44results about How to "Improve collapse" patented technology

The invention relates to a tandem type hydrodynamic force sound wave generation device. The tandem type hydrodynamic force sound wave generation device is characterized in that the front end of a cavity is provided with a first spray nozzle connected with a fluid pipeline, the back end of the cavity is provided with a second spray nozzle, the center lines of the first nozzle and the second nozzle are on the same straight line, and a divergent reflector is arranged on the outer wall of the second spray nozzle; the first spray nozzle and the second spray nozzle are connected in series through an oval cavity, two spring pieces can be used for generating different sound wave frequencies, and sound waves generated by the second spring piece are reflected by the inner wall of a reflector and then propagate along the divergent reflector, so that the generated sound waves have directivity. In addition, the tandem type hydrodynamic force sound wave generation device has the advantages of strong cavitation effect, high fluid mixing and emulsifying efficiency, simple structure, stable operation and relatively low cost; and as the movable spray nozzles can be changed and adjusted according to practical requirements, the tandem type hydrodynamic force sound wave generation device is suitable for industrialized application.

The invention provides a method for preparing an enhanced GaN field effect device structure. By inserting a layer of P-type two-dimensional semiconductor material under a gate metal, two-dimensional electron gas in a channel under a gate can be effectively depleted, and thus an enhanced GaN field effect device is prepared. The P-type two-dimensional semiconductor material of a contact region outside the lower part of the gate is etched and removed by using oxygen plasma, the contact resistance can be effectively reduced, and the device performance is improved. At the same time, by controllingan etching time and oxygen plasma concentration, an oxide film can be formed by a potential barrier layer by using the oxygen plasma, and the gate leakage of the device is reduced.

The invention discloses a rotary electric field and magnetic field synchronously assisted laser welding device and method and belongs to the field of laser welding. The welding device comprises an electricity and magnet regulating device and a positioning and clamping tooling. Supporting columns and rotary air cylinders in the positioning and clamping tooling are mounted on a bottom plate. An electric field generation bottom plate is mounted on the supporting columns. Press blocks are mounted on the rotary air cylinders correspondingly. Neodymium iron boron permanent magnets in the electricityand magnet regulating device are fastened to a magnetic field regulating disc. Insulation sleeves, a welding laser head and the magnetic field regulating disc are mounted on a direct drive motor. Thedirect drive motor is mounted on a main shaft. The two poles of an electric field power source are connected to the electric field generation bottom plate and the welding laser head correspondingly.By means of the device and method provided by the invention, easy, convenient and fast regulation of a rotary magnetic field and a steady electric field can be achieved, continuous regulation of the intensity can be achieved, synchronous movement of the electric field and the magnetic field along with welding laser beams is guaranteed, and therefore, the forming quality of laser welding joints isimproved by setting the reasonable laser technological parameters including the power, the focal length, the defocusing amount, the helium protective gas flow rate and the like.

The invention relates to a gas extraction method for L-shaped borehole staged fracturing of a weakened coal seam roof, which comprises the following steps: 1) selecting the drilling position and parameters at the ground position corresponding to the working face of the coal seam to be mined, and constructing L 2) After the construction of the L-shaped borehole is completed, casings and fracturing equipment are arranged in the L-shaped borehole, and each preset fracturing site of the coal seam roof is fractured by means of hydraulic jet staged fracturing, to weaken the roof of the coal seam; 3) After the fracturing operation is completed, remove the fracturing equipment and connect the casing in the L-shaped borehole to the gas drainage device; 4) Start the coal mining operation at the coal mining face, and While the coal face is moving forward, the gas in the fracture zone is extracted through the gas extraction device. This solution solves the problems in the prior art that the amount of gas extraction is limited and the extraction intensity is not enough, and the coal seam gas cannot be extracted and utilized to a great extent.

