13results about How to "Avoid high temperature oxidation" patented technology

The application belongs to the technical field of two-dimensional materials, and relates to a method for preparing two-dimensional MXene materials through high-energy electric shock fluorinated salt etching in seconds, which comprises the following steps: 1) after grinding and mixing of a parent phase MAX powder and a fluorinated salt, the mixture is loaded into a quartz tube of a high-energy electric shock device, graphite electrodes are inserted into two ends of the quartz tube, and the material is compacted to be in close contact with the electrodes; 2) after completion of capacitor charging of the high-energy electric shock device, a discharge button is opened, high-energy electric shock is performed, the reaction is completed after flash phenomenon occurs, fluorinated salt is supplemented, and electric shock is repeated for 2-3 times; 3) the product after electric shock is ground and washed with acid, and after washing with deionized water until neutral, standing or centrifugal layering is performed, and the MXene two-dimensional material is obtained from the upper layer. Through high-energy electric shock, the reaction is completed in an instant, the comprehensive energy consumption is lower, and the etching efficiency is faster, and due to fast reaction time, high-temperature oxidation of the MXene can be effectively inhibited, and the application prospect is better.

This invention provides a surface mount reflow soldering method and apparatus. The method includes: pre-treating the solder paste state and performing reference positioning correction on the PCB pads to align the PCB pads with the target pad area; using an electroformed stencil with inverted conical openings and a surface nano-coating, printing the pre-treated solder paste onto the PCB pads under closed-loop monitoring; placing the printed PCB in a reflow soldering chamber, and strictly controlling the residual oxygen content in the chamber below a preset critical value through a closed-loop oxygen concentration control system; and performing thermal history control of the reflow soldering peak temperature, holding time, and cooling temperature based on the melting point characteristics of the solder paste to complete the soldering process. This improves printing transfer efficiency, reduces soldering oxidation problems, and ensures sufficient melting and wetting of the solder.

The invention relates to the technical field of tar residue treatment, in particular to mechanical residue removing equipment and process based on a tar residue storage tank, the residue removing equipment comprises the storage tank, a mixture conveying pump, a production unit and a guarantee unit, the mixture conveying pump is an intelligent variable frequency pump, and an outlet of the storage tank is connected with the input end of the mixture conveying pump; a flow detection module is mounted at the joint of the mixture conveying pump and the storage tank and is used for monitoring the flow of the tar residue mixture in real time and feeding back a signal to a control system of the mixture conveying pump; the output end of the mixture conveying pump is connected with the production unit, and the production unit is provided with two output ends, namely a solid output end and a liquid output end; the liquid output end is connected with the guarantee unit, and the guarantee unit comprises a showering system and a steaming and blowing system; the viscosity of the tar residues in the storage tank is greatly reduced through intermittent steaming and blowing softening and synchronous ammonia water spraying, the mixture conveying pump is smooth in pumping, and the problems that the tar residues in the storage tank are left and cannot be cleaned thoroughly are solved.

The application discloses a kind of low altitude flight sensing radar equipment chip level high temperature dynamic aging test unit, it is related to chip aging equipment technical field, including the heating carrier for bearing low altitude flight sensing radar equipment chip and the closed cavity for providing closed test environment, heating carrier is connected with closed cavity by pull-out type structure cooperation, realize independent development aging test or multiple integrated combination use;Heating carrier includes metal elastic needle, PCB board, heating module, metal heat sink, sheet metal shell, guide rail clamping groove and multi-core plug terminal, closed cavity includes cavity shell, guide rail, heat dissipation fan, gas valve and drawer locking mechanism.Can overcome the defects that existing equipment cannot unit temperature control, poor adaptability, unstable test environment, realize equipment structure simplification and miniaturization, achieve each test unit independently controlled temperature, gas environment and other parameters, while improving test operation convenience and result accuracy, reduce test cost.

The utility model discloses a novel bend -resistant polyester type halogen -free environmental protection explosion -proof shielding control cable, including cable installation layer, the outside installation of cable installation layer has cable protection composite layer, the cable protection composite layer includes elastomer sheath, the inside installation of elastomer sheath has multipoint position bending monitoring subassembly, and the multipoint position bending monitoring subassembly is by elastic electricity -making band and a plurality of bending monitoring units, and the elastic electricity -making band includes elastic protection zone, and the inboard of elastic protection zone is installed with a plurality of electricity -making silk, and the bending monitoring unit includes installation box, and the inboard fixed mounting of installation box has electricity -making seat, and the upper end surface fixed mounting of electricity -making seat has pressure -sensitive resistance, and the upper end surface installation of pressure -sensitive resistance has the elastic support plate. The utility model discloses through to the cable and carries out the layering cladding, can effectively improve the bending -resistant and stability of cable, can determine the bending position and bending degree simultaneously.

The utility model discloses a target material heat treatment furnace capable of accurately measuring temperature on line, which comprises a furnace body, a temperature display instrument, a plurality of temperature measuring devices and a plurality of temperature measuring wires, the temperature measuring devices are respectively inserted into temperature measuring holes of a target material, the temperature display instrument is arranged outside the furnace body, and one side of the furnace body is provided with a threading hole communicated with a furnace cavity of the furnace body. One end of each temperature measuring line is connected with the temperature measuring device, the other end of each temperature measuring line penetrates through the threading hole to be connected with the temperature display instrument, fireproof heat insulation filler is filled between the threading hole and each temperature measuring line, and each temperature measuring device is provided with a sealing piece used for sealing the temperature measuring hole of the target material. A plurality of temperature measuring holes are formed in the target material, and the temperature measuring devices are respectively inserted into the temperature measuring holes, so that the actual temperature of the target material is directly detected, heat treatment process parameters can be accurately controlled, and the influence of a target material heating curve lagging behind the display temperature of a target material heat treatment furnace on the quality of the target material is reduced; the influence of different initial charging temperatures on the target material quality is reduced, and the target material grain uniformity is improved.

