95results about How to "No thermal stress" patented technology

The invention discloses a method for synthesizing a composite molecular sieve by a microwave method and catalytic performance application thereof. In the method for preparing the composite molecular sieve by the microwave method, kaolin is taken as a raw material, inorganic silicate is taken as an additional silicon source, and the prepared composite molecular sieve is applied to the alkylation reaction of phenol and tertiary butanol. The method comprises the following steps of: adding a certain amount of sodium silicate into the kaolin serving as the raw material to synthesize a Y type molecular sieve precursor; and preparing a composite molecular sieve Y/MCM-41 by the microwave method by using hexadecyl trimethyl ammonium bromide serving as a template. The synthesized molecular sieve has two pore structures, namely micropores and mesopores; the specific surface area of a sample is more than 550 m<2>/g; the average pore size is roughly 2.7 nm; and the sample has a regular and ordered hexagonal pore structure. The synthesized molecular sieve has good catalytic effect on the alkylation reaction of the phenol and the tertiary butanol, and particularly the selectivity of 4-tertiary butyl phenol is up to 86.3 percent.

The invention discloses an isothermal forging method of a straight bevel gear. A blank and a mold are heated to roughly consistent temperatures respectively, then the blank is placed into the mold and is subjected to forging molding in the mold at the relatively low strain rate, and the straight bevel gear is obtained through aftertreatment, wherein the relatively low strain rate is lower than 0.1 mm/s, and the mold adopts a closed mold forging structure. According to the method, firstly, the blank and the mold are heated to the equal temperature or basically equal temperatures, so that the chilling effect produced when the temperature of the mold is lower than that of the blank is avoided, and the plastic flow of the blank is improved; secondly, the mold adopts the closed mold forging structure, the blank bears three-dimensional compressive stress in the forging process, and thus molding of the blank is facilitated; thirdly, the strain rate is lower than 0.1 mm/s, accordingly, the deformation amount of the blank in unit time is small, deformation is sufficient, and molding of the blank is more facilitated.

The invention relates to a roof board, and particularly relates to a metal roof board system belonging to the field of steel structures. The metal roof board system comprises a purline and at least two metal roof boards, wherein the upper part of the purline is uniformly provided with fixing seats; both ends of each metal roof board are distributed upwards; the end part at the left end of each metal roof board is provided with a small flanged edge; the end part at the right end of each metal roof board is provided with a big flanged edge; and the head of each fixing seat is wrapped by the small flanged edge of one metal roof board, and the small flanged edge is wrapped by the big flanged edge of the other metal roof board. The metal roof board system has the advantages of simple structure, reliable performance, high support performance and good water resistance.

The invention relates to cooling and curing equipment, in particular to a steel band condensation and granulation unit. The steel band condensation and granulation unit comprises a combined rack, a steel band transmission drum, a steel band transmission reduction gearbox, a steel band passive drum, a steel band tension automatic adjustment mechanism, a steel band bracket, a steel band idling wheel, a transmission steel band, a water collection tank, a cooling spray pipe, an atomizing spray head, an unloading scraper, a feed opening, a distributor, a water inlet pipe, a drainage hole and a dust-proof housing, wherein a molten material with smelting point of 50-300 DEG C is uniformly distributed on the transmission steel band through the distributor; under forcible cooling of the water collection tank, the cooling spray pipe and the atomizing spray head arranged on the lower side of the transmission steel band, the material is quickly cooled and cured in the movement and conveying processes under the condition that the steel band is not in contact with water; the pelletized product prepared by the equipment has attractive appearance, is uniform, and is close to a half ball shape; particles have no thermal stress and are easier to package, transport and store.

The invention discloses a carbon substrate surface TaC coating layer and a preparation method thereof. The carbon substrate surface TaC coating layer comprises TaC generated by in-situ reaction of a hybrid complex of Ta and C and carbon of a carbon substrate, and TaC generated by decomposition of the hybrid complex of Ta and C. The preparation method comprises the following steps of (1) synthesizing a TaC precursor; (2) preparing TaC precursor paste; and (3) performing high-temperature segmented thermal processing. The carbon substrate surface TaC coating layer has the advantages of high bonding strength with the substrate, high crystallinity, uniformity, compactness, corrosion resistance, remarkable thermal stability and the like. The preparation method is simple in requirement on a process device, short in period and low in cost and has wide adaptability.

