753 results about "Quartz crucible" patented technology

The invention relates to the technical field of quartz crucible tools, in particular to a quartz crucible outer contour dimension detection tool which comprises a base, a fixing mechanism and an adjusting mechanism, a laser detector is arranged on the base, a movable disc is movably arranged on the base, a fixing shaft is fixedly arranged on the movable disc, and the quartz crucible outer contour dimension detection tool further comprises the fixing mechanism and the adjusting mechanism. The quartz crucible is centered and fixed on the base through synchronous movement of the fixing mechanism, it is ensured that the crucible is kept at the center position in the detection process, deviation or rotation is reduced, and therefore the measurement error is reduced, the position of the abutting block is adjusted through the adjusting mechanism according to the size of the inner wall of the quartz crucible, and it is ensured that the detection tool can adapt to quartz crucibles of different specifications. When the size of the quartz crucible changes, the detection tool is ensured to be always in close contact with the inner wall of the quartz crucible, and effective fixing and supporting are realized.

The invention belongs to the technical field of crucible coating optimization, and relates to an intelligent coating optimization method for quartz crucible surface treatment. According to the method, coating material data, surface treatment environment data, coating process data and performance test data are collected, the performance test data serve as a real result label of a training set, denoising, missing value processing and normalization are carried out on the collected data, and through a Pearson's correlation coefficient and a principal component analysis method, the coating material data, the surface treatment environment data, the coating process data and the performance test data are obtained. According to the method, a group of key features are screened out, data dimensions are reduced, main information influencing the coating performance is reserved, a deep neural network model is trained, the coating performance is predicted through the model, and coating process parameters are optimized by adopting a particle swarm optimization algorithm based on the predicted coating performance, so that the coating performance is optimized. According to the method, the optimal parameter combination can be effectively searched, blindness and high cost of a traditional optimization method are avoided, a closed-loop intelligent coating optimization process is formed, and the optimization efficiency and performance of the coating process are remarkably improved.

The invention relates to the technical field of crucible defect detection, in particular to a quartz crucible defect detection device based on machine vision, which comprises a quartz crucible, a detection probe and a shading mechanism for bearing the quartz crucible, a crucible wall cleaning mechanism is arranged in the quartz crucible, and a continuous driving mechanism is arranged outside the detection probe; the shading mechanism comprises a plurality of bearing assemblies which are evenly distributed and fixed by the truss, cantilevers movably installed on the bearing assemblies and a shading cover installed at the top ends of the cantilevers. The assembly line type bearing platform is provided for the inverted quartz crucibles, after the uniformly distributed quartz crucibles are adsorbed and fixed by the shading mechanism, the arranged shading cover can be matched with the curtain to provide an external light blocking environment for the quartz crucibles, and the detection probes extending into the inner cavities of the quartz crucibles can operate under the condition of avoiding the interference of light pollution of the surrounding environment; therefore, high-precision detection of cracks on the inner wall of the detection probe under the light blocking effect of the detection probe can be ensured.

The preparation method of the quartz crucible comprises the following steps that a crucible green body is prepared, the crucible green body comprises a first quartz sand layer and a second quartz sand layer which are sequentially arranged from outside to inside, and the second quartz sand layer comprises quartz sand and barium carbonate; the purity of the quartz sand in the first quartz sand layer is smaller than that of the quartz sand in the second quartz sand layer; the crucible green body is fired, and a crucible body is obtained; a protective coating is sprayed to the inner surface of a crucible body through inert gas, then gradient heating heat treatment is conducted after carbon dioxide gas is introduced, the quartz crucible is obtained, the quartz crucible comprises the crucible body and a protective layer located on the inner surface of the crucible body, and the protective layer comprises barium carbonate, nano silicon dioxide and barium borate. According to the preparation method of the quartz crucible, the binding force between the protective coating and the inner surface of the quartz crucible can be improved, the corrosion resistance of the quartz crucible is improved, and the service life of the quartz crucible is prolonged.

