83results about How to "Slow down the speed of solidification" patented technology

The invention belongs to the technical field of laser added material manufacturing, and relates to a method for preparing TiAl+Ti2AlNb composite materials by laser melting deposition. The laser melting deposition method is adopted to form the TiAl+Ti2AlNb composite materials; and the feeding quantity of Ti2AlNb is adjusted to achieve a pinning effect in composite material structures to improve overall plasticity of the materials. Meanwhile, circular samples are formed, and scanning paths are changed to concentric arcs to prevent the tensile stress of linear scanning paths of rectangular samples; and concentric circle openings on each layer are converted by 60-90 degrees, that is, the positions of scanning initial points on each layer are changed, so that the thermal stress concentration isreduced to prevent cracks. The heat input quantity in the forming process is controlled, and the substrate preheating temperature in the forming process is adjusted to slow down the formed metal solidification speed and cooling speed, so that the stress is released for a longer time.

A Ni-based alloy member has resistance against grain boundary fracture, fatigue strength, and oxidation resistance at temperatures near 1000° C. or higher. The Ni-based alloy member includes a non-repaired region made of a Ni-based alloy base and a region repaired by welding, which is formed on the non-repaired region and which is made of a buildup-welded layer, the buildup-welded layer being made of a Ni-based alloy containing, by weight, 15% or less of Co, 18-22% of Cr, 0.8-2.0% of Al, 5.0% or less of Ta, 0.5% or less of Mo, 0.5% or less of Ti, 13-18% of W, 0.05-0.13% of C, 0.06% or less of Zr, 0.015% or less of B, 0.4-1.2% of Mn, and 0.1-0.3% of Si, the balance of the alloy being preferably essentially made of Ni.

A process for preparing the permanent-magnet AlNiCo alloy with equiaxed crystals includes such steps as proportionally mixing Al, Ni, Co, Cu, Ti, NbFe (1: 1), Fe, Si, FeS and SmCo, charging the mixture in furnace, preparing casting mould, vacuumizing, electric heating, filling Ar gas, casting, annealing, two-stage preheating, solution treating, magnetic field controlled cooling and three-stage tempering.

The invention discloses an exiting device for laser hybrid welding. The exiting device for laser hybrid welding comprises a laser welding head, a semiconductor laser device and an optical fiber laser device, wherein the semiconductor laser device and the optical fiber laser device are respectively connected with the laser welding head; the semiconductor laser device transmits semiconductor laser; the optical fiber laser device transmits optical fiber laser; a light path of the laser welding head comprises a semiconductor light path, an optical fiber light path and a coaxial monitoring light path; a laser light beam of the semiconductor light path and a laser light beam of the optical fiber light path are superposed into a light beam for welding at a focus point of the laser welding head; a welding position is illuminated through an external light source; and light reflected by the welding position is displayed by a monitor after the welding position is imaged a coaxial monitoring light path. The technical problems that traditional welding pores are abundant, hot crack tendency is high, welding spatter is severe, welding joints are large and the like are solved. The exiting device for laser hybrid welding has the characteristics that energy utilization rate is increased, key holes are stable, the device is suitable for high-speed welding, solidification speed is reduced, the pores are also reduced, hot crack tendency is decreased, welding spatter is reduced, forming of welding joints is improved, so that a welding surface is smooth and the like.

The invention relates to the technical field of laser cladding, and provides a laser cladding method, and a laser head, a laser and a cladding system for realizing the laser cladding method aiming atthe problems of deformation and performance degradation due to the fact that an existing method of laser cladding preheating on a machined workpiece base body cannot realize real-time online heat treatment and high heating input for preheating. The laser cladding method comprises the following steps that 1, outgoing lasers of the laser are divided into preheating lasers, cladding lasers and post-processing lasers; 2, the preheating lasers are irradiated on a workpiece to be processed, and the workpiece is preheated; 3, the cladding lasers are irradiated on the preheated workpiece to be processed to form a molten pool, and at the same time, alloy powder is blown into the molten pool formed on the surface of the workpiece to be processed; and 4, the post-processing lasers are irradiated on acladding layer after cladding, and post-annealing treatment is carried out on the cladding layer.

