703results about How to "Reduce cracking" patented technology

The embodiment of the invention relates to the field of photovoltaic technology, and provides a photovoltaic module, the photovoltaic module comprises a battery string, an insulating layer, a bus bar and a conductive bridging part, the battery string comprises a plurality of battery pieces, the back surface of each battery piece is provided with a welding strip, and the plurality of battery pieces are connected in series through the welding strips; the insulating layer is arranged on one side, far away from the battery piece, of the welding strip, and the insulating layer is provided with an avoiding area, so that part of the welding strip is exposed from the avoiding area to form a welding strip exposing part; the bus bar is arranged on one side of the insulating layer away from the solder strip; the conductive bridging part is arranged between the bus bar and the solder strip exposing part, so that the bus bar and the solder strip exposing part are conductively connected through the conductive bridging part. The embodiment of the invention is at least beneficial to improving the maximum output power of the back contact battery assembly.

The invention relates to the field of solidified soil, and particularly discloses solid-waste-based premixed flow-state solidified soil and a preparation method thereof. The solid-waste-based premixed flow-state solidified soil comprises soil, water and a curing agent according to the weight ratio of (28-36): (50-54): (6-9), according to the total weight of the curing agent, the curing agent comprises the following components in parts by weight: 20-40 parts of fly ash, 30-47 parts of slag, 6-18 parts of silica fume, 10-15 parts of sea sludge, 1-3 parts of a water reducing agent, 1-3 parts of sodium hydroxide, 1-3 parts of calcium sulphoaluminate, 3-10 parts of a fiber reinforced material and 1-3 parts of phosphate. The problems that stress generated by the solidified soil in the hydration process is excessively concentrated and shrinkage is excessive can be solved, and therefore cracking of the solidified soil subjected to premixed flow state solidification is reduced.

The invention relates to the technical field of electronic ceramic materials, and particularly discloses a high-purity aluminum oxide ceramic substrate and a preparation process thereof. The high-purity aluminum oxide ceramic substrate is prepared from the following raw materials in parts by weight: 0.20 to 0.25 part of magnesium oxide, 0.35 to 0.55 part of zirconium oxide, 1.2 to 1.5 parts of dispersing agent, 60 to 65 parts of ethanol, 99.7 to 99.8 parts of aluminum oxide, 12 to 15 parts of adhesive, 6 to 9 parts of plasticizer and 50 to 55 parts of n-butyl alcohol, the adhesive is a mixture of polyvinyl butyral, water glass and modified paraffin. The prepared high-purity aluminum oxide ceramic substrate has excellent chemical stability and mechanical strength, and the obtained aluminum oxide ceramic substrate has better density, mechanical property and thermal stability by mixing various raw material components, and is not easy to break when subjected to bending load.

The invention provides a skateboard body, a skateboard and a manufacturing method of the skateboard. The sliding plate body comprises an inner plate, a structure strengthening embedded pipe, a structure strengthening piece and a gluing part, the inner plate is provided with an embedded area, the structure strengthening embedded pipe is arranged in the embedded area, the structure strengthening piece is attached to the inner plate, the gluing part is filled in the embedded area, and the gluing part is connected with the structure strengthening embedded pipe and the structure strengthening piece. According to the sliding plate body, the structure strengthening embedded pipe is arranged in the embedded area of the inner plate, the bearing strength and the bending resistance of the sliding plate body are improved, the gluing part is connected with the structure strengthening embedded pipe and the structure strengthening piece, and the structural strength of the sliding plate body is improved.

The invention discloses a preparation method of a high-uniformity titanium alloy bar, which comprises the following steps of: performing reversing upsetting and drawing on a round billet or a near-round billet, controlling the rotation times of drawing in the reversing upsetting and drawing, performing spheroidization in combination with dynamic recrystallization, and returning to the original temperature after forging to enable an alpha phase to be further subjected to static recrystallization, thereby obtaining the high-uniformity titanium alloy bar. Meanwhile, the beta phase is recovered to form a subcrystal structure, and the beta phase and the alpha phase are further subjected to static recrystallization to be refined by heating to T beta-(10-30) DEG C. The problems of cracking and non-uniform deformation caused by reversing upsetting in the prior art can be remarkably improved, and the cracking degree of the blank is remarkably relieved while the structure uniformity is improved.

