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1274results about How to "Improve distribution uniformity" patented technology

Device for controlling delivery and uniform distribution of reaction gases in MOCVD reaction chamber

The invention discloses a device for controlling the delivery and the uniform distribution of reaction gas in a MOCVD reaction chamber. By respectively controlling the flow of gas passages non-uniformly distributed radially on a front gas homogenizing plate and input passages at different positions, at least two reaction gases are respectively introduced into two paths which are radially and axially crossed on a spray header, and can be secondarily distributed by nozzles in different shapes, so the uniformly distributed boundary layer concentration, speed and temperature required are achieved on the surface of a rotary epitaxial wafer, the quality of massively produced epitaxial films and the finished product ratio of massively produced epitaxial wafers are improved, the consumption of expensive reaction gases can be effectively controlled and the epitaxial production cost is reduced. By properly increasing the distance between the surface of the spray header and the epitaxial wafer, deposits generated on the surface of the spray header and the nozzles in the epitaxial growth are reduced, the cleaning period is prolonged, and the production efficiency and system capacity are improved. The device also can reduce the processing difficulty and manufacturing cost of the nozzles of the spray header and cooling medium passages.
Owner:JIANGSU ZHONGSHENG SEMICON EQUIP

Light metal surface laser impact micronano particle injection reinforcing method

The invention relates to a light metal surface laser impact micronano particles injection reinforcing method, comprising the following steps: 1) removing the oxide layer probably existing on the surface of the light metal by a mechanical polishing or chemical corrosion method, then grinding and polishing with sand paper, and finally cleaning the surface of the light metal alloy with acetone or alcohol; 2) precoating the micronano particles on the surface of the light metal with inorganic bonding agent, recoating a layer of black paint on the surface of the micronano particle coating layer to serve as the absorption layer of laser impact after drying, and drying naturally; 3) impacting the absorption layer and the micronano particle layer with high-energy short pulse laser, and utilizing K9 glass or running water as a restriction layer during laser impact; and 4) soaking the micronano particle coating layer processed by acetone, and then removing the absorption layer through washing with running water or ultrasonic washing to obtain the micronano particle injection reinforcing layer. The invention integrates the actions of laser impact reinforcement, nano particle reinforcement and nano particle reinforcement, can dramatically improve hardness, abrasion resistance and fatigue resistance property of light metal surface layer, and has wide application prospect.
Owner:TSINGHUA UNIV

Ink-jet dry granular decorative ceramic tile and manufacturing method thereof

The invention relates to the technical field of ceramic tiles, in particular to an ink-jet dry granular decorative ceramic tile and a manufacturing method thereof. The manufacturing method includes the following steps: A. bottom glaze decoration; B. pattern decoration; C. drying for the first time; D. dry granular decoration; E. spraying a protective glaze; and F. calcining to obtain the product.The method for preparing the dry granular decorative ceramic tile has the advantages of simple operation steps, convenient control, simplified process flow, improved production efficiency, reduced production difficulty and production cost, so that the method is suitable for industrial large-scale production; by spraying with dry granular ink, spray printing can be carried out on a designated position on the surface of a blank body, so as to enable a spray printed texture to be accurately correspond to a pattern decorative texture, and thus the distribution uniformity and adhesion of dry granules on the surface of the blank body are improved, and the prepared ceramic tile product has clear and distinct patterns, low glaze gloss, good anti-skid effect, obvious dry granular feeling, strong stereoscopic impression, rich colors, stable physicochemical properties and wide temperature adaptation range.
Owner:JIANGXI HEMEI CERAMICS +3

Super-long distance phase-sensitive optical time domain reflectometer (Phi-OTDR) system

