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58results about How to "Well combined" patented technology

Vacuum electron beam brazed joint method of tungsten/low activation steel

The invention discloses a vacuum electron beam brazed joint method of tungsten/low activation steel, belonging to the field of metal materials. According to the method, with an amorphous state T-based belt as brazing filler metal, the tungsten and the low activation steel are subjected to the brazed joint by using the vacuum electron beam braze technology wherein the amorphous state T-based belt contains 30-50 percent by weight of Ti, 30-50 percent by weight of Zr, 10-15 percent by weight of Cu and 5-10 percent by weight of Ni. During soldering, the scanning and the heating are carried out on the electron beam surface from the surface of the tungsten under the conditions that the temperature is controlled to 800-1,200DEG C, the work vacuum degree in the chamber is 1.0-5.0*10<-3>Pa, the accelerating voltage is 100-150KV, the focusing current is 100-600mA, the electron beam current is 1-10mA and the scanning frequency is 0.1-1KHz. The coil is scanned at high frequency by controlling through a computer and the heating time is 1-5 minutes. By using the method, the tungsten and the low activation steel are connected in a short time with high efficiency; and the weld seam interface can be better combined and has no defects of pore, inclusion, cracks and the like. The invention can be widely applied to connecting components of a helium cooled partial filter in a magnetic-confinement nuclear fusion experimental device.
Owner:UNIV OF SCI & TECH BEIJING

Aluminum alloy surface B4C particle reinforced Al base composite cladding layer and preparation method

The invention discloses an aluminum alloy surface B4C particle reinforced Al base composite cladding layer and a preparation method, overcomes the problem that a traditional technology is difficult to remove compact oxide films quickly grown on surfaces of aluminum and an alloy of the aluminum, solves the problems of difficult powder feeding due to light mass of B4C particles and weak wettability with aluminum alloy molten liquid, and effectively leads the B4C particles in the aluminum alloy surface layer to form an Al base composite cladding layer with excellent metallurgic bonding. In cooperation with the powder-wire composite cladding technical scheme, by using consumable electrode inert gas protective welding-MIG welding, aluminum alloy welding wires are transited to the aluminum alloy wire, the side injection of the B4C particles is assisted to fuse in the Al base cladding layer, that is, the B4C particle reinforced Al base composite cladding layer is prepared on the aluminum alloy surface. The B4C particle reinforced Al base composite cladding layer and an aluminum alloy substrate are excellently bonded, and the B4C particles in the cladding layer and an Al matrix are excellently bonded, and obvious defects such as air holes and cracks are avoided; and the aluminum alloy surface B4C particle reinforced Al base composite cladding layer is higher in wear resistance compared with 45 steel.
Owner:HUBEI UNIV OF AUTOMOTIVE TECH

Method for preparing copper-coated aluminium composite material

The invention relates to a method for preparing a copper-coated aluminium composite material. The method comprises the following steps: spinning the head of a copper tube which is utilized as a raw material to form a cone, turning the head of the aluminium bar which is utilized as a raw material to form a cone, mechanically polishing the aluminium bar and then sleeving the aluminium bar with the copper tube to form an extrusion billet; coating a colloidal graphite lubricating film on the exterior of the extrusion billet and carrying out copper and aluminium soldering and sealing on the tail of the extrusion billet; ensuring the container temperature of a hot hydrostatic extruder to be 350-450 DEG C, the temperature of an extruding die to be 150-350 DEG C, the temperature of the copper tube forming the extrusion billet to be 350-450 DEG C and the temperature of the aluminium bar to be 150-250 DEG C; and feeding the extrusion billet into the container, filling extrusion media and then carrying out hydrostatic extrusion, thus obtaining the copper-coated aluminium composite material, wherein the internal diameter of the copper tube is the same as the external diameter of the aluminium bar; and the extrusion ratio is 4-100. The method has the following beneficial effects: the copper-coated aluminium composite material prepared by the method has high copper/aluminium interface bond strength and good bending and forming performance; the frequency of annealing needed in the preparation process is low and the annealing temperature is low; and the production procedure is simplified and the production cost is lowered.
Owner:厦门火炬特种金属材料有限公司