The invention discloses a method for preparing ultra-high-purity quartz by multi-stage synergistic purification of quartz ore, and belongs to the technical field of ultra-high-purity quartz preparation. According to the method, natural quartz ore is used as a raw material, mineral impurities, lattice impurities and inclusions in quartz are deeply removed through multi-stage synergistic processes such as low-temperature plasma activation, biological leaching, supercritical CO2-assisted acid leaching, microwave-assisted chloridizing roasting and pulsed electric field enhanced acid leaching, and finally a high-purity quartz product with the SiO2 purity larger than or equal to 99.998% (4N8 grade) is obtained. According to the invention, a low-temperature plasma activation technology, microbial metallurgy, supercritical fluid extraction and a pulsed electric field strengthening technology are organically combined, so that the energy efficiency bottleneck and environmental protection limitation of a traditional high-purity quartz preparation process are broken through; the obtained quartz sand product can reach the standards of high-purity quartz sand for semiconductor quartz glass and high-purity quartz sand for photovoltaic quartz crucibles.

The invention provides a quartz crucible grinding device and method, and relates to the technical field of quartz crucible grinding. The quartz crucible grinding device comprises a grinding frame and a grinding mechanism arranged on the grinding frame; a rotating rod is arranged on the grinding frame, a connecting block is fixedly connected to the rotating rod, a sliding groove is formed in the connecting block, a clamping plate is slidably connected to the connecting block, the clamping plate is slidably connected into the sliding groove, a sliding block is slidably connected to the clamping plate, and an abutting roller is rotatably connected to the sliding block. The abutting roller is used for abutting against the outer side wall of the quartz crucible. By means of the quartz crucible polishing device, damage to the quartz crucible can be reduced when the quartz crucible is polished.

The invention provides a single crystal furnace and a monocrystalline silicon preparation method, and belongs to the technical field of semiconductors. The single crystal furnace comprises a furnace body; the graphite crucible is positioned in the furnace body; the quartz crucible is positioned in the graphite crucible and is used for containing a multi-silicon crystal material to be molten; the cylindrical side heater is coaxial with the furnace body and is arranged on the outer side of the graphite crucible in a sleeving manner; the bottom heater is arranged at the bottom of the graphite crucible; the guide cylinder is positioned above the quartz crucible; the controller is connected with the side heater and the bottom heater through electrodes and used for controlling power output to the side heater and the bottom heater. According to the invention, a uniform and controllable thermal environment can be provided, the yield of the silicon single crystal rod is improved, and the quality of the drawn silicon single crystal rod is ensured.

The invention discloses a global scanning image splicing and defect positioning system for an ultra-large-diameter quartz crucible, and relates to the technical field of quartz crucibles, and the system comprises a scanning control module which constructs a fusion model through multiple sensors, evaluates a risk coefficient, obtains the fusion model, dynamically plans a multi-arm path of a robot based on reinforcement learning, and sends the multi-arm path of the robot; adaptively adjusting the acquisition frequency of the corresponding area based on the risk coefficient, and outputting multi-modal data through a multi-round feedback iteration optimization acquisition process; the image splicing module is used for acquiring multi-modal data for local splicing, and generating a panoramic image in combination with a multi-arm path of the robot; the defect positioning module is used for constructing a quartz crucible model through the panoramic image, detecting defects in a layered manner by utilizing a YOLOv5 model, tracking the defects through extended state Kalman filtering, quantifying the defect volume and the hazard level by combining point cloud semantic segmentation, and performing 3D positioning and evaluation on the defects; the output data is ensured to always meet the subsequent image splicing and defect positioning requirements, and the system stability is guaranteed.

The invention provides a corrosion-resistant and high-temperature-resistant composite quartz crucible and a preparation method thereof. The quartz crucible sequentially comprises the following laminated layers in parts by weight from inside to outside: 50-100 parts of an inner layer, 200-400 parts of a transition layer, 150-250 parts of a reinforcing layer and 40-80 parts of an outer layer, the preparation method comprises the following steps: forming layer by layer: sequentially adding inner-layer slurry, transition-layer powder, a reinforcement-layer prefabricated member and outer-layer slurry into a mold for forming; gradient drying is conducted, specifically, the formed crucible blank is put into a drying box to be subjected to gradient drying; and step-by-step sintering: putting the dried crucible blank into a high-temperature sintering furnace, carrying out step-by-step sintering, and cooling and demolding to obtain a crucible product. A composite protection system is designed and constructed through four layers of functionally graded materials, the prepared composite quartz crucible has excellent high temperature resistance, corrosion resistance and structural stability and can be applied to large-size semiconductor single crystal furnaces, and the engineering advantage of the preparation process is remarkable.

