23 results about "Sintering atmosphere" patented technology

The invention belongs to the technical field of heating bodies, and particularly relates to a preparation method of a porous LSMO heating body. The preparation method comprises the following steps: preparing a metal salt solution by using metal salt and a solvent; adding citric acid into the metal salt solution, and stirring to obtain complex sol; adding a PVA solution into the complex sol, adding or not adding the quantum dot dispersion liquid, and stirring to obtain a mixed solution; adding a pore-forming agent into the mixed solution, and carrying out ball-milling dispersion to obtain a precursor solution; and defoaming the precursor solution, adding a monomer, a cross-linking agent, an initiator and a catalyst, performing injection molding, and then performing drying, degreasing, low-temperature sintering and high-temperature sintering to obtain the porous LSMO heating element. The material disclosed by the invention can stably exist in a high-temperature sintering atmosphere, can be well compatible with an LSMO substrate, does not damage the integrity of a ceramic structure, and can improve the conductivity and the thermal response speed.

This invention provides a solar cell, its fabrication process, a tandem solar cell, and a photovoltaic module. The fabrication process of the solar cell includes: providing a cell substrate; printing a conductive material onto the cell substrate; and curing the conductive material to form initial grid lines. The conductive material includes bismuth-based lead-free glass; the conductive material also includes copper powder and nickel powder; the mass ratio of copper powder to nickel powder is 80~99.5:0.5~20, and the copper powder includes flake-shaped copper powder and spherical copper powder. In the fabrication process of this invention, the conductive material, through a ternary synergistic system of "copper-nickel-glass" and a dual-morphology copper powder composite design, achieves multiple effects such as suppressing copper diffusion and oxidation and improving adhesion under an air-sintering atmosphere, thereby improving the fill factor and photoelectric conversion efficiency of the solar cell.

A method for preparing an oxide sputtering target and a method for forming a transparent conductive oxide thin film are disclosed. The method for preparing the oxide sputtering target includes the following steps: obtaining a mixture comprising metal oxides; introducing the mixture into a sintering furnace; and sintering the mixture in the following manner: simultaneously heating the mixture by introducing oxygen into the sintering furnace at a first flow rate; simultaneously heating the mixture by introducing oxygen into the sintering furnace at a second flow rate; and simultaneously heating the mixture by introducing oxygen into the sintering furnace at a third flow rate. The metal oxides consist only of In₂O₃ and GeO₂. The first heating is performed until the sintering atmosphere reaches any temperature within the range of 1050°C to 1150°C, and the second heating is performed until the sintering atmosphere reaches any temperature within the range of 1200°C to 1300°C. The first and third flow rates are greater than the second flow rate.

A method of forming a monolithic article includes extruding an extrudable composition including a binder, inorganic particles, and graphite particles to form an extrudate, the extrudate including an outer skin and a core disposed within the outer skin; drying the extrudate; degreasing the extrudate in a degreasing atmosphere at one or more degreasing temperatures to remove the binder from the extrudate; and sintering the extrudate in a sintering atmosphere at one or more sintering temperatures to remove the graphite particles from the outer skin of the extrudate and sinter the inorganic particles of the extrudate, thereby forming the unitary article. The one or more degreasing temperatures are less than 650 DEG C. The one or more sintering temperatures are greater than or equal to 650 DEG C, and the oxygen concentration of the sintering atmosphere is less than or equal to 2.5%.

The application discloses a sintering method of a multilayer chip ceramic capacitor, which comprises the following steps: 1) placing a coated nickel net in a nitrogen atmosphere with an oxygen content of 10-100 ppm for oxidation treatment; 2) uniformly stacking and arranging ceramic blanks on the coated nickel net subjected to the oxidation treatment for degassing treatment; 3) transferring the ceramic blanks and the coated nickel net subjected to the degassing treatment as a whole into a tunnel furnace, then introducing nitrogen and hydrogen, and then controlling the oxygen content in the tunnel furnace for three-stage sintering, so as to obtain the multilayer chip ceramic capacitor. The sintering method of the multilayer chip ceramic capacitor does not cause the product performance degradation problem caused by poor sintering atmosphere uniformity, the service life of the coated nickel net is long, the electric performance and reliability of the obtained MLCC are good, and the method is suitable for large-scale popularization and application.

