54results about How to "Inhibit production" patented technology

According to the high-precision tension control system for the solar cell backboard coating line, high-precision tension control is achieved based on an SINAMICS 120 servo dragging system, a Siemens S7-300 series PLC is adopted as a control core, a PROFIBUS-DP field bus communication network is established, CPU317-2DP serves as a master station, a field remote IO module and a CU320 driving unit serve as slave stations, and the high-precision tension control system for the solar cell backboard coating line achieves high-precision tension control. An industrial personal computer is used as a man-machine interaction medium, normal operation of the whole production line is achieved by setting tension and production speed, tension control is performed in a mode of combining a floating roller and a high-sensitivity tension sensor, a high-precision servo system S120 is used for dragging, high-precision control of tension is achieved, and actual operation of the system shows that the production efficiency is greatly improved. Compared with a traditional tension control system, the system has the advantages of being stable in tension control, high in precision, stable in production speed, friendly in man-machine, capable of achieving non-stop roll changing and capable of completely meeting the requirement for continuous production of the back plate.

The invention discloses a preparation method of a lithium ion battery electrolyte, and relates to the technical field of lithium ion battery electrolytes.The preparation method comprises the following steps that S1, single organic solvents, namely diethyl fluoromalonate, fluoroethylene carbonate and dimethyl carbonate are taken and mixed in proportion, and a mixed organic solvent is prepared; s2, preparing a composite lithium salt; and S3, the mixed organic solvent, the composite lithium salt and an additive are taken in proportion and mixed, the lithium ion battery electrolyte is prepared, and the additive is a sulfonate compound and a fluorine-containing sulfonamide compound. According to the invention, by adding the sulfonate compound and the fluorine-containing sulfonamide compound additive, a stable, uniform and thin interfacial film can be formed, the stability of CEI and SEI films can be improved, and the positive and negative electrode materials of the battery can be protected; and the freezing point of the organic solvent is reduced while the ionic conductivity under the high-temperature condition is improved, so that the low-temperature effect of the electrolyte is improved, and the lithium ion battery electrolyte has a wider temperature range.

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 utility model provides a system for producing vinyl chloride through oxychlorination, and belongs to the field of vinyl chloride synthesis. According to the system for producing vinyl chloride through oxychlorination, dichloroethane is prepared through the oxychlorination reaction unit, then the dichloroethane is refined through the refining unit, then the refined dichloroethane is cracked in the cracking unit to prepare vinyl chloride, and finally the vinyl chloride is obtained through purification in the vinyl chloride refining unit. Dichloroethane is prepared through a direct chlorination reaction unit, so that the yield of dichloroethane is increased, and a raw material is provided for cracking of dichloroethane; according to the system for producing vinyl chloride through oxychlorination, dichloroethane is prepared through the oxychlorination reaction unit and the direct chlorination unit, so that the working efficiency of the system is improved.

The invention relates to the technical field of warp knitting machine control, in particular to a carbon fiber warp knitting machine operation method based on the Internet of Things, which comprises the following steps: determining a knitting control state of a warp knitting machine, determining an initial knitting speed and matching a traction speed according to the initial knitting speed; determining a central area and an edge area of the braided fabric according to the raw material diameter of the carbon fiber raw material and the target fabric density; determining the motion trails of the warp knitting needle and the sinker in the knitting process so as to determine the equipment characterization state of the warp knitting machine; determining whether the warp knitting machine acquires a surface image of the braided fabric or not according to the equipment characterization state; acquiring a surface image of the braided fabric at each preset time node to determine a density characterization trend of the braided fabric; determining an operation characterization trend according to the density characterization trend to determine whether to adjust the initial knitting speed; according to the center flat state and the fabric edge state, the operation characterization trend is secondarily determined so as to determine whether to adjust the traction speed or not. Therefore, linkage among links of monitoring equipment, controlling the quality of braided fabric and optimizing the production process is realized.

