221 results about "Diffusion bonding" patented technology

The invention belongs to the technical field of composite material preparation, and particularly relates to a preparation method of a SiCf / TiMoNb heterogeneous core material reinforced GH4169 composite material. The preparation method comprises the following steps: depositing a TiMoNb alloy matrix on the surface of SiC fiber by using a magnetron sputtering method to form a precursor wire, carrying out composite molding on the obtained precursor wire and a GH4169 sheath in a hot isostatic pressing manner, and carrying out diffusion bonding to form the composite material. The obtained composite material SiCf / TiMoNb / GH4169 has excellent unidirectional performance at high temperature, the tensile strength at 850 DEG C can reach 1057 MPa, and the high-temperature strength of GH4169 alloy is effectively improved. The prepared composite material is high in high-temperature strength and has good application prospects, and the adopted preparation process is mature in technology and little in pollution.

The invention discloses a method for realizing low-temperature diffusion bonding of zirconium and alloy thereof based on a constant-current electric field, and relates to the technical field of material bonding. The method aims at solving the problems that in current direct diffusion bonding of zirconium and zirconium alloy, the joint strength is low at the low bonding temperature, and base metal performance is reduced and post-welding deformation is large at the high bonding temperature. According to the method, hole closing and atomic diffusion at a diffusion connection interface are jointly promoted mainly through the electromigration effect under the action of the constant-current electric field, the vacancy concentration of zirconium and the alloy thereof improved by the constant-current electric field, and high-temperature plasticity, so that the high-strength zirconium and the alloy connector thereof are obtained at low temperature. The method for realizing low-temperature diffusion bonding of the zirconium and the zirconium alloy under the action of the constant-current electric field can be obtained.

The invention discloses a molded surface pre-dispersion superplastic forming / diffusion bonding method, and belongs to the field of superplastic forming. The method solves the problem that when an ultrathin hollow multilayer structure is formed through an existing superplastic forming / diffusion bonding method, the wall thickness is not uniform due to excessive deformation of a core plate. According to the method, the core plate is subjected to large plastic deformation through a pre-reverse expansion method, stress concentration in a material is released, then the protruding part is subjected to plastic deformation through forward expansion, the core plate is subjected to plastic deformation in the reverse expansion stage, stress is more evenly distributed in the forward expansion stage, and therefore the situation that in a local area, the stress concentration in the material is reduced is avoided. And particularly, the phenomena of excessive deformation and thinning of high-strain parts such as fillets and the like are avoided, so that the uniformity of the wall thickness is greatly improved. The method provided by the invention comprises the following steps: (1) pre-forming a core plate and welding isolation ribs; (2) panel forming; (3) combining the core plate and the panel; (4) carrying out reverse expansion on the core plate; and (5) superplastic forming of the core plate.

The invention relates to the technical field of vacuum brazing, and discloses a vacuum brazing method for a needle array radiator, which comprises the following steps of: fusing reference process parameters of a historical process knowledge base and multi-dimensional characteristic parameters of the needle array radiator to obtain brazing process characteristic parameters; performing process strategy matching on the needle array radiator to confirm a vacuum brazing strategy of the needle array radiator; a vacuum brazing strategy is applied, and a vacuum brazing furnace is driven to execute stage process operation of preheating degassing, brazing filler metal melting and spreading, diffusion bonding and controllable cooling; performing situation analysis on the real-time process data flow of the stage process operation to obtain deviation data; dynamic parameter reconstruction is conducted on the target brazing stage of the needle array radiator, and temperature regulation and control parameters and process logic parameters are obtained; the needle array radiator is subjected to circulating brazing control, and a post-welding component of the needle array radiator is obtained; the efficiency of the vacuum brazing method for the needle array radiator can be improved.