This invention discloses a preparation process for high-zircon content zircon bricks, belonging to the field of refractory materials technology. This process aims to solve the technical problem of the inability to achieve low-temperature full densification of zircon materials due to their easy decomposition at high temperatures during traditional sintering. The main steps include: firstly, preparing active zircon micropowder with high lattice strain energy through high-energy grinding; secondly, using heterogeneous agglomeration technology to coat the active micropowder onto the surface of inert coarse aggregate, constructing a "core-shell" structure granulated material; and finally, performing low-temperature solid-state sintering below the decomposition temperature, utilizing the distortion energy stored in the active micropowder to drive densification. This process simultaneously controls amorphization degree, Zeta potential, debinding oxidation, sintering atmosphere, and cooling regime. This invention successfully prepares high-density, high-strength, highly erosion-resistant, and glass-phase-free high-performance zircon bricks, suitable for harsh environments such as glass melting furnaces, while completely avoiding the thermal decomposition of zircon.

The application belongs to the technical field of hard alloy and particularly relates to high-performance hard alloy rod for woodworking knives and a preparation method thereof. x Complex carbide powder, spherical Co powder and carbonyl Ni powder; S2, mixing (W, Cr)C x carbide powder, spherical Co powder and carbonyl Ni powder are mixed, ball-milled and spray-dried to obtain mixed granules; S3, the mixed granules are loaded into a porous mold for vertical compression molding to obtain a hard alloy rod blank, and the hard alloy rod blank is sintered to obtain the hard alloy rod, and the sintering atmosphere is methane. The application improves the uniformity of the green compact density through the porous mold vertical compression molding process and the gradient carburizing sintering process, avoids the muscle edge cracks and abrasion loss caused by horizontal compression molding, and forms the binder phase distribution with a specific gradient structure through high-temperature carburizing sintering, thereby significantly improving the impact resistance, wear resistance and corrosion resistance of the material, and the material is suitable for high-speed, high-load and strong-vibration working conditions.

The application discloses a preparation method of a solid-state electrolyte, which comprises the following steps: adding a precursor of an excess of lithium element into a previously prepared solid-state electrolyte embryo, mixing the precursor with a solvent, and then performing ball milling treatment; drying the mixture obtained after the ball milling treatment; performing shaping on the mixture; and performing sintering on the shaped body in a sintering atmosphere containing an inert gas, so as to obtain the solid-state electrolyte; wherein the prepared solid-state electrolyte is a tantalum-doped garnet-type solid-state electrolyte. The solid-state electrolyte prepared by the method has high ionic conductivity, can improve the performance of a full battery, and is beneficial to the commercial application of a lithium metal solid-state battery.

This invention provides a solar cell, its fabrication process, a tandem solar cell, and a photovoltaic module. The fabrication process of the solar cell includes: providing a cell substrate; printing a conductive material onto the cell substrate; and curing the conductive material to form initial grid lines. The conductive material includes bismuth-based lead-free glass; the conductive material also includes copper powder and nickel powder; the mass ratio of copper powder to nickel powder is 80~99.5:0.5~20, and the copper powder includes flake-shaped copper powder and spherical copper powder. In the fabrication process of this invention, the conductive material, through a ternary synergistic system of "copper-nickel-glass" and a dual-morphology copper powder composite design, achieves multiple effects such as suppressing copper diffusion and oxidation and improving adhesion under an air-sintering atmosphere, thereby improving the fill factor and photoelectric conversion efficiency of the solar cell.

The application belongs to the technical field of sodium ion battery electrode materials, and particularly relates to a plasma-assisted regulated O3-type layered oxide positive electrode material and a preparation method and application thereof. The method is a high-temperature solid-phase sintering process in a plasma treatment atmosphere, and an O3-type layered oxide positive electrode material is obtained. The plasma treatment atmosphere is obtained by plasma treatment of a mixed gas containing nitrogen and oxygen. The sintering atmosphere is regulated by plasma assistance, and no additional post-cleaning or post-coating step is required. The in-situ optimization of the surface chemical state of the positive electrode material is realized, the surface residual alkali is effectively converted into a nitrate coating layer in-situ, the interface stability of the material is significantly improved, the rate performance and cycle stability are efficiently improved without changing the main structure, the process is simple, scalable, easy to repeat, efficient, and suitable for large-scale preparation of sodium ion battery positive electrode materials.

