212 results about "Graphite crucible" patented technology

The invention relates to the field of silicon carbide wafer preparation, in particular to a semi-insulating silicon carbide wafer annealing device and method, the annealing device comprises a crucible cover and a graphite crucible which are detachably connected, an annealing chamber is arranged in the graphite crucible, the annealing chamber comprises a wafer supporting area and a powder area, and the powder area is arranged in the crucible cover. The gas pressure control assembly is used for controlling gas components and pressure intensity in the annealing chamber; the heating device is used for heating the annealing chamber in a partitioned manner; and the heat preservation system is arranged outside the crucible cover and the graphite crucible in a sleeving manner. By means of the annealing device, the problems of silicon carbide wafer intrinsic point defect screening and concentration control can be effectively solved, the Fermi energy level is controlled at the EH6 / 7 energy level position, and the silicon carbide wafer obtained through annealing finally achieves control over the electrical resistivity larger than 1E12 ohm cm.

The invention discloses a ceramic component gradient modified C / C-SiC-ZrC composite material and a preparation method thereof, and belongs to the technical field of carbon / carbon composite material matrix modification preparation, a carbon fiber preform and a heating element are placed in chemical liquid phase vaporization deposition equipment, a precursor solution is added until the carbon fiber preform is fully soaked, and a ceramic component gradient modified C / C-SiC-ZrC composite material is obtained; and carrying out chemical liquid phase vaporization deposition reaction to obtain the low-density C / C composite material with porosity in unidirectional gradient distribution. And putting the mixture into a graphite crucible with a carbon-rich area facing downwards and a carbon-less area facing upwards, completely putting the graphite crucible into the ceramic powder for modification, reacting and infiltrating, and cooling to room temperature to obtain the C / C-SiC-ZrC composite material with the gradient modified ceramic components. The end with high ceramic content endows the material with a high-temperature thermal protection function, the end with high pyrolytic carbon content can effectively conduct heat generated in a ceramic-rich area, and the end with low ceramic content can effectively conduct heat generated in a ceramic-rich area. Due to the gradient design from the ceramic-rich area to the carbon-rich area, the material has high-temperature oxidation resistance and ablation resistance and is light, and lightweight design of an aerospace thermal protection structure is facilitated.

The invention provides a method for synchronously recovering iron and rare earth from iron separation tailings, which comprises the following steps of: roasting the pretreated iron separation tailings in a graphite crucible to obtain a roasted product; the roasted product is crushed and screened, oversize products and undersize products are obtained, and the oversize products are reduced iron products; the screen underflow and an acid solution are mixed for leaching, and leaching liquid containing rare earth elements and acid leaching residues are obtained; and adding a precipitant into the leachate to obtain a precipitate containing rare earth elements, and recovering fluorite concentrate from the acid leaching residues. According to the method, the traditional disjunction mode of pre-enrichment and then smelting is broken through, a roasting-acid leaching integrated process with deep beneficiation and smelting coupling is provided, the complex pre-enrichment link is abandoned, efficient and synchronous recovery of iron and rare earth is achieved, and the method has the advantages of being short in process, low in energy consumption, few in flotation reagent, high in rare earth recovery rate, high in resource comprehensive utilization rate and the like.

The invention belongs to the technical field of preparation of high-temperature heat-insulating and electromagnetic wave-absorbing materials, and relates to a bamboo-like silicon carbide nanowire based on freeze-dried vegetables / fruits and a preparation method and application of the bamboo-like silicon carbide nanowire based on the freeze-dried vegetables / fruits, and the preparation method comprises the following steps: putting the vegetables / fruits in a freeze dryer to obtain the freeze-dried vegetables / fruits; putting the freeze-dried vegetables / fruits into a high-temperature tubular furnace for carbonization to obtain a carbon template; putting the carbon template and a silicon source into a graphite crucible, putting the graphite crucible into a high-temperature tubular furnace, and calcining to obtain the bamboo-like silicon carbide nanowire based on the freeze-dried vegetables / fruits. The bamboo-like silicon carbide nanowire prepared by the method has excellent high-temperature heat insulation property and remarkable broadband electromagnetic wave absorption property, so that the enhancement of double functions of heat insulation and wave absorption is synergistically realized on the basis of a single material. The preparation process is simple and stable in flow, good in repeatability, green in raw material and extremely low in cost, and the problems of collapse and atrophy of the material structure caused by high temperature are solved.

