the particle size being 1-3 mm, 2-13 wt% of fused magnesia-chrome sands with the particle size being 0.088-1 mm, 5-20 wt% of fused magnesia-chrome sands with the particle size being not more than 0.088 mm, 1-5 wt% of fused magnesia with the particle size being 3-5 mm, 1-15 wt% of fused magnesia with the particle size being 1-3 mm, 2-13 wt% of fused magnesia with the particle size being 0.088-1 mm, 5-20 wt% of fused magnesia with the particle size being not more than 0.088 mm, 2-10 wt% of chromium concentrate with the particle size being not more than 0.088 mm, 1-6 wt% of a composite additive and 3-5 wt% of an (externally added) binder. Magnesia-chrome brick wastes generated by the nonferrous smelting can be fully used reasonably and effectively in the invention.