The application discloses a method and system for evaluating and comparing the influence of different gasification coarse slag pretreatment and sintering processes on the performance of thermal insulation bricks, and relates to the field of thermal insulation brick production, aiming to solve the problem that the understanding of how different pretreatment and sintering processes affect the performance of thermal insulation bricks and the inherent mechanism is not comprehensive when gasification coarse slag is used to prepare thermal insulation bricks, which limits the further application of gasification coarse slag in high value-added fields. The method prepares two thermal insulation brick samples with different processes, then compares and tests the macroscopic performance of the two samples and analyzes the microscopic structure and component mechanism, and finally explains how pickling pretreatment and / or composite sintering atmosphere affect the occurrence state, phase composition and microscopic structure of iron elements, and further cause differences in macroscopic performance based on the test results. The method has the advantages that the influence of different processes on the performance of thermal insulation bricks can be systematically evaluated, the correlation between microscopic mechanism and macroscopic performance can be further explained, and the resource utilization efficiency of gasification coarse slag can be optimized.

The invention provides a reducing atmosphere closed-loop regulation sintering system and method based on liquid precursor in-situ cracking, and relates to the technical field of photovoltaic cell manufacturing. The system comprises a raw material supply unit, a conveying unit, a vaporization unit, a sintering unit, an online monitoring unit and a control unit, a low-boiling-point liquid precursor is vaporized in the vaporization unit and then mixed with the inert carrier gas to form a gas-phase mixture, a silicon wafer printed with metal electrode slurry is sintered in a reducing atmosphere formed by the gas-phase mixture, and dynamic controllable adjustment of sintering atmosphere composition is achieved by monitoring gas components in exhausted gas in the sintering process in real time. Therefore, high-conductivity and low-contact-resistance sintering of the metal electrode is completed at a low sintering temperature. The system and the method can effectively reduce thermal and chemical damage to the silicon wafer in the sintering process, improve the stability and repeatability of the sintering process, are suitable for continuous and large-scale production, and are particularly suitable for low-temperature sintering application of a copper electrode.

The application discloses a preparation method of a superhigh-nickel high-cycle cobalt-free positive electrode material, and comprises the following steps: S1, a nickel source, a manganese source, a complexing agent and a precipitant are prepared into a reaction solution to perform a coprecipitation reaction, so that slurry is obtained; and centrifugation, washing and drying are performed to obtain nickel-manganese hydroxide; S2, the nickel-manganese hydroxide is uniformly mixed with a lithium source and a dopant to obtain a mixture, and first sintering is performed; the oxygen concentration in a sintering atmosphere is 86%-88%, and the sintering temperature is 650 DEG C-800 DEG C; S3, the sintered material is crushed, pickled and dried; and S4, the dried material is uniformly mixed with a coating agent, and second sintering is performed. The application adjusts the cationic disordering of the material and controls the cationic disordering degree within a certain range; the internal and external lattice distortions are relatively uniform; the cycle performance is good; the capacity attenuation is more uniform; and therefore, the cycle performance of the positive electrode material is optimal.

The application discloses a Ti-O electronic compound, a lithium-sulfur battery electrode material and a preparation method and application thereof, and belongs to the technical field of electrode material preparation. The preparation method is as follows: (1) uniformly mixing Ti powder and TiO2 powder according to the stoichiometric ratio of Ti and TiO2; (2) under the condition of 150-250 MPa, compressing the mixed powder obtained in the step (1) to obtain a sintered body; (3) wrapping the sintered body with Ti powder, and then performing high-temperature sintering, and cooling after the sintering is completed to obtain the Ti-O electronic compound. The application provides a simple preparation method for synthesizing the high-purity Ti-O electronic compound, and a lithium-sulfur battery positive electrode based on the Ti-O electronic compound as a catalytic carrier is prepared. By controlling key parameters such as powder particle size, compacted density, sintering atmosphere and temperature, the Ti-O electronic compound is realized to be embedded and sintered at high temperature to prepare a lithium-sulfur battery sulfur positive electrode with high rate performance.

