16results about How to "Prevent surface oxidation" patented technology

This utility model discloses an influenza virus detection structure, including a shell, a sample pad, a conjugate pad, a nitrocellulose membrane, and gold-platinum nanoparticles. Nanoparticles are adsorbed onto the conjugate pad via electrostatic interaction. The gold-platinum nanoparticles are immobilized on the surface of the nanoparticles using a thiolized antibody. A pore size gradient transition layer is provided between the sample pad and the nitrocellulose membrane. The conjugate pad is surface-modified with low-density silane to encapsulate the gold-platinum nanoparticles. In this influenza virus detection structure, the gold-platinum nanoparticles are immobilized on the surface of the nanoparticles using a thiolized antibody. A hydrophobic band divides the conjugate pad into a fourth, third, second, and first conjugate pad. Different proportions of gold-platinum nanoparticles are set in the four regions to distinguish different influenza viruses. Furthermore, the gold-platinum nanoparticles provide high sensitivity, facilitating the detection of samples with low viral loads.

The invention discloses a continuous purification device for high-purity indium, and relates to the technical field of high-purity indium processing. The device comprises a purification furnace, a feeding assembly is arranged on one side of the purification furnace and comprises a feeding box fixedly connected to one side of the purification furnace, first hydraulic cylinders are fixedly connected to the front end and the rear end of one side of the top of the feeding box correspondingly, and output shafts of the first hydraulic cylinders extend into the feeding box and are fixedly connected with a lifting plate; and extrusion rollers are rotationally connected to the two sides of the lower surface of the lifting plate and located at a feeding opening of the feeding box, a plurality of feeding rollers are rotationally connected to the lower portion of the interior of the feeding box at equal intervals, and an auxiliary heating assembly is arranged below the purification furnace. Indium raw materials are extruded and heated through the feeding box, the extrusion roller, the feeding roller and the air inlet pipe, the problem that the indium raw materials are inconvenient to heat and melt in the prior art is solved, the molten indium raw materials are uniformly heated through the steam box, the steam pipe, the baffle and the flow guide plate, and the problem that the existing vacuum distillation speed is low is solved.

The invention discloses an interstitial oxygen content detection method for a heavily-doped silicon single crystal, which comprises the following steps: carrying out heat treatment at a target temperature on a heavily-doped silicon single crystal to be detected and a reference sample in an inert gas atmosphere, interstitial oxygen in the heavily doped silicon single crystal to be detected is converted into oxygen precipitation; respectively carrying out infrared spectrum measurement on the to-be-measured heavily-doped silicon single crystal and the reference sample which are subjected to heat treatment to obtain first infrared spectrum data of the heavily-doped silicon single crystal and second infrared spectrum data of the reference sample; performing differential processing on the first infrared spectrum data and the second infrared spectrum data; and determining the interstitial oxygen content corresponding to the characteristic absorption peak intensity from a preset standard model. Therefore, the measurement accuracy of the interstitial oxygen content is improved.

The invention discloses a device for eliminating effect force during vibration of an electrolytic copper foil workpiece, which relates to the technical field of metal material processing and treatment and comprises a placing frame for supporting an electrolytic copper foil coiled material, and further comprises a base, the central bearing is located at the central position of the electrolytic copper foil coiled material and plays a role in rolling, and the electrolytic copper foil coiled material is placed on the placing frame through the central bearing; the uniform excitation mechanism is mounted at the end part of the central bearing through a special clamp, and excitation forces at different positions can be automatically adjusted through the uniform excitation mechanism according to the size of the copper foil coiled material, so that the situation that stress cannot be effectively eliminated due to unbalance of the excitation forces is avoided; and the vibration exciter is connected with the uniform vibration excitation mechanism, and vibration force is provided through the vibration exciter, so that stress elimination of the electrolytic copper foil coiled material is completed through the vibration force.

The application provides a silver-plated dot design method, a design system, a lead frame and a semiconductor package, and relates to the technical field of semiconductor packaging. The volume of a soldering end cap is obtained, the shape of a silver-plated dot cross section is set, the size parameters of the silver-plated dot cross section are calculated according to a preset soldering thickness, the cross section size of the silver-plated dot can be reasonably designed, the surface of the lead frame in the soldering area is prevented from being oxidized, the soldering spreading area is prevented from being too large, the soldering thickness is prevented from being too low, the tensile strength of the soldering point position is ensured, the packaging soldering yield is improved, and the reliability of the product is improved.