The invention discloses a self-constrained diffusion bonding nickel-tungsten alloy composite base band billet and a preparation method thereof, and belongs to the technical field of preparation of metal base band billets for high-temperature coating superconductors. According to the method, a high-tungsten alloy bar with an interference size is pressed into a hollow low-tungsten alloy pipe, and the tubular structure restrains displacement, so that contact interfaces extrude each other to generate plastic deformation. And the deformation amount of the alloy interface is larger than the critical deformation amount, recrystallization occurs at the high temperature to accelerate diffusion of atoms, metallurgical bonding is achieved, and the nickel-tungsten alloy composite base band billet of the three-layer sandwich structure is obtained. Plastic deformation generated between layers through self-constraint drives recrystallization and promotes element diffusion to form metallurgical bonding in the thermal activation process, and the probability of the cracking phenomenon of the cold-rolled nickel-tungsten alloy composite base band can be remarkably reduced; the preparation method is a preparation mode for realizing the ultra-long metal base band billet with a sharp cubic texture surface, high strength and low magnetism; and the surface texture content, the magnetism and the strength of the composite base band can be flexibly regulated and controlled by matching nickel-tungsten alloy bars with different components, shapes and sizes.

The invention provides a preparation method of a micro-channel pipe structural member for a liquid cooling plate, and belongs to the technical field of liquid cooling plates. The invention discloses a preparation method of a micro-channel pipe structural member for a liquid cooling plate. The preparation method comprises the following steps: S1, preparing raw materials for forming the liquid cooling plate; s2, carrying out roll bending forming treatment on the upper wallboard raw material; s3, roll bending forming treatment is conducted on the lower wall plate raw material; s4, the micro-channel pipe raw material is subjected to roll bending forming treatment; s5, the upper wall plate structural part, the lower wall plate structural part and the micro-channel pipe structural part which are subjected to roll bending forming treatment are connected and fixed through brazing, and a final three-layer structural part is assembled; and S6, a cooling water nozzle is installed at the position of the micro-channel pipe structural part. According to the method, roll bending is conducted firstly, then welding is conducted, the method has the advantages of being efficient and rapid in forming, integrated forming can be achieved on complex profiles through the process, high-temperature diffusion bonding is avoided, and therefore the service life of the three-layer plate is greatly prolonged, and the mechanical property of formed components is greatly improved.

The invention discloses a Cu and secondary aluminum cast-rolling solid-liquid composite material and a preparation method thereof, and relates to the field of metal recycling, the Cu and secondary aluminum cast-rolling solid-liquid composite material comprises a Cu layer and a secondary aluminum layer, and the Cu layer and the secondary aluminum layer form metallurgical bonding at an interface through a cast-rolling process; a diffusion bonding layer with components changing in a gradient manner exists at the interface, the thickness of the diffusion bonding layer is 5-50 microns, and a continuous or discontinuous intermetallic compound layer is generated in the diffusion bonding layer; according to the Cu and secondary aluminum cast-rolling solid-liquid composite material and the preparation method thereof, through a pre-oxidation-cast-rolling composite technology, a compact Cu2O film is prepared on the surface of Cu in advance, and a controllable reduction-diffusion reaction occurs when the compact Cu2O film makes contact with a secondary aluminum melt; according to the process, an interface barrier is removed, and newly-generated active Cu atoms and Al atoms form a diffusion bonding layer with components changing in a gradient mode under rapid cooling and pressure of a casting roller.

The invention relates to a method for preparing a diffusion bonding layer on a nickel-based alloy and YSZ ceramic coating interface, and belongs to the technical field of metal material surface protection and ceramic coatings. According to the preparation method, a YSZ composite ceramic coating is deposited on the surface of the nickel-based alloy by adopting an electrophoretic deposition method, and then an MCr2O5 (M is Zr, Y, Ce, Yb and Al) diffusion bonding layer is prepared on the interface of the nickel-based alloy and the YSZ composite ceramic coating by adopting a pressureless discharge sintering and thermal diffusion treatment method. The bonding layer prepared through the diffusion method is good in interface bonding, the thermal stress between the nickel-based alloy and the YSZ ceramic coating is effectively buffered, the defects that a bonding layer prepared through a traditional method is large in pore impurity amount and the like can be overcome, and the bonding force between the ceramic coating and a base body and the high-temperature anti-oxidation and anti-stripping performance are remarkably improved.