The utility model relates to the technical field of quartz crucible surface quality automatic detection, and discloses a crucible clamp which comprises a clamp and a crucible, and the crucible can be arranged under the clamp. The clamp comprises a supporting clamping jaw assembly, a driving clamping jaw assembly, a vacuum suction cup, a linear guide rail, a servo electric cylinder and a connecting flange, a feeding station is arranged at the bottom of the crucible, a robot is connected to the top of the clamp, and a visual inspection device a and a visual inspection device b are arranged on the left side and the right side of the robot correspondingly; a discharging station is arranged on the outer side of the robot. According to the crucible clamp, the crucible is grabbed from the conveying line through the robot and the crucible clamp, the crucible is conveyed to a detection area of visual detection equipment, the robot and the crucible clamp are used for clamping a workpiece, and various complex motions such as rotation, horizontal movement, up-down movement and front-back movement of the crucible are controlled in cooperation with a track required by visual detection; and comprehensive visual inspection is carried out on the crucible, so that the detection quality and efficiency can be greatly improved.

The invention relates to a quartz crucible coating and a preparation method thereof.The coating is of a double-layer composite structure and comprises a substrate layer and a functional layer, the substrate layer is composed of 40-65 vol% of polycrystalline silicon powder (the particle size D50 ranges from 1 micrometer to 5 micrometers) and 35-60 vol% of nanometer silica sol, and the functional layer covers the surface of the substrate layer and is composed of 50-70 vol% of polycrystalline silicon powder, 20-35 vol% of nanometer silica sol and 5-15 vol% of calcium fluoride powder (the particle size D90 is smaller than 0.5 micrometer). The preparation method comprises the following steps: preparing a substrate layer slurry and a functional layer slurry, sequentially coating the inner wall of a crucible with the slurry, drying, and sintering in an inert atmosphere according to a three-step temperature control program to finally form a coating with the thickness of 180-300 microns and the porosity of 8-15 vol%; the coating structure can avoid pollution of silicon nitride or silicon carbide particles, has excellent demolding performance, thermal stability and adhesive force, further improves the service life of a crucible and the purity of a silicon ingot, and meets the requirements of an advanced semiconductor process for cleanliness and reliability.

The invention discloses an intelligent visual full-inspection system for delivery quality of a quartz crucible, and belongs to a quartz crucible quality inspection technology. The method comprises the following steps: acquiring a two-dimensional surface image and a two-dimensional layered image of a crucible through first equipment and second equipment; the data acquisition unit acquires the data and is used for providing data basis for the defect detection unit and the microbubble detection unit. The defect detection unit needs to detect a plurality of defect categories, so that the defect detection model is constructed according to an improved YOLOv11 model; the bubble detection model of the microbubble detection unit can detect only one type of defects, and the bubble detection model is constructed according to a YOLOv11 model. Therefore, the overall overhead of the system is reduced while the detection precision is guaranteed. The transparent layer bubble detection unit eliminates repeatedly counted bubbles through similar bubble fusion, so that the reliability of the number of the bubbles is guaranteed; the visual unit fuses physical parameters and visual data, and provides reliable basis for crucible quality evaluation.

The invention belongs to the technical field of quartz sand, and particularly relates to a method for evaluating quartz sand for producing a bubble-free quartz crucible and a product thereof, a plurality of samples are taken from a batch of quartz sand to be used, the transparency of the quartz sand samples is detected in a normal temperature state, and if the proportion of the quartz sand samples with the transparency less than 75% is less than or equal to 5%, the quartz sand samples with the transparency less than 75% are judged to be the quartz sand samples with the transparency less than 75%. If the pH value is less than 5, pores, cracks and the like are generated in the crucible or on the surface of the crucible to influence the service life and the performance of the crucible, and if the pH value is greater than or equal to 5 and less than or equal to 7, the transparency of the quartz sand sample after high-temperature heating is detected, and the transparency of the quartz sand sample after high-temperature heating is determined to be less than or equal to 7. As the negative characteristic of the quartz sand after high-temperature heating appears, if the proportion of the quartz sand with the transparency less than 75% of the heated quartz sand sample is less than or equal to 5%, the evaluated quartz sand is obtained, and the quartz crucible produced by using the evaluated quartz sand is free of bubbles, relatively high in quality and long in service life.

