601 results about "Cermet" patented technology

The invention discloses a rare earth metal ceramic and a preparation method thereof, and belongs to the technical field of metal ceramic preparation, the rare earth metal ceramic comprises, by mass, 45-65% of a ceramic phase, 30-50% of a metal binding phase and 3-8% of a rare earth additive, the ceramic phase is composed of one of TiC and WC and one of Al2O3 and ZrO2, the metal binding phase is composed of a Ni-Co alloy and Mo or Cr, and the rare earth additive is composed of one of Al2O3 and ZrO2. The rare earth additive is composed of mixed rare earth oxide and nano rare earth fluoride. The invention further provides a preparation method of the rare earth additive. Through the synergistic effect of oxide grain boundary purification and fluoride liquid phase sintering in a two-phase rare earth system, the problem that traditional single rare earth is difficult to add and disperse is solved, through staged hot pressing sintering, dual optimization of grain refinement and density improvement is achieved, and the high-temperature oxidation resistance and interface bonding strength of metal ceramic are enhanced.

The invention discloses a carbon nano tube reinforced tungsten carbide titanium metal ceramic material as well as a preparation method and application thereof, and belongs to the field of metal ceramic materials. According to the invention, a spark plasma coupling high-frequency induction sintering method is adopted, CNTs are uniformly dispersed in a material matrix through a method of dispersing CNTs through dry ball milling again, and the uniformly dispersed CNTs improve the discharge environment, reduce the sintering current and reduce the energy consumption under the spark plasma coupling high-frequency induction effect in the sintering process. The high-compactness, high-strength and high-wear-resistance (W, Ti) C-based metal ceramic material is prepared at the sintering temperature of 1350 DEG C by utilizing the ultrahigh conductive complementary effect of the (W, Ti) C metal ceramic material and the CNTs.

The invention belongs to the technical field of advanced metal ceramic composite materials, and particularly relates to high-toughness Ti (C, N)-based metal ceramic and a preparation method and application thereof. The high-toughness Ti (C, N)-based metal ceramic comprises the following components in percentage by weight: 50 to 70 percent of solid solution, 15 to 25 percent of metal binding phase, 0.1 to 0.5 percent of rare earth oxide or rare earth salt and 15 to 25 percent of carbide phase, the solid solution contains an amplitude-modulated decomposition structure. The solid solution hard phase with an amplitude modulation decomposition structure is reserved in the alloy containing a certain amount of metal binder, so that the metal ceramic material has higher fracture toughness, bending strength and high-temperature toughness compared with traditional Ti (C, N)-based metal ceramic under the condition that the hardness is kept unchanged.

A composite, comprising a binder, the binder comprising one or more of polymeric, metallic, or ceramic, or pyrolytic carbon binder and a nanostructured carbon having a cellular structure. The cellular structure comprises one or more cell walls having a structure formed by a template and one or more cavities. Each cavity is substantially enclosed by the one or more cell walls and substantially unimpregnated by a liquid or solid.

The invention discloses an anti-deformation industrial furnace water beam structure made of a gradient composite material and a preparation method. The water beam structure sequentially comprises a high-temperature-resistant gradient layer, a thermal stress buffer layer and a heat conduction base body layer from outside to inside. Wherein the high-temperature-resistant gradient layer is composed of a ceramic and / or metal ceramic material, and the components of the high-temperature-resistant gradient layer are in continuous or stepped transition from the outer surface to the inside in the thickness direction to form a metal material for resisting high-temperature oxidation and hot corrosion; the thermal stress buffer layer is composed of a metal-based composite material, the coefficient of thermal expansion (CTE) of the thermal stress buffer layer is between that of the high-temperature-resistant gradient layer and that of the heat-conducting matrix layer, and the thermal stress buffer layer is used for relieving And the heat-conducting matrix layer is made of a high-heat-conductivity metal material and is used for rapidly conducting out heat. Through collaborative optimization of materials and structures, the problems that a traditional water beam is concentrated in thermal stress and poor in thermal shock resistance are solved, and the water beam is suitable for long-term stable operation of a high-temperature industrial furnace.