The invention relates to the field of composite material preparation, and discloses a tubular composite material with an internal thread and external fin structure and a preparation technology thereof.The preparation technology comprises the steps that a titanium pipe is selected, and internal thread machining is conducted in the titanium pipe; a copper-aluminum alloy is adopted as a surface cladding layer of a titanium tube, a small amount of titanium is added into the copper-aluminum alloy, stirring is conducted through an electromagnetic stirrer, and a refining agent is added in the stirring process for refining; the preparation method comprises the following steps: melting copper-aluminum alloy liquid, pretreating a titanium tube, inserting the titanium tube, emptying the titanium tube, discharging liquid, and carrying out cladding traction to prepare a composite alloy tube; in the preparation process of the composite alloy pipe, cladding traction is carried out, and then diffusion bonding heat treatment is adopted; the composite alloy pipe is machined to obtain an internal-thread external-fin tubular composite material; the problems that a composite pipe is low in temperature resistance and pressure resistance, prone to deformation, damage and leakage after resisting high-pressure washing, weak in atmospheric corrosion resistance, low in heat exchange efficiency, high in production cost and low in production efficiency are solved.

The invention discloses a method for preparing a thin-wall part with a snakelike hollow channel by adopting superplastic forming / diffusion bonding. The method comprises the following specific steps: step 1, plate preparation and surface cleaning treatment; and step 2, solder resist coating: using a mask plate to deposit on a specific area of the plate and coating the solder resist according to an S-shaped shape, and removing the protective adhesive tape after spraying is completed. And 3, assembling and sealing, wherein the plates are stacked according to the design sequence, the edges are sealed and welded, and an air inlet / outlet is reserved to be connected with an air pipe. And 4, heating is conducted, specifically, the assembly is put into a mold, then the mold is uniformly put into a superplastic forming machine tool, and heating is conducted till the plate superplastic forming temperature is reached. And fifthly, diffusion bonding is conducted, specifically, uniform pressure is applied to the mold through a pressing head in the superplastic machine tool, so that diffusion bonding combination is conducted on the contact face, not coated with the solder resist, of the plate at high temperature and high pressure, and a connecting rib is formed. And 6, superplastic forming / diffusion bonding is conducted, specifically, the temperature is kept, and high-pressure inert gas is introduced into the assembly through a reserved air inlet according to an air pressure loading curve. And the plate coated with the solder resist is subjected to superplastic deformation and is attached to a mold cavity, diffusion connection between the plates is completed in the area not coated with the solder resist, and finally the needed thin-wall part with the serpentine channel cavity is formed. And 7, cooling and demolding are conducted, specifically, the thin-wall part with the snake-shaped hollow channel is taken out after cooling to the room temperature, and the residual solder resist is cleaned.

The invention relates to the technical field of metal heat treatment, in particular to a process for realizing diffusion bonding of dissimilar materials through a powder metallurgy process, which comprises the following steps of: controlling the mechanical property, the dimensional accuracy, the surface appearance and the structural integrity of a formed blank through selection of alloy elements, regulation and control of component proportion and optimization of additive components and content; the wear-resistant material powder is pressed into a blank, then the sintering temperature, the sintering time, the sintering pressure and other parameters are used for control, blank forming is achieved, the bonding strength of the blank and parts is improved, a steel-based typical structural part with local high wear resistance is manufactured, the strength and wear resistance of the mechanical parts are greatly improved, and the service life of the mechanical parts is greatly prolonged. The dissimilar material connecting process is suitable for engineering forming design and preparation production of locally-reinforced wear-resistant structural parts such as mining machinery, oil and gas pipelines, ocean platforms and bridge structures.