The invention discloses a graphite material with a SiC doped layer and a preparation method of the graphite material. The preparation method of the graphite material with the SiC doped layer comprises the following step: by taking mixed powder of silicon-containing powder and boron nitride as a silicon source, performing liquid-phase siliconing sintering on a graphite material, thereby obtaining the graphite material with the SiC doped layer. The graphite material with the SiC doped layer prepared by using the method comprises a graphite substrate and the SiC doped layer on the surface of the graphite substrate, the SiC doped layer is well combined with the graphite substrate without thermal mismatch, the graphite material is good in oxidation and corrosion resistance and relatively low in cost, and a small amount of silicon is adhered to the surface of the graphite material.

The invention provides an integrated platform supporting hinge, which comprises an integrated connecting rod, a magnetometer, an attitude measuring instrument, a Y-shaped supporting flexible hinge, asupporting platform and an I-shaped supporting flexible hinge. The magnetometer and the attitude measuring instrument are arranged at two ends of the integrated connecting rod respectively; and the integrated connecting rod is connected to the supporting platform in a supporting mode through the Y-shaped supporting flexible hinge and the I-shaped supporting flexible hinge. Through thermodynamic decoupling of the Y-shaped supporting flexible hinge and the I-shaped supporting flexible hinge in two dimensions and high rigidity in the vertical direction, no-thermal stress support of the Y-shaped supporting flexible hinge and the I-shaped supporting flexible hinge and constancy of the positions of key components of the magnetometer are realized, thereby facilitating scientific tests and applications in satellite fields such as space magnetic field and gravitational field detection. The integrated platform supporting hinge has the advantages of no thermal stress support, constant key component pose, stable platform configuration, high support rigidity, reliable performance and simple structure and the like.

The invention relates to a safe early warning beam structure for a longitudinal-beam-free middle bearing type arch bridge and an early warning method of the structure. A structure of the longitudinal-beam-free middle bearing type arch bridge does not adopt a longitudinal main beam, and when a hanging rod of the arch bridge fractures, beam falling accidents can be caused. The safe early warning beam structure comprises a continuous longitudinal beam consisting of a middle spanning connecting beam, a middle spanning support beam, a side spanning connecting beam and a side spanning support beam, wherein the continuous longitudinal beam extends to a cross beam between ribs, the middle spanning support beam forms a bag hanger on the hanging rod cross beam through the cross beam support beam and the connecting hanging rod, the top surface of the middle spanning connecting beam is provided with a longitudinal semitransparent communicating pipe, the inside of the middle spanning connecting beam is filled with low-volatility lubricating oil, the liquid level height differences of lubricating oil at the two ends of the communicating pipe are observed by the semitransparent communicating pipe, and the monitoring on the deformation of the middle spanning connecting beam is realized. The structure and the method have the advantages that the longitudinal beam basically bears no load in the operation stage, when small probability events such as hanging rod fracture occur, the longitudinal beam starts to take effects, the occurrence of the beam falling accidents is prevented, through the adopted communicating pipe, the deformation condition of the longitudinal beam can be observed, and the feasibility of monitoring the hanging rod safety on the basis of longitudinal beam deformation is improved.

The invention provides a thin film strainometer and a preparation method thereof. The preparation method comprises the following steps: carrying out surface treatment on an alloy substrate; depositing a NiCrAlY transit layer on the alloy substrate; preparing an Al2O3 coupling layer; arranging an Al2O3 ceramic insulating layer; arranging a thin film strainometer function layer, arranging a thermal oxidation Al2O3 protective layer and finally arrange an Al2O3 ceramic protective layer. According to the thin film strainometer and the preparation method thereof, NiCrAlY alloy is adopted as a function layer, and the Al2O3 protective layer formed on the surface of the NiCrAlY alloy through aluminum separation and oxidation is more dense and stable, so that good protection of the thin film strainometer function layer is achieved; the function layer and the transit layer both adopts the same NiCrAlY alloy material and treatment technique, have the same thermal expansion coefficient and are not likely to fall off under high temperature work environment; the temperature strain does not occur, and the service life of the thin film strainometer is prolonged.

