60results about How to "Solve thermal stress" patented technology

The invention relates to an internal and external fin bayonet-tube type high temperature exchanger, which comprises a casing, a tube box which is connected on the casing, a closed head, a longitudinal baffle, a baffle plate, tube plates of an internal tube and an external tube, a tube side inlet and outlet pipe, a casing side inlet and outlet pipe, wherein one ends of the internal tube and the external tube are respectively fixed on the tube plates of the internal tube and the external tube, and the other ends are both free ends, the internal tube is a honeycomb duct whose two ends are open, and the external tube is a heat exchange tube whose one end is open, and the other end is closed, the internal and external walls of the external tube are respectively provided with an internal fin and an external fin to form an internal and external fin bayonet-tube heat exchanging unit, and the internal fin can relatively move to the internal tube. The exchanger is divided into a high temperature shell pass and a low temperature shell pass, the components of the two shell passes are respectively produced by high temperature-resistant material and common material, also can be produced by the same material. The internal walls of the casing, the longitudinal baffle and the tube plates of the internal tube and the external tube are provided with ceramic insulating layers, and fluid on two sides of a shell is crossly flow in reverse directions. The invention can increase the heat exchange efficiency and compactness of the exchanger, reduces production cost, and can overcome the thermal stress problem, and can be applied in high temperature condition.

The invention relates to a method for preparing a copper-base tungsten coating through a compounded process of laser and thermal spraying. The method is characterized by comprising the following steps of: preparing a nickel base alloy transition bottom layer on the surface of a copper matrix by using a low pressure plasma coating system, and remelting the transition bottom layer with laser beams; and then preparing an intermediate transmission layer and the tungsten coating of a Ni-W alloy by using the low pressure plasma coating system, and then remelting with the laser beams to obtain the tungsten coating. By using a gradient coating structure, the method effectively solves the problem of thermal stress caused by mismatching of the coefficient of thermal expansion of the copper and the tungsten, and improves the cohesion strength of the tungsten coating and the matrix, the tungsten coating and the tungsten coating. The coating and the matrix can achieve metallurgical bonding by using the laser beam remelting, bonding property is also improved and the tungsten coating with compact surface is obtained. The tungsten coating prepared by the method has excellent anti-heat radiation and anti-thermal shock properties and is suitable to be used as heated end component materials in equipment, such as first wall material in a ray target, a rocket nozzle, an airplane nozzle throat and a nuclear fusion device.

The invention discloses a thermal stress relief process of a prefabricated rod. The process includes: heating the prefabricated rod to a stress relief temperature; maintaining the prefabricated rod for a predetermined period of time at the stress relief temperature; cooling the prefabricated rod from the stress relief temperature to a predetermined temperature by a first predetermined cooling rate; cooling the prefabricated rod from the predetermined temperature to room temperature according to a second predetermined cooling rate, with the first predetermined cooling rate being smaller than the second predetermined cooling rate. Phased cooling is implemented at the cooling stage of the prefabricated rod to ensure that the internal heat of the prefabricated rod can be diffused slowly and evenly, thereby effectively avoiding generating new thermal stress in the thermal stress relief process of the prefabricated rod. The thermal stress relief process can effectively solve the problem of new thermal stress generated after prefabricated rod reheating for thermal stress relief. The invention also discloses prefabricated rod thermal stress relief equipment utilizing the process.

The invention relates to a novel TSV switch board and a manufacturing method. The switch board comprises a substrate, the substrate is provided with a plurality of free columns, one ends of the free columns are separated from the substrate via gaps, the other ends of the free columns and the substrate are fixed in an insulation manner via insulating materials, the upper surface and the lower surface of the substrate and sidewalls of the free columns are covered by insulating layers, free end surfaces and fixed end surfaces of the free columns are all provided with ohmic contact formed by metal layers, the substrate is made of a low-resistance silicon material (<=0.1 ohm*cm), the insulating materials employed by indirect contact of the free columns and the substrate refer to one of silicon dioxide, glass frit, and resin, and the metal layers for forming ohmic contact with the free ends and the fixed ends of the free columns refer to one of copper, aluminum, gold, and tin. According to the switch board, the problem of thermal stress caused by mismatch of thermal expansion coefficient between Cu, Au, and W and the silicon substrate is fundamentally avoided, and the TSV switch board with low thermal stress is realized.

