7results about How to "Solving Manufacturing Challenges" patented technology

The present application relates to a kind of diamond / tantalum carbide composite material and its preparation method.The diamond / tantalum carbide composite material is made of tantalum carbide continuous phase and diamond grain randomly and uniformly embedded in tantalum carbide continuous phase, wherein the size of diamond grain is nanoscale, and its volume ratio is 1~3%.The present application also discloses a kind of method for preparing the above-mentioned diamond / tantalum carbide composite material, including high temperature and high pressure treatment to tantalum carbide powder in high temperature and high pressure synthesis device.Adopting the technical scheme of the present application, tantalum carbide powder is used as raw material, and composite material made of micron or submicron size tantalum carbide and nanoscale diamond can be prepared after high temperature and high pressure treatment.Compared with traditional tantalum carbide material, the hardness of the material is significantly improved, and has broad application prospect.

A method for one-step preparation of methylamine by hydrogenation amination of carbon dioxide, belonging to the field of catalysis. In a fixed-bed reactor, carbon dioxide, hydrogen, and ammonia are reacted. The catalyst comprises a microporous or mesoporous silica support, and the active component includes indium, zirconium, and at least one metal promoter selected from nickel, copper, palladium, rhodium, and platinum; the In 3d... 5 / 2 The binding energy is 444.0~444.7 eV, which is more than 0.2 eV lower than that of pure indium oxide; the single-pass conversion rate of carbon dioxide is not less than 50%, the total selectivity of methylamine is not less than 80%, and the selectivity of the byproduct carbon monoxide is not higher than 20%. This invention constructs a unique In-Zr-M active center, with In, Zr, and M uniformly co-distributed at the nanoscale. By adjusting the NH3 / CO2 ratio, the ratio of dimethylamine to trimethylamine can be controlled. The catalyst of this invention exhibits excellent performance and good stability, and has broad application prospects in the fields of carbon dioxide resource utilization and green synthesis of methylamine.

The present application relates to the technical field of filling coal mining, and particularly relates to a filling coal mining slurry bleeding rate testing and sample preparation test device and test method. The device comprises: a constraint cylinder, the side wall of which is a hollow structure; a flexible bleeding unit, which is attached to the inner side wall of the constraint cylinder; an inner lining structure, which is attached to the inner side wall of the flexible bleeding unit, and the inner lining structure is provided with a plurality of support platforms along the height direction; and a plurality of sample molds, which are arranged on the support platforms. The present application can simultaneously meet the needs of filling coal mining slurry bleeding rate testing and filling coal mining slurry standard sample preparation, effectively avoid the problems of sample height reduction and size not meeting the standards caused by water loss, accurately control the slurry form, ensure the formation of standard samples, and truly reflect the actual mechanical properties of the filling body. The sample height change before and after the slurry bleeding can be recorded in real time, and the volume of the slurry in the actual filling process can be quickly calculated.

This application relates to the field of solid rocket motor technology, and particularly to a method for integrated preparation and protection of solid rocket motor propellant grains based on a functional sacrificial core mold. The method includes: designing a high-burning-rate core mold assembly and an electrothermal heating assembly according to the propellant grain structural parameters; when the propellant grain length does not exceed a preset length threshold, the core mold is integrally formed using a mold method; otherwise, it is prepared in segments and connected via flanges; the electrothermal heating assembly is attached to the outer surface of the core mold using a high-temperature resistant adhesive, and a temperature sensor is fixed thereon, then the entire assembly is installed into the combustion chamber shell; an aluminum foil gasbag is placed inside the core mold cavity and filled with inert gas to ensure it adheres to the inner wall of the core mold; fluid propellant is injected into the cavity between the core mold and the shell through an injection port, followed by electrothermal heating to achieve isothermal curing; during storage and transportation, heating is continuously controlled to maintain the propellant grain temperature and prevent performance degradation. This method achieves integrated propellant grain forming and temperature-controlled protection, effectively improving process accuracy and storage reliability.

This utility model discloses a socket, including a housing, an inner bracket disposed within the housing, and neutral wire conductive plates, ground wire conductive plates, live wire conductive plates, and terminals disposed within the inner bracket. The inner bracket includes a lower bracket cover, a middle bracket, and an upper bracket cover. The middle bracket is disposed between the lower bracket cover and the upper bracket cover. The neutral wire conductive plate is located between the lower bracket cover and the middle bracket. The ground wire conductive plate is located between the lower bracket cover and the upper bracket cover and on one side of the middle bracket. The live wire conductive plate is located between the upper bracket cover and the middle bracket. The terminals are disposed on the lower bracket cover. The unique layered design of the inner bracket, combined with the layout of the conductive plates, effectively separates the conductive components. The addition of a protective door assembly greatly improves electrical safety. The inclined terminal block design not only ensures the stability of the electrical connection but also optimizes the wiring operation process, making it particularly suitable for installation scenarios with limited space or special angles.

The application provides a plasma discharge structure unit based on a multi-layer mica insulating plate for air disinfection, which is symmetrical in up-down and left-right directions and in a multi-layer stacking shape; from top to bottom, the structure unit comprises a front high-voltage electrode (10), an upper layer mica plate (20), a left grounding electrode (301), a right grounding electrode (302), a high-temperature-resistant insulating adhesive layer (40), a lower layer mica plate (50) and a back high-voltage electrode (60). The working process of the structure unit is also provided. The application proposes a sandwich type discharge structure, which can solve the manufacturing problem of a complex configuration plasma discharge device.

This invention discloses a method for preparing and applying a high fluorine-to-carbon ratio fluorinated carbon material, belonging to the field of fluorinated carbon material preparation. The method for preparing a high fluorine-to-carbon ratio fluorinated carbon material includes the following steps: S1: Crush tea stems and filter to separate the tea stem fragments; S2: Stir the dried tea stem fragments with an acid solution at 100℃-130℃ for 2-4 hours, and wash the tea stem fragments until the pH of the aqueous solution is 6-8; S3: Heat the tea stem fragments to 140℃-160℃ under an inert gas atmosphere. The mixture is heated to ℃ and maintained at that temperature for 1.5-2.5 hours, then carbonized at 1100℃-1400℃ for 2-4 hours. After cooling, pyrolytic carbon material is obtained. S4: The pyrolytic carbon material is washed with water until neutral, dried, and ground into powder. S5: The powder is placed in a container and evacuated. Fluorine-containing gas is introduced, maintaining a pressure of 0.3-0.7 MPa, and reacted at 280℃-360℃ for 12-72 hours. After the reaction, the temperature is lowered to room temperature to obtain a high fluorine-to-carbon ratio fluorinated carbon material. This invention uses tea stems as raw material and utilizes a high-pressure, low-temperature fluorination process to obtain a high fluorine-to-carbon ratio fluorinated carbon material with a fluorine-to-carbon ratio ≥1.0.