The invention discloses a non-stoichiometric ratio TiC reinforced copper-based composite and a preparation method thereof and belongs to the technical field of metallurgical composites. The composite is composed of, by mass percentage, 1-5% of non-stoichiometric ratio TiC particles and the balance a base body copper alloy. The base body copper alloy is a Cu-Ni-Sn-Si alloy. The preparation method comprises the following steps of 1, conducting vacuum in-situ reactive sintering on Ti2SnC, Ti3SiC2 and Cu powder to prepare a non-stoichiometric ratio TiC/Cu intermediate material; 2, placing Cu into a vacuum induction smelting furnace, after the Cu is fully molten, sequentially adding Ni, the TiC/Cu intermediate material, Sn and Si into the vacuum induction smelting furnace for smelting, so that a non-stoichiometric ratio TiC/Cu-Ni-Sn-Si powder material is obtained, and then conducting gas atomization treatment on the TiC/Cu-Ni-Sn-Si powder material, so that prealloy powder is obtained; and 3, conducting ball milling, cold pressing for blank production, vacuum sintering, extrusion and heat treatment on the prealloy powder, so that the TiC/Cu-based composite is obtained. The non-stoichiometric ratio TiC reinforced copper-based composite has the beneficial effects of being good in strength, low in friction coefficient, high in abrasion resistance and the like.

The invention relates to a layered rock salt selective solution mining cavity construction control process. The layered rock salt selective solution mining cavity construction control process specifically comprises the steps that during the construction of a salt cavern reservoir, first, drilling and fracturing are performed on an interlayer in a drilling stage, and the integrity of the interlayeris destroyed within a certain range; secondly, in the process of rock salt mining, an upper salt layer and a lower salt layer of the interlayer are first eroded to construct a cavity to enable the interlayer to be immersed in brine for a long time; meanwhile, the composition of a well injection water solution is changed to preferentially dissolve part of substances in the interlayer, and the interlayer structure is destroyed; and in addition, through a self-vibrating cavitating water jet device, the downhole water injection direction and water injection pressure are adjusted to increase the erosion effect on the interlayer and further promote the rapid denudation and collapse of the interlayer. Different mining schemes are adopted for different rock salt layer positions, the problem thatthe thick interlayer in layered rock salt is difficult to collapse is solved, and effective control over the shape of the solution cavity of the salt cavern reservoir is realized.

The invention provides a preparation method of a grid enhanced gallium nitride field effect device with a P type 2D material. The method comprises the following steps that a buffer layer, a channel layer, a barrier layer and an interface control layer are arranged on a monocrystalline substrate successively in an epitaxy way to obtain an epitaxial substrate; source and drain metal are deposited insource and drain regions on the epitaxial substrate respectively to form ohmic contact; a 2D material layer is deposited on the epitaxial substrate; a grid metal region is defined, and grid metal isdeposited; and the 2D material between the grid and source and between the grid and drain is oxidized in the oxygen rich atmosphere; a medium passivation layer is deposited in the surface of the interface control layer; and contact holes between the source/drain and the grid are formed. The P type 2D material replaces a traditional P-GaN layer, and exhaust 2D electron gas thereunder to form an enhanced filed effect ransistor, etching is replaced by oxidation, damage on the surface of a barrier layer can be reduced, and difficulties in the prior art are overcome.

The invention discloses a method for producing colored veins for artware. The method comprises the following steps of 1, leaf selecting, wherein high-quality leaves are selected; 2, enzymolysis, wherein after the leaves are boiled with clear water, compound enzyme is added for enzymolysis; 3, bleaching, wherein after veins obtained after enzymolysis are aired to be half-dry, light-shielded bleaching is conducted with a hydrogen peroxide solution; 4, dying, wherein after the veins obtained after bleaching are cleaned, the veins are aired to be half-dry, and dying is conducted with a natural pigment, so that the dyed veins are obtained; and 5, shaping, wherein the colored veins are dried and shaped. According to the method for producing the colored veins for the artware, a compound enzymolysis method is adopted, and after being dried, the veins can still maintain to be soft and is not likely to be fractured; and later-stage processing and shaping of the artware can be conducted conveniently. Meanwhile, safety in the production process is improved; required production time is shortened; and production efficiency is improved.

