173 results about "Ceramic metal" patented technology

The invention discloses a method for metallizing ceramic by using whisker pinning, and relates to a method for metallizing ceramic. The technical problems that an existing ceramic metallization process is complex, the application range is small, and cost is high are solved. According to the method, boric acid is adopted to heat the surface of the ceramic containing the Al element, the aluminum borate crystal whiskers in the micro-nano size level can grow, and the crystal whiskers are high in high-temperature strength; then the ceramic with the whisker structure and the metal are subjected to hot pressing at a high temperature, the metal material is softened at a high temperature along with temperature rise, the whiskers can be pressed into the metal, a microcosmic pinning structure is formed, connection between the ceramic and the metal is achieved, and metallized ceramic is obtained; and then in the cooling process, the metal is cooled and shrunk, stress is formed on the crystal whiskers, and the binding force of the ceramic and the metal is improved. According to the method, ceramic metallization is achieved through whisker pinning, operation is simple and effective, and the obtained metallization layer is excellent in performance, good in mechanical stability and wide in application range and has good application prospects.

The invention relates to the field of particle accelerators, in particular to an ultrahigh and extremely high vacuum acquisition system and method. The vacuum obtaining system comprises a vacuum obtaining device and a vacuum temperature control device, the vacuum obtaining device comprises a ceramic vacuum chamber, an interlayer vacuum chamber, a main pump chamber, a first vacuum pumping assembly and a second vacuum pumping assembly, the main vacuum chamber is formed in the ceramic vacuum chamber, and the ceramic vacuum chamber is arranged in the interlayer vacuum chamber; and an interlayer space is formed between the ceramic vacuum chamber and the interlayer vacuum chamber. The ceramic vacuum chamber is arranged in the interlayer vacuum chamber, the interlayer space is formed between the ceramic vacuum chamber and the interlayer vacuum chamber, and the interlayer vacuum chamber is heated through the heating element, so that the ceramic vacuum chamber is uniformly heated in a non-contact heat radiation uniform heating mode; the problem of thermal stress concentration caused by direct conduction heating of the ceramic vacuum chamber is thoroughly eliminated, leakage or fracture of the ceramic-metal joint caused by thermal stress is avoided, and the structural integrity of a heterogeneous material connecting area is ensured.

The invention relates to a method for manufacturing the surface of a timepiece component, in particular an external timepiece component, characterized in that it comprises the following steps: obtaining a timepiece component blank forming the core of the timepiece component; -depositing on said core a surface coating made of a ceramic-metal composite to form a hard surface of the timepiece component, said hard surface having a hardness greater than or equal to 500 HV, or even greater than or equal to 600 HV, or even greater than or equal to 750 HV, or even greater than or equal to 900 HV.

The utility model discloses a ceramic metallization tensile strength detection device which comprises a workbench, a power box is fixedly arranged at one end of the top surface of the workbench, a fixed plate is fixedly connected with one end, far away from the power box, of the top surface of the workbench, and a movable plate is arranged between the power box and the fixed plate on the top surface of the workbench in a sliding mode. Clamp heads are fixedly connected to the opposite side faces of the fixed plate and the movable plate, wedge-shaped grooves are formed in the opposite side faces of the two clamp heads respectively, wedge-shaped clamping blocks are arranged on the inclined side walls in the wedge-shaped grooves in a relatively sliding mode, and the clamping faces of the two clamping blocks are arranged in parallel. According to the tensile strength detection device for ceramic metallization, the clamping surfaces of the clamping blocks are kept parallel in the moving process, so that the clamping surfaces are in uniform contact with the surface of a ceramic substrate, stress concentration cannot be generated, the ceramic substrate can be firmly clamped, falling off during tensile strength detection can be prevented, and meanwhile, stripping or falling off of a metal layer can be prevented.

