63results about How to "Low connection temperature" patented technology

The present invention relates to the connection method of SiC particle reinforced Al-base composite material (SiCp/Al), and is especially instantaneous liquid phase diffusion connecting technology of SiCp/Al. The present invention realizes the metallurgical combination between samples with mixed Al, Ag, Cu and Ti powder as the intermediate layer, and through the ternary eutectic reaction of Al, Ag and Cu and certain time of component diffusion and homogenization. The technological process includes compounding the intermediate layer, surface treatment of the mother material to be connected, setting the mixed powder slurry compounded with anhydrous alcohol to the surface of the mother material, heating in vacuum furnace for certain time and cooling in the furnace. The said process can connect SiCp/Al parts with complicated structure and has the features of low connection temperature, less damage to mother material, etc.

The invention discloses a ceramic substrate copper cladding low-temperature connection method for a power module. The method includes the following steps that firstly, a ceramic substrate and oxygen-free copper are subject to surface treatment, and then are subject to acetone washing; secondly, Ag powder, Cu powder, Sn powder and Ti powder or the Ag powder, the Cu powder, In powder and the Ti powder are mixed to form metal powder, an organic binder is added into the metal powder, and a mixture is placed into a ball milling tank for mechanical ball milling so as to prepare active brazing filler metal paste; and thirdly, samples are assembled from top to bottom according to the sequence of the oxygen-free copper/ active brazing filler metal /the ceramic substrate, and connection is achieved in a vacuum brazing furnace. According to the method, the manner that low-melting-point elements are added into the active brazing filler metal is adopted, the connection temperature of the oxygen-free copper and the ceramic substrate is reduced, residual stress in the substrate is reduced, and the service life is prolonged.

The invention belongs to the technical field of manufacturing of targets, and particularly relates to a method for adhesively connecting a target and a backboard. The method comprises the following steps: providing the target and the backboard; processing an adhesion surface of the target and the backboard; evenly coating and adhering required organic glue on the adhesion surface of the target and the backboard; adhering the target and the backboard, and using a normal-temperature solidifying or low-temperature solidifying mode to guarantee reliable adhesion. The organic glue is used in adhesion to achieve the reliable connection of the target at the normal temperature or low temperature, the excellent thermal conductivity and electric conductivity and the enough connection strength are guaranteed in the sputtering process of the target, meanwhile, the connection temperature is reduced, so that the problems of target fragmentation, deformation and the like possibly caused by high-temperature heating are avoided, the requirement of connection of the special target at the normal temperature is met, meanwhile, the operation difficulty is lowered, and the yield is improved.

A superplastic diffusion process for joining different alloys includes high-speed laser fusing or alloying the surfaces of alloys to be joined, and superplastic diffusion. The alloy component used in laser alloying is same as the alloy with superplastic potential at lower temp. It combines laser surface modification with superplastic diffusion join.

The invention discloses an SPS connecting method of WRe/TZM/graphite. The SPS connecting method comprises the steps that a graphite gradient mould is adopted, gradient sintering of WRe alloy powder and TZM alloy powder is achieved through an SPS technology, and a titanium foil serves as an intermediate transition layer to achieve dissimilar material connection between the TZM alloy powder and a graphite block body, so that a WRe/TZM/graphite dissimilar material connecting piece is obtained. Through the connecting method, the WRe/TZM/graphite dissimilar material connecting piece which is densein sintering, uniform in connecting surface diffusion, high in bonding strength, good in heat dissipation performance and good in thermal shock resistance can be obtained, the density of a WRe alloy layer reaches 98.07%, the density of a TZM alloy layer reaches 97.98%, the connecting surface diffusion is uniform, the connector room temperature shearing strength of the WRe/TZM side can reach 303.9MPa, and the connector room temperature shearing strength of the TZM/graphite side can reach 31.2 MPa.

The invention relates to a magnesium alloy honeycomb structure material and a preparation method thereof, belonging to the technical field of composite materials, and characterizing in that the magnesium alloy honeycomb structure material has high bonding strength, can be used without finish machining of a connecting interface and has high-temperature resistance, and the method is a semi-solid soldering method based on ultrasonic assistance. The magnesium alloy honeycomb structure material is formed by connecting upper and lower panels with ultrasonic assisted liquid with a honeycomb core structure together, wherein the thickness of the upper and lower panels is 1-4.5mm, the thickness of a magnesium alloy thin plate of the honeycomb core structure is 0.5-0.8mm, and the width of the thin plate is 10-50mm. The magnesium alloy honeycomb structure material manufactured by using the ultrasonic assisted liquid for connection can be used at a high temperature, and the strength of the magnesium alloy honeycomb structure material is 25-35Mpa. A magnesium alloy honeycomb plate prepared from the magnesium alloy honeycomb structure material is high in strength, lightweight and high-temperature resistant, can be widely used in modern means of communication and transportation such as space vehicles, aerial vehicles, high-speed rails, urban rail trains and the like, and can be used as components of wall plates, floors, sound-proof materials and the like.