A modular lead connector for a medical device is described. The modular lead connector comprises an alumina ring having opposed first and second faces provided with respective first and second metallizations. First and second gold washers are contacted to the respective first and second metallizations, and the ceramic ring supporting the first and second gold washers is positioned between first and second titanium contact rings. Then, with the ceramic ring and the titanium contact rings being in axial alignment, they are hermetically connected to each other at respective first and second titanium / gold / alumina diffusion bonds. A lead connector assembly comprising at least two modular lead connectors in axial alignment and welded together is also described. An open sleeve is connected to a proximal-most one of the axially aligned modular lead connectors, and a terminal plate is welded to a distal-most one of the axially aligned modular lead connectors.

The invention provides a titanium-steel cylindrical part construction method, which belongs to the technical field of metal material welding and comprises the steps of sample pretreatment, sample placement and diffusion welding. According to the method, appropriate parameters such as diffusion welding temperature, time and pressure are selected, the axial load of diffusion bonding equipment is applied to the upper end of the titanium alloy cylindrical part, flowing deformation of ceramic particles is restrained through the outermost hard alloy or graphite jacket, the axial load is converted into radial load through the fluidity of the ceramic particles, and the axial load is applied to the upper end of the titanium alloy cylindrical part. The radial load acts on a laminated structure interface through the titanium alloy layer from outside to inside, a transition solid solution can be formed at the structure interface, good interface combination is achieved, meanwhile, mutual diffusion of titanium and iron elements is prevented through the existence of the middle layer, and formation of brittle ferrotitanium intermetallic compounds is avoided. The welding joint obtained through the method has the advantages of being good in combination, free of pores and cracks and the like.

This invention discloses a method and apparatus for fabricating complex hollow structures using pulsed DC and induction eddy current cyclic loading assisted diffusion bonding, relating to a method for assisted heating diffusion bonding. It achieves efficient and uniform heating of metallic materials. Step 1: Prepare a predetermined complex hollow metal structure to be diffuse bonded, polish and clean the surface of the complex hollow metal structure; Step 2: Place the complex hollow metal structure in a tooling mold for molding, and place the mold into a vacuum furnace; Step 3: Set up a dual-source control system; Step 4: Perform diffusion bonding under specified parameters, depressurize after the diffusion time is completed, and cool in the furnace until it reaches room temperature before removing the part. This invention combines pulsed DC heating and induction eddy current heating for diffusion bonding, improving diffusion efficiency while ensuring temperature uniformity, increasing the welding rate, and improving the quality of the diffusion joint.

The invention belongs to the field of hot isostatic pressure diffusion bonding, and particularly relates to a hot isostatic pressure diffusion bonding method for nickel-based alloy and niobium-based alloy. The method comprises the following steps of machining, sheath manufacturing, cleaning, assembling, packaging, leakage detecting, vacuumizing, clamping and sealing and hot isostatic pressing. According to the method, ODS copper is added to serve as a middle layer, a hot pressing system is controlled, reliable metallurgical bonding of a connection interface is achieved, no intermediate phase is generated, element transition of the connection interface is uniform, the whole body has high connection strength, the method can be used for manufacturing nickel-based alloy and niobium-based alloy connection parts in a fusion reactor, and the comprehensive use performance of materials can be met.

The invention provides a zirconium alloy surface nanocrystallization and self low-temperature diffusion bonding method, relates to the technical field of nuclear fuel element manufacturing, and solves the technical problems that existing zirconium low-temperature diffusion bonding can only realize connection of a certain small-size sample and a sample with a regular and flat surface and cannot be applied in an engineering manner. The method comprises the following steps that the surface roughness of the to-be-welded surface of the zirconium alloy is machined to be smaller than or equal to 1.6 micrometers; performing surface nanocrystallization treatment on the to-be-connected surface of the processed to-be-welded zirconium alloy test piece by adopting ultrasonic peening; the to-be-welded zirconium alloy test piece subjected to nanocrystallization treatment is accurately assembled and fixed through spot welding; and the assembled zirconium alloy test piece to be welded is subjected to diffusion bonding through a vacuum diffusion bonding technology. The machining difficulty of the to-be-welded test piece is reduced, and batch manufacturing can be achieved in the field of nuclear fuel element manufacturing; the method is suitable for processing complex structural members; and a product with high joint connection strength, uniform interface structure components and good corrosion resistance is obtained.