Ni3(Si,Ti)-WC composite coating material and preparation method thereof

The present invention relates to a laser cladding nickel silicon titanium - tungsten carbide composite coating material and a method for preparation the same; the propose of the invention is to prepare a composite coating consisting of intermetallic compound of Ni3 (Si, Ti), a Ni-based solid solution, TiC coated WC ceramic on a high-temperature ultratek substrate by laser cladding; the coating material mainly comprises Ni powder, Si powder, Ti powder and WC powder with the following weight percentages: 8 percent to 20 percent WC, 78 percent Ni, 13 percent Si and 9 percent Ti; the preparation method adopts the laser to clad and has the following technique parameters: the output power is between 1200 W and 1500 W; the scanning speed is 4-8 mm/s; the spot diameter is 4 mm; the protective gas is Ar gas in cladding; the cladding substrate material is high-temperature ultratek; the invention has the following procedures: according to the mixing ratio, the coating material is mixed uniformly and pre-coated or hot-sprayed on the surface of the high-temperature ultratek substrate with the thickness between 0.8 mm and 1.0 mm; the laser scans cladding with multilayer and multi-path; each path has related joint of 1.8 mm, thereby achieving the cladding layer with different thickness.
Owner:LANZHOU UNIVERSITY OF TECHNOLOGY

Preparation method and device for fiber reinforced metal matrix composite

The invention provides a preparation method for a fiber reinforced metal matrix composite. Good bonding between a matrix alloy and a fiber mesh and between the matrix alloy and a settled layer is realized by adopting the preparation method. The invention further provides a preparation device for realizing the preparation method and application of the preparation device. The preparation device can realize thickness control over a metal matrix layer between fiber layers and uniform distribution of fibers or enhancement of graded fibers. The preparation device can be used for preparing molten-state metal alloys of an aluminium alloy, a tin alloy, a lead alloy, a copper alloy, an iron alloy and a titanium alloy, and tubular bases made of an aluminium-base alloy, a copper-base alloy, an iron-base alloy, a tin-base alloy and a lead-base alloy. The preparation method and device can realize regulation of the thickness of the metal matrix layer between the fiber layers; the shorter the rotation interval time of a matrix rotating shaft is, the smaller the thickness of the metal matrix layer is, and otherwise, the larger the thickness of the metal matrix layer is; and progressive regulation of the rotation interval time can be realized by a controller, and enhancement of the graded fibers is conveniently realized.
Owner:HUAIHAI INST OF TECH

Method for preparing Ti-TiBw/Ti laminar composite material in diffusion welding mode

The invention relates to a method for preparing a Ti-TiBw/Ti composite material of a laminar structure, in particular to a method for preparing the Ti-TiBw/Ti laminar composite material in a diffusion welding mode. The method for preparing the Ti-TiBw/Ti laminar composite material in the diffusion welding mode solves the technical problem that the flatness and uniformity of an exiting laminar titanium matrix composite material layer are difficult to guarantee, and comprises the steps of weighing raw materials, preparing Ti-TiBw/Ti composite material, preparing Ti-TiBw/Ti composite material foils, and preparing the Ti-TiBw/Ti laminar composite material. The Ti-TiBw/Ti laminar composite material prepared through the method has good flatness and uniformity and is high in compactness, the compactness can reach 99.3%, the high plasticity and strengthening-toughening performance of the laminar material can be controlled by adjusting the thickness of a Ti board, the thickness of a Ti-TiBw/Ti composite material board, the layer thickness ratio between the Ti board and the Ti-TiBw/Ti composite material board, and the volume fraction of an enhanceosome, and breaking tenacity of the Ti-TiBw/Ti laminar composite material is largely improved.
Owner:HARBIN INST OF TECH