The invention discloses a low-temperature diffusion bonding method for adding quasi-crystal interlayers to aluminum-steel-aluminum. The method includes the main steps that quasi-crystal aluminum silicon copper middle transition alloy foil sheets are arranged between contact interfaces to be welded of aluminum plates and contact interfaces to be welded of a low-carbon steel plate, vacuum diffusion bonding is conducted, processing parameters are that the bonding temperature is controlled in the range of 420 degrees to 490 degrees, the heat preservation time under the bonding temperature ranges from 15 min to 25 min, the pressure ranges from 0.3 MPa to 0.9 MPa, and the vacuum degree is 1.33*10<-3> Pa-1.33*10<-2> Pa. By means of the method, low-temperature diffusion bonding of the aluminum and the low-carbon steel can be achieved, the diffusion interfaces of the formed aluminum-steel-aluminum composite structure is firm in combination, reliable in bonding quality and high in production efficiency. The low-temperature diffusion bonding method for adding the quasi-crystal interlayers to aluminum-steel-aluminum has the advantages of being precise in processing parameter control, low in cost and the like, and the bonding temperature can be reduced.

The invention discloses a manufacturing method of a W/Mo/graphite composite anode target material for an X-ray tube of a CT machine. According to the manufacturing method, a tungsten plate, a molybdenum cylinder and a graphite block are used as raw material. The manufacturing method comprises the step 1 of machining the tungsten plate and the molybdenum cylinder according to the required shape andsize of the anode target material, ensuring that the size of the outer circumferences of the machined tungsten plate and molybdenum cylinder have allowance on the basis of the required size of the outer circumference of the anode target material; the step 2 of performing SPS diffusion connection on the machined tungsten plate and molybdenum cylinder to obtain a W/Mo connecting piece; and the step3 of machining the W/Mo connecting piece and the graphite block according to the required shape and size of the anode target material, and performing SPS diffusion connection on the machined W/Mo connecting piece and the graphite block to obtain the W/Mo/graphite composite anode target material. According to the manufacturing method, the W/Mo/graphite composite anode target material has the advantages of being high in density, high in bonding strength of the W/Mo alloy layer and the Mo/graphite alloy layer, good in heat dissipation, good in resistance to heat shock, long in service life and the like.

The invention discloses a diffusion connection method of a ternary layered ceramic carbon silicide and metallic chromium and belongs to the technical field of connection between the ceramic and metal.The method comprises carrying out surface treatment on ternary layered ceramic and metallic chromium, then carrying out grinding, polishing and ultrasonic cleaning, then installing the ternary layered ceramic and metallic chromium in a hot press furnace, vacuumizing the hot press furnace, carrying out heating when the vacuum degree in the hot press furnace is 5*10<-2> Pa, carrying out heat preservation at a temperature of 1000-1200 DEG C under the constant pressure of 20-30 MPa for 30-90min so that the diffusion connection of the ternary layered ceramic and metallic chromium is realized, thencarrying out cooling to 200 DEG C under original vacuum conditions and releasing the pressure. The joint obtained by the method has good interface bonding and satisfies practical application requirements. The method widens a ternary layered ceramic carbon silicide application range.

The invention discloses an SPS diffusion welding method for DD98 congeneric nickel-based mono-crystalline high-temperature alloy. A Ni-Cr-W-B-Si-Fe powder solder is used as a middle transition layer, and effective connection of the DD98 congeneric nickel-based mono-crystalline high-temperature alloy is achieved at low temperature within short time through the spark plasma sintering technology. Through the welding method, it can be ensured that a base metal is not crystallized, stable and reliable joints with refined welding line crystalline grains and uniformly dispersed connecting faces are obtained, and the room-temperature shear strength of the joints can reach 301 MPa.