The invention relates to a method for encrypting and decrypting a false tooth processing program in a numerical control system, which comprises the following steps of: importing a file required to be processed and processing equipment, and setting preparation information; the processing equipment communicates with the central control program; generating a string of encrypted information through an advanced encryption standard algorithm; embedding the encrypted information into a processing program, and encrypting the encrypted information together with the processing program; decrypting the encrypted information in the processing program; and comparing the equipment number of the inspection machine with the machine type configuration. The invention further relates to a device for encrypting and decrypting the false tooth machining program in the numerical control system, a processor and a computer readable storage medium of the processor. By adopting the method and the device for encrypting and decrypting the false tooth processing program in the numerical control system, the processor and the computer readable storage medium thereof, the management of the program, a product and equipment is facilitated, the situation that the program is mistakenly used is reduced, other people can be prevented from embezzling the program for production on other equipment, and the production efficiency is improved. And the safety of the program is ensured while the processing automation is realized.

The invention relates to the technical field of steelmaking. The invention relates to a preheating method, in particular to an environment-friendly waste steel preheating method and system. Aiming at the problem that dioxin can be generated in an existing waste steel preheating technology, the environment-friendly waste steel preheating method and system are provided, greenization of an electric furnace is promoted, waste heat utilization of flue gas of the electric furnace and green preheating of waste steel are achieved, and greenization and efficient smelting of the flue gas of the electric furnace are achieved at the same time.

The invention discloses a production process of an anti-fouling polyester fiber, and belongs to the technical field of textile fiber preparation, and the production process comprises the following steps: step S1, synergistically modifying graphene oxide and low-surface-energy organic silicon to carry out hydrophobic finishing on the polyester fiber to obtain a modified fiber; and S2, adding the modified fibers into absolute ethyl alcohol, stirring and dispersing, adjusting the pH value to 7.8-8.2 by using ammonia water, adding the modified nano microspheres, and stirring and reacting for 0.5-1 hour to obtain the anti-fouling polyester fibers. A layer of compact low-surface-energy cross-linked network and a microcosmic nanoscale coarse structure are constructed on the surface of the polyester fiber, the anti-fouling performance of the polyester fiber is effectively improved, a pH response type antibacterial structure is directly introduced into the nanometer coarse structure on the basis, a good antibacterial effect can be achieved without additionally adding an antibacterial material, and the anti-fouling performance of the polyester fiber is effectively improved. The production of bacterial biofilms is avoided, and the bacterial pollution resistance of the polyester fibers is improved.

An object of the present invention is to provide a double-stranded RNA that is useful as a novel anti-hepatitis B virus agent, and a pharmaceutical composition containing the above-described double-stranded RNA. According to the present invention, there is provided a double-stranded RNA that inhibits the production of a hepatitis B virus protein and that inhibits the expression of YTHDC1.

The utility model discloses an adjustable plastic bucket wall thickness control device, which relates to the technical field of plastic bucket production, and comprises a base, a conveying device is arranged on the base, a clamping groove is arranged on the conveying device, a mould is arranged in the clamping groove, the mould is connected with a storage tank, a nozzle is arranged on the storage tank, the nozzle is provided with a small nozzle, and the small nozzle is connected with the storage tank. A flat opening is installed on the small nozzle, and a control panel is installed on the side face of the nozzle. According to the utility model, the control panel is mounted, so that the injection speed can be flexibly adjusted, the product quality and consistency are improved, the production of unqualified products is avoided, and the production interruption is reduced; by installing the infrared detection device, abnormal conditions occurring in the production process can be rapidly recognized and processed, so that the risk of producing unqualified products is avoided, and the production efficiency and consistency are greatly improved; and an alarm is installed, so that an operator can take corresponding measures in time, and problems in the production process are avoided.

The invention relates to the technical field of cylindrical grinding machines, in particular to an automatic detecting and screening centerless grinding device which comprises a grinding machine body, a left vertical seat and a right vertical seat are arranged at the top of the grinding machine body, a guide wheel is mounted on the left vertical seat, and a grinding wheel is mounted on the right vertical seat. A first hopper located below the guide wheel and the grinding wheel is fixed between the two vertical seats, and a supporting frame is fixed to the first hopper. In the prior art, the outer diameter tolerance of the grinding rod is detected manually, the efficiency is low, errors are easy to occur, high-precision products highly depend on personnel, the outer diameter tolerance of the grinding rod can be detected continuously, the detection error is low, an alarm is automatically given out for unqualified products, and production of the defective products is avoided. The structure that the laser detection equipment is connected with the discharge port of the grinding machine is adopted, so that the outer diameter tolerance detection of the grinding rod can be continuous, the detection error is low, and an automatic alarm is given for unqualified products, so that the manpower is saved, the product precision is improved, and the production of the defective products is avoided.