The invention belongs to the technical field of metal ceramic, and particularly relates to a high-toughness metal ceramic particle and a preparation method thereof.The particle is characterized in that ceramic micro powder, surface modified ceramic powder and rare earth element carbonitride form a composite hard phase, and the composite hard phase is dispersed in a metal matrix composed of multiple metal elements; and synergistic regulation and control components are introduced to optimize interface bonding and tissue uniformity. Particles are subjected to a step-by-step heat treatment and isostatic pressing forming process, and a stable structure is formed by controlling the oxygen content and the sintering atmosphere. The obtained material has high bending strength, high fracture toughness and good thermal shock resistance, is suitable for the application field of wear resistance and crack resistance under extreme working conditions, and has tissue compactness and mechanical stability.

The invention belongs to the technical field of thermal power heating surface treatment, and provides a gradient functional composite coating applied to a boiler heating surface and a preparation method of the gradient functional composite coating in order to solve the technical problems that an existing protective coating of the boiler heating surface is prone to abrasion and oxidation and high in cost. Collaborative design is formed, and gradient matching of mechanical properties and environmental failure resistance is achieved. The low-melting-point glass powder is combined with the rare earth catalytic effect, low-temperature ceramization is achieved, and thermal damage to a matrix is avoided. After the metal ceramic transition layer is sprayed, high-frequency induction remelting treatment is carried out, meanwhile, laser cladding is carried out on the surface of the ceramic surface layer, a nanocrystalline-amorphous composite structure is formed, and the bonding strength of the coating is improved.

The invention provides a metal riveting structure for an alumina fiber battery shell and a preparation method. The problem of debonding caused by thermal expansion difference and insufficient interface bonding force in traditional metal and ceramic riveting is solved. The structure comprises a metal riveting piece, a connecting layer and a transition layer, a connecting rod of the metal riveting piece penetrates through an inner threaded hole of the connecting layer and goes deep into a stepped groove of the transition layer, and double connection of threaded screwing and stepped groove mechanical embedding is formed; a metal ceramic gradient layer is arranged between the transition layer and the connecting layer and is matched with a thermal expansion coefficient; the thickness of the diffusion layer is 10-100 microns, and the shear strength of the diffusion layer is larger than or equal to 50 MPa. The structure obviously increases the contact area, relieves the thermal stress, improves the interface strength and the long-term reliability in a wide temperature range, and is suitable for high-temperature battery shell connection.

The invention provides a high-speed laser cladding metal ceramic coating, a cast iron brake disc and a preparation method and application of the cast iron brake disc. The high-speed laser cladding metal ceramic coating comprises the following preparation raw materials in percentage by mass: 40%-60% of stainless steel, 10%-20% of SiC, 10%-30% of ZrO2, 5%-10% of Ti and 1%-2% of CeO2. According to the coating, the hardness, the wear resistance, the friction coefficient and the toughness of a cast iron matrix can be remarkably improved, and the braking requirement of a motor vehicle under the extreme working condition can be well met. The invention further provides the cast iron brake disc and a preparation method and application thereof.

The present invention discloses a method for preparing a high-entropy carbide-based cermet, comprising the following steps: step one, preparing the cermet according to the molar ratio of the carbide additive phase, placing the powder in a sand mill, and first ball milling the cermet; step two, ball milling the cermet for the second time, adding a metal binder, carbon black, paraffin wax, rubber, or polyvinyl alcohol, and then ball milling the mixed carbide powder; after the ball milling is completed, the mixed powder is spray-dried; step three, pressing the powder into a shape at a pressure of 50-200 MPa; step four, degreasing and sintering the pressed green body to obtain a high-entropy carbide-based cermet. The present invention can obtain a flexural strength better than 2100 MPa and a fracture toughness better than 8.5 MPa·m 0.5 , Rockwell hardness better than 92.0, high entropy carbide-based metal ceramic materials can be widely used in bearing materials, cutting tools, mold materials and other fields.