The application discloses a double-cavity device and a growth method for solar cell epitaxial wafer growth, which comprises a first reaction cavity, a second reaction cavity, a sample moving cavity, a sample conveying assembly, an exhaust assembly and a heating assembly. The upper ends of the two reaction cavities are provided with air inlet assemblies, the sample moving cavity is communicated with the two reaction cavities, the sample conveying assembly realizes rapid sample transfer, the heating assembly independently controls temperature, and the exhaust assembly leads out tail gas. The growth method comprises steps of cavity purification, temperature stabilization, establishment of bistable growth conditions, alternating growth of multilayer epitaxial layers and the like. The application adopts a double-cavity independent stable HVPE structure, realizes rapid sample transfer without exposure and pollution, obtains an atomic-level steep interface and a precise controllable doping distribution, is suitable for III-V semiconductor material epitaxial wafer growth, and is especially suitable for space high-efficiency solar cell epitaxial wafer manufacturing.

The invention provides a layered oxide material with a nanometer woven net interface structure and a preparation method and application thereof, and belongs to the field of electrode materials, a dilute acid solution is used as a reaction medium, and a spray pyrolysis mode is combined to enable dilute acid to fully react with a residual alkali compound on the surface of layered oxide, so that the layered oxide material is obtained. And synchronously converting into a uniform nano woven net interface structure in situ. A uniform nano interface structure can be prepared, belongs to a flexible film structure and has a relatively strong bonding effect, and the interface structure can persistently and stably exist in a charging and discharging process, so that the structural strain is reduced; the nano woven net interface structure has a relatively large specific surface area, so that the contact area and the liquid retention amount of the layered oxide material and an electrolyte are increased, and the diffusion of Li < + > and the migration of electrons are accelerated; the uniform knitted net interface structure can inhibit the surface oxidation of the material and the reaction with water and carbon dioxide in the air, improve the air tolerance of the matrix material, and also can greatly inhibit the erosion effect of the electrolyte on the matrix material.

A carbon-coated metal powder having metal particles and a coating layer containing carbon that covers at least a portion of the surface of the metal particles, the metal particles containing (1) tin, copper, or silver and inevitable impurities or (2) an alloy of tin, copper, or silver in which the content of tin, copper, or silver is 50% by mass or more, respectively, and inevitable impurities, the carbon-coated metal powder having an average particle diameter calculated from the specific surface area according to BET of 150 nm or less.

The present invention discloses a multi-walled carbon nanotube-supported high-entropy alloy catalyst, its preparation method and application. The high-entropy alloy catalyst consists of a multi-walled carbon nanotube support and high-entropy alloy nanoparticles supported on the surface of the multi-walled carbon nanotube support. The high-entropy alloy nanoparticles are composed of five metal elements, namely Fe, Co, Ni, Pt, and In, to form a thermodynamically stable FeCoNiPtIn high-entropy alloy solid solution phase. The high-entropy alloy nanoparticles are anchored on the surface of the support through chemical bonding and have a delocalized electron structure formed by d-p / d-d / sp hybridization. The catalyst prepared according to the method of the present invention exhibits excellent activity and durability in the hydrogen evolution reaction, can achieve long-term stable operation, and provides a reliable and efficient preparation technology solution with excellent performance for the large-scale industrial promotion of the electrolytic water hydrogen evolution reaction.

The application belongs to the technical field of metal substrates for high-thermal-conductivity, high-power power supply and automobile lamps, and discloses a thermoelectric separation metal substrate with a binary metal heat-conducting protrusion structure and a manufacturing method. The manufacturing method comprises the following steps: binary metal heat-conducting protrusion processing, including: laying an aluminum base, developing, exposing, and etching an aluminum-copper base protrusion; copper plating on the aluminum-copper base protrusion to obtain a binary metal heat-conducting protrusion; composite epoxy glass cloth organic substrate and heat-conducting adhesive prepreg processing and pressing; outer layer processing, forming, and testing. The binary metal (aluminum and copper) structure is designed and manufactured, the cost of the thermoelectric separation metal substrate material is reduced, the product weight is reduced, thermal expansion is reduced, and product surface oxidation is prevented.

The application discloses a lead-free composite solder and a preparation method thereof. The lead-free composite solder comprises an alloy core and a surface modification layer, and the surface modification layer is coated on the surface of the alloy core. According to mass percentage, the alloy core comprises Ag 0.3%-4.5%, Cu 0.2%-0.8%, Bi 0.5%-3.0%, Sb 0.01%-3.2%, Ni 0.01%-0.2%, Ga 0.005%-0.15%, Ce 0.005%-0.08%, and the rest is Sn. The surface modification layer comprises tin dialkyldithiophosphate and cerium alkylsalicylate. The bimetallic chelate type surface modification layer formed by tin dialkyldithiophosphate and cerium alkylsalicylate is adopted, the interface bonding strength is further strengthened, the solder surface oxidation is effectively inhibited, and the storage stability and environmental adaptability of the solder are improved. The alloy core is prepared through the synergistic matching of multiple components, the excessive growth of interface intermetallic compounds and the grain coarsening are inhibited, and the thermal fatigue resistance and long-term service reliability of the solder joint are improved.