This utility model relates to the field of steel wire production technology, and in particular to a broken wire identification device for cutting steel wire. It includes an operating table, a rotating mechanism fixedly installed on one side of the operating table, and a sleeve mechanism slidably connected to the inner side of the rotating mechanism. The rotating mechanism includes a grooved wheel with a sliding groove on its inner side. A spring is fixedly connected to the inner side of the grooved wheel, and a core is fixedly connected to the inner side of the spring. A fixing rivet is fixedly inserted through the inner side of the core. The sleeve mechanism includes a curved tube with a pull ring welded to its outer side and a sliding block welded to its outer side. A pressing assembly is fixedly connected to the inner side of the curved tube, and a clamping assembly is bonded to one end of the curved tube. The pressing assembly includes a curved rod with a connecting spring welded to its outer side. In this utility model, the sleeve mechanism enables precise dual identification of broken wires and surface defects during steel wire production, allowing the device to promptly report broken wires, intercept steel wires with quality defects, and avoid the production of substandard products.

The present invention provides a fabric with high resilience, a processing device and a preparation method, and relates to the field of textile technology. The processing device for the fabric with high resilience, the fabric with high resilience is obtained by interweaving an upper fabric and a lower fabric, then retreating with hot water and drying. In the present invention, after retreating, the first inner weft and the first outer weft become thinner, and the second outer weft and the second inner weft are retreated, so that the remaining warp yarn and weft yarn in the fabric structure have a higher buckling rate, and the fabric has better fluffiness, drape and elasticity. The cross-sectional shape of the water-soluble vinyl fiber is set to an octagonal star shape, so that coarser fibers can be obtained with less raw materials, making the fabric fluffier. By setting a pressure detection component in conjunction with a valve component, the filter screen can be found to be blocked in time, and the group of channels can be closed in time by the valve component to avoid the production of a large number of defective products. The alarm of the controller can remind the staff to perform maintenance in time.

The present application discloses a control system for a self-service beverage machine based on the Internet of Things, which relates to the field of equipment control technology, including a display layer, a control layer and a drive layer. The control layer includes a data acquisition module, a data preprocessing module, an instruction receiving module, an instruction weight calculation module, a system efficiency analysis module, a temperature adjustment module, a liquid level adjustment module, an optimization evaluation module, an optimization early warning module and a control module. By providing an instruction weight calculation module and a system efficiency analysis module, the instruction weights of each time period are calculated to obtain the instruction weight factors of each time period, so that the calculation of the system efficiency coefficient is more accurate. The system efficiency analysis is performed in combination with target data to obtain the system efficiency coefficient. The system is automatically optimized through the optimization evaluation of the system efficiency coefficient to prevent the problem of increased response time of the self-service beverage machine as the use time increases, thereby improving system efficiency and enhancing user experience.

The invention relates to a method and device for generating analog signal data, computer equipment and a storage medium. The method comprises the following steps: acquiring a frequency parameter of actual signal data acquired by a sensor; acquiring signal rule information required by signal verification; generating analog signal data based on the frequency parameter and the signal rule information; wherein the analog signal data is used for replacing the actual signal data to perform signal verification. By adopting the method, the consumption of manpower and material resources can be reduced.

The application provides a preparation method of 4-(hydroxymethyl phosphono)-2-carbonyl butyric acid, comprising the following steps: a) mixing methyl phosphonate diester, carboxylic acid and acryloyl cyanide to perform an addition reaction, and obtaining (3-cyano-3-carbonyl propyl) methyl phosphonate liquor after reduced pressure distillation; b) uniformly mixing the (3-cyano-3-carbonyl propyl) methyl phosphonate liquor obtained in step a) with water, cooling to 10-40 DEG C, then adding hydrochloric acid dropwise to perform acidification, continuing to stir for 0.1-1 h after the dropwise addition is completed, then performing a hydrolysis reaction, and finally performing purification treatment to obtain 4-(hydroxymethyl phosphono)-2-carbonyl butyric acid. Compared with the prior art, the preparation method provided by the application does not need to perform a cyanation reaction, avoids the use of high-cost, hard-to-obtain cyclic phosphonic anhydride and the highly toxic sodium cyanide; and the preparation method has short process steps, the raw materials are widely sourced and low in cost, the reaction conditions are mild, and the element comprehensive utilization rate is high.