The embodiment of the invention relates to the field of photovoltaic technology, and provides a photovoltaic module, the photovoltaic module comprises a battery string, an insulating layer and a bus bar, the battery string comprises a plurality of battery pieces, the back surface of each battery piece is provided with a welding strip, and the plurality of battery pieces are connected in series through the welding strips; the insulating layer is arranged on one side, far away from the battery piece, of the welding strip, and the insulating layer is provided with an avoiding area, so that part of the welding strip is exposed from the avoiding area to form a welding strip exposed part; the bus bar is arranged on the side, away from the welding strip, of the insulating layer, the bus bar is provided with an abutting part in a protruding mode towards the welding strip exposing part, and the abutting part abuts against the welding strip exposing part so that the bus bar can be conductively connected with the welding strip. The embodiment of the invention is at least beneficial to improving the maximum output power of the back contact battery assembly.

The invention relates to the technical field of glass bottle defect detection, and particularly discloses glass wine bottle body defect optical detection equipment and detection method.The optical detection equipment comprises a conveying belt, and a clamping mechanism, a lifting rotating mechanism, a detection mechanism and a sorting mechanism are sequentially arranged on the conveying belt from the feeding end to the discharging end. The detection end of the detection mechanism is attached to the bottle body of the glass wine bottle for optical detection, the receiving end of the detection mechanism receives the light in the glass wine bottle, the light directly reaches the receiving end in the bottle after passing through a bottle body material, and a signal path is relatively fixed, so that the interference of ambient light or reflection of surrounding objects on an optical signal can be effectively reduced. The bottle body of the glass bottle has a certain thickness, deviation of light scattering and refraction is easy to occur when light passes through the thickness of the glass in traditional external detection, the error can be reduced by matching of an external detection end and an internal receiving end, fine defects such as bubbles, cracks or tiny scratches are helped to be captured, and the detection stability is improved.

The invention discloses lanthanum-cerium mixed rare earth corrosion-resistant twisted steel with yield strength of 400MPa. The lanthanum-cerium mixed rare earth corrosion-resistant twisted steel comprises the following elements: 0.10 to 0.20 percent of C, 0.25 to 0.80 percent of Si, 0.90 to 1.60 percent of Mn, 0.020 to 0.045 percent of V, 0.003 to 0.010 percent of Ti, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, 0.25 to 0.65 percent of Ni, 0.25 to 0.70 percent of Cr, 0.10 to 0.18 percent of RE, less than or equal to 0.20 percent of Cu, less than or equal to 0.004 percent of O, less than or equal to 0.006 percent of N and the balance of Fe and inevitable impurities. The invention further discloses a production method of the lanthanum-cerium mixed rare earth corrosion-resistant twisted steel with the yield strength being 400 MPa. The production method comprises the working procedures of converter smelting, argon blowing refining, LF furnace refining, continuous casting and rolling, and the lanthanum-cerium mixed rare earth reinforced alloy cored wire and the silicon-calcium wire are fed into molten steel in the argon blowing refining process. The components, inclusions and mechanical properties of the produced 400 MPa-grade lanthanum-cerium mixed rare earth steel bar completely meet the technical requirements of the steel bar, the quality control requirement is met, and the 400 MPa-grade lanthanum-cerium mixed rare earth steel bar has the advantages of being high in strength, high in plasticity, resistant to corrosion and the like. The service life of the steel is prolonged, coating and galvanization are avoided, the burden of environmental protection is relieved, and reasonable application of resources is facilitated.

The invention belongs to the technical field of chip processing, and discloses a wafer laser cutting device based on chip processing, which comprises a vibration mechanism, the vibration mechanism comprises four sliding blocks, the interiors of the sliding blocks are fixedly connected with first motors, and the first motors are rotatably connected with cams; through cooperation of the cam, the clamping plates and other structures, the laser cutting effect of the wafer is improved, the first motor is started to enable the wafer clamped among the four clamping plates to generate slight vibration in the vertical direction, the slight vibration promotes micro movement of a material in the laser cutting process, better interaction between a laser beam and the material is facilitated, and the laser cutting efficiency is improved. A more uniform and smoother cutting face is achieved, the vibration effect can accelerate the melting or crushing process of materials, the cutting time is shortened, the cutting efficiency is improved, meanwhile, vibration can accelerate airflow on the surface of a wafer, a certain heat dissipation effect is achieved, local overheating of the materials is reduced, expansion of a heat affected zone is avoided, and the flatness of the cutting edge is improved.