The invention discloses a quartz crucible detection device, and relates to the technical field of quartz crucible detection. The device comprises a supporting and clamping assembly, the supporting and clamping assembly comprises a transmission adjusting plate, the upper surface of the transmission adjusting plate is fixedly connected with a transmission supporting plate, one end of the transmission supporting plate is fixedly connected with a clamping limiting plate, and the upper surface of one clamping limiting plate is fixedly provided with a pressing-down measuring assembly. The pressing measuring assembly comprises a hollow supporting column and a pressing supporting plate, a guide sliding way is formed in the peripheral side face of the hollow supporting column, a pressing transmission column is fixedly connected to one side face of the pressing supporting plate, and the pressing transmission column is in sliding fit with the guide sliding way. Through synchronous horizontal movement of a transmission supporting plate, the transmission supporting plate enables clamping limiting plates to be close to each other until the clamping limiting plates are attached to the circumferential side face of a crucible, a downward pressing transmission column slides along the interior of a guide sliding way, and a downward pressing supporting plate rotates by 90 degrees and moves downwards; detection of the diameter of the crucible and detection of the thickness of the bottom of the crucible are realized.

The utility model relates to the technical field of quartz detection platforms, and discloses a quartz product nondestructive testing platform which comprises a workbench, a mounting frame is fixedly mounted at the top of the workbench, a cleaning mechanism is arranged at the bottom of the mounting frame, a clamping mechanism is arranged at the bottom of the mounting frame, and the cleaning mechanism comprises a rotating assembly and an adjusting assembly. The adjusting assembly is arranged at the bottom of the rotating assembly. The threaded rod is rotated, and the position of the cleaning rod is adjusted, so that the cleaning rod is attached to the inner wall of the quartz crucible, the cleaning rod cleans the inner wall of the quartz crucible, dust on the inner wall of the quartz crucible is cleaned up, dust impurities in the quartz crucible are prevented from influencing the detection result, and the detection efficiency and the detection precision are improved; according to the quartz crucible cleaning device, the quartz crucible can be clamped by the clamping frame, the quartz crucible is prevented from moving in the cleaning process, the quartz crucible can be stabilized, and meanwhile the quartz crucible cleaning device can be adjusted according to the size of the quartz crucible.

The invention relates to the technical field of quartz crucibles, and particularly discloses a melting method for reducing microbubbles on the inner surface layer of a quartz crucible. The arc vacuum melting in the melting method disclosed by the invention comprises the following steps of: rising a heat shielding plate to a position which is 350-450mm away from the upper edge of a mold, and melting the inner surface of a crucible for 45-75s by utilizing a high current which is more than 5000A; then moving down the heat shielding plate, keeping the current unchanged, and melting; the heat shielding plate is lifted, the current is adjusted to be 2200-2500 A, and a transparent layer is formed through vacuum melting; stable melting: adjusting the current to be more than 5000A, and performing high-temperature evaporation; then, the current is adjusted to be reduced to 1800-2200 A, and low-temperature melting is conducted for 120-240 s; and repeating stable melting to obtain the quartz crucible to be demoulded. By means of the technical scheme, the number of microbubbles of the prepared quartz crucible is obviously reduced, the compression strength of the crucible is greatly improved, and the service life of the crucible is greatly prolonged.

The invention provides a novel quartz crucible which comprises a crucible wall and is characterized in that a protective layer surrounding the crucible wall is arranged on the outer side of at least one part of the crucible wall, and the protective layer is a transparent layer. Compared with an existing quartz crucible structure, the quartz crucible provided by the invention has the advantages that the transparent state layer with compactness is additionally arranged, so that the strength of the outermost layer of the quartz crucible can be improved, the reaction probability of the quartz crucible and a carbon crucible can be reduced, and the service life of the quartz crucible is prolonged. The invention further provides a manufacturing process for the quartz crucible, the thickness of each layer and the distribution condition of quartz sand in each layer are controlled by adjusting the vacuum condition and the melting temperature during melting, and a uniform and compact transparent protection layer is obtained on the outer wall surface of the crucible wall of the existing quartz crucible; the reaction probability of the outermost side of the quartz crucible and the carbon crucible is reduced to the maximum extent, the strength of the quartz crucible is improved, and the service life of the quartz crucible is prolonged.