The invention discloses a manufacturing method of a polycrystalline silicon ingot. The manufacturing method comprises the steps of paving seed crystals on the bottom of a container in a polycrystalline silicon ingot growth furnace to form a seed crystal layer; loading solid silicon raw materials on the seed crystal layer; heating the container to melt the silicon raw materials and part of seed crystal layer to form a liquid layer, and at least keeping part of the seed crystal layer contacted with the bottom of the container to be in the solid state; controlling a thermal field in the polycrystalline silicon ingot growth furnace, and crystallizing the liquid layer to form a crystallization layer so as to move a solid-liquid interface to the direction far away from the bottom of the container; moving the solid-liquid interface to the direction far away from the bottom of the container by a corresponding distance, then conducting the meltback crystallization process, at least implementing the meltback crystallization process once to obtain the polycrystalline silicon ingot. The polycrystalline silicon ingot produced by adopting the method disclosed by the invention is low in impurity content, the produced solar cell is low in cost and attenuation coefficient, and the photoelectric conversion efficiency is high.

The invention discloses an accurate forming tool of an aluminum silicon carbide composite IGBT (insulated gate bipolar translator) baseplate. The accurate forming tool comprises an aluminizing box, a guiding pipe and positioning devices, wherein the upper part of the guiding pipe is fixedly connected with a bottom surface of the aluminizing box; the upper part of the aluminizing box is provided with a cover plate which is placed in the aluminizing box, the lower part of the aluminizing box is provided with a bottom plate which is placed in the aluminizing box, the four sides of the aluminizing box are all provided with side plates which are placed in the aluminizing box; the bottom plate is provided with an impregnation flow channel of a molten aluminum alloy liquid; at least two deformation-proof partition plates are arranged among the side plates; the guiding pipe is externally sleeved with a heat preservation device. The accurate forming tool provided by the invention has the advantages that the heat preservation device can reduce the freezing rate of an alloy liquid in the guiding pipe, a final freezing region can be controlled in the position of the heat preservation device, the aluminum alloy liquid can be used for feeding a baseplate material in the aluminizing box in time, and thus a shrinkage cavity of the material is avoided; the positioning devices can strictly control the aluminum covering quantity of the two surfaces of a baseplate, the processing time is short, the cost is low, and the production efficiency is high; the aluminizing flow channel can be used for eliminating a crackle of the material and non-uniformity of an aluminum tape and the material.

The invention relates to the field of galvanizing, and particularly relates to a galvanized steel wire galvanizing device. The galvanized steel wire galvanizing device comprises a galvanizing tank, wherein a pair of guide rollers is mounted on the galvanizing tank, a galvanizing solution tank is dug in the galvanizing tank, a pair of limiting rollers are rotatably connected in the galvanizing solution tank, and steel wires are connected between the guide rollers and the limiting rollers; and an automatic heat preservation scraping mechanism is arranged in the galvanizing solution tank, arranged on the upper sides of the limiting rollers and comprises a cover plate. According to the galvanized steel wire galvanizing device, by arranging the corresponding mechanisms on the galvanizing tank,the solidification speed of a surface layer galvanizing solution is greatly decreased, an operator does not need to frequently conduct scraping work, meanwhile, the hands of the operator are liberated, the operator does not need to manually scrape the galvanizing solution solidified on the inner surface layer of the galvanizing tank, the whole device can be automatically removed, the safety of theoperator is greatly improved, meanwhile, the scraping efficiency is improved, the steel wire galvanizing effect is greatly improved, and the situation that the steel wires are affected by the solidified galvanizing solution is avoided.