The invention relates to the technical field of material sintering equipment, and discloses an intelligent temperature and pressure control sintering furnace with vacuum and positive pressure sintering functions, which comprises a shell, a control mechanism is arranged outside the shell and is used for controlling the whole device in real time, and a vacuumizing mechanism is arranged on one side in the shell and is used for vacuumizing the shell. The vacuumizing mechanism further comprises an upper heating assembly, a lower heating assembly, a pressing and sealing assembly and a pressure weighing assembly, the upper heating assembly is used for upper heating treatment, the lower heating assembly is used for lower heating treatment, the pressing and sealing assembly is used for pressing and sealing treatment, and the pressure weighing assembly is used for conducting weighing detection on pressure. A pressure detection mechanism is arranged on the other side in the machine shell. Through the collaborative design of the composite vacuum system and the pressure control module and through the sintering process requirements of covering multiple types of materials such as precision ceramics and metal composite materials, the process compatibility and stability are remarkably improved.

The application relates to a method for preparing a porous structure Al2O3 / Al ceramic metal coating on the surface of an aluminum-based composite material, and belongs to the technical field of surface treatment of aluminum-based composite materials. The application aims to solve the problems of the prior art, such as complicated preparation of ceramic-metal composite materials, uncontrollability, high cost, difficulty in balancing the strength and toughness of the composite material, and insufficient regulation of the thermal conductivity. The method comprises the following steps: I, pretreating the surface of the aluminum-based composite material; II, preparing a porous micro-arc oxidation coating; and III, preparing an Al2O3 / Al ceramic coating with a complete structure. The multilayer structure composite material prepared by the application has more excellent mechanical properties (high resistance to friction and wear, high thermal shock resistance, adjustable thermal expansion coefficient, high fracture toughness) and high thermal conductivity (>=100 W / mK), and has important significance for the upgrading of future packaging substrate materials and the development of composite materials for harsh deep-sea, deep-space and deep-earth environments.

The invention relates to the technical field of material surface engineering and extreme working condition tribology, in particular to a wide-temperature-range composite lubricating component based on multi-scale design and interface self-adaption and a preparation method of the wide-temperature-range composite lubricating component based on multi-scale design and interface self-adaption. The composite lubricating structure comprises, from inside to outside, a metal bonding layer; the composition of the diffusion barrier layer is continuously and gradually changed from the alloy composition matched with the metal bonding layer to the ceramic composition; the self-lubricating functional layer comprises a ceramic metal composite matrix and a plurality of lubricant capsules dispersed in the ceramic metal composite matrix; the lubricant capsule comprises a ceramic shell layer and at least two lubricating phases with different temperature activation characteristics wrapped by the ceramic shell layer. According to the invention, continuous and effective lubrication in a wide temperature range is realized, the friction coefficient can be stabilized below 0.3, and the problems of reduction of the binding force between a coating and a matrix and early failure are solved.

The application belongs to the field of welding, and discloses a preparation method of ceramic / metal composite material. The ceramic is quickly metallized by laser scanning marking on the ceramic surface, and the metallized ceramic and copper are sintered by hot isostatic pressing to prepare the ceramic / metal composite material. The problems of poor wettability of the ceramic and the metal and high preparation cost are solved, the cost is reduced by laser metal foil pretreatment on the ceramic surface, the processing time is short, the process temperature is low, and the operation is safer. In the preferred embodiment of the application, there is a transition layer with a thickness of about 6 microns, and the existence of the transition layer can well increase the bonding force of the composite material, and the peeling strength can reach 9.94 N / mm.

This invention relates to a palladium-nickel-based brazing filler metal and a brazing method for high-temperature brazing of ceramic materials. The composition and content (mass percentage) of the palladium-nickel-based brazing filler metal are as follows: Nb: 8.0%–15.0%; Ti: 10.0%–18.0%; Zr: 5.0%–12.0%; Hf: 2.0%–6.0%; Ni: 20.0%–30.0%; Pd: balance, with a Pd to Ni ratio of 3:2. The method includes preparing raw materials according to the filler metal composition; then melting the raw materials into alloy ingots using an electric arc melting method under argon protection; preparing strip-shaped or powdered filler metal; placing the prepared filler metal between ceramic / ceramic or ceramic / metal materials and then brazing it at high temperature in a vacuum furnace. This invention can be used for high-temperature brazing of Si3N4 ceramics, SiC ceramics and their composites, and SiBCN system ceramics and their composites, with a joint temperature resistance of not less than 900℃.