The invention relates to the technical field of physical detection, in particular to a graphite crucible detection device which comprises a shell, a supporting table, a storage table, a positioning and sealing unit and a detection unit, the positioning and sealing unit comprises a limiting assembly, a transmission control assembly and a clamping and sealing assembly, the limiting assembly is used for automatically centering and positioning a graphite crucible arranged on the storage table, and the transmission control assembly is used for transmitting the transmission control assembly to the clamping and sealing assembly; the transmission control assembly drives the clamping sealing assembly to press downwards in a linkage mode, so that the sealing seat is tightly attached to the crucible and the object placing table to form a sealed space, the detection unit comprises a detector capable of lifting and rotating and a water injection detection system, and the detector is used for scanning the inner wall of the crucible to detect mass distribution uniformity; according to the invention, rapid positioning, sealing and multi-index integrated detection of the graphite crucible are realized, the detection efficiency and accuracy are significantly improved, and the graphite crucible crack detection device is suitable for comprehensive evaluation of the quality of the graphite crucible in an industrial field.

The application provides a preparation method of a Si-based multi-component alloy bonding layer in an environmental barrier coating, and steps are as follows: S1, substrate preparation: taking SiC fiber reinforced SiC composite material as a substrate; S2, preparation of the Si-based multi-component alloy bonding layer: S21, the preparation process is carried out in a directional solidification crystal growth furnace, the furnace comprises a quartz glass tube, a graphite crucible and a heating device; S22, adding silicon material and X metal material into the graphite crucible; S23, fixing the substrate above the graphite crucible; S24, vacuumizing the quartz glass tube; S25, introducing cooling water, turning on the power supply, heating the graphite crucible through the heating device, until the silicon material and the X metal material in the graphite crucible are completely melted into Si-based alloy melt with fluidity; S26, immersing the pre-grown coating composite material substrate into the melt, and then gradually separating the substrate from the Si-based alloy melt through slow downward pulling of the graphite crucible, growing the Si-based alloy on the surface of the composite material uniformly, and preparing the Si-based multi-component alloy bonding layer.

The utility model belongs to the technical field of swing mechanism, especially a graphite crucible calcination tunnel kiln swing mechanism, including the ditch, swing car track, swing car, tunnel track, kiln car, the ditch sets up below ground, and the kiln car includes swing platform, and the bottom of swing platform is equipped with wheel shaft support, and the inner side of wheel shaft support is rotatably installed with driving axle, driven axle, and the both ends of driving axle, driven axle are fixedly connected with driving wheel, driven wheel respectively, and the top of swing platform is installed with transfer track, and the top of swing platform is also equipped with mounting groove, and the inner side of mounting groove is installed with kiln car push -and -pull mechanism, and the top of swing platform is equipped with first sliding slot, second sliding slot, the device can prevent the guide wheel of kiln car bottom from extruding transfer track due to inertia in the swing car operation process, causes its wear and tear and deformation damage to be unable to use the problem of, promotes the service life of transfer track, ensures swing operation process safety and stability.

The application belongs to the technical field of metallurgy, and particularly relates to a device and method for preparing high-purity silicon film based on vacuum degree control electrolytic silicon purification. The device creates a closed environment through a vacuum cabin, and utilizes a connected vacuumizing mechanism and a vacuum degree adjusting device to accurately control the vacuum degree in the cabin. A material storage mechanism is used for storing silicon materials, and is composed of a corundum crucible and a graphite crucible sleeved outside the corundum crucible. A heating mechanism heats the materials through electromagnetic induction. The method first heats impurity-containing electrolytic silicon in a vacuum environment in a deimpurification mode, so that impurities with higher saturated vapor pressure are preferentially volatilized and deposited on the inner wall of the cabin, thereby realizing preliminary purification. Then, in an evaporation mode, the purified silicon material is heated to a volatilization temperature again, so that it is vapor-deposited on the upper base material to directly form a high-purity silicon film. The scheme integrates the purification and film forming processes, and simplifies the process.