The present application relates to a kind of lithium iron phosphate material, the lithium iron phosphate material has typical olivine structure, belongs to orthorhombic space group Pnma, the preparation method of the lithium iron phosphate material, comprising the following steps: (1) lithium carbonate of battery grade, boric acid, magnesium hydroxide are mixed uniformly according to certain proportion with iron phosphate, carbon source, wherein, n1 lithium carbonate: n2 iron phosphate is 1~1.02:1, the addition amount of carbon source is 10~15% of total weight, boric acid, magnesium hydroxide as additive, the content of boric acid, magnesium hydroxide is 0~2%, obtain mixture S1;(2) S1 is placed into fine grinder and is finely ground, speed 20~50r / min;Time 0.5~1h, obtain D50 particle size 0.5~0.6 μm mixed product S2;(3) S2 is sprayed in spraying equipment, obtain product S3, in roller hearth kiln sintering, sintering temperature is 650~800 DEG C, sintering atmosphere is inert gas, sintering time is 1~8h, obtain product as S4.By adding low melting point substance boric acid and magnesium hydroxide, it is conducive to sintering reaction LiFePO4 Crystal growth.

The present application discloses a furnace atmosphere control device and method. The furnace atmosphere control device includes an adjustment device, a sensor system, and a control unit. The exhaust unit in the adjustment device is configured with a cover plate, a connecting rod, a crank, and an actuator, wherein the connecting rod is used to push and pull the cover plate to move, changing the position of the cover plate, thereby changing the area of the outlet of the exhaust unit. The furnace atmosphere control device of the present application enables the sintering atmosphere within the calcination furnace to be maintained at a high oxygen concentration, and can maintain continuous fluctuations in furnace pressure, ensuring the calcination effect of the raw cathode materials. The furnace atmosphere control method of the present application achieves automatic and real-time adjustment, being safe and efficient.

The application discloses a perovskite thermistor material, a preparation method and application thereof. The perovskite thermistor material is prepared from barium carbonate, bismuth oxide, lead oxide, sodium carbonate and potassium carbonate as raw materials by a solid phase reaction method, and has a chemical formula of (Ba 1‑y Re y )(Bi 1‑x R x )O3. In the formula, Re=Pb, 0≤y≤0.1; R=Na, K, 0≤x≤0.15. The perovskite thermistor material has a single perovskite structure. The material can be sintered into a porcelain at a low temperature, and the oxygen vacancies can be effectively adjusted under different sintering atmospheres, so that the material constant and the resistivity of the thermistor ceramic can be significantly reduced, and the perovskite thermistor material can be used for measurement and control in a temperature range of 40-160K at a low temperature.

The invention belongs to the technical field of hydrogen evolution electrodes, and provides a hydrogen evolution cathode and a preparation method and application thereof. The preparation method comprises the following steps: repeatedly and sequentially coating a catalyst solution system and sintering on a nickel substrate to obtain a precursor; and placing the precursor in an inorganic alkali solution for electric activation to obtain the hydrogen evolution cathode, the catalyst solution system comprises a catalytic metal compound, hydrochloric acid and a solvent; the catalytic metal compound comprises one or more of a nickel compound, a cerium compound, a ruthenium compound, a molybdenum compound, a platinum compound and an iron compound; the sintering temperature independently ranges from 400 DEG C to 600 DEG C, the sintering time independently ranges from 10 min to 60 min, and the sintering atmosphere is air. According to the invention, the hydrogen evolution cathode with a composite nano structure is obtained on a nickel substrate through coating, sintering and electric activation. According to the prepared hydrogen evolution cathode, the binding force between the catalyst layer and the nickel substrate is high, and the service life is prolonged.