The application relates to a kind of anti-14.5mm armor-piercing bullet function gradient armor structures, and the application relates to a kind of function gradient armor structures.The application is to solve the problems that the traditional ceramic / metal or ceramic / fiber composite armor structure has large area density and excessive thickness, and the anti-bullet performance is difficult to further improve.The armor structure includes a ceramic panel, a gradient B4C / Al composite material and a packaging material, and the overall structure presents a 100-50% gradient change in ceramic content from the panel to the back plate.The thickness of the ceramic panel in the armor structure is 14-18mm;The gradient B4C / Al is a multi-layer structure, and the overall thickness is 12-15mm;The packaging material includes a crack arrest layer, an adhesive and a fiber layer.The application is used in the field of armor protection.

This invention discloses a conductive paste for metallization of electronic ceramics, belonging to the field of electronic materials technology. The conductive paste for metallization of electronic ceramics of this invention includes copper alloy powder, glass powder, and an organic carrier. By controlling the ratio of copper, aluminum, and zinc in the copper alloy, the thermal expansion coefficient of the alloy is adjusted, making it compatible with electronic ceramic substrates such as alumina ceramics and zinc oxide varistors, achieving metallization through sintering under air conditions. The addition of tin improves the solderability of the metallized layer, meeting the process requirements of electronic components. The glass powder added in this invention has a low initial melting temperature, high bonding strength with the copper alloy, and strong adhesion to the ceramic substrate; combined with a specific ratio of organic carrier, it effectively improves the conductivity of the metallized layer after sintering.

Semiconductor components and systems having substrate contact surfaces with reduced hardness are provided. Systems and components include a ceramic, metallic, or non-metallic component for contacting a substrate. Systems and components include a layer of coating material on at least a portion of a substrate contact surface of the component. Systems and components include where the component for contacting a substrate includes a component Vickers hardness value, and the layer of coating material exhibits a coating Vickers hardness value. Systems and components include where the coating Vickers hardness value is more than or about 10% lower than the component Vickers hardness value.

The utility model provides a kind of micro pattern repair resistance device of ceramic metal film resistor, belong to micro-nano manufacturing technology field, including numerical control machine tool, support plate fixedly installed on the outer surface of numerical control machine tool, and ultraviolet laser is arranged to the outside of support plate;Self-locking mechanism, including the fixed frame fixedly connected to the outer surface of support plate, the connecting shaft fixedly installed in the inner surface of the fixed frame by bearing sleeve, the gear fixedly set in the outer end surface of the connecting shaft, the toothed plate engaged with the outer surface of the gear.The utility model can not only use the automatic gravity of ultraviolet laser to quickly install it by the cooperation between each component in self-locking mechanism, but also can automatically lock it after ultraviolet laser installation by locking assembly, so that ultraviolet laser can complete installation in a short time, and ensure that the laser after each replacement can be firmly locked.

The invention relates to the technical field of ceramic metal powder production, and provides a ceramic metal powder injection-compression molding, blanking and demoulding all-in-one machine which comprises a tray feeding device, a turnover device and a discharging device. The mold discharging device is used for feeding a mold into the overturning device, and the mold is internally provided with a product formed through injection molding of ceramic metal powder. The overturning device is used for locking the mold, arranging the tray above the mold, pressing the tray at a forming notch of the mold, enabling the tray and the mold to overturn at the same time, separating the mold from the tray up and down, enabling the product to fall off from the mold to the tray, overturning the mold again after the tray is pushed out, and unlocking the mold; the pushing device is used for pushing the tray to the discharging device from the overturning device, the tray bears the product, and then the mold is pushed to the mold returning device from the overturning device. The automatic turnover demolding machine has the advantages that the turnover device automatically receives the mold and the tray for turnover demolding, and the tray and the mold are automatically and separately conveyed out under the cooperation of the pushing device and the turnover device.