The embodiment of the invention relates to the technical field of photovoltaic, and provides a manufacturing method of a photovoltaic module, which is at least beneficial to improving the reliability of the photovoltaic module. The manufacturing method comprises the steps that a first adhesive film layer and a second adhesive film layer are laid on a first cover plate, the first adhesive film layer covers the surface of the first cover plate, the second adhesive film layer is located on the first adhesive film layer, the second adhesive film layer is provided with a plurality of hollowed-out parts arranged in the first direction, and the hollowed-out parts and the first adhesive film layer define a containing groove; the thickness of the first adhesive film layer is greater than that of the second adhesive film layer; battery pieces are laid, the multiple battery pieces are in one-to-one correspondence with the containing grooves, and the adjacent battery pieces are sequentially connected through interconnection parts; laying a third adhesive film layer and a second cover plate on the battery piece to form a to-be-laminated piece; and laminating the to-be-laminated piece.

The invention relates to the technical field of concrete preparation, in particular to moisturizing anti-cracking high-ductility concrete and a preparation method thereof. The moisturizing anti-cracking high-ductility concrete is prepared from the following components: 350 to 450 parts of ordinary Portland cement, 200 to 300 parts of fly ash, 30 to 50 parts of silica fume, 250 to 350 parts of quartz sand, 0.5 to 1 part of a water reducing agent, 10 to 20 parts of an expanding agent, 0.1 to 0.3 part of a retarder, 0.5 to 1 part of a thixotropic lubricant, 0.2 to 0.7 part of a modified nano material, 0.7 to 3 parts of a modified composite curing agent, 5 to 10 parts of an anti-cracking agent, 5 to 12 parts of polymer fiber and 180 to 220 parts of water. The high-moisture-retention high-water-retention concrete has the characteristics of high moisture retention and high water retention, is beneficial to maintaining the internal humidity balance, reducing cracks generated by drying shrinkage, improving the durability of the concrete, and remarkably reducing the cracking risk of the concrete in the hardening process, so that the concrete structure is more complete, the safety of the structure is improved, and the service life of the structure is prolonged.

The invention provides a temperature control method for a mass concrete structure, and relates to the technical field of concrete pouring construction, and the method comprises the following steps: carrying out the regional division of the mass concrete structure, and obtaining a first data set and a second data set of each to-be-detected region in real time; the first data set comprises the concrete temperature and the concrete temperature change rate of the mass concrete structure, and the second data set comprises the cooling water temperature and the cooling water flow of the cooling water; based on the first data set and the second data set, a structural performance parameter set of the mass concrete structure at the moment is obtained, and the structural performance parameter set comprises structural stress, strain, a safety index and a stability index; and according to the structural performance parameter set, generating corresponding cooling water target temperature, cooling water target flow and target cooling duration for adjusting the circulation process of the cooling water so as to control the temperature of the mass concrete structure. According to the scheme, the temperature control accuracy in the mass concrete cooling process is guaranteed, and the situation of concrete cracking is reduced.

The invention belongs to the technical field of welding, and discloses a dissimilar metal power modulation galvanometer laser welding method which comprises the following steps: finely cleaning a 6061 aluminum alloy and a 304 stainless steel plate by using acetone, and then airing for more than 20 minutes; the aluminum steel sheet is assembled, pressed and fixed on a welding test platform in a steel-up-aluminum-down mode; the position of the welding test platform is adjusted, argon serves as welding protection gas, and a protection gas nozzle is arranged to be aligned with a welding pool area; laser welding parameters are set, a laser power modulation mode is set to be a gradient power mode, and the gradient power mode is to regulate and control phase point laser power in a circular scanning track in the advancing direction of a welding seam; a welding test is carried out in the mode that a galvanometer laser head is fixed and a welding test platform is moved, and a laser and the welding test platform are synchronously started and stopped; and the protective gas is started 5 seconds before the laser is started, and after the laser is stopped, the protective gas is stopped lagging for 10 seconds so as to continuously protect the welding seam and prevent oxidation.

