17 results about "Micropipe" patented technology

The invention relates to the technical field of micropipe drawing forming, in particular to a mold suitable for micropipe drawing forming. Comprising a plurality of die mounting seats, the die mounting seats are mounted on a fixing support at intervals, a drawing die is fixedly mounted in each die mounting seat, the diameters of a plurality of forming holes are sequentially increased or decreased from left to right, a pipe blank sequentially penetrates through the forming holes, a mandrel is arranged in the pipe blank in a penetrating mode, and the mandrel is connected with the die mounting seats. A supporting mechanism is arranged on one side of a feeding port of each drawing die, and a detecting mechanism is arranged on one side of a discharging port of each drawing die. The supporting mechanism can preshape a pipe blank about to enter the drawing die, so that the deformation uniformity of the pipe blank is guaranteed, the detection mechanism can detect the size and the appearance of the formed pipe blank, the product quality can be guaranteed, meanwhile, the abrasion condition of the die can be reflected, and the production efficiency is improved. And a worker is prompted to replace in time.

The invention discloses an ultra-pure gas or isotope separation device based on capillary force driving, and the device comprises a rectification unit which is formed by stacking a plurality of microtubes; the micro-tube rectification unit is arranged in the shell; the diameter of each micropipe is in a range of 0.3 mm-1 mm, and a gas-liquid phase exchange hole is formed in the pipe wall of each micropipe, so that the micropipes provide a liquid phase channel for liquid to flow under the action of capillary force of the micropipes and surface tension of the gas-liquid phase exchange holes in the rectification process of ultra-pure gas or isotope to be rectified; according to the equipment and the system, the rectification unit is small in size and high in heat and mass transfer efficiency, rectification is achieved by horizontally placing the rectification unit, and the requirement for the height space is low.

A wafer inspection system employing reflected bright-field microscopy can be adapted with polarizing optics and a mirror to detect polarization-altering defects (such as micropipes) in semiconductor wafers. The polarization-altering defects can be located within the bulk of the semiconductor wafer and can be imaged as bright features on a darker background. The system can also be used for conventional bright-field inspection of non-polarization-altering defects such as contaminants and inclusions.

The invention discloses a microtube vibration wind tunnel test test section and a test method, and belongs to the technical field of heat exchange equipment. The main body of the test section comprises five parts, namely a stable section, a flow guide section, a test section, a microtube core body and a test system, is of a spiral periodic arrangement complex microtube bundle structure, and provides a vibration wind tunnel test. Incoming flow air flows into the testing section from the periphery through the flow guide section and then enters the microcapillary core body. The micropipe core body is an annular cylindrical core body provided with the micropipe row, incoming air flows across the micropipe row in the core body, disturbs the micropipe row and vibrates the micropipe row, finally, the air flows through the exhaust flow guide cone and is exhausted along a channel, and the whole process enables air flow to simulate the real flowing condition. Meanwhile, a laser displacement sensor is adopted to measure vibration displacement, and the structural vibration of the microcapillary is tested. The test section can realize vibration displacement measurement of the complex spiral microcapillary structure, and provides reference for structural reliability evaluation of the heat exchange microcapillary structure in a complex flow field.

The present disclosure relates to a connecting sleeve, in particular a half-shell connecting sleeve, for a micropipe, in particular a defective one, in particular for connecting micropipe end pieces of a defective, in particular interrupted, micropipe or of two different micropipes, comprising: two housing halves, in particular half-shell sleeves, which are configured to receive a sealing agent and / or a micropipe insert, wherein the housing halves can be clamped against each other by means of one or more connecting clamps, in particular push-fit clamping sleeves, in particular via dovetail guides, wherein at least one of the housing halves comprises at least one locking element which is configured to engage the micropipe, in particular a defective one, in particular to wedge it, in particular to claw it, in particular to secure a position of the connecting sleeve on the micropipe, in particular a defective one.Furthermore, a suitable sealant and / or a microtube insert is described.

The present invention relates to a droplet generation device, system, droplet generation method and their applications. The droplet generation device includes a volume-variable accommodating chamber, a control mechanism for controlling the volume change of the accommodating chamber, and a droplet generation tube having a first port and a second port that are relatively far apart, the first port of the droplet generation tube is connected to the accommodating chamber, and the inner diameter of the second port is above 0.2 mm. The droplet generation method includes: inserting the droplet generation tube into a first liquid so that the second port of the droplet generation tube is located below the liquid surface of the first liquid; controlling the volume of the accommodating chamber to change, and driving the second liquid to move, droplets are formed in the droplet generation tube and then flow out from the second port and enter the droplet receiver. The present invention provides a brand-new droplet generation method, which breaks through the limitation that the existing nanoliter-level droplet generation technology must use micro-pipes below 0.1 mm, and can achieve the preparation of small-volume uniform droplets at a significantly reduced cost.