The invention provides a high-temperature-resistant and corrosion-resistant ammonia water nozzle coating and a preparation method thereof, and belongs to the field of coatings. The ammonia water nozzle coating is composed of a self-repairing metal ceramic bonding layer, an organic-inorganic hybrid corrosion-resistant layer and a functional surface layer which are sequentially arranged in a stacked mode. A coating of the self-repairing metal ceramic bonding layer is composed of the following components of 90-99 parts of NiCrAlY alloy and 1-8 parts of self-repairing microcapsules. A coating of the organic-inorganic hybrid corrosion-resistant layer is prepared from the following components: 40 to 60 parts of fluorinated polyurethane prepolymer, 20 to 40 parts of silicon-aluminum sol, 1 to 8 parts of disulfide bond modified epoxy resin and 10 to 20 parts of magnesium-aluminum hydrotalcite; the coating of the functionalized surface layer is prepared from the following components: 20 to 30 parts of stearic acid modified TiO2 particles, 60 to 80 parts of waterborne polyurethane and 2 to 7 parts of ionic liquid modified SiO2 nanoparticles. The corrosion resistance, the high temperature resistance and the self-repairing capacity of the ammonia water nozzle are improved at the same time.

A metal-ceramic substrate and an electronic component comprising a metal-ceramic substrate. The metal-ceramic substrate comprises: a) a ceramic body which has a main extension plane, b) a metal layer which is connected to the ceramic body, in a planar manner, the metal layer having a structuring region which comprises: (i) solid material in some areas and (ii) non-solid material in some areas, and c) a contact region comprising silver arranged on the metal layer, wherein, in a cross section through the metal-ceramic substrate perpendicular to the main extension plane, the structuring region has a geometry in which the following requirement is met:A⁡(BCDsolid) / A⁡(BCDtotal)>70⁢%,wherein A (BCDtotal) represents the total area of the triangle described by the points B, C and D, and A (BCDsolid) represents the area of the triangle described by the points B, C and D which is occupied by solid material.

The utility model provides an anti-chip-sticking metal ceramic milling cutter. The anti-chip-sticking metal ceramic milling cutter comprises a connecting column, the knife handle is arranged in the connecting column; the tool bit is arranged at one end of the tool handle, a chip removal groove is formed in a chip cutting part of the tool bit, and the tool handle and the tool bit are made of metal ceramic materials. The threaded rod is rotated to drive the conical block to move upwards, so that the threaded rod is separated from the screw hole, at the moment, the trapezoidal block is reset through the spring, the fixing rod is separated from the inserting hole, and then the extending length of the tool bit can be adjusted; and meanwhile, the conical block moves downwards to extrude the trapezoidal block and the fixing rod to move and compress the spring, so that the fixing rod extends into the insertion hole, and the cutter handle is fixed through the threaded rod and the fixing rod, so that the effect of adjusting the overall length of the milling cutter according to use requirements is achieved, and the use flexibility, applicability and efficiency of the milling cutter are effectively improved.

A cutting tool includes a substrate at least partially coated with a coating. The substrate is a cemented carbide, cermet or ceramic. The coating includes a layer of Ti(C,N), a layer of Al2O3 and there between a bonding layer. The Ti(C,N) layer is composed of columnar grains, wherein an average grain size D422 of the Ti(C,N) layer is 25-50 nm, and wherein the Ti(C,N) layer includes a portion B1 that is adjacent to the bonding layer. An average grain size of the Ti(C,N) grains in portion B1 is larger than the average grain size D422 in the whole Ti(C,N) layer. In the portion B1 of Ti(C,N) layer the Ti(C,N) grains has an average grain size of 140-300 nm.

The invention relates to an ultrasonic bonding process and a bonding process reliability evaluation method, and belongs to the technical field of semiconductor device packaging. The invention relates to an ultrasonic bonding process, which comprises the following steps of: 1, before bonding, carrying out plasma cleaning on a metal ceramic shell to remove surface contamination and an oxide layer; step 2, enabling the aluminum wire to penetrate into a chopper of a bonding machine, enabling the aluminum wire to be in contact with the surface of the gold-plated layer at the bonding pressure of 250cN-280cN by adopting the chopper, and enabling the aluminum wire to be in contact with the surface gold-plated layer of the bonding area in a low-pressure mode; and step 3, the bonding machine applies ultrasonic power of 10.5-12.3 W for 400-500 ms, the aluminum wire begins to rub and destroy the gold-plated layer on the surface of the bonding area under the action of the ultrasonic power, and after the gold-plated layer is destroyed, the aluminum wire penetrates through the gold-plated layer and forms an atomic-scale mutual diffusion interface with the nickel-plated layer. Reliable combination of gold, aluminum and nickel is achieved, meanwhile, a reliability evaluation method is provided, and therefore it is guaranteed that devices, circuits and the like adopting the ultrasonic bonding technology work reliably in the life cycle.