The invention relates to the technical field of batteries, in particular to a porous carbon material, a silicon-carbon composite material and application of the porous carbon material and the silicon-carbon composite material. According to the porous carbon material, the micropore rate phi, the pore volume Pv and the compressive strength Cs meet the relational expression that (Cs * phi) / Pv is larger than or equal to 550 and smaller than or equal to 1050, and the micropore rate phi gt; and the compressive strength Cs is 600 to 850 MPa. The porous carbon material provided by the invention has high microporosity, and the microporosity phi, the pore volume Pv and the compressive strength Cs of the porous carbon material meet the relation that (Cs.phi) / Pv is more than or equal to 550 and less than or equal to 1050, so that the particle size of silicon particles can be effectively reduced, the absolute expansion of silicon in a carbon matrix is reduced, and the first effect and the cycling stability of the silicon-carbon composite material are improved.

The invention relates to the technical field of asphalt concrete, and discloses an anti-crack asphalt concrete material and a preparation method thereof. According to the asphalt concrete material disclosed by the invention, by adding the reinforcing filler and the composite aerogel, the crack resistance, the service life and the ultraviolet aging resistance of a matrix are remarkably improved; wherein the reinforcing filler is based on the synergistic effect among modified lignin, diatomite and hydrotalcite, the compatibility among modified lignin, diatomite and hydrotalcite is improved by utilizing a silane coupling agent, and the dispersity of the reinforcing filler in a matrix is improved, so that the crack resistance of the matrix is improved, the service life of the matrix is prolonged, and the ultraviolet resistance of the matrix is improved; the composite aerogel has excellent heat insulation performance and a three-dimensional network structure, and the crack resistance of the matrix can be improved through the synergistic effect.

The invention discloses a preparation method of a light high-strength hollow SiO2 aerogel composite board, which comprises the following steps: uniformly mixing tetramethyl orthosilicate and methanol, adjusting the pH value to be acidic, adding a mixed solution of ammonium fluoride and water, uniformly stirring, and hydrolyzing to obtain silica sol; the preparation method comprises the following steps: putting a water-soluble powder modifier into silica sol, and dispersing under ultrasonic waves to form a stable suspension; putting the suspension into a mold, adding a catalyst, uniformly stirring, and standing for reaction to obtain wet gel; putting the wet gel into a mixed solution of water and methanol, dissolving the powder modifier in the wet gel by using ultrasonic waves, and repeatedly replacing a soaking solution until the powder modifier in the wet gel is completely dissolved; and after the wet gel becomes transparent, aging and drying the wet gel in sequence to prepare the lightweight high-strength hollow SiO2 aerogel composite board. According to the invention, the one-time forming qualification rate of large-size aerogel products is improved; a large-size hollow structure in the prepared hollow SiO2 aerogel composite board has a relatively strong energy absorption effect, and the hollow SiO2 aerogel composite board is high in strength, light in weight and simple to manufacture.

The invention relates to the technical field of alloy processing, in particular to a long-service-life elastic titanium-copper alloy for a VCM elastic piece and a preparation method thereof.The preparation method comprises the following steps that firstly, raw materials including 55%-65% of titanium, 30%-25% of copper, 10%-8% of aluminum, 3%-1% of zinc and 2%-1% of magnesium are weighed according to the mass percent; 2, the raw materials are put into a vacuum furnace to be melted, and a liquid melt is obtained; thirdly, the melt is poured into a casting mold for casting, and a blank is obtained; according to the method, the change of the state of the blank can be responded in real time by calculating the influence of the rolling times and the thickness change of the blank on the rolling control parameters, so that the rolling process can be flexibly adjusted according to the actual situation, the adaptability during machining is improved, and the rolling speed is improved when the rolling times are gradually reduced along with the reduction of the rolling times of the blank. The rolling temperature, ratio, speed and pressure are reduced, excessive deformation and damage of blanks can be effectively prevented, and the quality of final products, namely the elastic life of the alloy, is improved.