Method for preparing bone screw biological compound material

The invention provides a method for making a coaptation nail biological composite material, comprising the following steps of: firstly, soaking a carbon fiber with dimethyl sulfoxide liquid after pre-oxidizing the carbon fiber with nitric acid; then, orderly adding the carbon fiber and Ca(NO3)2.4H2O, K2HPO4 into acetic acid solution; after undergoing ultrasonic dispersion, adding glutaraldehyde solution to obtain solution A; extracting the solution A and adding chitosan; then placing in a ultrasound wave cleaning device to oscillate; and keeping stand to deaerate; slowly pouring the deaerated chitosan solution into a mould; placing the mould in NaOH solidification liquid to soak; placing the formed gel into a vacuum drying box to dry and solidify; and obtaining the desired product. The synthesized composite material has the advantages of higher flexural strength and compressive strength, even dispersion of the made composite material fiber, good combination of the fiber and a matrix interface, wherein the flexural strength of the composite material is between 35 and 90 MPa, the compressive strength is between 30 and 75 MPa, and bending modulus is up to between 250 and 320 MPa, and the flexural strength and flexibility of the material are higher than the flexural strength and flexibility of the single chitosan and hydroxyapatite, thereby having mechanical properties required by the coaptation nail.
Owner:SHAANXI UNIV OF SCI & TECH

Device and method for preparing transfer lubricant film on surfaces of ceramic balls

The invention discloses a device and a method for preparing a transfer lubricant film on the surfaces of ceramic balls and relates to a device and a method for preparing a lubricant coating on the surfaces of ceramic balls. The invention aims at solving the problem that the self-lubricant coating of the ceramic balls prepared by the existing method has weak bonding force and is uneven. The device comprises a first spring; the upper end of the first spring is connected with a load assembly, while the lower end therof is connected with an upper grinding disc pedestal; an upper grinding disc is arranged in the upper grinding disc pedestal and a lower grinding disc is arranged in a lower grinding disc pedestal which is connected with a rotation speed control assembly; the lower grinding disc is fixed in the lower grinding disc pedestal by four second positioning bolts; a retainer is arranged on the lower grinding disc and a plurality of round holes thereon are opposite to a V-shaped groove. The method comprises the steps: ceramic balls roll freely in the V-shaped groove and slide and grind with the upper grinding disc and the lower grinding disc; and composite materials are ground on the surface of the ceramic balls. The invention causes the surfaces of the ceramic balls to have a self-lubricant coating. The ceramic balls roll and grind between the upper grinding disc and the lower grinding disc and form a lubricant film with even thickness on the surfaces of the ceramic balls.
Owner:HARBIN INST OF TECH

Method for depositing silicon carbide high radiation coating on cobalt based high-temperature alloy surface

The invention discloses method to deposit silicon carbide high radiation coating on the surface of the cobalt based high temperature alloy surface, which in particular relates to a technology method to deposit silicon carbide high radiation coating on the surface of the cobalt based high temperature alloy surface. The method solves the problem that good binding between the silicon carbide coating and the cobalt based high temperature alloy is difficult to realize through the commonly used magnetism control sputtering method. The method of the invention comprises the procedures: firstly, the cobalt based high temperature alloy is cleaned with hydrofluoric acid, acetone solution ultrasonic wave, alcoholic solution ultrasonic wave and deionized water. secondly, the processed cobalt based high temperature alloy is fed into a magnetism control sputtering vacuum chamber, the sputtering vacuum chamber is vacuumize, the cobalt based high temperature alloy is heated and the temperature is retained; thirdly, Ar gas is filled into the chamber, and pulse negative bias voltage is exerted to perform reverse sputtering to the cobalt based high temperature alloy surface; fourthly, sputtering power glow is started, to perform pre-sputtering to the silicon carbide coating surface; fifthly, the formal sputtering is performed to the silicon carbide coating surface, to deposit silicon carbide high radiation coating; sixthly, the power source is shut off, and when the temperature in the chamber is reduced to the room temperature, the deposition is completed.
Owner:HARBIN INST OF TECH

Preparation method of porous biological activity ceramic film on surface of porous pure titanium or titanium alloy with lattice structure and application thereof

The invention discloses a preparation method of a porous biological activity ceramic film on a surface of a porous pure titanium or titanium alloy with a lattice structure and application thereof, and belongs to the technical field of metal surface treatment. The method comprises chemical polishing, preparation of a prefabricated oxide film under direct-current voltage, and preparation of the porous biological activity ceramic film under square wave pulse voltage. The chemical polishing is a chemical acid washing method. The oxide film prefabrication is a low-voltage direct-current anodic oxidation method; and a porous biologic activity functional ceramic layer adopts a micro arc oxidation preparation method. The ceramic layer obtained by the method is firm in combination with a basal body, has a micron-size cellular structure on the surface, can singly serve as a biologic functional coating layer, and can be subsequently treated to prepare a composite functional coating layer higher in corrosion resistance, wear resistance, biologic activity and bacteria resistance. An interbody fusion cage for the field of orthopedics or an implant for the field of dentistry manufactured based on the method shortens the synostosis time of the implant body.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