The invention discloses a method for diffusion bonding of titanium alloy and stainless steel by using an intermediate layer, which is characterized in that a layer of Ta material and a layer of Ag material are sequentially arranged between a titanium alloy workpiece and a stainless steel workpiece as the intermediate layer, and diffusion welding is realized by heating and pressurizing. The method is applied to diffusion welding connection between Ti alloy and stainless steel, and the problems of brittle phase generation, residual stress concentration, insufficient connection strength and the like caused by large thermal expansion coefficient difference and high interface reaction activity of dissimilar materials can be effectively solved. And the connection residual stress can be better reduced, the connection strength is improved, and the joint interface quality and the overall mechanical property are improved.

The present invention discloses a lightweight and high-strength Fe-Al composite plate for a finned tube radiator, its preparation method and application, belonging to the technical field of layered products composed of metals. The preparation method of the present invention includes the following steps: (1) Metal material treatment: Prepare iron sheets and aluminum sheets, and polish the two metal sheets until polished stripes with the same direction appear; Stack the polished iron sheets and aluminum sheets alternately and keep the polished stripes in the same direction to obtain a laminated blank; (2) Room temperature pre-bonding: The laminated blank is rolled to obtain an intermediate material preliminarily bonded at room temperature; (3) High-temperature diffusion bonding: The intermediate material is heat-insulated at a certain temperature, immediately taken out after the treatment and hot-rolled to obtain a lightweight and high-strength Fe-Al composite plate. Through rolling, the surface of the sheet metal is broken and mechanically meshed, and diffusion reaction occurs during heat preservation to generate an intermetallic compound layer, and pores are eliminated to make the interface better bonded, so that the finished product has good tensile properties.

To provide a heat exchanger which can detect a joined state in the same flow passage that cannot be detected in a lamination type heat exchanger.SOLUTION: A heat exchanger is formed by alternately laminating a plurality of first metal plates and a plurality of second metal plates joined by diffusion junction. At the plurality of first metal plates, a first partition wall and a plurality of first protrusions are provided. At the plurality of second metal plates, a second partition wall and a plurality of second protrusions are provided. Any one of the plurality of first protrusions and any one of the plurality of second protrusions overlap alternately in the lamination direction. At any one of the plurality of first protrusions and at any one of the plurality of second protrusions, a first through-hole is formed at the first protrusion, and a second through-hole is formed at the second protrusion. The first through-hole is formed at the first partition wall at a portion where the first protrusion is provided, and the second through-hole is formed at the second partition wall at a portion where the second protrusion is provided. A first passage in which the first through-hole and the second through-hole are connected in the lamination direction is formed.SELECTED DRAWING: Figure 1

The application provides a hollow part superplastic forming method with thickness steps, comprising the following steps: diffusion bonding multiple plates to form a superplastic forming blank, the superplastic forming blank has a hollow area for filling high-pressure gas and a solid area for realizing diffusion bonding, and the hollow area forms N thickness steps; and designing N superplastic forming molds corresponding to the N thickness steps according to a forming numerical model of the hollow part. The application designs and processes multiple superplastic forming molds on the basis of the forming numerical model of the hollow part, sequentially superplastic forms each thickness step from thick to thin through the multiple superplastic forming molds, makes each thickness step sequentially thin from thick to thin, reduces the thickness gradient difference between each thickness step, makes the thickness distribution of the finally superplastically formed hollow part more uniform, and improves the deformation coordination of different areas, and solves the problem of severe thinning of the thinner area generated by one-time superplastic forming.

Methods of joining dissimilar metal, non-cylindrical golf club components, and particularly golf club bodies and faces, using one or more solid state processes are disclosed herein. One method includes the steps of preparing a first non-cylindrical golf club component made of a first metal material, preparing a second non-cylindrical golf club component made of a second metal material that is different from the first metal material, and affixing the first non-cylindrical golf club component to the second non-cylindrical golf club component along a plane using a solid state joining process. Another method includes the steps of providing a golf club body with a first planar joining surface, providing a golf club face component with a second planar joining surface, and affixing the first planar joining surface to the second planar joining surface via linear friction welding, rotational friction welding, diffusion bonding, or ultrasonic welding.