The invention provides a titanium alloy surface antifouling corrosion-resistant coating as well as a preparation method and application thereof. The antifouling and corrosion-resistant coating on the titanium alloy surface is prepared from raw materials including titanium-based composite powder, the titanium-based composite powder comprises titanium alloy powder and copper powder, the content of the titanium alloy powder in the titanium-based composite powder is 93 wt%-97 wt%, and the content of the copper powder in the titanium-based composite powder is 3 wt%-7 wt%. Through introduction of the copper element, the phase composition and microstructure of the alloy can be changed, formation of a beta phase is promoted, the ratio of an alpha phase to the beta phase is changed, the compactness and uniformity of a coating are effectively improved, and the corrosion resistance of the surface of the titanium alloy is remarkably improved. The invention further provides a preparation method and application of the antifouling and corrosion-resistant coating on the titanium alloy surface.

The invention provides a capillary crystalline waterproof agent, a preparation method and application, and the capillary crystalline waterproof agent comprises the following raw materials in parts by weight: 80-100 parts of a non-cement-based cementing material, 15-25 parts of an alkali activator, 1.5-2.5 parts of a thickener, 12.5-22.5 parts of a flexibilizer, 0.1-0.3 part of a dispersant and 5-10 parts of a water reducer, the flexibilizer is formed by mixing carboxyl-terminated liquid rubber modified epoxy resin and inorganic ceramic particles according to the mass ratio of 7: (3-5), and the dispersing agent is alkylphenol polyoxyethylene ether. Under the action of the dispersing agent, the toughening agent can be uniformly dispersed in the concrete, so that the overall toughness of the concrete is improved. The improvement of the overall toughness not only can bear deformation or shrinkage cracking of the concrete caused by evaporation of moisture, temperature difference and external stress, but also can better resist cracking from the source, reduce cracks and pores, prevent moisture from permeating and improve the impermeability of the concrete; and the bending resistance of the concrete after complete water permeability and self-healing can also be improved.

The invention relates to the technical field of TPE particle processing, and discloses automatic material taking and transferring equipment for TPE particle processing, which comprises a mechanical claw, the outer wall of the mechanical claw is rotatably connected with a rotating frame, the bottom of the rotating frame is fixedly connected with a fixed plate, the bottom of the fixed plate is provided with a shaking mechanism, and the bottom of the shaking mechanism is rotatably connected with a top plate. A stable grabbing assembly used for stably grabbing bagged TPE particles is arranged in the top plate, and a discharging assembly used for conducting side face cutting and discharging on the bagged TPE particles is arranged in the top plate. The multiple grabbing insertion rods are inserted into the bagged TPE particles through the sharp ends after rotating by 90 degrees, the weight of the bagged TPE particles can be more evenly shared, shaking and falling of the particles in the material taking process are reduced, and therefore the material taking stability is improved, the pressure on packaging bags is dispersed through the two-side insertion mode, and the packaging efficiency is improved. The risk that the packaging bag is broken or torn is reduced, and material leakage and waste can be reduced.

The invention discloses a CVD (chemical vapor deposition) coating applicable to a microporous wire-drawing die and a preparation method of the CVD coating, and relates to the technical field of CVD coatings. A composite coating is deposited in a microporous wire drawing die through a CVD method, and the composite coating is sequentially provided with TiN / Ti (C, N) / beta-SiC / aluminum oxide from inside to outside; wherein TiN is used as a coating in direct contact with a microporous wire-drawing die substrate, and the main purpose of TiN is to improve the bonding strength between the coating and the substrate and prevent the coating from falling off due to cracks generated by stress change caused by different thermal expansion coefficients between the substrate and the coating.