The invention discloses metal ceramic MAX-phase composite powder for spraying and a preparation method of the metal ceramic MAX-phase composite powder, and belongs to the field of metal ceramic composite materials. The method comprises the following steps: mixing Ni powder, Cr powder and Cr2AlC nano powder with deionized water, a binder and a dispersant according to a specific ratio, and carrying out wet ball milling to prepare uniform slurry; carrying out spray granulation to obtain primary spherical powder; and finally, carrying out spheroidizing treatment on the primary powder by adopting radio frequency plasma under the protection of inert gas to obtain a final product. The core of the preparation method is that through an optimized two-step process, many limitations in the application aspect of an existing MAX phase material are solved, and the composite powder which is high in sphericity degree, good in flowability, compact in interior and stable in MAX phase component is successfully prepared. The powder can be directly used for thermal spraying, and an ideal raw material is provided for preparing a high-performance MAX-phase metal ceramic coating.

The invention discloses metal material surface treatment equipment and a surface treatment method. The surface treatment method comprises the following steps: performing surface pretreatment on a metal matrix to form an activated matrix with target surface roughness; metal ceramic powder is directionally deposited on the surface of the activated substrate through a spraying system, and a porous substrate layer with uniform micropore channels is generated; depositing a gradient functional coating on the porous substrate layer, and dynamically adjusting the mixing proportion and the spraying angle of spraying powder to sequentially form a bottom layer bonding interface, a transition strengthening layer and a surface layer protection layer; the gradient functional coating is subjected to laser remelting treatment, and a coating interface is scanned through a multi-beam laser array, so that metallurgical bonding is achieved between the surface protection layer and the transition strengthening layer, and between the transition strengthening layer and the bottom bonding interface; in a single treatment process, multiple protection performances of high temperature resistance, corrosion resistance and fatigue resistance are synergistically improved, so that the problem of interface stripping caused by thermal expansion mismatch of a protective coating and a matrix is solved.

The invention relates to the technical field of electronic component manufacturing, solves the technical problem that interface contact resistance bounces and rises due to thermal stress mismatch, and particularly relates to an electronic component preparation parameter optimization method and system. Generating a gradient layer of which the thermal expansion coefficient continuously changes; and calculating a target thermal expansion coefficient for eliminating the interface thermal stress and an actual thermal expansion coefficient of the in-situ monitoring gradient layer based on the metal and ceramic concentration distribution function. According to the method, component continuous transition is achieved through metal / ceramic precursor dynamic flow control, continuous gradual change from metal to ceramic components is achieved, the coefficient of thermal expansion is in smooth transition in the thickness direction, and internal stress accumulation caused by material expansion difference is blocked from the source; and dynamic deposition regulation is combined to ensure that the thermal expansion gradient at any position is lower than a critical threshold value, and stripping or cracking caused by stress concentration in thermal circulation is avoided.

Provided is a multicolour cermet and / or ceramic article, and in particular a bezel of a timepiece, made by a method for injecting at least two materials of distinct colours, said article comprising a relief decoration of a colour different from the rest of the article, said decoration being made by laser ablation after injection of the two materials.

The invention belongs to the technical field of aluminum electrolysis, and relates to preparation and application of a metal ceramic inert anode material for aluminum electrolysis. The material for the metal ceramic inert anode is formed by compounding a high-entropy alloy phase and a ceramic phase; according to the preparation method disclosed by the invention, the AlCrFeNiV high-entropy alloy and the NiFe2O4 spinel ceramic are compounded to prepare the metal oxide ceramic. The manufacturing method of the metal ceramic inert anode is easy to operate, efficient and beneficial to application and popularization. And in an electrolytic test with the electrolyte being a cryolite-aluminum oxide system at 960 DEG C, good high-temperature conductivity, electrochemical stability, corrosion resistance and thermal shock resistance are achieved.