The invention relates to a diffusion bonding method of ternary layered ceramic titanium-silicon-carbon and solid solution thereof and ferritic stainless steel based on a Ni foil intermediate layer. The method comprises the following steps: gradually polishing the to-be-bonded surfaces of ternary layered ceramic and ferritic stainless steel by using metallographic abrasive paper, and polishing by using diamond abrasive paste; cleaning the Ni foil to remove impurities such as oil stains on the surface; arranging according to the sequence of ternary layered ceramic/Ni foil/ferritic stainless steel, welding a temperature measuring platinum wire on the side surface of the sample, and carrying out diffusion bonding on the welded sample; and after the connection experiment is completed, performing cooling and pressure relief to obtain the diffusion connection joint. The joint obtained by adopting the method provided by the invention is good in interface bonding, low in connection temperatureand good in use performance and mechanical property, a continuous reaction layer is generated on the interface, welding defects such as cracks and air holes are avoided, the problem of Cr volatilization of an alloy connector can be solved, and the preparation and processing cost of a ceramic connector is reduced; and the application range of the ternary layered ceramic Ti3SiC2 and the solid solution material thereof is expanded.

The invention discloses a ternary lamellar ceramic titanium silicon carbide and metallic nickel diffusion bonding method and belongs to the technical field of ceramic and metal bonding. The method comprises the steps that firstly, surface treatment is conducted on ternary lamellar ceramic and metallic nickel, and then the ternary lamellar ceramic and the metallic nickel are grinded, polished and ultrasonically cleaned; then, the ternary lamellar ceramic and the metallic nickel are installed in a hot-pressing furnace, and the hot-pressing furnace is vacuumized; when the vacuum degree of the hot-pressing furnace is up to 5*10-2 Pa, heating begins, constant-pressure heat preservation is performed at the temperature of 800-1100 DEG C and under the pressure of 6-20 MPa, so that diffusion bonding is conducted on the ternary lamellar ceramic and the metallic nickel; after bonding is completed, cooling is performed under the original vacuum condition to reach 200 DEG C, and then pressure relief is performed. The shear strength of a diffusion bonding joint obtained by adopting the method can be up to 121 MPa and is approximate to the shear strength of Ti3SiC2 ceramic, the actual application demand can be met, and accordingly the application range of ternary lamellar ceramic titanium silicon carbide is widened.

The invention relates to magnetic nanocrystalline glass brazing filler metal, a preparation method thereof and a method for connecting ferrite through the magnetic nanocrystalline glass brazing fillermetal, and belongs to the technical field of ferrite welding. The component of the glass brazing filler metal provided by the invention is xBi2O3-yCoO-yFe2O3-10B2O3 (mol.%, x=30-40 and y=25-35), andthe physical and chemical properties of the glass brazing filler metal are close to those of ferrite. The magnetic brazing filler metal sheet and the base metal obtained after low-temperature glass pre-melting are subjected to composite connection, and structural stability and performance stability of long-term service of the microwave ferrite device are achieved while reliable connection of ferrite and the magnetic performance of a weld joint are guaranteed. According to the method, the unification of the electromagnetic properties of the glass weld joint and the ferrite base metal can be realized, the green concept of energy conservation and sustainable development is met, and the method has important application value for ferrite connection and even microwave device processing.

The invention discloses a vacuum brazing connection method for C/C radiating fins and Ti tubes. The method comprises the following specific process steps: grinding and polishing a Ti pipe to remove an oxide film, and performing vacuum drying for later use after ultrasonic cleaning; tiZrNiCu alloy powder and TiC powder with the mass percent being 3%-5% are mixed, then alcohol is added for ball milling for 15-18 h, the powder is dried and sieved after ball milling, then an oily binder with the mass percent being 8%-10% is added into sieved powder, the mixture is stirred into paste brazing filler metal, then the portion between the connecting surfaces of the C/C cooling fins and the Ti pipe is filled with the paste brazing filler metal, assembling is conducted, and the C/C cooling fins and the Ti pipe are assembled. And the assembly part is clamped by a graphite clamp and then placed in a vacuum furnace, the temperature is increased to 920 DEG C at the speed of 4-7 DEG C/min under the vacuum degree not lower than 1 * 10 <-3 > Pa, heat preservation is conducted for 10-20 min, and finally connection is completed after the furnace is cooled to the room temperature. The connecting method is simple in process, safe, free of pollution, low in cost and high in reliability, and the problems that in the welding process, due to large residual stress, a connecting piece cracks, and wettability between base metal is insufficient are effectively solved.