The invention provides a manufacturing process of two-in-one composite plastic woven cloth, wherein a portal frame, a motor, a coating roller, an annular sliding chute, discharging devices, swing devices and a heat conduction cylinder are matched to complete operation. In the existing coating process, in general, a resin solution is directly poured onto the woven cloth, coating is carried out through the coating roller, and due to the fact that the concentration of the resin solution is high, it is difficult for the resin solution to drip, the single pouring amount of the resin solution is always unequal, and the pouring amount cannot be effectively controlled; and the temperature of the resin solution in hot melting state is higher, the phenomenon of cooling and solidification often occurs when the resin solution to be poured out is cooled, and when the resin solution is poured onto the woven cloth, the amount of the resin solution at each position of the woven cloth is unequal, and consequently the thickness of each position of a rolling layer of the woven cloth is uneven during rolling of the coating roller, With the manufacturing process of the two-in-one composite plastic woven cloth, the above problems can be solved.

The invention provides a coke oven heat-state pumping grouting construction method. The coke oven heat-state pumping grouting construction method comprises the following construction steps: arranging a slurry mixer on a middle platform or an end platform, arranging a slurry storage box in the front of the slurry mixer, and arranging a vertical slurry pump in the storage box; putting up a support frame with the height of 500 to 600 mm on the top of a furnace, and fixing a main slurry pipeline on the support frame, wherein one end of the main slurry pipeline is connected with the vertical slurry pump; arranging grouting branch pipes at the two sides of the main slurry pipeline at intervals, and arranging stop valves between the grouting branch pipes and the main slurry pipeline; and in the whole grouting process, injecting slurry into each grouting branch pipe all the time, and controlling the stop valve on each grouting branch pipe so as to realize the control on grouting points; and after the periodical grouting is finished, pumping clean water by the vertical slurry pump so as to clean the pipeline. The coke oven heat-state pumping grouting construction method has the advantages that a conventional manual conveying manner is replaced by a manner of conveying the slurry by the pipelines, so that the labor intensity of workers is greatly alleviated, the setting rate of slurry is reduced, the working efficiency is improved, the construction cost is reduced, and the construction period is shortened.

The invention provides a rapid 3D printing apparatus and method. The rapid 3D printing apparatus comprises at least two 3D printing apparatuses, at least one synchronous positioning plate, a guiding apparatus is arranged between the 3D printing apparatuses and used for guiding the synchronous positioning plate, and a positioning apparatus for positioning the synchronous positioning plate is arranged on the position of each 3D printing apparatus; and the 3D printing apparatus is provided with a spray opening of different diameters respectively corresponding to a component outline part and a component filling part. The components are layered according to a given height, an outer outline of each layer is set as a component outline part, and an area between the component outline parts is set as the component filling part; the at least one 3D printing apparatus prints the component outline part of each layer on the synchronous positioning plate, and the synchronous positioning plate is moved to another 3D printing apparatus to print the component filling part; and by virtue of the steps, the rapid 3D printing is realized. By adopting multiple independent 3D printing apparatuses with thespray openings of different diameters, on the premise of ensuring the accuracy, the 3D printing speed of the components can be greatly improved.

The invention discloses a myriawatt-level laser double-beam welding method for inhibiting a welding liquid column and splashing, and belongs to the technical field of laser processing. The technical problem that a large welding liquid column is prone to be formed and is evolved to welding splashing according to an existing myriawatt-level high-power laser in a non-penetration welding mode is solved. According to the method, two double-beam lasers which are arranged front and back in the welding direction and are different in light spot size and laser power are adopted for metal material welding, the rear laser beam is large in power and small in light spot diameter and is used for penetration fusion welding, and the front laser beam is small in power and large in light spot diameter and is used for melting base metal shallow metal to form a front molten pool, which is in Communication with a rear molten pool formed through the rear laser beam, during welding, through the mode that part of metal surges of the rear molten pool are guided to enter the front molten pool, the pressure of liquid metal on the front edge of a keyhole of the rear light beam is reduced, a longitudinal liquid column is prevented from growing and being evolved to splashing, and good surface forming of myriawatt-level high-power laser welding is achieved.