The present disclosure provides a method for reducing and separating lithium battery black powder. A method for reducing and separating lithium battery black powder, the separation method comprising the following steps: S1, a molten salt including NaF-AlF3 base or KF-AlF3 base or NaF-KF-AlF3 base is contained in a graphite crucible, and the black powder and the metal reducing agent are contained in the graphite crucible; S2, the graphite crucible is placed in a stainless steel crucible as a whole; S3, the stainless steel crucible is placed in a high-temperature resistance furnace as a whole, the substance in the graphite crucible is melted by heating, and the stainless steel crucible is rotated at the same time; S4, the stainless steel crucible and the graphite crucible are disassembled, white molten salt and Ni, Mn, Co metal alloy are obtained, by reacting the black powder with the molten salt and the metal reducing agent, the Ni, Co, Mn compound is converted into the corresponding metal alloy in the molten salt and the metal reducing agent, and then deposited at the bottom of the molten salt, finally through the operation such as slagging, the precipitate can be taken out.

The utility model relates to a graphite crucible belongs to high temperature smelting equipment technical field. Among them, graphite crucible includes: the crucible body has the first wall body and second wall body with the wall thickness is formed, and the first wall body is located the outside of second wall body, the top of second wall body is lower than the top of first wall body, to make second wall body and first wall body form the step between, the cover body, cover is established on the step, among them, the recess is provided on the first wall body, and the recess is along the circumference of the crucible body and sets up, and the depth of recess is greater than 0 and is less than or equal to 10. Through the recess along the circumference of the crucible body and sets up, to make the gripper of mobile equipment when the graphite crucible is clamped, the gripper can be held at the recess, to realize the quick positioning of the crucible body, simultaneously, still can make at least partial gripper can be housed in the recess, with the recess forms the card and holds, avoids the sliding between the gripper and the crucible body, to avoid the occurrence of the fall of the crucible body, improves the service life of the crucible.

The hydrogen storage alloy is prepared from magnesium-zinc alloy powder, lanthanum-nickel alloy powder and PE plastic particles. The magnesium-zinc alloy comprises the following components in percentage by weight: 28 to 32 percent of Zn (zinc), 0.004 to 0.008 percent of Al (aluminum), 0.0010 to 0.0015 percent of Fe (iron), 0.0008 to 0.0014 percent of Si (silicon), 0.0008 to 0.0015 percent of Mn (manganese), 0.00010 to 0.0002 percent of Cu (copper), 0.00020 to 0.0003 percent of Ni (nickel) and the balance of Mg (magnesium); the lanthanum-nickel alloy comprises 46-52 wt% of La, 48-54 wt% of Ni, less than 0.2 wt% of Fe and less than 0.03 wt% of C; the magnesium-zinc alloy powder and the lanthanum-nickel alloy powder are mixed according to the mass ratio of 98: 2 and then mixed with the PE plastic particles according to the mass percent of 2: 1; and putting the mixed raw materials into a graphite crucible, and smelting the mixed raw materials by adopting an argon arc welding machine to obtain the hydrogen storage alloy of a blocky sample. The scheme is low in cost, and plastic recycling is achieved.

The utility model provides a graphite crucible shelf which comprises a base, a stand column and a supporting plate assembly, a groove is formed in the middle of the base, a sleeve is installed in the groove, the bottom end of the stand column is inserted into the sleeve, the supporting plate assembly comprises two supporting plate mechanisms symmetrically installed on the two sides of the stand column, and each supporting plate mechanism comprises an upper supporting plate, a middle supporting plate and a lower supporting plate. The graphite crucible placing rack is novel in structural design, graphite crucibles of different sizes can be placed on the graphite crucible placing rack, the overall structural strength is high, the graphite crucibles can be conveniently taken and placed, and the working efficiency is improved.

The utility model provides a gas pre-decomposer for a high-temperature purification furnace, and belongs to the technical field of high-temperature industrial electric furnaces. The problem that an existing gas pre-decomposition device for the high-temperature purification furnace is low in decomposition efficiency is solved. Comprising a shell, a graphite crucible is arranged in the shell, the outer side of the graphite crucible is coated with a heat preservation layer, an induction coil is wound on the outer side of the shell, a filter element is arranged in the graphite crucible, an air inlet is formed in one end of the shell, an air outlet is formed in the other end of the shell, and thermocouples are arranged on the two sides of the air inlet respectively. The thermocouple penetrates through the heat preservation layer and then is inserted into the filter element, a blocking screen assembly is arranged at the front end of an air channel of the air outlet, and cooling systems are further arranged at the two ends of the shell respectively. According to the utility model, the halogen gas required by the high-temperature purification furnace can be obtained by decomposing the five-poison cheap raw material gas.