A titanium-based metal ceramic material with a six-element high-entropy alloy as a bonding phase is prepared by taking Ti-CN as a hard phase, the six-element high-entropy alloy as the bonding phase and Mo2C as a strengthening phase through mixing, ball milling, pretreatment, pre-press forming and high-temperature sintering in sequence, and according to the mass percent, the mass ratio of Ti-CN is 50-60%, the mass ratio of the six-element high-entropy alloy is 30-45%, and the mass ratio of Mo2C is 5-10%. According to the Ti-CN-based metal ceramic and the preparation method thereof, the ball-milled powder is pretreated through combination of electric field assistance and low-temperature pre-sintering, the overall performance of the metal ceramic obtained after SPS is effectively improved, the hardness of the prepared Ti-CN-based metal ceramic reaches HV1920, the fracture toughness reaches 15.9 MPa.m / , the bending strength reaches 2400 Mpa, the Ti-CN-based metal ceramic has excellent wear resistance and corrosion resistance, the wear rate is as low as 1.2 * 10 <-7 > mm < 3 > / N.m, and the service life of the Ti-CN-based metal ceramic is prolonged. The corrosion rate is as low as 0.0012 g / (m < 2 >. H).

The invention relates to a metal-ceramic substrate, to an electronic component comprising a metal-ceramic substrate, and to a method for producing a metal-ceramic substrate. The metal-ceramic substrate comprises: a) a ceramic body which has a main extension plane, b) a metal layer which is connected to the ceramic body in a planar manner, the metal layer having a structuring region which comprises (i) partially solid material and (ii) partially non-solid material, and c) a contact area which is arranged on the metal layer and comprises silver, the structuring region having a geometry in a cross-section through the metal-ceramic substrate perpendicular to the main extension plane, the following requirement being met: S(BCsolid) / S(BCtotal)>60%, wherein: S(BCtotal) represents the total length of the line between points B and C, and S(BCsolid) represents the length of the line between points B and C that intersects the solid material.

A solid oxide fuel cell is disclosed. The solid oxide fuel cell includes: an anode support electrode; a solid oxide electrolyte disposed on the anode support electrode; and a cathode electrode disposed on the solid oxide electrolyte. The anode support electrode includes: a first support layer having a porous structure and including a cermet of nickel and first yttria-stabilized zirconia containing yttria in a proportion of 1 mol% to 5 mol%; a second support layer which has a porous structure, is provided on the first support layer, and is formed from metal ceramic of nickel, second yttria-stabilized zirconia having a higher yttria content than the first yttria-stabilized zirconia, and alumina; and an anode functional layer which is provided on the second support layer so as to be in contact with the solid oxide electrolyte, and which is formed from a cermet of yttria-stabilized zirconia and nickel.

The invention relates to a preparation process of a metal ceramic bionic multilayer film, and belongs to the technical field of metal ceramic films, and the metal ceramic bionic multilayer film comprises a porous metal matrix, a gradient transition layer, a bionic lamination layer and a nanopore separation layer. According to the method, the failure problem of a traditional metal ceramic film under the extreme working condition is systematically solved through the multi-level innovative design, firstly, in the aspects of thermal stress elimination and interface strengthening, a five-layer gradient transition layer structure with the ceramic content changing is adopted, and the plasma spraying-laser remelting synchronous machining technology is combined; the thermal expansion coefficient of the metal matrix and the ceramic layer is continuously and gradually changed, so that the interface thermal stress is effectively reduced, the bonding strength is improved, the problems of cracking and layering under the high-temperature working condition are effectively solved, the service life is effectively prolonged, the structure is strengthened and toughened, and the bionic lamination design simulates the'brick-mud 'structure of a shell pearl layer; the nano-scale metal layer absorbs crack energy, and the ceramic layer provides rigid support, so that the fracture toughness is effectively improved.

The invention relates to the technical field of fuel cells, and provides a solid oxide fuel cell and a preparation method thereof, and the preparation method comprises the following steps: providing a half-cell precursor comprising an electrolyte layer and a NiO-based ceramic layer; placing the half-cell precursor in an acid solution for reaction treatment, selectively etching to remove at least part of NiO phase in the NiO-based ceramic layer, and cleaning to form a porous ceramic layer; injecting nickel slurry into pores of the porous ceramic layer, and performing drying and first calcination treatment to form a porous Ni-based metal ceramic composite anode layer; and preparing a porous cathode layer on the surface of the other side of the electrolyte layer to form the solid oxide fuel cell. According to the method, the NiO phase of the NiO-based ceramic layer is removed by using the pickling solution, and the nickel slurry is injected to construct the porous Ni-based metal ceramic composite anode, so that the problems that the pore structure is random and difficult to control when the porous anode is prepared by pore-forming of a traditional pore-forming agent and reduction of NiO by introducing hydrogen, and the active area of the anode is reduced due to migration, agglomeration and coarsening of Ni particles are solved.