The application relates to a two-step brazing method for improving the joint strength of M42 steel and PCBN ceramic by using solid solution brazing, and belongs to the field of ceramic-metal brazing. The application aims to solve the problems of the existing M42 steel and PCBN ceramic brazing difficulty and low mechanical property. The method comprises the following steps: 1, ball milling mixing; 2, bonding the mixed powder after ball milling on the surface of the M42 steel; 3, heating to the mixed powder on the surface of the M42 steel to fully melt; 4, polishing, cleaning and drying; 5, placing Ti foil between the PCBN ceramic and the M42 steel which is pretreated and covered with a molten layer to obtain a to-be-welded piece; and 6, keeping the temperature at the connecting temperature. The application is used for the two-step brazing for improving the joint strength of M42 steel and PCBN ceramic by using solid solution brazing.

The application belongs to the technical field of ceramic matrix composite, and discloses a hypersonic aircraft hot end component and a preparation method and application thereof, and the method comprises the following steps: (1) printing a green body of the hypersonic aircraft hot end component to be prepared by taking ceramic-metal silicon-binder composite powder as raw materials; wherein the raw materials of the ceramic-metal silicon-binder composite powder comprise ceramic powder, metal silicon and organic binder; (2) after the green body is solidified, pressureless sintering is first carried out under the condition of nitrogen, then carbon precursor is infiltrated and reaction sintering is carried out, and then the hypersonic aircraft hot end component is obtained. By means of nitriding, uniformly distributed silicon nitride bonding phases and pyrolytic carbon are generated in the body, reaction sintering silicon infiltration converts the pyrolytic carbon into silicon carbide, the obtained material contains in-situ nitrided silicon nitride and secondary silicon carbide (beta-SiC) generated by reaction sintering silicon infiltration as bonding phases, and has more excellent mechanical properties.

This invention belongs to the field of high-content ceramic / metal composite material preparation technology, specifically relating to a high-fatigue-strength B4C / Al composite material and its preparation method. This invention employs chemical vapor deposition to generate CNTs in situ on the surface of micro / nano-scale B4C particles. These CNTs are then thoroughly mixed with aluminum alloy powder, and a billet is prepared using SPS plasma discharge sintering equipment. After grinding and polishing, the billet is processed using a high-frequency current rolling test bench to obtain a high-fatigue-strength B4C / Al composite material. This invention aims to improve the interfacial bonding quality of ceramic / metal composite materials and inhibit harmful reaction products through the modification effect of CNTs; the addition of high-frequency current-assisted rolling enhances the fatigue resistance of the composite material, resulting in a B4C / Al composite material with excellent comprehensive performance.

The invention discloses a high-strength ceramic metallization method and application thereof. The method comprises the following steps that metallized powder is provided, and the metallized powder is obtained by mixing and ball-milling the following powdery components including, by mass, 70%-75% of refractory metal, 6%-12% of Al2O3, 1%-5% of Mn, 6%-22% of SiO2 and 1%-7% of CaO; uniformly mixing the metallized powder with a binder to obtain metallized slurry; and printing the metalized slurry on the surface of an aluminum oxide ceramic substrate, drying, and sintering in a hydrogen furnace to form a metal layer with the thickness of 15-50 microns on the surface of the substrate. According to the technical scheme, the problems that an aluminum oxide ceramic energy transmission window is prone to sparking, breakdown and the like and the problems that a high-purity fine-grain aluminum oxide ceramic metalized layer is low in sealing strength, poor in compactness and the like are solved, and the obtained metalized aluminum oxide ceramic can be well applied to preparation of a high-power energy transmission window.