The application is suitable for the technical field of crucible furnace, and provides a graphite crucible for carbonizing lithium battery negative electrode material, which comprises two furnace bodies with furnace covers, a crucible and a heating mechanism arranged in the inner cavities of the furnace bodies, and the inner cavities of the two furnace bodies are communicated through two flow guide pipes, and an air extractor is installed on each flow guide pipe, a guide frame is arranged between the inner walls of the furnace bodies and the outer surface of the heating mechanism, two air ducts penetrating through the furnace bodies and communicated with the inner cavities of the furnace bodies are arranged on the furnace bodies, and the air duct at the bottom of one side of one furnace body is communicated with the air duct at the top of one side of the other furnace body through the flow guide pipe.The application realizes the circulation of hot air between the heated furnace body and the unheated furnace body by the flow guide pipe and the air extractor, effectively transfers the waste heat in the cavity of the heated furnace body to the unheated furnace body, preheats the negative electrode material in the unheated furnace body, significantly reduces the power consumption, improves the overall energy utilization rate, and realizes the recycling of the hot air between the two furnace bodies, reduces the heat loss, and greatly improves the utilization efficiency of unit energy.

The invention discloses a device for automatically spraying a graphite crucible mold cavity release agent and automatically shaping raw materials in a mold cavity. According to the device, a chain plate type conveyor is used for conveying a graphite crucible mold, a transverse hydraulic cylinder pushes a Z-shaped support to enable a vertical hydraulic cylinder and the mold to be coaxial, and the vertical hydraulic cylinder drives a motor box to ascend and descend. The water pump extracts the release agent from the release agent container, and the release agent is distributed to the multiple nozzles through the annular pipe and the manifold and evenly sprayed into the mold. And then the raw materials are fed, the vertical hydraulic cylinder is pressed downwards again, the servo gear motor in the motor box drives the blades to rotate, the raw materials are flattened and shaped in the pressing-down process, and it is guaranteed that the raw materials are evenly distributed. A bearing is arranged in a through hole in the bottom of the motor box to guarantee stable rotation of a motor output shaft, and gaps are reserved between the blades and the fixing disc to avoid interference. In addition, the device is further provided with a liquid level sensor, the liquid level of the release agent can be monitored in real time, timely liquid supplementing is facilitated, and it is guaranteed that the production process is conducted stably and efficiently.

The utility model discloses a graphite crucible negative oxygen combustion gas tunnel kiln which comprises a tunnel kiln outer frame, installation columns are installed on the periphery of the lower end of the tunnel kiln outer frame, the tunnel kiln outer frame comprises a material base layer, an inner heat preservation layer is arranged on the inner surface of the material base layer, and a fireproof layer is arranged on the inner surface of the inner heat preservation layer. According to the tunnel kiln outer frame, due to the arrangement of the inner heat preservation layer, the heat conductivity coefficient is low, the high temperature resistance is good, heat loss can be effectively reduced, the good heat preservation effect on the tunnel kiln outer frame is achieved, the sealing performance of the tunnel kiln outer frame is guaranteed, and heat loss is prevented; the tunnel kiln outer frame has the primary function of reducing chemical erosion and mechanical abrasion of high-temperature gas and materials to the tunnel kiln outer frame, so that the tunnel kiln outer frame is protected, a part of heat is absorbed from the gas, the heat is transmitted to the materials in different conduction and radiation modes, the heat serves as a heat transfer medium, and a good heat preservation effect on the tunnel kiln can be achieved.