The invention belongs to the technical field of crucible manufacturing, and particularly relates to a composite ultra-high-temperature quartz crucible and a preparation method thereof.The composite ultra-high-temperature quartz crucible is prepared from 10-12 parts of a main body mixture, 0.5 part of an inner coating material and 2-3 parts of an outer substrate material; high-purity quartz sand is treated under an alkaline condition to obtain hydroxylated quartz sand, the hydroxylated quartz sand reacts with a silanol solution to obtain condensed quartz sand, high-purity graphite powder and high-purity carbon powder are further added, oxygen of the condensed quartz sand is partially substituted, composite quartz sand rich in Si-O-Si bonds and Si-C bonds is obtained, the high-purity silicon powder serves as a substrate, high-purity silicon nitride is introduced, and the composite quartz sand is prepared. The main body mixture is prepared to improve the overall temperature resistance and thermal shock resistance of the material; an inner coating material is arranged on the inner layer, so that the material is prevented from being corroded; the outer substrate material is arranged on the periphery, so that the overall strength and toughness of the quartz crucible are enhanced, and corrosion of the external environment to the quartz crucible is resisted.

A graphite susceptor for supporting a quartz crucible during a crystal growth process includes a body having an inner surface and a coating deposited onto the inner surface. The inner surface of the body defines a cavity, and the cavity has a size and shape complementary to an exterior size and shape of the crucible. The coating comprises boron nitride and a sintering additive. The sintering additive is configured to promote densification of the boron nitride.

The invention provides a quartz crucible performance detection method based on a high-temperature drawing process. The quartz crucible performance detection method comprises the following steps: S1, selecting a quartz crucible sample from a batch of prepared quartz crucibles; s2, sampling the quartz crucible sample to obtain a sample block to be experimented; s3, slicing the sample block along the longitudinal direction of the quartz crucible to obtain a first sample wafer, and photographing the first sample wafer to obtain microbubble data of the first sample wafer; s4, cleaning and drying the sliced sample blocks; s5, the dried sample blocks are heated and calcined, and heating and calcining parameters are designed according to parameters in the crystal pulling process; s6, slicing the calcined sample block along the longitudinal direction of the quartz crucible again to obtain a second sample wafer, and photographing the second sample wafer to obtain microbubble data of the second sample wafer; and S7, based on the microbubble data of the first sample wafer and the microbubble data of the second sample wafer, obtaining a performance detection result of the batch of quartz crucibles so as to improve the accuracy of crucible performance detection.

The invention provides a quartz crucible crushing device and method.The quartz crucible crushing device comprises a vibration platform, a clamping assembly and a knocking assembly, the vibration platform is used for placing a carbon-carbon crucible with a quartz crucible, the outer side wall of the carbon-carbon crucible is placed on the vibration platform, and the clamping assembly is used for clamping the carbon-carbon crucible; the clamping assemblies are oppositely arranged on the two sides of the vibration platform and used for clamping the carbon-carbon crucible, and the knocking assembly is arranged on the side, not provided with the clamping assemblies, of the vibration platform, can move along the inner side wall of the quartz crucible and is used for knocking the inner side wall of the quartz crucible. The automatic crushing device has the beneficial effects that automatic crushing of the quartz crucible is achieved in a knocking and vibrating mode, the crushing effect is guaranteed, the working intensity is reduced, potential safety hazards are reduced, the working efficiency is improved, damage to the carbon-carbon crucible is reduced, and the service life of the carbon-carbon crucible is prolonged.

The invention provides a quartz crucible for continuously drawing crystalline silicon and a preparation method of the quartz crucible, and belongs to the technical field of crucible manufacturing. Comprising the following steps: S1, performing electric arc melting on quartz sand to obtain a blank quartz crucible with a smooth inner surface and a rough outer surface; s2, the blank quartz crucible is sequentially subjected to outer surface sand blasting, outer surface grinding, height cutting, first cleaning, outer surface fire machining polishing, second cleaning and drying procedures, and the inner surface roughness Rlt is obtained; the thickness is 5 microns, and the roughness of the outer surface is Ralt; the invention discloses a 5-micron quartz crucible. Therefore, the quartz crucible can reduce oxygen brought into silicon liquid in the process of drawing crystalline silicon, the oxygen content of the crystalline silicon is reduced, and the quality of the crystalline silicon is improved.