The present invention discloses a reverse ultrasonic assisted gas-liquid-solid three-phase abrasive particle flow polishing processing method and device, an ultrasonic generator is mounted in a position which is reverse in direction to abrasive particle flow, an included angle is formed between the abrasive particle flow direction and the position, a reverse ultrasonic is produced, the direction of the reverse ultrasonic is reverse to that of the abrasive particle flow, an included angle is formed between the abrasive particle flow direction and the reverse ultrasonic, the reverse ultrasonic can compress micro-sized bubbles near workpiece machining surface in an abrasive particle flow medium containing the micro-sized bubbles to collapse and perish the micro-sized bubbles, when the micro-sized bubbles are collapsed and perished, a reverse micro shock wave is produced, the direction of the reverse micro shock wave is reverse to that of the abrasive particle flow, the reverse micro shock wave allows the inner local area of the abrasive particle flow to produce a great pressure so as to produce microscopic explosion effect; two component forces are generated by the microscopic explosion effect, a vertical component force is used for improving the contact probability and acting force of abrasive particles and workpiece machining surface convex peaks, a reverse horizontal component force is used for forming relative block effect on the abrasive particles, the abrasive particle and workpiece action time is increased, and the abrasive particle flow polishing efficiency is greatly improved.

The invention provides an ultrasonic-assisted cavitation abrasive grain flow finishing method for titanium alloy surface oxide layers. The method comprises the following steps: stirring a solid-liquidtwo-phase mixed fluid to form high-speed turbulence vortex; extracting the solid-liquid two-phase mixed fluid, mixing the solid-liquid two-phase mixed fluid with micro-nano bubbles to form a high-speed and high-pressure gas-liquid-solid three-phase abrasive grain flow; spraying the high-speed and high-pressure gas-liquid-solid three-phase abrasive grain flow to a workpiece in a tank body for staged surface treatment; meanwhile, emitting ultrasonic waves by an ultrasonic device configured below the workpiece to form an ultrasonic cavitation effect, and forming a negative fluctuation environment with positive and negative pressure alternating rapidly in the high-speed fluid in the tank body to cause expansion and compression of micro-nano bubbles in the high-speed fluid. Under the comprehensive action of turbulence, jet, cavitaiton and ultrasonic waves, a manner of combining cavitation abrasive grain jet and turbulence integrated surrounding type processing and ultrasonic enhancement isadopted, synchronous stripping of different in-situ defects of oxide scale and derivative and chain stripping of new defect points can be realized, the removal efficiency is high, and the processinguniformity is good.

A groove double-field-plate AlGaN/GaN HEMT device comprises a substrate, a buffer layer, a barrier layer and a passivation layer which are sequentially arranged from bottom to top, and a source electrode, a drain electrode and a gate electrode which extend to the barrier layer, with the gate electrode located between the source electrode and the drain electrode. A groove double-field is arranged on the barrier layer and between the gate electrode and the drain electrode. The buffer layer is composed of GaN with the thickness of 2 microns, and the doping concentration is 1 * 10 < 15 > cm <-3 >. The barrier layer is composed of AlGaN with the thickness of 20 nm, and the doping concentration is 1 * 10 < 17 > cm <-3 >. The passivation layer is composed of Si3N4 with the thickness of 50 nm. The lengths of the gate electrode, the source electrode and the drain electrode are all 0.5 [mu]m. The length Lfp1 and the length Lfp2 of the groove double-field-plate structure are 0.3 [mu]m and 0.7 [mu]m respectively, the thickness H + Hfp1 and Hfp2 of the passivation layer below the field plates is 10 nm and 20 nm respectively, and the groove is filled with Si3N4. The electric field peak value is reduced, current collapse is improved, and meanwhile a saturated leakage current finally output by the device cannot be greatly reduced.

The invention relates to a variable and controllable cavitator, which comprises a large jar body and a small jar body, wherein the small jar body is located on the right side of the large jar body, and is communicated to the large jar body, the left port of the large jar body is covered with a large jar end cover, the right port of the small jar body is covered with a right end cover, the right end of the small jar body is connected to a fluid inlet, the right end of the large jar body is connected to a fluid outlet, the left port of the small jar body is provided with a flow intercepting cone, a flow passing throat port is arranged along the axis of the flow intercepting cone, a sliding plate capable of axially sliding along the inner wall of the large jar body is arranged on the middle section of the inner cavity of the large jar body, the left side of the large jar end cover is connected to an end cover box, a piston is arranged in the center hole of the large jar end cover, is driven by a screw rod sleeve, and is connected to the sliding plate through a connecting cylinder, a screw rod shaft is screwed in the screw rod sleeve, a jet cone is fixed on the right end head of the screw rod shaft, and is inserted into the flow passing throat port of the flow intercepting cone, and a fixed pore plate is arranged on the right end of the flow intercepting cone, and is provided withan adjustable center hole and peripheral holes. According to the present invention, the cavitator can achieve multiple cavitation modes, and has characteristics of high raw material adaptability and good cavitation effect.