An SiC epitaxial wafer according to the present embodiment comprises: an SiC substrate which has a micropipe; and an SiC epitaxial layer which is formed on the SiC substrate. The SiC epitaxial layer has a density of stacking faults caused by the micropipe of the SiC substrate of less than 0.067 per cm2.

The application discloses a kind of peptide micropipe / In2O3 / Au composite gas-sensitive materials, its preparation method and application, belong to gas-sensitive material technical field.The material is self-assembled peptide micropipe (SPMFs) as three-dimensional support skeleton, by solution mixing and functional modification, make In2O3 nanoparticle uniform dispersion, Au nanoparticle surface load, form ternary composite system.SPMFs porous structure provides stable load platform for nanoparticle and accelerates gas diffusion, the LSPR effect of Au nanoparticle can enhance visible light absorption and surface reactivity, the heterojunction formed by In2O3 and SPMFs regulates electron transport.Under the synergistic effect of the three, material can detect ethanol at room temperature under visible light excitation, with high selectivity, high sensitivity and fast adsorption and desorption characteristics, detection lower limit is as low as 1 ppm, meet the demand of trace ethanol real-time monitoring.

A SiC single crystal substrate of an embodiment is a SiC single crystal substrate wherein the main plane of the SiC single crystal substrate has an off angle of 0° to 6° to the (0001) plane in the <11-20> direction and an off angle of 0° to 0.5° to the (0001) plane in the <1-100> direction, and includes non-MP defects wherein when the Si surface is etched in molten KOH at 500° C. for 15 minutes, the non-MP defects that appear by etching are hexagonal and have no core, the area of the observed etch pit of the non-MP defect is more than 10% larger than that of the observed etch pit of the TSD and is less than 110% of that of the observed etch pit of the micropipe (MP), and a transmission X-ray topography image of the non-MP defect is distinguishable from the transmission X-ray topography image of the micropipe (MP), wherein etch pits, which are identified as the non-MP defects, appear in the range of 0.1 / cm2 to 50 / cm2.

A silicon carbide ingot having micropipes in a seed crystal closed and being reduced in the gathering of screw dislocations, a method for manufacturing the silicon carbide ingot, and a method for manufacturing a silicon carbide wafer are provided. The silicon carbide ingot includes a seed crystal composed of a silicon carbide single crystal and having micropipes being hollow defects; a buffer layer provided on the seed crystal and composed of silicon carbide; and a bulk crystal growth layer provided on the buffer layer and composed of silicon carbide. The buffer layer and the bulk crystal growth layer have a plurality of screw dislocations continuous with the micropipes closed with the buffer layer, and the plurality of screw dislocations having the micropipe in common in the bulk crystal growth layer are 150 um or more apart from each other.

Disclosed are droplet deposition systems. The systems regulate the pressure of the system by, for example, coordinating the pressure provided by a pressure source with the pressure released when a droplet is dispensed. Alternatively, or in addition to the above, a pressure regulator may be used to maintain the coating liquid in equilibrium and permitting the dispensation of a droplet when a piston actuator contacts a micropipe. A robotic arm can be used to apply the coating to a substrate, such as a military aircraft.

A SiC single crystal substrate of an embodiment is a SiC single crystal substrate wherein the main plane of the SiC single crystal substrate has an off angle of 0° to 6° to the (0001) plane in the <11-20> direction and an off angle of 0° to 0.5° to the (0001) plane in the <1-100> direction, and includes non-MP defects wherein when the Si surface is etched in molten KOH at 500° C. for 15 minutes, the non-MP defects that appear by etching are hexagonal and have no core, the area of the observed etch pit of the non-MP defect is more than 10% larger than that of the observed etch pit of the TSD and is less than 110% of that of the observed etch pit of the micropipe (MP), and a transmission X-ray topography image of the non-MP defect is distinguishable from the transmission X-ray topography image of the micropipe (MP), wherein etch pits, which are identified as the non-MP defects, appear in the range of 0.1 / cm2 to 50 / cm2.