The invention belongs to the technical field of non-oxide ceramic connection and discloses a high-entropy alloy connection silicon carbide ceramic connecting part as well as a preparation method and application thereof. The high-entropy alloy connection silicon carbide ceramic connecting part is prepared by mixing high-entropy alloy AlCoCrFeNi powder with SiC powder, performing stirring and ultrasonic treatment by using absolute ethyl alcohol as a solvent so as to obtain a uniform brazing filler metal, uniformly smearing the brazing filler metal to a SiC surface after polishing, and performingthermal treatment through SPS (spark plasma sintering) sintering at 1000-1400 DEG C at connection pressure of 5-30MPa, wherein the structure of the connecting part is SiC/AlCoCrFeNi-SiC/SiC. When thehigh-entropy alloy is used as a connecting layer, not only is low-temperature connection of a silicon carbide ceramic achieved, but also the internal stress of the ceramic connector can be reduced, and the connecting part can be applied to harsh working environments at high temperatures and high pressure, and particularly can be widely applied to the nuclear industry.

The invention relates to a precise molded optical glass having a high refractive index and a low dispersion and an optical element, an optical parts or an optical assembly containing the optical glass. The refractive index nd of the optical glass is more than or equal to 1.74 but less than or equal to 1.82, an Abbe coefficient ud is more than or equal to 40.0 but less than or equal to 47 and a transformation temperature Tg is less than or equal to 600 DEG C. The optical glass contains the following oxide based weights: SiO2 of 1 to 5 wt. %, B2O3 of 14 to 30 wt. %, La203 of 18 to 28 wt. %, Gd2O3 of 5 to 20 wt. %, Ta2O5 of 2 to 13 wt. %, Li2O of 1to 5 wt. %, ZnO of 14 to 25 wt. %, ZrO2 of 2 to 6 wt. %, WO3 of 5 to 12 wt. %, Nb2O5 of 1 to 7 wt. %, Na2O of 0 to 1 wt. % and Yb2O3 of 0 to 1 wt. %. For favorable application, the optical component can be produced without finishing, such as lens for digital camera. The precise molded optical component can be applied to the fields of imaging, projecting, remote communication, photo-communication engineering and laser technique.

The invention discloses a method for forming a die bonding connection structure of a reflective LED at low temperature, which comprises the following steps of: forming a first metal layer on a first surface of a base plate, and providing an LED epitaxial structure on a second surface of the base plate; forming a second metal layer on a base body, wherein the material of the second metal layer is different from that of the first metal layer; applying a force to the base plate and the base body so that the first metal layer and the second metal layer produce plastic deformation and are primarily bonded together; and heating the base plate and the base body in a high temperature furnace, wherein the first metal layer and the second metal layer are subjected to solid state diffusion in an interface to form a diffusion alloy layer.

The invention discloses a multi-unit pipe type direct-current steam generator. The steam generator comprises a container body, a sleeve, a partition plate assembly and heat exchange units; a cavity is formed between the sleeve and the inner wall of the container body; the partition plate assembly divides the cavity into an upper cavity body, a middle cavity body and a lower cavity body; a first filler neck and a second filler neck are arranged on the container body; a water inlet channel of the second filler neck, the upper cavity body, the interior of the sleeve, the interiors of the heat exchange units, the lower cavity body and a water outlet channel of the first filler neck communicate with one another in sequence to form a primary side medium channel; the water inlet channel of the first filler neck, the middle cavity body and the water outlet channel of the second filler neck communicate with one another in sequence to form a water return channel; the top of the container body is provided with a steam chamber and a water supply assembly; the heat exchange units are provided with water supply pipelines; and the water supply assembly, the water supply pipelines, an inner flow passage of a heat exchange pipe and the steam chamber communicate with one another in sequence to form a secondary side medium channel. The steam generator has the advantage that the compact arrangement can be realized.