The present invention relates to a process for the co-production of p-phenylenediamine and isopropanol, wherein p-nitroaniline and acetone are used as raw materials, water is used as a supplementary solvent, a tubular reactor is used, a Ni-based catalyst is used for reduction reaction, and the products are separated by azeotropic distillation and recrystallization to obtain p-nitroaniline and isopropanol that meet the purity standard. The technical scheme adopts a tubular process for the co-production of p-nitroaniline and isopropanol by hydrogen reduction of p-nitroaniline and acetone under the action of a catalyst, and the process can reduce the amount of solvent used, while improving the utilization rate of the device and the economic value of the product; the process can achieve a p-nitroaniline conversion rate of ≥95.0%, a p-phenylenediamine selectivity of ≥98.0%, an acetone conversion rate of ≥95.0%, and an isopropanol selectivity of ≥99.9%.

An IRAK4 degradation agent as represented by structural formula PTM-L-ULM (I), and a preparation method therefor and the use thereof. The provided compound can effectively inhibit and / or degrade IRAK4 kinase protein in a cell and inhibit an immune cell from producing IL-6.

The utility model relates to the technical field of coil stock processing, in particular to a winding machine which comprises a machine frame, a winding roller is arranged on the machine frame, a groove extending in the axis direction of the winding roller is formed in the winding roller, limiting plates are arranged at the two ends of the winding roller in a sleeved mode, limiting protrusions are arranged on the inner circumferential walls of the limiting plates, and the limiting protrusions are arranged on the inner circumferential walls of the limiting plates. The limiting protrusions are matched with the grooves to enable the baffles to be limited on the winding roller in the circumferential direction, guide slopes are arranged on the end faces of the opposite ends of the two limiting plates, and limiting rings are arranged at the other ends of the limiting plates. The problems that in the production process, a baffle arranged on a winding roller abrades a product, and the attractiveness and quality of the product are affected can be solved.

The present application relates to the technical field of flow distribution disc, and particularly relates to a high-pressure flow distribution disc three-section flow groove anti-cavitation structure, which comprises a flow distribution disc, the flow distribution disc comprises two centrally-symmetrically arranged large waist-shaped grooves, small waist-shaped grooves are symmetrically arranged on the two sides of the large waist-shaped grooves, the small waist-shaped grooves are arranged through the flow distribution disc, three-section flow grooves and a second single-section flow groove are respectively arranged at the two ends of the large waist-shaped grooves, and the two three-section flow grooves are centrally symmetrically arranged; the three-section flow groove comprises three triangular grooves which are completely identical in structure, the three triangular grooves are arranged at equal intervals, and one end of a same circular-arc groove is communicated with the end portions of the three triangular grooves, and the other end of the circular-arc groove is communicated with the large waist-shaped groove. The present application can increase the flow area, reduce the jet velocity, weaken the influence of wall shear force, thereby inhibit vortex production, further inhibit cavitation phenomenon of the flow distribution disc of the axial plunger pump under high-pressure working condition, reduce flow pressure pulsation and cavitation, and improve the efficiency and service life of the axial plunger pump.

The present invention discloses a seawater electrolysis method, which is proposed to solve the problem that the chlorine evolution reaction (ClER) seriously affects the electrolysis efficiency of the oxygen evolution reaction (OER) and causes corrosion to the oxygen evolution electrode in the existing direct seawater electrolysis anode half process, and to solve the problem that the gas produced by the anode oxygen evolution reaction (OER) and chlorine evolution reaction (ClER) of the electrolytic cell and the cathode hydrogen evolution reaction (HER) process is seriously mixed. This method uses a two-step intermittent operation of seawater electroreduction hydrogen evolution and reversible auxiliary electrode thermal reduction, and performs the cathode hydrogen evolution reaction (HER) electrode process under the premise of suppressing the anode oxygen evolution reaction (OER) and chlorine evolution reaction (ClER) half reactions in the traditional direct seawater electrolysis, so that the electrolysis step mainly undergoes the hydrogen evolution reaction (HER), and high-purity hydrogen is produced from seawater.