A composite grinding ball has a core-shell structure. The shell has a ceramic reinforcement including a three-dimensionally interconnected network of periodically alternating ceramic metal composite granules with interstices having an average size within the millimetric range. The ceramic metal composite granules have at least 40 vol % of ceramic particles cemented in a binder metal matrix, the ceramic particles having average sizes within the micrometric range. The three-dimensionally interconnected network is embedded in a ferrous alloy cast metal matrix that fills the interstices between the interconnected ceramic metal composite granules. The embedded ceramic metal composite granules have a volume fraction of porosity of less than 5 vol %. The shell has a volume content of ceramic metal composite granules of at least 35 vol %, and the ceramic reinforcement covers at least 85% of the total surface of the grinding ball.

The invention belongs to the technical field of ceramic metal composite materials, and particularly relates to a multiphase ceramic composite plate and a preparation method thereof, and a metal-based ceramic composite lining plate for a ball mill and a preparation method thereof. The composite material comprises the following components in parts by weight: 70-90 parts of zirconium oxide, 5-10 parts of silicon carbide, 5-10 parts of aluminum oxide, 2-6 parts of titanium dioxide, 2-5 parts of tungsten carbide, 2-4 parts of scandium oxide, 2-4 parts of cobalt oxide, 1-3 parts of potassium tantalate, 1-3 parts of potassium titanate, 1-2 parts of bismuth trioxide and 1-2 parts of erbium oxide. A compact ceramic plate is obtained through mixing, wet grinding, drying, pressing and high-temperature sintering, and the special-shaped ceramic sheet is formed through further crushing and screening. The special-shaped sheet is laid in a mold and filled with high-chromium cast iron powder, and the integrated metal-based ceramic composite lining plate with a stable structure is formed through compaction and high-temperature sintering. The prepared lining plate has the high hardness of ceramic and the toughness of metal, and is suitable for high-abrasion equipment such as a ball mill.

The invention discloses a plating material for surface metallization of a ceramic material, the ceramic material and a preparation method of the ceramic material. The plating material for metallizing the surface of the ceramic material comprises a metal alloy and a mixed salt in a weight ratio of 1: (1-10), wherein the metal alloy comprises, by weight, 10%-99% of active metal elements, 0%-85% of iron elements and 1%-5% of other elements, and the active metal elements comprise one or more of transition metal of titanium, molybdenum, vanadium, niobium, tungsten or rare earth neodymium; the mixed salt comprises two or three of alkali metal salt, alkaline earth metal salt and villiaumite; the plating material for metallization of the surface of the ceramic material is used for forming a metal layer on the surface of ceramic by utilizing ionization deposition of high-temperature molten salt on metal alloy. The plating material for ceramic material surface metallization can be used for plating micron-scale transition metal layers such as titanium, molybdenum, vanadium, niobium, tungsten, rare earth neodymium and the like on the ceramic surface, the aim of low-cost metallization of the ceramic surface is achieved, and the wettability and interface bonding strength of ceramic metal are improved.

A computer-controlled machine tool (1) for the production of small workpieces, particularly in the dental field, preferably from ceramic materials, metals, plastics, or waxes, is described. The machine tool is designed with a tool spindle (2) for holding various tools (3), with a tool motor (4) for driving the tool spindle (2), and with a workpiece holding device (5) for receiving and holding a workpiece (6) to be machined, wherein the workpiece holding device (5) can be positioned relative to the rotating tool (3) in or about three to five or more machining axes, with a frame element on which the tool motor (4) and the workpiece holding device (5) are mounted by means of linear guides, characterized in that the frame element is designed as a plane-parallel base plate (8) and two linear guides are arranged on the base plate (8) at an intersecting angle.wherein a tool spindle axis (2A) of the tool motor (4) is arranged at a wider angle to the other linear axes of the linear guides such that, by coordinated movements of the three linear axes, all points in space, at least within the intended workpiece (6), can be reached with the tool clamped in the tool spindle (2).