The quartz crucible raw material processing device comprises a supporting assembly, a driving mechanism, a crushing and grinding bin, a grinding assembly, a discharging assembly and a crushing mechanism, and the driving mechanism is arranged at the top of the supporting assembly; the crushing and grinding bin is mounted at the top end of the driving mechanism; the grinding assembly is arranged in the crushing and grinding bin and comprises a grinding roller, an upper baffle, a driven wheel and a lower baffle, the grinding roller is rotationally installed in the crushing and grinding bin, the upper baffle and the lower baffle are both installed in the crushing and grinding bin and located on the outer side of the grinding roller, and the driven wheel is connected with the grinding roller; and the driven wheel penetrates through the crushing and grinding bin and is in transmission connection with the driving mechanism. Therefore, in the quartz stone machining process, the splashing phenomenon of quartz stone fragments is effectively reduced, potential damage of the fragments to the crushing device is reduced, and potential safety hazards to field workers are effectively reduced.

The invention discloses a single crystal crucible side cleaning machine, which belongs to the technical field of crucible silicon material recovery, and is characterized by comprising a clamping mechanism which is arranged in a shell and is used for clamping a crucible side, and an overturning mechanism which is matched with the clamping mechanism to realize overturning of a crucible, the overturning mechanism realizes overturning of the crucible, and the clamping mechanism is used for clamping the crucible side. A crucible is placed on a walking vehicle, a quartz collecting box placed in the shell is used for receiving quartz fragments dumped after the crucible is turned over, and the breaking hammer is used for conducting vibration breaking on a crucible bottom material of the crucible and is driven by a first air cylinder to be close to or away from the crucible. The technical problem that the cooled quartz crucible is difficult to separate from the carbon-carbon crucible is solved, and the device is mainly applied to crushing and cleaning of quartz materials.

The utility model discloses a crucible which comprises a quartz crucible body and a carbon-carbon crucible side, the quartz crucible body is arranged in a bowl body, adjacent to a silicon nitride layer, of the crucible side body, and the silicon nitride layer enables the quartz crucible body and the crucible side body to be arranged at an interval. When the silicon nitride layer is a silicon nitride paper layer, the distance between the upper edge of the silicon nitride paper layer and the upper edge of the quartz crucible body is L1, and L1 is larger than or equal to 50 mm. According to the crucible disclosed by the utility model, the silicon nitride layer is arranged between the quartz crucible body and the crucible edge body to separate the quartz crucible body from the crucible edge body, so that the reaction between the quartz crucible body and the crucible edge body can be avoided, no gas is generated, the abnormal conditions such as bulge and deformation of the crucible can be effectively avoided, and the crucible can be normally used.

The quartz crucible surface grinding equipment comprises a grinding table, two limiting rotating mechanisms, a first grinding mechanism and a second grinding mechanism, a supporting plate is arranged on the grinding table, a driving part is arranged on the supporting plate, one limiting rotating mechanism is connected with the output end of the driving part, and the other limiting rotating mechanism is connected with the output end of the driving part. The other limiting rotating mechanism is arranged on the grinding table through a supporting seat, and the two limiting rotating mechanisms are symmetrically arranged up and down; a first sliding table module is arranged on the grinding table, and a sliding plate is arranged on a sliding table of the first sliding table module; the first grinding mechanism is arranged on the sliding plate and located on one side of the limiting rotating mechanism, a second sliding table module is arranged on the grinding table, and a sliding frame is arranged on a sliding table of the second sliding table module; the second grinding mechanism is arranged on the sliding frame and located on the opposite side of the first grinding mechanism. Therefore, synchronous grinding of the inner wall and the outer wall of the crucible can be achieved, only one-time clamping is needed, and operation is convenient and fast. And the polishing range completely covers the inner wall, the outer wall and the bottom surface of the crucible, and the polishing efficiency is remarkably improved.