The invention discloses a bubbling type methane decomposition reaction device for high-temperature particle heating. The device is mainly applied to an ultra-high temperature condensation solar system. A plurality of special bubbling type direct methane decomposition reactor units are arranged in a main body part (a heat-carrying particle heat release tank) of the device; high-temperature heat-carrying particles downwards flow through the reactor units from the top of the heat release tank and transfer heat to heat-carrying fluid in the reactor units; methane bubbles are decomposed to producehydrogen and carbon nano-particles in the heat-carrying fluid; the carbon nano-particles and reactive gases are separated in the reactor units and extracted by an induced draft fan; and after discharged from the reactor units, the reacted mixed gases (the hydrogen and unreacted methane gas) are cooled to be fed into the next-stage reactor units to be continuously reacted or fed out of the device to enter a hydrogen separation system. According to the device disclosed by the invention, the heat-carrying fluid does not need to be fed out of the device to be heated, and safe and stable operationsof the system are ensured; and due to the modular design of the reactor units, the zoom design of the device is conveniently realized.

The invention discloses a special single-bin heating regeneration denitration system for low-temperature flue gas. The system comprises a low-temperature denitration system, a reheating system and an online ash removal system. In the system, a denitration catalyst has very high low-temperature denitration capacity; the reheating system is capable of heating every independent bin separately alone so as to enable the catalyst to recover activity; the online ash removal system has the advantages of being simple in structure, less in investment, convenient to operate, etc. After the low-temperature flue gas passes through the system, nitrogen oxides are reduced into nitrogen and water. The system is simple to operate, small in floor space, high in efficiency and low in cost.

The invention relates to a plane display panel and a plane display device. The plane display device is provided with a backlight module and a plane display panel; wherein, the plane display panel includes a pixel array circuit board and a first glass circuit board. The pixel array circuit board is provided with a pixel array; the first glass circuit board is provided with a first collective drive loop; wherein, the first collective drive loop is electrically connected with the pixel array. The invention makes use of the mutual electrical connection between the glass circuit board with collective drive loop and the pixel array circuit board and the collective drive loop is directly arranged on the glass circuit board, thus avoiding the thermal stress problem because of different thermal expansion coefficient.

The invention discloses an integrated single-cabin heating regeneration denitration system special for waste gas of an internal combustion engine. The integrated single-cabin heating regeneration denitration system is characterized by comprising a denitration reactor, an air inlet main pipeline connected with the internal combustion engine and an air outlet main pipeline connected with the denitration reactor, wherein the denitration reactor is divided into four reactor cabins, the denitration reactor is internally provided with a soot blower and a denitration catalyst, the denitration reactoris further provided with four maintenance doors, pressure transmitters are arranged at the joints of the denitration reactor with the air inlet main pipeline and the air outlet main pipeline; and a fan-shaped electric butterfly valve is arranged between the air inlet main pipeline and the denitration reactor, an ammonia spraying device is arranged in the middle of the air inlet main pipeline anda spoiler is positioned below the ammonia spraying device. The system is simple and flexible, can be used for conducting on-line heating regeneration and overhauling, and is simple to operate, small in occupied area and high in efficiency.

The invention relates to a special welding machine system for rapid metal forming through an electric arc method and a control method of the special welding machine system. The system comprises a controller, a rack, an electric arc power source, a wire feeding assembly and a voltage comparison device. A metal wire is arranged in the wire feeding assembly. A three-dimensional movement device is arranged on the rack. A welding gun head and a welding bottom plate which are connected with the wire feeding assembly are respectively arranged on the three-dimensional movement device. The metal wire penetrates into the welding gun head. The welding gun head and the welding bottom plate are electrically connected with the electric arc power source. The voltage comparison device is provided with a first voltage detection end, a second voltage detection end and a delay switch. The first voltage detection end is electrically connected with the welding gun head. The second voltage detection end iselectrically connected with the welding bottom plate. The delay switch is connected into a connecting line of the welding gun head and the electric arc power source in series or connected into a connecting line of the welding bottom plate and the electric arc power source in series. The system is adopted in the control method. According to the special welding machine system for rapid metal formingthrough the electric arc method and the control method of the special welding machine system, transient short-circuit time is controlled through the voltage comparison device, heat accumulation is reduced, and the problem of thermal stress is avoided.