The utility model discloses a ceramic metal composite grinding abrasive belt which comprises a grinding machine body and two rotating wheels, the grinding abrasive belt is arranged between the rotating wheels, the grinding abrasive belt comprises a grinding layer, a first glass fiber reinforcing layer, a base layer, a second glass fiber reinforcing layer and a contact layer, and a plurality of sets of grinding protruding blocks are evenly arranged on one side of the grinding layer. A plurality of deformation grooves are evenly formed in the two sides of the outer edge of the grinding protruding block, a connecting block is arranged in the middle of the bottom of the grinding protruding block, a plurality of deformation pieces are arranged in the contact layer, each deformation piece comprises a top block and two deformation plates, and a deformation column is arranged between the middle of each top block and the contact layer. Through cooperative use of the grinding protruding blocks, the deformation pieces and other components, grinding force between the grinding layer and the ceramic metal surface can be effectively enhanced, the grinding effect is guaranteed, the deformation pieces can enhance the tensioning force of the contact layer, the contact strength between the contact layer and the rotating wheel is guaranteed, and the service life of the rotating wheel is prolonged. And therefore, the possibility of slipping during grinding is reduced.

The utility model discloses a ceramic copper-clad plate, which comprises a ceramic metal substrate, a copper plate and a bonding layer between the ceramic metal substrate and the copper plate, the bonding layer comprises a tin coating and a silver coating, and the tin coating is welded with the silver coating; and the combination surface between the tin coating and the silver coating comprises a tin-silver embedded structure with the height of more than 0.5 mu m. According to the ceramic copper-clad plate disclosed by the utility model, the tin-silver embedded structure is arranged on the combined surface between the tin-plated layer and the silver-plated layer, so that the combined area between the tin-plated layer and the silver-plated layer is increased, and the combined strength between the tin-plated layer and the silver-plated layer is high.

The invention relates to a ceramic-metal brazed joint with a nanocrystalline interface reaction layer and a preparation method and application of the ceramic-metal brazed joint, and belongs to the technical field of heterogeneous material connection. The invention discloses a ceramic-metal brazed joint with a nanocrystalline interface reaction layer. The ceramic-metal brazed joint comprises a ceramic matrix, a metal matrix, an active brazing filler metal layer and a nanocrystalline structure layer, wherein the active brazing filler metal layer is used for connecting the ceramic matrix and the metal matrix, and the nanocrystalline structure layer grows in situ between the active brazing filler metal layer and the ceramic matrix. According to the nanocrystalline reaction layer disclosed by the invention, the interface bonding strength and the thermal shock resistance of the joint are remarkably enhanced through a fine grain strengthening and toughening mechanism in combination with the structural isotropy of the nanocrystalline reaction layer, and the excellent sealing reliability of the joint in a severe environment is ensured; the method is suitable for aerospace thermal protection, high-power electronic device packaging and preparation of high-temperature and high-pressure sensor sealing components.

The invention relates to the technical field of ceramic / metal heterogeneous material connection, in particular to a method for low-temperature brazing of a porous SiC / TC4 connecting piece based on ultrasonic-assisted pre-dip plating. In order to solve the problems that in the prior art, a porous SiC ceramic structure is prone to damage, and the mechanical property of a connecting piece is low, the method comprises the two steps that firstly, low-temperature brazing filler metal is pre-dip-plated on the surface of porous SiC and TC4 alloy under ultrasonic assistance, the brazing filler metal is promoted to permeate into ceramic pores through the acoustic capillary effect, a bonding layer is formed, the ultrasonic effect is indirectly applied, and the bonding layer is formed; the ceramic matrix is prevented from being damaged; and then, the pre-dip-plated component is subjected to brazing connection at low temperature, and a compact and reliable connector is formed. According to the method, high-strength and low-damage connection of the porous ceramic and the titanium alloy at the low temperature is achieved, the process is simple and convenient, and the method is suitable for preparing complex structural parts in the fields of aerospace, chemical filtration and the like.