The invention discloses a novel combined graphite crucible for growth of 12-inch silicon carbide single crystals, which comprises an upper heating electrode, a middle heat preservation structure and an upper heater, and is characterized in that the middle heat preservation structure comprises a first middle heat preservation structure, a through hole is formed in the middle of the heat preservation top, a graphite rod is inserted into the heat preservation top, and a crucible cover is in threaded connection with the lower part of the graphite rod; a crucible barrel is in threaded connection with the lower portion of the crucible cover, a crystallization ring is arranged in the crucible barrel, a support is arranged above the crystallization ring, a graphite support is arranged above the support, a pressing ring is arranged below the crystallization ring, a backing ring is arranged below the pressing ring, and the backing ring is located on the crucible bottom. The crucible structure with high density and low porosity is manufactured by adopting an isostatic pressing process, so that the service life of the crucible can be prolonged, and the stability of the crucible can be improved; and a combined crucible structure is adopted, so that the use cost of the crucible can be reduced, the service life is prolonged, and the crystal quality can be improved by regularly replacing part of components.

This invention belongs to the field of vapor deposition technology, specifically a plasma-arc chemical vapor deposition (CVD) apparatus and its application. It includes a base plate, a support fixedly mounted on top of the base plate, a reaction chamber mounted on the support, an anode graphite crucible fixedly mounted inside the reaction chamber, an anode metal contained inside the anode graphite crucible, an evaporation chamber inside the reaction chamber, a CVD growth chamber inside the reaction chamber, and a hollow graphite cathode fixedly mounted inside the reaction chamber. This plasma-arc chemical vapor deposition (CVD) apparatus and its application utilize a V-shaped connection between the evaporation chamber and the CVD growth chamber. The catalyst generated by the plasma arc evaporating on the anode metal surface is reflected and rapidly enters the CVD growth chamber, avoiding particle growth and deactivation during transport and preventing the significant negative impact of complex carbon source gas in the subsequent CVD chamber on arc stability, thereby improving catalyst utilization and reaction efficiency.

The invention discloses a grinding mechanism for graphite products, which is provided with a rotatable first swing rod and a rotatable second swing rod, the first swing rod and the second swing rod form an X shape, the center of the X shape is positioned right above the central axis of a graphite crucible, and the first swing rod and the second swing rod are pulled by a third telescopic piece to swing synchronously; the ends of the two grinding columns are close to and away from each other to press the graphite crucible on the supporting roller, the graphite crucible is pushed to rotate through the driving assembly, and finally the four grinding columns synchronously grind and repair the outer surface and the inner surface of the graphite crucible correspondingly, so that the inner wall surface and the outer wall surface of the graphite crucible are kept flat and smooth, and the wall body is uniform. Uniform heating is also ensured, and stable heating efficiency is ensured; and a long grinding plate, a center grinding block and a circular grinding plate are further arranged, the outer end face, the inner end face and the open end face are ground and repaired, all-directional synchronous grinding of the graphite crucible is achieved, and the overall flatness and smoothness of the graphite crucible are guaranteed.

The application relates to a high-strength erosion-resistant Al4O4C-based composite material and a preparation method thereof. The technical scheme is as follows: part of a tempering agent is added into carbon aluminum oxide powder, mixed, and then the rest of the tempering agent and yttrium oxide powder are added to obtain mixed powder. The mixed powder, anhydrous ethanol and ball milling beads are placed in a ball mill to obtain mixed slurry; the mixed slurry is dried and ground to obtain ground material; the ground material and a binding agent are mixed, pre-pressed and cold isostatic pressed to obtain a composite material preform; then drying and curing are carried out, glue removal is carried out in an atmosphere protection furnace, finally, the obtained composite material blank is placed in a graphite crucible and placed in a high-temperature atmosphere sintering furnace to be heated, kept and cooled to obtain the high-strength erosion-resistant Al4O4C-based composite material. The high-strength erosion-resistant Al4O4C-based composite material prepared by the application has the characteristics of excellent erosion resistance and good mechanical properties, and can meet the requirements of materials for preparing crucibles for vacuum induction melting high-temperature alloys.

The utility model discloses a molten salt electrolytic furnace with a rotating cathode. The molten salt electrolytic furnace comprises a mounting frame, a furnace body, a graphite crucible, a furnace cover, an exhaust pipe, a motor, a cathode guide rod, a cathode carbon block, a screw rod, a sliding rail and an adjusting seat, compared with the prior art, the graphite crucible is used as the anode, so that the cost is reduced, and the service life is prolonged; the driving device drives the cathode to rotate, so that the passivation layer is prevented from being formed, the electrolysis efficiency is improved, the electrolyte is promoted to flow, and local overheating is prevented.