The utility model discloses a water-jet loom convenient to maintain, which relates to the technical field of water-jet looms and comprises a machine body, the inside of the machine body is hollow, a plurality of guide rollers are arranged in the machine body, fabric is in transmission connection with the surfaces of the guide rollers, a plurality of sliding grooves are formed in the machine body, and the sliding grooves are communicated with the guide rollers. A sliding transverse rod is slidably connected into the sliding groove, and a protective door is fixedly connected to the surface of the sliding transverse rod. According to the water-jet loom convenient to maintain, when the check block does not stop the supporting rod any more, the check block needs to be synchronously pulled out to rotate on the other side, and the situation that when the machine runs, due to vibration, a rotating block on one side is disengaged from the check block, and the supporting rod is not stopped any more can be prevented; and meanwhile, impurities such as dust and flyings generated in the machine body can be effectively prevented from entering a workshop, and the cleaning difficulty is reduced.

The invention relates to the technical field of gas well natural gas hydrate prevention and control, in particular to a natural gas hydrate prevention and control system and method and a natural gas well. The natural gas hydrate prevention and control system comprises two flow meters, a tubular catalytic heater, an electric control valve, an emergency cut-off valve, a power supply device and a control device; production natural gas of a wellhead pipeline is heated, a gas well wellhead valve and the pipeline are prevented from being blocked, the pressure of the pipeline is ensured to be within a required pressure range, and the pressure of the pipeline is protected from being abnormal. The self energy of the natural gas is used as input energy, open fire operation is avoided by adopting a catalytic combustion technology, the heat exchange amount of the tubular heat exchanger is improved, the natural gas pipeline is prevented from being frozen and blocked, and the anti-freezing effect reaches 100%. Compared with a traditional natural gas anti-freezing and anti-blocking method, the method has the advantages of being small in occupied area, free of open fire operation and low in production cost. The problems of high energy consumption, high cost and poor control effect in the natural gas hydrate control process in the prior art are solved.

The utility model relates to the technical field of production of balance cement for motors, in particular to production equipment of balance cement for motors, which comprises a sleeve, a clamping groove is arranged at the bottom end of the sleeve and used for clamping and mounting the top end of a feeding hopper, and the top end of the sleeve is fixedly connected with the bottom end of a top plate. A driving motor is fixedly mounted at the top end of the top plate, the output end of the driving motor penetrates through the top plate and a sleeve to be fixedly connected with the top end of a corrugated rod, the corrugated rod is vertically arranged in the center of the interior of a feeding hopper and the center of the interior of a feeding pipe, and the bottom end of the feeding hopper is fixedly connected with the top end of the feeding pipe and internally communicates with the top end of the feeding pipe; and the bottom end of the feeding pipe is fixedly mounted at the top end of the plaster extruder main body. The sleeve is mounted on the feeding hopper, so that dust accumulation on the inner side of the feeding hopper can be avoided, the situation that raw materials and dust are brought into the plaster extruder main body for production during feeding is avoided, and the production quality of balance plaster is improved.

This invention provides a method for preparing 4-(hydroxymethylphosphono)-2-carbonylbutyric acid, comprising the following steps: a) mixing methylphosphonite diester, carboxylic acid, and acryloyl chloride, performing an addition reaction, and distilling under reduced pressure to obtain a (3-chloro-3-carbonylpropyl)methylphosphonate solution; b) mixing the (3-chloro-3-carbonylpropyl)methylphosphonate solution obtained in step a) with sodium cyanide, solvent, and catalyst, performing a substitution reaction, and purifying to obtain a (3-cyano-3-carbonylpropyl)methylphosphonate solution; c) mixing the (3-cyano-3-carbonylpropyl)methylphosphonate solution obtained in step b) with water, cooling to 10℃~40℃, adding hydrochloric acid dropwise for acidification, stirring for 0.1h~1h after the addition is complete, then performing a hydrolysis reaction, and finally purifying to obtain 4-(hydroxymethylphosphono)-2-carbonylbutyric acid. Compared with existing technologies, the preparation method provided by this invention has simple process steps, mild reaction conditions, and high comprehensive utilization rate of elements.