The invention discloses concrete with high salt corrosion resistance and a preparation method of the concrete. The concrete is prepared from 300-400 kg / m < 3 > of cement, 50-150 kg / m < 3 > of slag powder, 1000-1200 kg / m < 3 > of gravel, 650-800 kg / m < 3 > of machine-made sand, 0.5-2 kg / m < 3 > of a modified polycarboxylic acid water reducing agent, 0.005-0.01 kg / m < 3 > of an air entraining agent, 0.05-0.1 kg / m < 3 > of an ion chelating agent, 0.05-0.1 kg / m < 3 > of polyacrylamide, 0.01-0.05 kg / m < 3 > of sodium methyl silicate, 0.1-0.5 kg / m < 3 > of multiwalled carbon nanotube dispersion liquid and 140-160 kg / m < 3 > of water. The preparation method comprises the following steps: stirring and mixing the modified polycarboxylate superplasticizer, the air entraining agent, the ion chelating agent, the polyacrylamide, the sodium methyl silicate and part of the water for mixing to obtain an admixture mixed solution; sequentially putting broken stones, cement, machine-made sand, the admixture mixed solution, the multi-walled carbon nanotube dispersion liquid and the rest of mixing water into a stirrer, and stirring for 2-3 minutes, so as to obtain the concrete with high salt corrosion resistance. The concrete has high salt corrosion resistance in a complex service environment, the service life of a concrete structure is effectively prolonged, and a reliable guarantee is provided for infrastructure construction.

The invention relates to a self-repairing invisible car cover and a preparation method thereof, and relates to the technical field of automobile material processing, and the self-repairing invisible car cover comprises the following components in parts by mass: 20-40 parts of fluorine-containing polyol, 15-30 parts of polyisocyanate, 5-10 parts of a composite chain extender, 10-20 parts of self-repairing microcapsules, 1-3 parts of an initiator and 30-50 parts of a solvent. The preparation method comprises the following steps: preparing a self-repairing coating; coating the surface of the transparent substrate with an adhesive to obtain an adhesive layer, and covering the adhesive layer with a release film to obtain a semi-finished automobile cover; and the self-repairing coating is applied to the face, away from the release film, of the semi-finished automobile cover, heating and curing are conducted, the semi-finished automobile cover with a self-repairing coating is obtained, the self-repairing coating is coated with a protective film, and the self-repairing invisible automobile cover is obtained after curing. The automobile cover has the effect of improving the self-repairing performance of the automobile cover, and the automobile cover has good weather resistance, tensile resistance and puncture resistance.

The present invention relates to a weather-resistant and anti-aging polyethylene pipeline and a preparation method thereof, and belongs to the technical field of polymer materials. The pipeline adopts high-density polyethylene resin, linear low-density polyethylene resin, polyimide resin powder, nano silicon dioxide, nano hexagonal boron nitride, polybenzimidazole fiber, carnosic acid, zinc glycyrrhetinate, antioxidant 1010, hindered amine light stabilizer, polydimethylsiloxane titanate cross-linked polymer, 3-methacryloxypropyl triethoxysilane as raw materials; wherein, polyimide resin powder, carnosic acid and zinc glycyrrhetinate are uniformly mixed, and then modified at 300°C to 350°C for 30min to 60min to obtain a modified product, which can better improve the weather resistance and aging resistance of the pipeline. Each component is compatible with each other, and a special modified preparation method is adopted to better play the synergistic effect of the components, and greatly improve the weather resistance and aging resistance of the polyethylene pipeline.

The invention relates to a pseudo-classic building roof structure and a construction method thereof, and relates to the technical field of pseudo-classic building roofs, the pseudo-classic building roof structure comprises a main ridge, grey tiles and a reinforcing gauze element, the main ridge comprises a beam body and roof supporting frames, and the roof supporting frames are arranged on the two sides of the beam body; a cornice is arranged on the side, away from the beam body, of the roof supporting frame, a wall frame is arranged below the cornice, and an outer protection body is arranged on the edge of the wall frame. The gaps are reserved between the grey tiles through the reinforcing gauze element, then when thermal expansion and cold contraction occur between the concrete structure and the grey tiles due to the environment, the gaps reserved between the grey tiles can prevent the grey tiles from being extruded due to thermal expansion and cold contraction, and the reinforcing gauze element is structurally made of polyester fiber gridding cloth, so that the reinforcing gauze element is not prone to deformation. The concrete has good flexibility and weather resistance, the reinforcing gauze element enhances the structural strength of the concrete, and cracking or deformation of the concrete structure when the concrete structure is stressed is reduced.