This invention provides a powder material that improves flowability and particle breakage strength compared to existing technologies. The powder material of this invention has a dendritic structure (1). The dendritic structure (1) has a superhard alloy composition or a cermet composition.

The present application relates to the field of tool processing, and particularly relates to a processing technology for metal ceramic vertical installation forming groove tool. The processing technology comprises the following steps: step 1: processing a blank into a tool finish with a positioning bevel; step 2: processing a reference plane on the end face of the tool finish at the chip rolling groove, the included angle between the reference plane and the end face is the angle of the tool clearance angle; step 3: processing a tool tooth with a clearance angle and a side clearance angle at the reference plane of the tool finish, and detecting the tooth profile data of the tool tooth, the tooth profile data includes tooth width, tooth depth and angle, the detection of the tooth profile data adopts a projection comparison detection method, a standard tooth profile is fixed on a projection surface, and the tool tooth to be detected is enlarged through projection, if the tool tooth data is correct, the tool tooth data is coincident with the standard tooth profile; and step 4: processing the tool chip rolling groove, and performing passivation and coating treatment on the blade edge. Through the implementation of the present application, the processing and detection efficiency of the forming groove tool is improved.

The invention discloses a gradient composite reinforced anti-corrosion treatment method for a metal alloy guardrail, and belongs to the technical field of metal material surface treatment. The method comprises the following steps: carrying out ultrasonic cavitation micro-etching and electrochemical gradient activation pretreatment on the surface of a substrate; a metal ceramic composite layer containing a non-oxide ceramic reinforced phase is generated on the surface in situ through a micro-arc oxidation-chemical vapor deposition coupling process, and a component transition layer is formed with the assistance of vacuum gradient diffusion alloying treatment; and finally, coating an intelligent resin coating containing a corrosion inhibitor capsule and a corrosion indicator, and constructing a super-hydrophobic surface. By constructing a multi-layer composite protection system of the gradient diffusion layer / the metal ceramic layer / the intelligent coating / the super-hydrophobic layer, the anti-corrosion performance is remarkably improved, and the obtained guardrail has excellent bonding strength, wear resistance and long-acting anti-corrosion service life, has the intelligent functions of damage self-repairing and corrosion state visualization and is suitable for popularization and application. The method is especially suitable for harsh service environments.

The invention provides a connecting process of a metal ceramic membrane component, which comprises the following steps: uniformly coating the outer surface of a porous ceramic tube with a coating liquid prepared from ceramic powder and metal powder to obtain a porous ceramic tube with a metal ceramic coating; putting the porous ceramic tube into a mold, forming a plugging clamping groove in one end of the mold, forming a cavity among the outer wall of the porous ceramic tube, the plugging clamping groove and the mold, filling metal powder into the cavity, and arranging a plugging fixing piece at the other end of the mold, and finally, the obtained metal ceramic assembly blank is subjected to high-temperature sintering, and the metal ceramic membrane assembly can be prepared. According to the invention, effective combination of the metal film layer and the ceramic film layer is realized through a co-firing technology by utilizing a mold forming and surface modification process. The prepared metal ceramic membrane assembly can be directly connected with a device in a welded mode in the using process, the membrane layer precision is high, the thermal shock resistance is good, and the metal ceramic membrane assembly is suitable for high-temperature, high-pressure, high-viscosity and other severe systems in the petrochemical industry field.

A turbine blade and related method are disclosed. The blade includes an airfoil body having a radial outermost surface relative to a turbine rotor, a bond coat over the radial outermost surface, and an outermost abrasive layer over the bond coat. The outermost abrasive layer may include a graded oxide ceramic layer or a graded metal ceramic layer. In any event, the outermost abrasive layer is vacuum heat treated to harden the layer, resulting in increased rub and improved clearance between the blade tip, creating a smaller tip gap and lower leakage compared to conventional systems. The heat-treated abrasive layer is also resistant to oxidation at higher temperatures, e.g., greater than 1090° C. (˜2000°F.), caused by the increased use of higher temperature fuels, such as hydrogen. The vacuum heat treatment also results in thermal cycle testing improvements.