The present application belongs to the technical field of cermet, and particularly relates to a high-toughness cermet particle and a preparation method thereof, the particle being composed of a composite hard phase of ceramic micropowder, surface-modified ceramic powder and rare earth element carbonitride, dispersed in a metal matrix composed of multiple metal elements, and introducing a synergistic control component to optimize the interface bonding and the uniformity of the structure. The particle adopts a step-by-step heat treatment and isopressing forming process, and a stable structure is formed by controlling the oxygen content and the sintering atmosphere. The obtained material has high bending strength, high fracture toughness and good thermal shock stability, and is suitable for the application field of wear-resistant and crack-resistant under extreme working conditions, and has compact structure and mechanical stability.

This invention relates to the field of MnZn ferrite materials, and in particular to a high-temperature, low-loss MnZn ferrite material and its preparation method. The material comprises a main component and auxiliary components. The main component is Fe2O3, ZnO, and MnO. The auxiliary components include Nb2O5, ZrO2, TiO2, Co2O3, and at least one of CaCO3, SiO2, CuO, and Bi2O3. Simultaneously, a novel auxiliary component, BaTiO3, with a positive temperature coefficient of resistivity, is added. The Curie temperature of BaTiO3 is 80–120 °C, and its surface is coated with a nanoscale Al2O3 insulating layer to prevent the Ti⁴⁺ valence state change of BaTiO3 in the equilibrium oxygen partial pressure sintering atmosphere of MnZn ferrite. The MnZn ferrite material prepared by this method exhibits low-loss characteristics at high temperatures (150–160 °C).

The application discloses a system for realizing automatic loading and high flux of materials, which comprises a shell, a heating furnace, a quartz tube, a quartz crucible table, a quartz crucible and a power unit. The heating furnace is fixedly installed on the upper portion of the inner cavity of the shell through a support and extends upward and is embedded on the top wall of the shell. The quartz tube is horizontally installed in the furnace cavity of the heating furnace. The quartz tube extends to both sides and penetrates through the two side walls of the heating furnace and extends to the outer cavity of the heating furnace. The annular side wall of the quartz tube is fixedly sleeved with a first flange at one end, and the first flange seals the pipe opening of the quartz tube. The application has the advantages of reasonable design, novel structure, greatly improved automatic process of material sintering, greatly reduced labor consumption, 24-hour uninterrupted work, ensured stability of equipment work, greatly improved equipment work efficiency, ensured material sintering quality, simultaneously ensured precise control of the sintering atmosphere of the materials, and greatly improved reliability of the material sintering experiment.

The invention belongs to the technical field of sodium ion battery electrode materials, and particularly relates to a plasma-assisted regulation O3 type layered oxide positive electrode material and a preparation method and application thereof. According to the method, a high-temperature solid-phase sintering process is carried out in a plasma treatment atmosphere to obtain the plasma-assisted regulation O3 type layered oxide positive electrode material, and the plasma treatment atmosphere is obtained by carrying out plasma treatment on mixed gas containing nitrogen and oxygen. According to the method, the sintering atmosphere is regulated and controlled through plasma assistance, an additional post-cleaning or post-coating step is not needed, in-situ optimization of the chemical state of the surface of the positive electrode material is achieved, surface residual alkali is effectively converted into a nitrate coating layer in situ, and the interface stability of the material is remarkably improved; on the premise that the main body structure is not changed, the rate capability and the cycling stability are efficiently improved, and the process is simple, high in expandability, easy to repeat, high in efficiency and suitable for large-scale preparation of the sodium ion battery positive electrode material.

The invention relates to the technical field of materials, and particularly discloses nickel electrode slurry and a preparation method and application thereof. According to the application, nickel metal is taken as a main body, potassium sodium niobate mixed zirconium oxide is taken as a core layer, and MnO and CuO are used for coating treatment, so that the sintering shrinkage temperature and shrinkage rate of the nickel paste are adjusted, and good matching with lead-free low-temperature sintered piezoelectric ceramic is provided through co-firing; and the problems of cracking, discontinuity and the like caused by volatilization of potassium and sodium in the ceramic matrix due to over-high temperature and over-large shrinkage are avoided. The nickel electrode slurry provided by the invention can realize conversion of an electrode material in a piezoelectric ceramic element from noble metal to base metal, and can reduce the sintering temperature in a reduction sintering atmosphere to form good co-firing with a lead-free low-temperature sintered piezoelectric ceramic material.