The invention discloses a device for carrying out cavitation treatment on sewage by utilizing ship waste heat and a working method.The device comprises a first sewage tank, a centrifugal pump, a heat exchanger, an engine cylinder sleeve water tank, a combined cavitation device, a second sewage tank, a detection device, a first stop valve and a second stop valve, wherein the first sewage tank is connected with the centrifugal pump through a pipeline; the centrifugal pump is connected with a heat exchanger interface a through a pipeline, a heat exchanger interface b is connected with the combined cavitation device through a square and round pipeline, a heat exchanger interface c and a heat exchanger interface d are connected with the engine cylinder sleeve water tank through pipelines, the combined cavitation device is connected with the second sewage tank through a pipeline, the second sewage tank is connected with a detection device and a first stop valve through pipelines, and the second sewage tank is connected with the first sewage tank through a pipeline. The device has the function of efficiently treating sewage, the ship waste heat is effectively utilized, the sewage temperature can be increased, the cavitation efficiency and the sewage purification efficiency are improved, and the energy consumption is reduced.

The invention relates to the technical field of precision casting and material preparation, in particular to a shell material used for pump valve precision castings and preparation process and application thereof. The used base material is the electroquartz powder, the binder is ethyl silicate, and the reinforcing material is the white corundum powder. Firstly, the electroquartz powder and ethyl silicate are mixed in proportions and stirred evenly, and the viscosity of the slurry is adjusted through deionized water to form a slurry. Then, the slurry is coated on the back layer of the shell, the number of the coating layers is 1 to 3, and the thickness is 0.5 to 3 mm. Then, the conventional slurry is coated to make the pump valve type precision casting shell, which is used for pouring the castings. The pump valve precision casting shell prepared by using the shell material and process disclosed by the invention has good collapsibility, can be applied to the precision casting industry, and can effectively solve the long production cycle and cost increase caused by the difficulty of shelling and other problems, which has higher economic benefits and long-term application prospects.

The invention relates to the technical field of micronization processing, in particular to an ultrasonic energy-gathering crushing method and device. The device comprises an ultrasonic transducer (1),a coupling liquid cavity (2), an energy-gathering crushing cavity (3), a diaphragm (4) and a diaphragm groove (7). According to the device, the ultrasonic transducer with a concave spherical transduction surface is utilized for producing energy focusing, the cylindrical crushing cavity is utilized for guiding, recovering, reflecting and gathering secondary energy, and a feed liquid carrying particles is controlled to flow through various levels of energy enriching areas. According to the ultrasonic energy-gathering crushing method provided by the invention, energy gathering is favorable for improving the energy density and provides high-magnitude energy supply for crushing. According to the method, the energy magnitude and the energy utilization efficiency can be improved, and the controllability of a particle micronization process and the consistency of product particle size are improved.

The invention discloses a binder for improving the hardening strength of molding sand, and relates to the technical field of casting. Phosphoric acid and maleic acid are mixed and then heat treatmentis carried out to obtain mixed acid; the mixed acid is added to water to prepare a mixed acid solution; and aluminum hydroxide and sodium carbonate are added to the mixed acid solution, ultrasonic treatment is performed for 3 to 5 minutes to obtain a reaction solution, and then the reaction solution is stirred at the rotating speed of 500r/min and 1500r/min respectively for 1 to 1.5 hours to obtain transparent liquid, that is the binder is obtained. The invention provides the binder for improving the hardening strength of the molding sand; the binder prepared by the invention is applied to a sand mold; under the promotion of microwaves, the hardening time can be shortened greatly, the production efficiency is improved, meanwhile, the instant strength can be greatly improved, and the binderhas more excellent collapsibility, low retained strength and is more conducive to recycling.