The invention discloses a super-long distance phase-sensitive optical time domain reflectometer (Phi-OTDR) system, which comprises a Phi-OTDR demodulating system and detecting optical fiber, wherein a forward amplifying unit and a backward amplifying unit are respectively arranged at the front end and the back end of the detecting optical fiber. Detecting signal light of the Phi-OTDR system is amplified in a distributed manner by utilizing a bidirectional second-order or bidirectional multi-order Raman amplifying method, so that the uniformity of the intensity and the distribution of Rayleigh scattering signals on the whole optical fiber is further improved, the problem of the prior amplifying method of the Phi-OTDR system is effectively overcome, and the sensing distance of a single segment of detecting optical fiber of the Phi-OTDR system is further prolonged; and meanwhile, by utilizing bidirectional Raman amplifying multi-segment cascade connection, the super-long distance Phi-OTDR system which requires a low cost and has high performance can be realized. The method of the super-long distance Phi-OTDR system is helpful to improvements on the whole performance and the performance price ratio of the Phi-OTDR system during the application to long-distance safety monitoring of oil and gas transmitting pipelines, large-range peripheries, large-scale civil engineering structures, and the like.
Owner:SICHUAN GUANGSHENG IOT TECH CO LTD

Preparation method of Al2O3 nanoparticle reinforced aluminum-based composite material

The invention provides a preparation method of a Al2O3 nanoparticle reinforced aluminum-based composite material, belonging to the technical field of the aluminum-based composite material. The method uses sodium borate (Na2B4O7.10H2O) type boride and K2ZrF6 type fluoride powder as the reaction mixed salt and adopts the direct reaction of molten metal to directly synthetize the nano-Al2O3 particlereinforced aluminum-based composite material in molten aluminum. The invention mainly has the following advantages: the reaction system can effectively control the growth of Al2O3 particles and ensure that the size of the reinforcement phase is controlled to the nanoscale; and the synthesis temperature of the reaction system is 800-850 DEG C, and the defects of the traditional method which uses oxide to prepare the Al2O3 particle reinforced aluminum-based composite material can be overcome, wherein the defects are that the particles are easy to grow, the size can not be controlled and the reaction temperature is high. In addition, with the increase of the addition amount of the reaction mixed salt in the reaction system, the reinforcing particles have smaller size and more uniform distribution; the interface binding of the particles and the substrate is good, no pollution is caused; and the preparation method is an effective method which is suitable for preparing the high-performance nanoparticle reinforced composite material at a low temperature.
Owner:JIANGSU UNIV

Novel lithium-pre-intercalated negative plate and preparation method thereof

ActiveCN105244472AExcellent charge and discharge characteristicsLarge amount of pre-intercalated lithiumCell electrodesComposite filmGraphite
The invention discloses a novel lithium-pre-intercalated negative plate and a preparation method thereof. The novel lithium-pre-intercalated negative plate comprises a porous current collector, an active material layer and a lithium pre-intercalation layer, wherein the lithium pre-intercalation layer is attached to the active material layer; the active material layer is prepared from the following components represented by mass percentage: 75%-90% of an active material, 5%-20% of a conductive agent and 5%-10% of a binder; the active material is a lithium-intercalated carbon material; the lithium pre-intercalation layer is a dense and uniform composite thin-film layer of which the thickness is 5-30 microns; the lithium pre-intercalation layer is prepared from the following components represented by mass percentage: 50%-70% of graphite and 30%-50% of a lithium salt; and the lithium pre-intercalation layer is obtained by magnetron sputtering coating on the active material layer. The novel lithium-pre-intercalated negative plate disclosed by the invention is high in lithium-pre-intercalated quantity, high in adhesion to the active material layer and uniform in lithium intercalation, is achieved through magnetron sputtering coating, and is safe and time-saving; and the lithium-pre-intercalated quantity can be controlled.
Owner:江西展枭新能源科技有限公司

Matte BOPP (Biaxially-oriented Polypropylene) film for leather transferring and preparation method thereof