The invention provides a wide-temperature-range huge negative thermal expansion metal-based composite material and a preparation method thereof, and belongs to the field of metal-based composite materials and preparation thereof. The raw material is La (Fe, Si) 13-based isotropic negative thermal expansion alloy; the preparation method comprises the following steps: weighing metal elementary substances in a stoichiometric ratio, smelting the metal elementary substances in an electric arc furnace, annealing to obtain La (Fe, Si) 13 alloys with different negative thermal expansion coefficients and temperature zones, grinding and mixing the La (Fe, Si) 13 alloys, and sintering the La (Fe, Si) 13 alloys through discharge plasma to obtain a target product. Alpha-Fe phases are generated among the components of the La (Fe, Si) 13 alloy, so that the mechanical property is improved, and the La (Fe, Si) 13 alloy can better adapt to extreme use environments. The La (Fe, Si) 13-based series alloy has huge negative thermal expansion in different temperature zones between-150 DEG C and 150 DEG C. The material obtained by compounding the La (Fe, Si) 13 alloy with different components has the characteristics of wide temperature range and isotropic negative thermal expansion.

The invention relates to a thermal treatment method, particularly a thermal treatment method for a solar battery encapsulating adhesive film. The adhesive film includes a polyolefin adhesive film, anEVA adhesive film or PVB. Constant-temperature and cooling shaping workshop sections are adopted. The objective is to allow the temperature to be higher than the melting point, the softening temperature or glass transition temperature of a material so that a thermal stress problem of an extruded film material is solved at a high temperature, the shrinkage problem of the material is thoroughly solved, and an option for increasing the speed of a production line is provided.

The invention discloses a method for preparing a tungsten-copper gradient composite material, which comprises the following steps of: preparing a porous tungsten framework of which the porosity is in gradient distribution by using a selective laser melting technology based on a single-component multi-copper and less-tungsten composite material, pressurizing and infiltrating copper under the protection of hydrogen, and finally, carrying out a two-pass rolling process, and carrying out annealing treatment, the tungsten-copper gradient composite material with synergistically improved heat conductivity, conductivity, strength and ablation resistance can be obtained. According to the method for preparing the tungsten-copper gradient composite material provided by the invention, the problem that in the prior art, the heat conductivity and the ablation resistance of a tungsten-copper composite material used for an electromagnetic railgun guide rail cannot be considered at the same time is solved.

The invention discloses a preparation method of a heat shock-resistant ceramic capacitor and pertains to the field of electric elements and material technology, in particular to a preparation method of a ceramic capacitor; the preparation method comprises the steps: the preparation of transition electrodes is added into the conventional ceramic-capacitor preparation engineering; single-layer or multi-layer transition electrodes with different silver contents are prepared at two sides of a ceramic chip; due to the different silver contents in the transition electrodes and electrode materials, the thermal conductivities of the transition electrodes and electrode materials are different; therefore, thermal gradient exists between the transition electrodes, which can relieve the thermal stress produced by the synergy of the ceramic capacitor in an environment in which the temperature changes dramatically. On the basis of ensuring electrical characteristics of the ceramic capacitor, the preparation method significantly improves the heat shock resistance of the ceramic capacitor so that the ceramic capacitor can adapt to the environment in which the temperature changes between minus 55 DEG C to 125 DEG C and particularly meets the performance requirements of a special ceramic capacitor in automotive electronics.

The invention discloses a converter deep waste heat recovery boiler. The boiler comprises an upper collecting box, a lower collecting box, a boiler outer wall and a boiler flue, wherein the boiler outer wall is isolated and connected with the upper collecting box and the lower collecting box; the boiler flue with a smoke inlet and a smoke outlet is formed among the upper collecting box, the lowercollecting box and the boiler outer wall; the boiler outer wall is of a cylindrical structure, and is composed of a plurality of outer wall pipes which are vertically arranged and a plurality of flatsteel bars, and the outer wall pipes are vertically communicated between the upper collecting box and the lower collecting box, and are evenly distributed at intervals along a circle, and a flat steelbar is hemetically welded between every two adjacent outer wall pipes; the boiler flue is internally provided with convection heating surface tubes, and the end parts of the convection heating surface tubes hemetically penetrate out of the boiler outer wall, and is hemetically communicated with the outer wall pipes. The converter deep waste heat recovery boiler has strong anti-explosion performance and good sealing performance.