The invention discloses a lightweight power battery box capable of steel and aluminum riveting. The lightweight power battery box comprises an inner container assembly and a bracket assembly, whereinthe inner container assembly is fixedly connected with the bracket assembly in lock riveting and adhesive bonding manners; the inner container assembly comprises a protective shell and an H-shaped installation cross beam, and the installation cross beam is connected to the interior of the protective shell by additionally installing a thread lock through a riveting technology; the bracket assemblycomprises a bottom shell hemming, and a plurality of lifting lugs bent by a metal plate or formed by stamping are arranged on the outer side face of the bottom shell hemming at intervals. The productcan realize batch production, the riveting assembling materials can be produced in parallel, the production process is short, and the efficiency is high. Most components of the product are made of aluminum alloy, and the final product can realize light weight. The lock riveting process is controllable in quality, the protective shell is free of damage, and the water prevention and dust preventionperformances are excellent. The assembling process is free of heat input, and the product is basically free of deformation. The aluminum alloy has excellent corrosion resistance, and does not need extra surface treatment, so that the environment is protected, and the aluminum alloy is also saved.

Provided are a semiconductor element module which is excellent in terms of thermal connection and electric connection, the cooling performance of which can be fully secured, and which is highly reliable, and a method for manufacturing the same. The semiconductor element module comprises an IGBT (2) and a diode (3) on both surfaces of which an electrode is formed, a ceramic substrate (7) on the surface of which wiring circuit layers (4, 5) which are bonded to one surface of the IGBT (2) and the diode (3) are formed and the thermal conductivity of which is high, a ceramic substrate (8) on the surface of which a wiring circuit layer (6) which is bonded to the other surfaces of the IGBT (2) and the diode (3) is formed and the thermal conductivity of which is high, and a sealing member (11) which is sandwiched between the outer edges of the ceramic substrates (7, 8) and with which the inside is sealed. These members are bonded by an ordinary temperature bonding method.

The invention relates to a selective laser sintering method for preparing zero-expansion/shrinkage-rate metal parts. The method comprises calculation of multi-phase alloy components, mixing of metal powder and organic adhesive powder, digital-analog slice layering treatment of formed parts, molding of porous blanks through selective laser sintering, debonding treatment of the porous blanks, melting of Sn-Bi alloys and infiltration in the blanks, and obtaining of final formed parts through after-treatment. After two structures with zero expansion rate and zero shrinkage rate are mixed, the metal parts with zero expansion rate and zero shrinkage rate can be obtained by an added material manufacturing forming technology and a diffusion metalizing method. The preparation method has advantages such as convenient operation, reliable performance, low comprehensive cost, light weight of the metal formed parts, smooth surface and capability of satisfying the use requirements and prolonging the service life, and can be widely popularized and applied.

The invention relates to the technical field of high-entropy alloy additive manufacturing, and particularly discloses a high-entropy alloy additive manufacturing device and additive manufacturing method. The high-entropy alloy additive manufacturing device comprises a welding wire clamp used for fixing two welding wires, an alternating-current power source and two wire feeders. The two welding wires are located on the same plane, axes of the two welding wires are crossed, the alternating-current power source is provided with two output ends, the two output ends are connected with a conductivenozzle of one welding wire, the two wire feeders are connected with one welding wire, are located on the ends, close to the conductive nozzle, of the welding wires, and are used for enabling the welding wires to be axially fed, the traditional high-entropy alloy additive manufacturing mode is changed, the high-entropy alloy of the complex structure can be manufactured, in the preparing process, the alternating-current double-wire indirect electric arc welding is used, heat transfer and medium transfer decoupling control is achieved, heat input is controlled within a certain range while the deposition rate is improved, and the device is more efficient and energy-saving.

The invention relates to a turbine (6), especially a gas turbine. According to the invention, a sealing element (44) with a receiving area (50) is provided for sealing the guide blades (18) which are adjacent to each other in the peripheral direction (36) of the turbine (6). The foot plates (21) of the guide blades (18) extend into said receiving area. The edge area of the foot plates (21) does not have to be reinforced compared to a conventional seal, which enables the entire foot plate to be cooled homogeneously. A closed cooling system (62) can therefore be used for cooling, especially with steam.