The application discloses a neodymium-iron-boron magnet based on grain boundary diffusion for improving magnetic properties and a preparation method thereof. The preparation method comprises the following steps: mixing neodymium-iron-boron magnetic powder, a lubricant and nanotubes or micropipes to obtain mixed magnetic powder; performing orientation compression molding, isostatic pressing and vacuum sintering on the mixed magnetic powder to obtain a diffusion base material; cutting the diffusion base material according to size requirements, grinding off a surface oxide layer, and cleaning to obtain a cleaned base material; uniformly spraying an alloy diffusion source on the surface of the cleaned base material to perform grain boundary diffusion to obtain a magnet; and performing secondary tempering treatment on the magnet to obtain a grain boundary diffusion magnet. In the method, nanotubes or micropipes are added into the neodymium-iron-boron magnetic powder, diffusion channels penetrating through the grain boundaries are formed in the sintering process, and then the magnet is subjected to grain boundary diffusion by using a rare earth alloy diffusion source, so that the grain boundary diffusion depth of heavy rare earth elements is significantly improved, and the magnetic properties of the magnet are improved. The neodymium-iron-boron magnet prepared by the method has excellent performance.

The invention relates to the technical field of gas turbines, and provides an array micropipe premixing staged hydrogen fuel combustion chamber which comprises micropipes, a first feeding pipe, a second feeding pipe, a premixing cavity outer casing and a flame tube outer casing. The outer side face of the flame tube outer casing is sleeved with the premixing cavity outer casing, a gap is reserved between the premixing cavity outer casing and the flame tube outer casing, a premixing cavity is formed in the premixing cavity outer casing, and the multiple micro-tubes are arranged in the premixing cavity side by side and extend into the flame tube outer casing; the micropipe is provided with a first air inlet and an air outlet which are oppositely arranged, a second air inlet is formed in the outer side face of the micropipe, the first feeding pipe is communicated with the first air inlet, and the second feeding pipe and the gap are both communicated with the second air inlet. Combustion is carried out in an array micro-pipe mode, inlets of fuel, oxygen and working media are independent, efficient combustion is achieved through synchronous classification of the oxygen and the fuel, the mixing efficiency of the working media and hydrogen is improved through transverse injection of the working media in the micro-pipes, and then NOx emission of the combustion chamber is effectively reduced.

The invention discloses a preparation method of a radial gradient ultra-fine grain magnesium alloy microtube with a functional coating. The preparation method comprises the following steps: (1) carrying out multi-pass progressive room-temperature rotary swaging deformation on magnesium alloy; (2) the magnesium alloy subjected to rotary forging is cut, and a pipe blank is obtained; and (3) the tube blank is subjected to multi-pass cold drawing after being drilled and supported by a core mold, and the radial gradient ultra-fine grain magnesium alloy microtube is obtained. And 4) constructing a biological coating on the microtube. According to the method, through the collaborative process of multi-pass gradual room-temperature rotary forging, drilling core mold supporting, multi-pass cold drawing and final water-cooling restraining recovery, a gradient structure from core ultra-fine grains to edge fine grains is actively constructed in the radial direction of the thin-wall magnesium alloy micro-tube low in rare earth content or free of rare earth; accurate regulation and control of strain distribution, grain evolution and structure stability of the thin-wall biological magnesium alloy microtube are achieved, controllable construction of hundred-nanoscale ultrafine grains is further achieved, and the gradient structure enables the magnesium alloy microtube to have high strength and good plasticity.

A wafer inspection system employing reflected bright-field microscopy can be adapted with polarizing optics and a mirror to detect polarization-altering defects (such as micropipes) in semiconductor wafers. The polarization-altering defects can be located within the bulk of the semiconductor wafer and can be imaged as bright features on a darker background. The system can also be used for conventional bright-field inspection of non-polarization-altering defects such as contaminants and inclusions.

The application discloses a monoclinic phase BiVO4 micropipe prepared by a microwave radiation method and a preparation method thereof. Pure Bi(NO3)3.5H2O and NH4VO3 are used as reaction raw materials, distilled water is used as a solvent, polyethylene glycol (PEG-10000) with a molecular weight of 10000 is used as a surfactant, and a monoclinic phase BiVO4 micropipe material is prepared by using a microwave radiation technology. The microwave radiation process is simple in operation, energy-saving and environment-friendly, low in energy consumption, and energy-concentrated, and is favorable for improving a reaction rate and a synthesis efficiency of the BiVO4 material. The XRD and SEM analysis results of the product fully prove that the method can obtain the BiVO4 material with regular morphology and small particle size, is favorable for increasing active sites of the BiVO4 material, and thus improves the photocatalytic performance of the BiVO4 material. The target product BiVO4 material has the abilities of catalytic degradation of pollutants, catalytic photoelectrochemical decomposition of water and energy storage, and is expected to play an important role in the field of photocatalysis.