The invention relates to the technical field of solar cells, in particular to a perovskite precursor solution, a perovskite solar cell and a preparation method of the perovskite solar cell. The perovskite precursor solution comprises a perovskite material, an additive and an organic solvent; wherein the additive comprises a compound containing pyrrolyl and carboxyl; the perovskite material is of an ABX3 structure, wherein A is a monovalent cation; b is a divalent cation including lead; and X is a monovalent anion. According to the application, the additive can be used for adjusting the film-forming crystallization process of perovskite, carboxyl of the additive and a perovskite material can form an intermediate, film-forming crystallization is delayed, the compactness and uniformity of a thin film are improved, and the film-forming quality is improved; in the large-area coating process, the solution fluidity is low, the time window is lengthened, and the film can grow uniformly; and the pyrrolyl has unsaturated nitrogen atoms, so that free Pb in the perovskite can be passivated, a passivation effect is achieved, and the performance of the device is improved.

The invention relates to the field of novel polymer materials, and particularly discloses a degradable expandable polylactic acid polymer foam material and a preparation method thereof, the degradable expandable polylactic acid polymer foam material comprises the following raw materials: a polylactic acid-starch-polyamide blending modified mixture, polylactic acid foam material waste leftover materials, a foaming agent, a nucleating agent and an activating agent; the preparation method comprises the following steps: melting and mixing polylactic acid, acylated starch and polyamide in proportion to prepare a polylactic acid-starch-polyamide blending modified mixture, weighing the polylactic acid-starch-polyamide blending modified mixture, mixing the polylactic acid-starch-polyamide blending modified mixture with the polylactic acid foaming material waste leftover materials, the foaming agent, the nucleating agent and the activating agent, and performing extrusion molding to obtain the polylactic acid foaming material. Extruding and pelletizing to obtain foaming master batch, and foaming and forming; the preparation method has the characteristics that the expandable performance of the polylactic acid material is improved, and the prepared polylactic acid foam material is more uniform in cell size distribution, small in cell size and excellent in mechanical property.

The invention relates to the technical field of semiconductor manufacturing, and discloses a cover plate assembly, a semiconductor processing chamber and semiconductor coating equipment, and the cover plate assembly comprises a cover plate which is provided with one or more observation holes in a penetrating manner along the thickness of the cover plate; the observation structure comprises a convex observation window arranged in the observation hole, and the first side face of the convex observation window is a protruding part and deviates from the semiconductor processing chamber. In this way, the heating capacity of the observation window can be effectively improved, and therefore the situations of cracks, fragmentation and the like of the observation window are reduced.

The invention discloses a short-long wave laser hybrid welding method for aluminum alloy, and belongs to the field of laser welding. The method comprises the following steps: firstly, treating the surface of the aluminum alloy by adopting short-wavelength laser as a pretreatment laser source to enable the surface of the aluminum alloy to be in a molten state; according to the method, aluminum is pre-melted, then long-wavelength laser is adopted for welding, due to the fact that the reflectivity of the aluminum to the infrared laser in the liquid state is remarkably reduced, the pre-melting step creates conditions for follow-up long-wavelength infrared laser welding, the absorption rate of the infrared laser is remarkably improved, and loss of laser energy is reduced; according to the process, the utilization rate of welding energy is optimized and the welding quality is improved by utilizing different heating effects of lasers with different wavelengths on the surface of the aluminum alloy.

The invention relates to a concrete crack control method during manufacturing of an immersed tube joint, which is characterized in that a pre-cast section and a post-cast strip of the immersed tube joint are cast in a full-section casting manner, so that the construction efficiency can be improved, and meanwhile, cracks caused by vertical layering are reduced; the crack control requirement is obtained by obtaining the stress influence of the waterproof bottom steel plate on the two poured adjacent pre-pouring sections, then control indexes of control parameters are determined according to the crack control requirement, full-section pouring process construction organization arrangement is conducted, then immersed tube joints are manufactured, and the construction quality of the immersed tube joints is improved. According to the mode, the restraining effect of the post-cast strip waterproof bottom steel plate on the two adjacent pre-cast sections can be considered, the better crack control effect can be achieved, the full-section interval pouring immersed tube section concrete crack control method is provided, the whole-section pouring technology of the supporting integral type immersed tube section is provided, high-quality prefabrication of the immersed tube section is guaranteed, and the construction efficiency is improved. And meanwhile, the immersed tube joint prefabricating efficiency is greatly improved.