The invention belongs to the technical field of ceramic joining and discloses a method for joining a nano-impregnated transient eutectic phase with SiC ceramic. The method comprises the following steps: taking mixed powder A of SiC powder and Al2O3-MxOy as a joining material, wherein MxOy is Ho2O3 or CeO2; adding a solvent and a ball milling medium into the mixed powder A for mixing and drying, then spreading powder obtained by granulating obtained mixed powder B between two pieces of polished SiC to form a sandwich structure; then carrying out isostatic cool pressing treatment, and pressurizing to 0.01 to 0.1MPa in a vacuum or atmosphere protection; raising the temperature to 600 to 1000 DEG C and insulating I; raising the temperature again to 1450 to 1600 DEG C and insulating II at the pressure of 200 to 500 MPa, and joining to obtain the nano-impregnated transient eutectic phase joined SiC ceramic. The method disclosed by the invention realizes low-temperature and low-pressure joining of the SiC ceramic, and the leak rate of the joining part reaches 0 to 1*10<-8> Pa.L/s.

The invention discloses an additive manufacturing device and method based on meniscus constrained electrodeposition, and belongs to the technical field of additive manufacturing. The additive manufacturing device comprises a vibration isolation module, an additive manufacturing motion platform, a precision positioning module, a monitoring module and an electrode module. By utilizing a meniscus constrained electrodeposition technology, electrodeposition is carried out in a liquid meniscus between the tip of a transfer pipette and a conductive substrate, a liquid bridge extends in multiple directions under movement of a movable sliding table, the relative positions of the substrate and the transfer pipette are compensated through precise cooperation movement of a six-axis PI motion console and the movable sliding table, the stable liquid bridge is continuously kept between the substrate and the transfer pipette, and therefore a complex uniform deposition structure with high quality, high compactness and high surface smoothness is formed. Forward micro-additive manufacturing of the submicron glass transfer pipette is achieved in a real sense, mechanical micro-motion and a microfluid technology are integrated through a localized electrochemical technology, and the whole deposition process is more stable and has higher ductility.

The invention provides a method and device for packaging flexible OLED screens through laser welding. The method comprises the steps that laser beams emitted by a laser device are transmitted to a 3D dynamic focusing vibration lens, and through high-speed scanning of the 3D dynamic focusing vibration lens, the laser beams penetrate through upper layer light-transmitting materials of the flexible OLED screens and reach lower layer light absorbing materials of the flexible OLED screens; and through a set packaging track, contact faces of upper layer packaging materials and lower layer packaging materials of the flexible OLED screens are fused. The process is simple, the consistency is good, and automatic production can be achieved easily.

The invention relates to a fractal channel printed circuit heat exchanger. The printed circuit heat exchanger (PCHE) is provided with heat exchange fluid channels of three-dimensional layer-by-layer diffusion type fractal tree-shaped channel networks through distributors and collectors which are arranged in inlet and outlet sealing heads, the heat exchange fluid channels are connected with inletsand outlets of the fractal tree-shaped heat exchange fluid channels on each heat exchanging plate constituting a heat exchanger core body in a matched mode, and cold and hot fluid experiences bionic complex flow and heat exchange processes such as multi-scale flow from large size main channel to micro-scale branch tail end channel in the heat exchanger core body, convective heat exchange with theheat exchanging plates and heat exchange in the heat exchanging plates; the characteristics of a heat exchange medium of low flow resistance, high heat exchange efficiency and no thermal stress in theheat exchanging plates are realized by producing coordinated equilibrium and stable velocity distribution, temperature distribution and uniform temperature distribution in the heat exchanging plates;and moreover, a bifurcation structure can effectively eliminate fluctuating vibration of flow pressure caused by driving force and inhibit a circulating cavitation phenomenon of liquid.

The invention discloses an intelligent ice-melting and water-draining module for an air cylinder of a commercial vehicle. The ice-melting and water-draining module is rapid and timely in ice-melting and water-draining The intelligent ice melting and water draining module comprises a valve body (2), an electromagnet assembly (1) and a controller assembly (3), a water cavity (25) communicating with a water draining pipe (24) is formed in the valve body (2), and the electromagnet assembly (1) controls connection and disconnection of the water draining pipe (24) and the water cavity (25); the intelligent ice melting and water draining module further comprises a thermal resistance type heating film assembly (8) which is tightly attached to the outer wall of the valve body (2) and electrically connected with the controller assembly (3), and the thermal resistance type heating film assembly (8) comprises a heating film (81), a heating film gasket (82), a fixing screw (83), gum (84) and a heating film pressing plate (85); and the heating film (81) is pasted on the outer wall of the valve body (2) through gum (84), and the heating film pressing plate (85) fixes the heating film (81) on the outer wall of the valve body (2) in an attached mode through the fixing screw (83) and the heating film gasket (82).