The invention relates to a matte BOPP (Biaxially-oriented Polypropylene) film for leather transferring and a preparation method thereof. The matte BOPP film consists of an inner surface layer, a core layer and an outer surface layer, and is prepared by coextrusion and two-way stretching of the inner surface layer, the core layer and the outer surface, wherein the inner surface layer comprises the following components in percentage by weight: 97.5-98.5% of polypropylene and 1.5-2.5% of adhesive; the core layer comprises the following components in percentage by weight: 98.0-98.4% of polypropylene, 1.0-1.2% of antistatic agent and 0.4-1.0% of slipping agent; the outer surface layer adopts a delustering material which comprises the following components in percentage by weight: 54-56% of polyethylene, 43.7-45.7% of high-density polyethylene and 0.3% of antioxidant. The matte BOPP film and the preparation method have the advantages that the selection and matching of the materials are reasonable, the selected polypropylene material is good in processing performance and high in mechanical strength; the prepared BOPP film is large in elastic modulus and low in heat shrinkage rate; the performance indexes such as haze and glossiness of the outer surface layer are excellent.
Owner:ZHEJIANG KINLEAD PACKAGING MATERIAL

Cutting tool for improving coating structure and preparation method thereof

ActiveCN103173761AExcellent oxidation and crater wear resistanceImprove uniformityTurning toolsSuperimposed coating processSingle phaseCast iron
The invention discloses a cutting tool for improving a coating structure. The cutting tool comprises a matrix and a coating covering the matrix. The coating comprises an inner layer B, a transitional layer C and an outer layer D from inside to outside. The inner layer B consists of transitional elements and nonmetal compounds. The transitional layer C comprises a transitional layer C1 and/or a transitional layer C2. The transitional layer C1 and C2 are mainly formed by carbon oxynitride with titanium. The outer layer D has a single phase alpha-Al2O3 structure. The thickness d of the outer layer D is 0.5-4 mu m. The mean grain size S is greater than or equal to 0.2 mu m but less than or equal to 0.5 mu m. The preparation method comprises the following steps of: first, preparing the tool matrix; then, sequentially depositing the inner layer B, the transitional layer C2, the transitional layer C1 and the outer layer D in a same coating period; and then, performing surface treatment to manufacture the cutting tool. The cutting tool provided by the invention is high in hardness and good in wear resistance, and has excellent cutting performance in cutting materials such as steel, stainless steel and cast iron.
Owner:ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD

In-pile flow distribution device of reactor of nuclear power station

The invention discloses an in-pile flow distribution device of a reactor of a nuclear power station. The device is used for distributing flow of a reactor core coolant; the flow distribution device comprises a lower reactor core support plate, a surrounding basket-shaped structure and vertical columns, wherein the surrounding basket-shaped structure is fixed below the lower reactor core support plate and comprises a porous surrounding basket and an eddy-current confinement plate positioned at the bottom of the porous surrounding basket; a plurality of flowing holes are respectively formed in the porous surrounding basket and the eddy-current confinement plate; the vertical plates are vertically arranged between the eddy-current confinement plate and the lower reactor core support plate. The in-pile flow distribution device of the reactor of the nuclear power station is relatively simple in structure, and by stirring and mixing the coolant through the eddy-current confinement plate and the vertical columns, eddy-current of a lower chamber is effectively inhibited, and the structure of the lower chamber is prevented from vortex shedding. The coolant is subjected to twice flow distribution through the surrounding basket-shaped structure and the lower reactor core support plate, so that the distribution effect is better, and the flow distribution uniformity in a reactor core fuel component is better.
Owner:中广核工程有限公司 +1