Method for recycling CBN (Cubic Boron Nitride) abrasive from waste product obtained by producing ceramic bonding agent CBN grinding wheel

ActiveCN106675517AThe structure of the grinding wheel is uniformWell combinedOther chemical processesAir atmosphereQuenching
The invention discloses a process for recycling a CBN (Cubic Boron Nitride) abrasive in a ceramic bonding agent CBN grinding wheel waste product by a chemical etching method. The process comprises the following steps: heating a ceramic bonding agent CBN grinding wheel in an air atmosphere to be 500 to 550DEG C, and insulating for 1 to 2 hours; cooling the grinding wheel along with a furnace and then separating a ceramic CBN working layer from a metallic matrix; cleaning the ceramic bonding agent CBN working layer by ultrasonic waves, then putting into an electric furnace and heating to be 550DEG C; carrying out water quenching and then carrying out ball milling for a short time of 4 to 6 minutes, and breaking into powder; taking ceramic bonding agent CBN grinding wheel powder, impregnating into a NaOH solution at the temperature of 80 to 95DEG C, insulating for 3 to 5 hours and flushing to be neutral; subsequently impregnating the powder into an HF solution at the temperature of 80 to 95DEG C, insulating for 3 to 5 hours and flushing to be neutral; finally, enabling residual powder to pass through a corresponding screen mesh, thus obtaining CBN recycled abrasive of which the purity is higher and the grit size meets the service requirement. The problem that waste products generated by the ceramic bonding agent CBN grinding wheel in sintering and processing procedures are difficult to recycle is solved.
Owner:江苏华东砂轮有限公司

Graphite/Cu alloy connector and preparation method thereof

The invention discloses a graphite/Cu alloy connector and a preparation method thereof. A connection layer of the graphite/Cu alloy connector is of a sandwich type composite structure and comprises a Cu-TiH2-Ni layer connected with graphite, an Ag-Cu layer connected with Cu alloy, and a Cu layer located between the Cu-TiH2-Ni layer and the Ag-Cu layer. The preparation method of the graphite/Cu alloy connector comprises the following steps that (1) Cu powder, TiH2 powder and Ni powder are uniformly mixed and added with ethyl alcohol to be ground, so that Cu-TiH2-Ni mixed powder solder is obtained; (2) an appropriate amount of the Cu-TiH2-Ni mixed powder solder is taken and added with a little of absolute ethyl alcohol and glycerol drop by drop, so that thick cream solder is prepared; and (3) the cream solder is evenly smeared on the surface of the graphite, then, Cu foil and Ag-Cu foil are put on the cream solder in sequence, finally the Cu alloy is put, the mixture is overall put into a mold, and the connector is obtained after brazing. The graphite/Cu alloy connector prepared through the method is good in interface bonding and high in connection strength, and the problems that the wettability of copper on the surface of the graphite is poor, and residual thermal stress occurs due to the large thermal expansion coefficient difference between the graphite and the copper alloy are solved.
Owner:WUHAN INSTITUTE OF TECHNOLOGY

University science and technology park digital information management system

The invention belongs to the technical field of network information systems, and discloses a university science and technology park digital information management system comprising an enterprise management module used for examining and approving enterprises which do not enter a science park; the scientific and technological achievement and conversion module is used for managing and counting scientific and technological achievements and conversion conditions thereof; the enterprise demand management module is used for managing demands submitted by science park enterprises; the project library management module is used for managing project application information and project establishment information of teachers or science park enterprises; the expert database and review module comprises anexpert database management sub-function module and an expert review sub-function module; and the intellectual property service module comprises a patent application agency service sub-function moduleand a proposal/teaching material publishing service sub-function module. The system gathers various resources, builds a communication bridge for scientific and technological achievements and enterprise demands, promotes the combination of industry, universities and studies, and achieves the efficient combination of science and technology and economic benefits.
Owner:四川西华科技园管理有限责任公司
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