The invention discloses a firmly-welded patch common-mode inductor with a terminal on the side face and a preparation process thereof, and belongs to the technical field of patch common-mode inductor preparation, and the preparation process comprises the following steps: S1, selecting a bare magnetic core with the initial magnetic conductivity of nickel-zinc ferrite being 10-2000 uiac and the initial magnetic conductivity of manganese-zinc ferrite being greater than 2000 uiac, and cleaning and drying the bare magnetic core; s2, high-temperature-resistant high-strength epoxy resin glue is used for pasting the Clip on the magnetic core, the curing temperature is 150 DEG C, the curing time is 90 min, and the position precision of the Clip is guaranteed through a positioning tool; and S3, the magnetic core pasted with the Clip is subjected to Ni / Sn electroplating treatment, and the electroplating thickness is that Ni is 2-4 [mu] m, and Sn is 7.0 [mu] m min. In the welding optimization link, reflow soldering furnace tin soldering operation is adopted, the solder paste component proportion and the welding temperature curve are accurately controlled, the stability of a product is greatly improved, and the service life of the product is greatly prolonged.

The present invention provides a method for continuously preparing titanium and titanium alloy wire materials with a short process, which relates to the technical field of preparing titanium and titanium alloy wire materials. The preparation method includes powder preparation, slurry preparation, wire blank forming, wire blank drying, wire blank coating, degreasing sintering, cold drawing and post-treatment carried out in sequence. Among them, the titanium and titanium alloy extrusion slurry is poured into the slurry tank of a screw extruder, and an ultraviolet light source or a heat source is equipped at the die opening of the screw extruder. The slurry is extruded through the die opening and in-situ solidified into a wire blank under the action of the light source or the heat source. By matching continuous production equipment with the technological processes of screw extrusion molding, degreasing sintering and cold drawing, the present invention avoids the high-temperature melting process of the traditional casting-drawing process and the complex processes of multi-pass hot rolling-drawing, realizes the short-process continuous and controllable preparation of titanium and titanium alloy wire materials, has high flexibility in the design of its composition and diameter, strong stability, wide applicability, low cost and excellent performance, and is very suitable for large-scale industrial production.

The present application relates to the field of electronic component welding, and particularly relates to a water-washing soldering paste and an application method thereof. The water-washing soldering paste comprises a first paste and a second paste. The first paste comprises a solvent, alloy powder and triisopropanolamine. The second paste comprises the solvent, water-based epoxy resin, activator, thixotropic agent and antioxidant. The solvent only comprises one or more of amphiphilic alcohol compound, polyhydric alcohol compound, polyether compound and glycol ether compound. The activator is organic acid. The antioxidant comprises phenolic compound and phosphite compound. Triisopropanolamine, as a corrosion inhibitor, promotes the cross-linking of water-based epoxy resin on the surface of alloy powder particles to form a dense protective film, and inhibits the hydrolysis of antioxidant and the oxidation of metal particles, thereby reducing the risk of grape effect.

This invention provides an intelligent heat treatment production line for strip steel, comprising a base, a frame, and a controller. A winding mechanism is mounted on the base, and a moving mechanism is located at the top of the frame. A heat treatment mechanism is connected to the bottom of the moving mechanism. The heat treatment mechanism includes an insulation box with a channel in which the strip steel slides. An induction heating tube is installed inside the insulation box. First hydraulic rods are positioned vertically opposite each other inside the insulation box and connected to a housing. Multiple T-shaped sliding rods are slidably mounted on the housing. The tapered portions of the T-shaped sliding rods and the tapered through-holes on the housing engage with each other. A helical spring is fitted onto one end of each T-shaped sliding rod, and an electromagnet is connected to the other end. The electromagnet has an air jet port. An air pump is connected to the inner cavity of the housing via air pipes one and two. The electromagnet in this invention drives the T-shaped sliding rods based on the change in magnetic force after the strip steel is heated, controlling the flow of inert gas and automatically controlling the heat treatment temperature to prevent overheating and surface oxidation of the strip steel.

The utility model discloses a novel bushing which comprises a first bushing body, a second bushing body is arranged on one side of the first bushing body, an assembling mechanism is arranged between the first bushing body and the second bushing body, and the end, close to the second bushing body, of the first bushing body is fixedly connected with a first semicircular plate. A second semicircular plate is fixedly connected to the end, close to the first bush, of the second bush, a plurality of mounting holes are formed in the front face and the back face of the first bush, and the first bush and the second bush are made of the same material and are sequentially provided with an outer protection layer, a wear-resisting layer and a base layer from outside to inside. The lining adopts a layered structure of the outer protective layer, the wear-resistant layer and the base layer, the outer protective layer effectively prevents the surface of the lining from being oxidized, the wear-resistant layer reduces friction loss with matched parts, the base layer provides structural strength support, the service life of the lining is prolonged, the maintenance cost is reduced, and the requirement of the industrial field for high performance of the lining is met.