The present invention discloses a seawater electrolysis device, comprising a shell, a cathode and an anode arranged in the shell, wherein the cathode and the anode are connected to a power source outside the shell to form a path; the anode is a reversible electrode having a redox cycle characteristic through a change in the valence state of an active metal, and the cathode should be an electrode material having hydrogen evolution reaction (HER) activity, which is proposed to solve the problem that in the existing direct seawater electrolysis anode half process, the chlorine evolution reaction (ClER) seriously affects the electrolysis efficiency of the oxygen evolution reaction (OER) and causes corrosion to the oxygen evolution electrode, and to solve the problem that the gas production of the anode OER and ClER of the electrolytic cell and the cathode hydrogen evolution reaction (HER) process is seriously mixed. The present invention performs the cathode HER electrode process under the premise of suppressing the anode OER and ClER half reactions in the traditional direct seawater electrolysis, so that the electrolysis step mainly produces HER, and high-purity hydrogen is produced from seawater under the condition of avoiding serious corrosion of the anode ClER.

The utility model discloses an integrated high-heeled shoe with good smoothness and comfort, and particularly relates to the technical field of high-heeled shoes, the integrated high-heeled shoe comprises an integrated sole and an integrated vamp, the vamp and the sole are fixedly sewn together to improve the firmness of the vamp and the sole, the rear side of the bottom end of the sole is provided with a heel used for supporting the sole, and the heel is connected with the sole. An elastic band is fixedly sewn on the inner wall of an opening in the top of the vamp and used for improving tightness between the vamp and a sole. The high-heeled shoe is composed of the integrally-formed vamp, the integrally-formed sole and the integrally-formed heel, the strength of the high-heeled shoe can be improved, the tightness between the foot sole and the vamp and between the ankle and the vamp can be improved through the elastic band, meanwhile, the hard plastic can improve the pressure resistance of the front end of the vamp, the toes are protected, and when the toes make contact with the silica gel pad, the toes are not prone to falling off. And the section of the sole is arc-shaped, so that the toes can be prevented from being injured due to the fact that the toes extrude the front end of the vamp when the high-heeled shoes are worn.

The present invention relates to a composition for inhibiting biofilm comprising at least one selected from the group consisting of Lactobacillus rhamnosus, its culture medium, its extract and its cell-free supernatant and collagen hydrolysate. Although Lactobacillus rhamnosus can inhibit biofilm formation even as a single agent, the inhibitory ability is significantly increased when it is simultaneously treated with the collagen hydrolysate. The collagen hydrolysate inhibits acid production of Lactobacillus rhamnosus or Streptococcus mutans. Thus, the Lactobacillus rhamnosus and collagen hydrolysate can be usefully used as a composition for inhibiting the production of biofilms, in particular biofilms occurring in the oral cavity and a composition for preventing, alleviating, or treating oral diseases caused by the biofilms.

This invention belongs to the field of refractory materials technology, specifically relating to a spinel-graphite-metal composite material for core nozzles. First, a high-porosity resin-carbon bonded spinel-graphite preform is obtained by cold isostatic pressing followed by heat treatment in a protective atmosphere. Then, metallic silicon particles are used to embed the resin-carbon bonded spinel-graphite preform, which is then heat-treated in a vacuum sintering furnace. As metallic silicon permeates into the high-porosity resin-carbon bonded spinel-graphite preform, it continuously reacts with the resin-carbon and graphite, forming a dense silicon carbide layer from the surface to the interior, followed by a dense metallic silicon bonded spinel-graphite layer. With the formation of the dense silicon carbide layer on the surface, the permeation reaction ends, leaving a porous spinel-graphite layer in the core of the material. This invention avoids excessive thermal stress causing severe thermal shock that could lead to core nozzle fracture and failure, further optimizing the thermal shock resistance of the core nozzle.