A facing diffusion welding structure blade journal boring and milling tooling, belonging to the technical field of aero-engine blade machining, includes a base for supporting the upper structure, and a first pressing plate positioning assembly and a second pressing plate positioning assembly installed at both ends of the upper surface of the base. At the upper surface of the base at the front ends of the first pressing plate positioning assembly and the second pressing plate positioning assembly, a second positioning block and a third positioning block for determining the axial direction of the blade are respectively installed, so as to realize the conformal positioning in the axial direction of the blade. By using the journal boring and milling tooling, boring and milling are combined on the same device, which can meet the requirement of no interference during the two machining processes of boring and milling, improve the clamping stability of the blade, and the consistency of the position tolerance of the journal is better; at the same time, the blade does not vibrate during the machining process, avoiding the problem of unstable machining dimensions caused by the vibration of the blade, thereby improving the machining quality of the blade.

The invention discloses a large-size bonding method for multi-stage sequential TiAl single crystals, and belongs to the technical field of metal alloy welding. The invention provides a parallel lamella bonding method of a large-size multi-stage sequential TiAl single crystal. The method comprises the following steps: the surface roughness of a sample reaches below 200nm; and carrying out parallel lamellar orientation bonding by adjusting temperature, pressure and heat preservation time under a high vacuum degree. The invention also provides an atomic-scale diffusion bonding method of the large-size multi-stage sequential TiAl single crystal, which comprises the following steps of: after the parallel lamellae are subjected to oriented bonding, repeatedly placing under a high vacuum degree, and carrying out vertical lamellar oriented bonding by adjusting the temperature, the pressure and the heat preservation time, so as to obtain the large-size multi-stage sequential TiAl single crystal after the parallel lamellae and the vertical lamellae are bonded. According to the method, atomic-scale diffusion bonding of the large-size TiAl single crystal is achieved, and the size requirement of practical application is met. The operation method is simple, energy-saving and environment-friendly, and can be used for bonding in batches.

The application discloses a kind of profile pre-dispersion superplastic forming / diffusion connection method, belong to superplastic forming field.The present application solves the uneven wall thickness problem caused by excessive deformation of core plate when forming ultra-thin hollow multilayer structure by existing superplastic forming / diffusion connection method.The present application makes the core plate first undergo a large plastic deformation by the method of pre-expansion, releases the stress concentration in the material, then makes the protruding part undergo plastic deformation by positive expansion, because the core plate has undergone plastic deformation in the reverse expansion stage, the stress is more evenly distributed in the positive expansion stage, thereby avoiding the phenomenon of excessive deformation and thinning in local area, especially in high strain parts such as fillet, greatly improving the uniformity of wall thickness.The method provided by the present application includes the following steps:(1) core plate preforming and welding isolation rib;(2) panel forming;(3) core plate and panel combination;(4) core plate reverse expansion;(5) core plate superplastic forming.

The invention discloses a method for welding zirconium alloy through combination of thermal hydrogen treatment and vacuum thermal compression, and belongs to the technical field of materials and welding. The problem that the zirconium alloy is prone to plastic attenuation in the fusion welding and high-temperature diffusion bonding processes is solved. According to the method, the to-be-welded zirconium alloy element is firstly subjected to thermal hydrogen treatment, hydrogen can reduce the phase transition temperature of the zirconium alloy, then the zirconium alloy is subjected to vacuum hot pressing in the diffusion bonding process, large-scale recrystallization and recrystallization occur in the zirconium alloy under the combined action of temperature and pressure, and crystal grains are refined to a certain extent. And meanwhile, the zirconium alloy subjected to thermal hydrogen treatment can release a large amount of hydrogen, and hydrogen embrittlement of the zirconium alloy is avoided. The vacuum hot pressing process also enables the zirconium alloy to generate work hardening so as to further improve the strength of the zirconium alloy. The welding rate of a zirconium alloy element connector obtained through welding reaches 100%, the shear strength of the connector can reach 450 MPa or above, and the shear elongation reaches 29%.