This invention discloses a perovskite-type high-entropy ceramic material, its preparation method, and its application. The preparation method of the perovskite-type high-entropy ceramic material of this invention includes the following steps: 1) mixing A-site oxide powder and B-site oxide powder and wet ball milling, followed by drying and grinding to obtain a mixed powder; 2) adding the mixed powder into a graphite crucible and compacting it, then subjecting it to laser radiation heating to obtain the perovskite-type high-entropy ceramic material. The perovskite-type high-entropy ceramic material of this invention exhibits multi-band absorption characteristics, high service temperature, and stable performance at high temperatures, making it suitable for use in stealth coatings for aerospace vehicles. Furthermore, its preparation method is simple, with a short reaction time and low production cost, making it suitable for large-scale industrial production and application.

The invention discloses a method for preparing metal zinc through molten salt electrolysis in the technical field of molten salt electrolysis, and aims to solve the technical problems of high energy consumption, serious pollution, complex zinc hydrometallurgy process and heavy environmental load of traditional pyrometallurgical zinc. The method comprises the following steps: by taking mixed molten salt consisting of two or three of zinc sulfide and zinc sulfide as an electrolyte, taking zinc sulfide as a raw material, adding flaky sodium sulfide and 1 # lead to optimize an electrolysis system, carrying out constant-voltage electrolysis at 600-720 DEG C and 3.2-4.0 V by taking a graphite crucible as a cathode and a graphite rod as an anode under the protection of inert gas, and separating by utilizing density difference to obtain metal zinc. The method is short in process and high in efficiency, does not need complicated steps such as roasting, leaching and purifying, obviously reduces energy consumption, does not generate a large amount of waste liquid and residues, is outstanding in environmental protection property, and provides a green and efficient new scheme for the zinc smelting industry.

This invention provides an apparatus and method for liquid-phase growth of SiC crystals. The apparatus includes a graphite crucible and a seed crystal fixing mechanism. The inner wall of the graphite crucible is covered with a ring-shaped tantalum carbide coating circumferentially surrounding its inner wall. This ring-shaped tantalum carbide coating is located in the expected fluctuation region of the melt surface during crystal growth. This invention utilizes the excellent wettability and chemical stability of tantalum carbide with silicon-based melts to fundamentally solve problems such as instability of the liquid surface, uneven distribution of the thermal and solute fields, uneven crucible corrosion, and heterogeneous nucleation on the sidewalls caused by poor wettability between the melt and the graphite crucible. This method can significantly stabilize the growth interface, improve the stability and repeatability of crystal growth, and ultimately obtain SiC crystals with higher crystal quality and lower defect density.

The present invention relates to an ultra-high purity oxygen-free copper, and a preparation method therefor. In the preparation method, first, cathode copper is added to a graphite crucible of an electric vacuum high-temperature purification furnace, to be melted into liquid copper; next, after the liquid copper is left to stand and maintain temperature, a heating cover of the electric vacuum high-temperature purification furnace is slowly lifted upwards, and the liquid copper in the graphite crucible slowly solidifies from the bottom until the solution is completely solidified; then, the solidified ingot is removed, both ends of the ingot are cut off, and the ingot remaining after cutting repeats the previous two steps. After 3-5 cycles, an ultra-high purity oxygen-free copper ingot is obtained. The prepared ultra-high purity oxygen-free copper has a purity of 5N-6N, an oxygen content of less than 2 ppm, and a hydrogen content of less than 1 ppm. The present invention has simple and reliable operation, and can control preparation of ingots having different copper contents according to different application directions; in addition, due to the extremely low gas content and good compactness of the ingots, the oxygen content is also controlled at an extremely low level.