A method for growing an indium arsenide single crystal comprises the following steps: S1, cleaning a quartz crucible; S2, loading: loading an indium arsenide seed crystal, an indium arsenide polycrystal, and a liquid sealant into a PBN crucible, and then loading the PBN crucible into a quartz crucible; S3, filling with hydrogen and welding a pipe: plugging a quartz sealing bubble into the opening of the quartz crucible, and then installing the quartz crucible on a sealing flange, evacuating the air, opening the valve of a hydrogen gas cylinder, and introducing hydrogen into the quartz crucible, and opening a hydrogen-oxygen flame, and then welding the quartz crucible and the quartz sealing bubble at a full 360° angle. Upper welding seal; S4, furnace loading: load the quartz crucible sealed by quartz bubble welding into the VGF furnace; S5, heating and seeding: VGF furnace controls temperature rise and keeps warm for 24 hours after stabilization; S6, single crystal growth: VGF furnace controls temperature using VGF process, reducing heating power from bottom to top to cool down, so that the crystal growth surface grows at 0.5mm / h at the position corresponding to the shoulder of the PBN crucible, and the crystal growth surface grows at 0.8mm / h at the position corresponding to the equal diameter part of the PBN crucible.

The invention discloses a process for improving oxygen ring defects, and relates to the field of Czochralski single crystal manufacturing, the process comprises the following steps: S1, preparing a single crystal furnace: the single crystal furnace comprises a carbon felt, a quartz crucible, a graphite support, a solution, a heater, a heat shield, a crystal bar, a furnace body shell and an argon pipe; s2, crystal pulling treatment; s3, setting different liquid opening distances to produce crystal bars for small-batch battery verification, and monitoring the OSF generation condition after battery topcon high-temperature diffusion heat treatment; and S4, carrying out an oxygen precipitation heat treatment process and a Cu diffusion process on the material for impurity removal. According to the technology for improving the oxygen ring defect, the position of a heat shield is adjusted, monocrystalline silicon oxidation induced staggered rings are reduced, on the basis of the forming principle of the defect, the V / G value of a solid-liquid interface is controlled to be larger than the critical value of 0.13 mm < 2 > min <-1 > k <-1 > in the production process, and reduction of thermal stress is controlled; higher vacancy concentration can be obtained, dislocation can be reduced, and OSF-ring generation can be avoided.

The invention provides a multi-melting-machine collaborative vacuumizing control system and control method, and belongs to the technical field of quartz crucible manufacturing, the multi-melting-machine collaborative vacuumizing control system comprises a main controller, a main vacuumizing assembly, a plurality of branch vacuumizing assemblies and a plurality of melting machines; the main vacuumizing assembly is connected with the multiple branch vacuumizing assemblies through the vacuum main pipeline, and the multiple branch vacuumizing assemblies are connected with the multiple melting machines in a one-to-one correspondence mode through the melting machine connecting vacuum pipes. The main vacuumizing assembly comprises a vacuum pump, a first pneumatic valve, a first proportional electromagnetic valve, a vacuum tank and a vacuum main valve which are connected in sequence; the branch vacuumizing assembly comprises a vacuum proportion regulating valve, a buffer tank and a vacuumizing valve which are connected in sequence; a vacuum tank is arranged, and the vacuum pressure in the vacuum tank is kept constant by controlling a first pneumatic valve and a first proportional electromagnetic valve; the buffer tanks are arranged on the branches, and the vacuum pressure in the buffer tanks is controlled by the vacuum proportioning valves to be kept constant, so that a stable vacuum system is formed in the melting process of the quartz crucible.

The invention discloses a double-layer composite quartz crucible surface defect detection method based on machine vision, and relates to the technical field of crucible surface defect detection, and the method comprises the following steps: a conveyor belt conveys double-layer composite quartz crucibles to a detection area at a preset speed to ensure that each crucible can move in sequence on a production line; and a detection visual field of a machine vision system is stably entered. According to the method, key features such as the microstructure change index and the crack interval variability index are extracted, so that a machine vision system can identify complex defects more accurately, and misjudgment and missing detection are avoided. According to the method, the detection precision of complex defects is improved by enhancing image processing. And in combination with a machine learning model, the system intelligently evaluates the defect complexity and dynamically adjusts the conveyor belt speed. For simple defects, the high speed is kept, so that the production rhythm is not influenced; for complex defects, the speed of the conveyor belt is reduced, and time is provided for detailed analysis, so that the defect recognition rate is improved, and the product quality is ensured while efficient production is ensured.