This invention relates to a method for preparing a high-wear-resistant metal-based composite material. This method significantly improves the wear resistance of the material by combining nano-reinforcing particles, surface modification technology, and self-healing capabilities. Aluminum alloy or titanium alloy is selected as the matrix, and nano-sized silicon carbide or alumina particles are used as reinforcing materials. The reinforcing materials are uniformly dispersed using processes such as stir casting, forging, diffusion bonding, infiltration, or powder metallurgy. The composite material structure is then precisely formed using 3D printing technology. The surface of the composite material is treated with a nano-coating or plasma treatment to enhance its wear resistance and corrosion resistance. Furthermore, by embedding microcapsules containing a repair agent into the material, automatic repair of worn areas is achieved, improving the material's reliability and service life. This composite material is particularly suitable for mechanical engineering and automotive manufacturing, especially in the manufacture of automotive brakes under high-wear environments, demonstrating excellent performance and broad application prospects.

To provide a Cu-based powder allowed to prepare a Cu-based material that Fe in the Fe-based material is not to excessively diffuse toward the Cu-based material if the Cu-based and Fe-based materials are both used for diffusion-bonding or infiltration and is excellent in diffuseness to the Fe-based material, and moreover to suppress the hindrance to diffusion-bonding, infiltration or sintering by a SiO2 oxide film because of a reduced solid-solubility limit of Si to a Cu phase and it is less apt to form a SiO2 oxide film over a powder surface.SOLUTION: A Cu-based powder comprises an Fe content of 1.5 mass% or higher and 5.0 mass% or lower, a Mn content of 0.3 mass% or higher and 6.0 mass% or lower, a Si content of 0.25 mass% or lower, an O content of 0.25 mass% or higher and 0.55 mass% or lower, and the remainder of Cu and inevitable impurities.SELECTED DRAWING: None

The disclosed method of diffusion bonding of a lead zirconate titanate piezoelectric crystal to a metal wear plate, for the fabrication of an ultrasonic transducer operable at high temperatures and able to withstand repeated thermal cycling, comprises depositing noble metal coatings on both bonding surfaces, bringing the surfaces into contact, and heating under pressure at a temperature ranging from 270 to 400° C.

The invention discloses a diffusion welding method for an electrostatic chuck base and an insulating layer. The diffusion welding method comprises the following steps that (1) the base and the insulating layer are pretreated; (2) the three-layer composite brazing filler metal is subjected to laser cutting according to the size of a to-be-welded area; the cut three-layer composite brazing filler metal is subjected to ultrasonic cleaning, drying and vacuum sealing storage; (3) the base, the three layers of composite brazing filler metal and the insulating layer are stacked and assembled in sequence; (4) the assembly part is put into a vacuum diffusion welding furnace, vacuumizing is conducted till the pressure is smaller than or equal to 2 * 10 <-3 > Pa, the temperature is increased to 500-600 DEG C in a segmented mode, meanwhile, the axial pressure of 2-20 MPa is applied, and after pressure maintaining, the temperature is slowly reduced to the room temperature; and (5) carrying out nondestructive testing on the welding interface by adopting an X-CT and ultrasonic phased array detection system. The welding temperature can be reduced, so that the residual stress of a welding bonding interface can be reduced, the cracking risk in the using process of the electrostatic chuck is reduced, and the service life of the electrostatic chuck is prolonged; meanwhile, it is ensured that the bonding interface has high thermal conductivity, and the temperature uniformity of the wafer can be improved.

A sputtering target assembly comprises a tungsten containing sputtering target, a titanium containing backing plate attached to the tungsten containing sputtering target and an interlayer positioned between and diffusion bonding the tungsten containing sputtering target and the titanium containing backing plate. The interlayer includes a nickel layer immediately adjacent to the tungsten containing sputtering target and a copper layer immediately adjacent to the nickel layer.