The utility model belongs to the field of graphite crucible processing, and discloses an anti-falling piece processing device which comprises a crucible and a hoisting rod, a cross-shaped groove is formed in the bottom end of the hoisting rod, a guide rod is fixedly installed in the center of the cross-shaped groove, and a sliding groove is formed in the position, located in the middle of the cross-shaped groove, of the outer wall of the hoisting rod. A second thread is integrally formed at the top end of the hoisting rod, a first thread is integrally formed in the position, below the second thread, of the outer wall of the hoisting rod, a lifting assembly is installed on the surface of the first thread in a threaded mode, and an anti-disengaging assembly is installed on the surface of the second thread in a threaded mode. According to the crucible anti-falling device, the contact panel can be better attached to the inner wall of the crucible, the clamping and fixing effect is improved, then the anti-falling effect is improved, the scale diameter range of the contact panel can be adjusted in a large area through cooperative adjustment of the lifting assembly and the anti-falling assembly, therefore, the overall hoisting meets the anti-falling requirements of more crucibles of different specifications, and the practicability of the device is improved.

The present application relates to the technical field of carbon composite materials, and particularly relates to a preparation method of a composite graphite crucible for sintering of a lithium iron manganese phosphate positive electrode material. The present application aims to solve the problems of poor thermal conductivity, easy thermal shock cracking and high-temperature deformation of traditional refractory castable crucibles. In the method, silica anchor points are constructed on the surface of dopamine site-modified single-walled carbon nanotubes and terminated with silane, and then the silica anchor points are compounded with phenolic resin and boric acid. Finally, the mixture is kneaded, hot-pressed and carbonized in batches with flake graphite of a specific particle size. The prepared composite graphite crucible significantly improves the thermal conductivity, structural stability and thermal shock resistance, optimizes the microstructure uniformity, thereby effectively reducing the sintering energy consumption and greatly prolonging the service life of the crucible in continuous production.

The application discloses a kind of fused cast beta-corundum brick and preparation method thereof, belong to refractory material technical field.The fused cast beta-corundum brick is prepared by Ni (NO3) 26H2O, Co (NO3) 26H2O, alpha-Al2O3, Na2CO3 as raw material, by fusion casting method;Preparation steps include: preparation Ni (NO3) 26H2O and Co (NO3) 26H2O composite salt solution and infiltrate alpha-Al2O3 with Na2CO3 powder, by spray drying, ball milling, screening and obtain mixed powder;Preheat high-purity graphite crucible after charging, high-purity argon is imported, stage heating is kept to 1950-2050 DEG C, pouring is kept to preheating mould, finally cooling annealing and with furnace cooling to room temperature and obtain fused cast beta-corundum brick.The fused cast beta-corundum brick prepared by optimizing raw material ratio, fusion casting and annealing process parameters is stable in performance, preparation method process controllable, good repeatability, with good application prospect.

The invention provides a preparation device of a single-walled carbon nanotube. The preparation device of the single-walled carbon nanotube comprises a hearth with an auxiliary heating system; the graphite crucible anode pool is mounted at the bottom of the inner wall of the hearth with the auxiliary heating system, and a fence is mounted at the top of the graphite crucible anode pool. According to the preparation device of the single-walled carbon nanotube, the graphite crucible anode pool is heated by the electric arc to form a stable high-temperature environment through the design, the problem of electric sparks caused by discontinuous electric arc is avoided, the temperature is maintained by a single electric arc gas in a conventional plasma method, and if a carbon source gas is introduced into a hearth, a flow field in a cavity is changed, so that the single-walled carbon nanotube is prepared. The arc striking gas is easy to be impacted and disordered, the metal anode pool is added, the stability of the temperature of the cavity is obviously improved, the safety and continuity of the reaction are greatly improved, and the fence is added around the graphite crucible anode pool, so that the problem that metal catalyst steam evaporated at high temperature is insufficiently contacted with a carbon source is avoided.

This invention relates to the field of graphite product demolding technology, and discloses a rapid demolding device and method for graphite crucible production. The device includes a top plate, a lifting mechanism, a connecting plate, a disc, a clamping mechanism, a pressure sensor, and an outer auxiliary mechanism. A clamping cylinder drives an arc-shaped clamping strip to contact the inner wall of the crucible, and the pressure sensor monitors the pressure in real time to prevent damage to the crucible. Flexible spheres on the inner side of the outer arc-shaped plate roll to reduce friction, assisting in demolding. This invention significantly improves demolding efficiency and effectively protects the crucible, is suitable for the production of graphite crucibles of various specifications, and has broad application prospects.