The invention discloses a ceramic metal-clad substrate, which comprises a first metal cladding layer and a second metal cladding layer, wherein the first metal cladding layer is positioned on the reverse side of an intermediate heat-conducting ceramic layer; and at least one pyrolytic graphite layer is compounded in the first metal coating. The front surface of the first metal sub-layer is welded on the back surface of the middle heat-conducting ceramic layer; the front surface of the pyrolytic graphite layer is welded on the back surface of the first metal sub-layer. And the front surface of the second metal sub-layer is welded on the back surface of the pyrolytic graphite layer and the back surface of the first metal sub-layer outside the pyrolytic graphite layer. The pyrolytic graphite layer has first plane thermal conductivity and second longitudinal thermal conductivity, the first plane thermal conductivity is larger than the second longitudinal thermal conductivity, the thickness of the pyrolytic graphite layer serves as a longitudinal thermal resistance adjusting parameter of the pyrolytic graphite layer, and the heat dissipation capacity of the first metal coating is improved through the first plane thermal conductivity and the thickness of the pyrolytic graphite layer. The invention also discloses a power module. The heat dissipation capacity of the substrate can be improved, a good technological structure can be kept, the reliability of a product is improved, and the service life of the product is prolonged.

The invention provides a ceramic / metal multilayer brazing structure and a preparation method and application thereof, and relates to the technical field of electronic packaging. The ceramic / metal multilayer brazing structure comprises a ceramic substrate, a titanium layer, a diffusion barrier layer and a nano bonding layer from bottom to top, wherein the thickness of the diffusion barrier layer is 10-40nm. According to the ceramic / metal multi-layer brazing structure, the diffusion barrier layer is additionally arranged between the titanium layer and the nano bonding layer, Ti atoms can be effectively prevented from diffusing upwards to the Cu or Ag layer, generation of a brittle Ti-Cu reaction layer is inhibited, disintegration of the multi-layer structure and interface embrittlement can be effectively prevented, and the service life of the ceramic / metal multi-layer brazing structure is prolonged. Therefore, the integrity of the amorphous Ag / Cu multilayer structure is kept, the long-term reliability of the joint is improved, the interface structure of the joint is more uniform, the stress concentration is reduced, and the reliability under long-term thermal cycle and mechanical shock is remarkably improved.

This invention discloses an article comprising a substrate having a first portion comprising at least one of a metal or a ceramic metal oxide. A composite foam is bonded to the metal or ceramic metal oxide. The composite foam comprises: at least one polymer capable of being prepared by ring-opening metathesis polymerization; at least one catalyst for ring-opening metathesis polymerization; at least one bifunctional coupling agent represented by Z-X-Z. Each Z independently represents a group that chemically reacts with at least one of the chemically bonded surface hydroxyl groups to form at least one covalent bond. Each X independently represents a divalent organic linker group with a number average molecular weight of 500 g / mol to 10000 g / mol. And at least one of hollow glass microspheres or expanded polymer microspheres. This invention also discloses a method for preparing the article.

The invention discloses a ceramic metallization paste, an activating agent, a preparation method and application, and belongs to the technical field of application of ceramic metallization materials.alpha-Al2O3, CaCO3, BaSO4, ZrO4, TiO2, Suzhou clay, talcum powder, water, a dispersing agent and aluminum oxide ceramic balls are mixed and subjected to ball milling, and mixed slurry is obtained; adding a binder, a lubricant and a defoaming agent, mixing and grinding; after spray granulation treatment, pressing into a ceramic blank; and carrying out high-temperature sintering, secondary ball milling and drying to obtain the activating agent for the ceramic metallization paste. The preparation method comprises the following steps: mixing molybdenum powder, manganese powder and an activating agent for the ceramic metallization paste, performing dry grinding to obtain a mixed dry material, adding a binder and grinding balls, and performing ball milling and sieving to obtain the ceramic metallization paste. By adding the activating agent, the uniform and fine ceramic metallization paste is prepared, the binding force of a metallization layer and a ceramic matrix material is improved, the sealing strength reaches 300 MPa or above, the air tightness meets the requirements of a vacuum arc extinguish chamber, and the ceramic metallization paste is suitable for industrial application.