Method for improving performance of sintered neodymium-iron-boron magnet

The invention discloses a method for improving the performance of a sintered neodymium-iron-boron magnet. Two pieces of heavy rare earth, a sintered neodymium-iron-boron magnet green body and two separation nets are arranged on a separation board in an evaporation diffusion box one above another; the sintered neodymium-iron-boron magnet green body is positioned between the two pieces of heavy rare earth; the two pieces of heavy rare earth cover the upper surface and the lower surface of the sintered neodymium-iron-boron magnet green body; and when the sintered neodymium-iron-boron magnet green body is subjected to vacuum sintering under the condition that the vacuum degree is less than 1*10<-2>Pa, the two pieces of heavy rare earth are evaporated and diffused in an enclosed space, and heavy rare earth elements are diffused into the sintered neodymium-iron-boron magnet green body and are better distributed in the grain boundary and on the crystalline grain edge of the sintered neodymium-iron-boron magnet green body. The method has the advantages that specific to the sintered neodymium-iron-boron magnet of which the thickness surpasses 3 millimeters, the coercive force can be increased on the basis of ensuring that the residual magnetism does not fall basically; and the method is suitable for sintered neodymium-iron-boron magnets of which the thicknesses do not surpass 3 millimeters as well as sintered neodymium-iron-boron magnets of which the thicknesses surpass 3 millimeters, and has a wide application range.
Owner:NINGBO YUNSHENG +5

Preparation method of tin-based silver graphene lead-free composite solder

The invention discloses a preparation method of tin-based silver graphene lead-free composite solder. The method comprises the steps that a certain amount of graphene and lauryl sodium sulfate are mixed, then a certain amount of dimethylformamide is added, ultrasonic treatment is performed for 2 h, a certain amount of silver nitrate is added into a mixed solution, ultrasonic treatment is performed continuously, and finally a self-made silver graphene nanosheets are obtained; and required solder matrix powder is weighed according to different graphene mass fractions and poured into a ball milling tank for ball milling for 5 h, the powder is placed into a stainless steel mold after being dried and placed under a hydraulic machine to be pressed and molded at the pressure of 500 Mpa, and then a cylinder obtained through cold pressing is placed into a high-vacuum tubular resistance furnace for vacuum sintering for 2 h at the temperature of 175 DEG C and placed under the hydraulic machine after being cooled to the room temperature to obtain a cylinder through impact extrusion. According to the preparation method, Ag-particle-modified graphene is selected as a strengthening material so as to improve load transmitting between the nano-silver-modified graphene and a Sn matrix, and therefore the better strengthening effect is achieved.
Owner:TIANJIN UNIV

Multi-stage absorbing desulfurizing device by adopting ammonia-ammonium sulfate method

ActiveCN105148712AImprove ammonia utilizationImprove oxidation efficiencyCombination devicesCycloneFlue gas
The invention discloses a multi-stage absorbing desulfurizing device by adopting an ammonia-ammonium sulfate method. The absorbing desulfurizing device comprises a flue gas desulfurizing absorption tower, an absorption liquid circulating tank, a thin slurry circulating tank and a wet-type electric dust remover, wherein the flue gas desulfurizing absorption tower comprises a concentrated slurry circulating tank, a concentration pre-absorption section, an absorption section, a thin slurry washing section and a defogging section that are arranged in a vertical manner; the concentration pre-absorption section comprises at least a layer of concentrated slurry spraying layer; the absorption section comprises an absorption liquid cyclone defogging liquid collector and at least a layer of absorption liquid spraying layer; the thin slurry washing section comprises a thin slurry cyclone defogging liquid collector and a thin slurry spraying layer; the defogging section comprises a defogger and a defogger washing spraying layer. According to the multi-stage absorbing desulfurizing device by adopting the ammonia-ammonium sulfate method, provided by the invention, flue gas cooling, multi-stage defogging absorption and multi-section oxidization are completed in the desulfurizing absorption tower, the utilization rate of ammonia is increased by regulating the ammonia adding positions, and the problems that the concentration of slurry in multiple sections is controlled unsatisfactorily, and the content of aerosol in flue gas after desulfurization is too high are solved, wherein the problems are caused due to the fact that although the conventional desulfurizing absorption tower is divided into multiple sections, slurry in the multiple sections are carried with gases heavily.
Owner:SINOPEC NANJING ENG & CONSTR +1
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