The invention discloses a preparation method for coating one side of glass fabric with polytetrafluoroethylene by a vertical gluing machine, and belongs to the field of manufacturing of bonding sheets in copper-clad lamins.The preparation method comprises the steps that firstly, the glass fabric is installed on a rolling device, and tension is adjusted through a fabric storage mechanism; then, a vertical three-roller precise transfer coating system is used for quantitatively coating the PTFE slurry with the controlled viscosity in a constant-temperature glue storage tank on the cloth surface in a single face mode, and the non-coating face is synchronously gelatinized; the coated cloth enters a six-section type vertical drying oven to be subjected to stepped curing, pre-drying, high-temperature melting, crystallization curing and gradient cooling are conducted in sequence, the temperature of the high-temperature section reaches 380-385 DEG C, and a double-layer air curtain is arranged on the non-coated side for isolation; and finally, cooling to 50-80 DEG C, and rolling. The tension is controlled within the range of 5-15 N / cm through a sectional type vertical tension control system in the whole process. According to the method, single-face accurate coating is achieved, the problems of slurry waste, poor uniformity, many defects, unstable size and the like of a traditional horizontal process are solved, and the product performance is excellent.

The present application relates to metal wire plastic processing and photovoltaic module manufacturing technical field, more specifically, it relates to a kind of photovoltaic copper wire double-mode traction gas-liquid cooling stretching process and device, including integrated frame, on integrated frame, along the direction of travel of photovoltaic copper wire, first wire drawing module, tension compensation module, second wire drawing module and gas-liquid cooling module are sequentially arranged, controller is as core hub, coordinate first wire drawing module and second wire drawing module gradually progressive exert traction force, traditional single-stage concentrated stretching stress is dispersed into two-stage progressive stretching, reduce single-point stress concentration, tension compensation module can be dynamically path adjusted, to absorb or release excess tension, gas-liquid cooling module can be targeted cooling and drying treatment, realized "dispersion stretching-dynamic stable tension-on-demand cooling" integrated closed-loop operation, effectively overcome the problem such as wire breaking of tension mutation in traditional wire drawing process, heat accumulation causes lattice distortion and surface oxidation.

The application provides a metallized polymer film and a preparation method thereof, which comprises the following steps: S10: providing a polymer base film; S20: spraying a metal powder to the surface of the polymer base film by an atmospheric plasma torch to form a metal coating on the surface of the polymer base film, so as to obtain the metallized polymer film. By using the atmospheric plasma torch and controlling the spraying conditions, the application realizes the control of the high-speed plasma jet energy, and then the momentum and heat input to the surface of the polymer base film, so that the metal coating is deposited on the surface of the polymer base film without damaging the polymer base film, thereby obtaining the metallized polymer film with the stable and firm combination of the metal coating and the polymer base film.

The application provides a Sn-In-Ga ternary doped copper powder, a preparation method thereof and a TOPCon photovoltaic copper paste. The Sn-In-Ga ternary doped copper powder comprises copper powder, tin, indium and gallium, the tin, the indium and the gallium are attached to the surface of the copper powder, and the atomic molar ratio of each element in the Sn-In-Ga ternary doped copper powder is Cu:Sn:In:Ga=(98.0-99.2):(0.2-0.8):(0.2-0.8):(0.2-0.8). The Sn-In-Ga ternary doped copper powder can have good conductivity, oxidation resistance and interface compatibility.

The invention discloses a nitrogen-containing heterocyclic borate modified black phosphorus nanosheet for a lubricating oil additive, and a preparation method and application of the nitrogen-containing heterocyclic borate modified black phosphorus nanosheet. The lubricating material is prepared from the following raw materials in parts by weight: 0.6 part of black phosphorus / polyvinylpyrrolidone composite powder, 0.6 part of polyvinylpyrrolidone and 1-3 parts of bismuth oxide, the preparation method of the black phosphorus / polyvinylpyrrolidone composite powder comprises the following steps: mixing black phosphorus powder and polyvinylpyrrolidone in an organic solvent, carrying out alternate mechanical stirring and ultrasonic treatment to obtain a suspension, centrifuging, taking a precipitate, and carrying out vacuum drying to obtain the black phosphorus / polyvinylpyrrolidone composite powder. According to the lubricating material provided by the invention, through a double protection mechanism of bismuth oxide coating and PVP grafting, high-temperature oxidation of black phosphorus is effectively inhibited, and the thermal stability of the material is remarkably improved. The material can still keep a low friction coefficient of 0.18-0.25 at a high temperature of 800 DEG C, and has excellent friction reduction and wear resistance. In addition, the lubricating liquid prepared from the lubricating oil is good in dispersion stability, free of sediment after standing at normal temperature for 7 days and convenient to store and use.

This invention relates to an ultra-low temperature ceramic binder, which is mainly composed of the following raw materials in the indicated mass percentages: Bi₂O₃: 40-80%, B₂O₃: 5-15%, ZnO: 10-35%, SiO₂: 0-5%, Li₂O: 0.5-3%, TiO₂: 0-5%, CaF₂: 2-10%, Y₂O₃: 0-5%. This binder can be fired at a minimum temperature of 400°C and softened at a minimum temperature of 320°C. It enables the ceramic binder to achieve bonding and consolidation before the polymeric pore-forming agent and temporary polymeric binder burn off, maintaining the integrity of the pore structure while achieving a high porosity. Furthermore, using this ceramic binder and a preferred polymeric pore-forming material, it is possible to construct spherical pores with interconnected microscopic gaps, and the pore size can be controlled during preparation.