The invention discloses a laser cladding repairing method for an inner hole of a rolling mill roller end shaft sleeve. The laser cladding repairing method comprises the steps of shaft sleeve assembly disassembly, shaft sleeve surface cleaning, component detection, pre-sequence heat treatment, layered cladding, post-sequence heat treatment, machining, inspection and flaw detection and qualified product delivery. In the step (4) of pre-sequence heat treatment, specifically, preheating is carried out before cladding can be in-furnace heating and heating belt heating; or in-furnace heating and induction device heating are adopted; or the induction device is independently used for heating; and in the step of (6) post-sequence heat treatment, specifically, an induction heating mode can be induction heating or other heating modes. According to the laser cladding repairing method, a cladding layer with high wear resistance, high strength and high binding force is cladded on the surface of the inner hole of a roller end shaft, and the service life of the roller end shaft sleeve is prolonged.

The invention discloses a vacuum atomizing device. The vacuum atomizing device comprises a vacuum induction furnace, a tundish, a gas atomizing device, an atomizing cooling tower and a powder collecting system which are sequentially connected. The vacuum atomizing device further comprises a high-pressure gas supplying system; the gas atomizing device comprises a hot metal spraying head which communicates with the tundish, and a gas spraying head which communicates with the high-pressure gas supplying system. The vacuum atomizing device further comprises a salt bath device which is arranged above the gas atomizing device; the salt bath device comprises a salt bath spraying head which communicates with the salt bath device; and the salt bath spraying head is arranged between the hot metal spraying head and the gas spraying head. According to the device, the salt bath spraying head is additionally arranged between the hot metal spraying head and the gas spraying head, so that the powder surface can be subjected to thermal treatment through salt bath when the hot metal solidifies, and as a result, the powder surface solidification speed is decreased, the sphere similarity of the powderparticle surfaces can be improved, and the powder surface quality is improved.

The invention relates to a welding system for reducing aluminum alloy laser-arc hybrid welding air holes and a method. The welding system comprises a vibration device and a probe, the vibration device drives the probe to vibrate, and the probe comprises a spiral stirring part. According to the welding system, through the stirring and vibration effects of the probe, sufficient flowing of molten pool metal is guaranteed, small bubbles existing in a molten pool gather, grow and emerge from the molten pool, and therefore the risk that air holes are generated in a weld joint is reduced, the welding quality of aluminum alloy is improved, and the problem that the porosity of aluminum alloy laser-electric arc hybrid welding is high is solved; and the solidification speed of liquid metal in the molten pool is reduced through the heating probe, and the problem that weld joint components are not uniform due to too high cooling speed and insufficient molten bath flowing is solved.

The invention belongs to the related technical field of high-temperature alloy, and discloses a laser cladding repairing method and system for high-temperature alloy single crystal defects. The method comprises the following steps: S1, for a to-be-repaired object made of a high-temperature alloy single crystal, determining the lt of the to-be-repaired object; 001gt, 001gt; crystal orientation; s2, a groove is formed in the to-be-repaired position of the to-be-repaired object, laser cladding is conducted through metal powder to fill the groove layer by layer, so that repairing of the to-be-repaired object is achieved, in the laser cladding process, the off-axis heat flow direction is perpendicular to the inner surface of the slope in the groove, and the off-axis heat flow direction is as long as 1t; 001gt, 001gt; and the included angle of the nearest crystal orientation of the middle angle is not more than 30 degrees, so that the growth of mixed crystals in the repairing process is inhibited. The invention further discloses a repairing system adopted by the repairing method. According to the method, the problem that mixed crystals and cracks are easily generated in the high-temperature alloy single crystal repairing process is solved.

The invention discloses delayed coagulation cement paste for freezing shaft sinking construction and belongs to the technical field of slurry. The cement slurry comprises the following components in parts by weight: 190-210 parts of cement, 780-820 parts of fly ash, 970-1030 parts of water, 180-200 parts of glycerol and 1.3-4 parts of sulfonated lignite resin. On the premise that the final settingstrength of the cement paste reaches 10 MPa, the cement paste can be set slowly for 45 hours at the high temperature of 40 DEG C, and meanwhile, the cement paste has high flowability and low water loss.