828 results about "Cermet" patented technology

The invention discloses a micro proportional valve gradient composite coating and a preparation method thereof, and belongs to the technical field of micro proportional valve surface strengthening manufacturing. Aiming at the corrosion-resistant and wear-resistant requirements of the micro proportional valve under the working conditions of strong corrosion, multiple impurities and high pressure difference, the interface strengthening and corrosion-resistant and wear-resistant performance optimization of a metal matrix and a functional coating are combined, and metal / ceramic / polymer gradient material design, spraying parameter suitability research and a coating porosity / bonding strength control method are covered; the valve core and valve seat protection device is suitable for high-efficiency protection technical systems of valve cores and valve seats of precise instruments such as gas chromatographs and mass spectrometers.

The invention belongs to the field of metal processing, and relates to an in-situ self-generated NiMoCoAlTi high-entropy alloy toughened metal ceramic material and a preparation method thereof. According to the invention, Ti (C, N) ceramic is used as a matrix, Ni, Mo, Co, Al and Ti are directly added as binders, and spark plasma coupling high-frequency induction sintering is carried out to obtain the high-temperature-resistant ceramic. The preparation method comprises the following steps: firstly, mixing Ti (C, N), Ni, Mo, Co, Al and Ti, then carrying out ball milling and drying to obtain powder, and carrying out spark plasma coupling high-frequency induction sintering. The method is beneficial to improving the mechanical property of the material, saves the preparation time of the high-entropy alloy powder, and has the advantages of being simple in preparation method, convenient to operate and the like. The obtained titanium carbonitride-based metal ceramic has higher toughness and hardness and excellent antifriction and wear-resisting properties, and can be used for manufacturing high-precision numerical control machine tool guide rails and other wear-resisting and corrosion-resisting parts.

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 discloses a preparation method of an ABM ceramic substrate with a metal through hole, and particularly relates to the technical field of ceramic substrates, a Si3N4 ceramic substrate is prepared through tape casting and hot pressed sintering, a conical stepped through hole is processed by using ultrafast femtosecond laser, the aperture of the through hole is 100-300 [mu] m, and the smoothness of the wall of the through hole is Rat; 1 [mu] m; performing oxygen plasma activation on the inner wall of the through hole to generate a Si-O active group; sputtering a nano titanium transition layer to enhance metal-ceramic interface bonding; the through holes are filled layer by layer through pulse electrochemical deposition, the current density is controlled, and a compact non-porous structure is achieved; in-Sn-Ag low-temperature active brazing filler metal is used, and a surface copper layer is bonded under the assistance of plasma; a fine circuit is formed through photoetching and micro-electroplating, the line width and the spacing of the circuit are the same, and the line width and the spacing of the circuit are both smaller than 20 microns; etching a micro-channel network on the back surface of the substrate by using ultraviolet laser, and filling heat-conducting silicone grease; and finally, carrying out vacuum annealing for 2 hours in an environment with the temperature of 250 DEG C.

The present invention relates to process for making a component comprising a composite material whereby three possible methods are detailed. More specifically, the invention relates to producing high performance composite materials, the method comprising surrounding nanofillers with specialized molecules that form covalently closed rings, where the matrix itself can be composed of polymers, metals, ceramics, or cement-based materials. The present invention also relates to a composite material comprising a nanofiller in the form of a nanotube or a graphene and further comprising a structural entity or matrix. Furthermore, the invention also relates to products or components made from the composite material.

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 relates to an energy-level-controllable small laser irradiation grafting and crosslinking system and an application method thereof, and belongs to the technical field of material processing and modification. The system is composed of an adjustable laser source, a focusing optical system, a laser energy regulation and control module, a machining platform, a chemical reaction auxiliary module, a real-time monitoring and feedback system and an intelligent control system, laser wavelength, power and pulse width can be accurately controlled, and micron-level machining precision is achieved. Compared with a traditional chemical grafting method, a thermal induction crosslinking method and a plasma treatment method, the method has the remarkable advantages of non-contact processing, low energy consumption, high precision, environmental friendliness and the like. The system supports efficient grafting and crosslinking of various materials (such as polymers, metals and ceramics), the processing efficiency and the material performance are remarkably improved, and an innovative solution is provided for material functionalization and green manufacturing.

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 coated cutting tool for metal machining has a base body of cemented carbide, cermet, ceramics, steel or high-speed steel, and a wear resistant coating deposited thereon. The coating includes a layer of Ti1-xAlxCyNz with 0.40≤x≤0.95, 0≤y≤0.10 and 0.85≤z≤1.15, and a portion of MeCaNb, 0≤a≤1, 0≤b≤1, a+b=1, present on the layer of Ti1-xAlxCyNz. The portion of MeCaNb covers from 5 to 28% of the layer of Ti1-xAlxCyNz. A process for the production of the coated cutting tool and the use of the coated cutting tool in machining of stainless steel is also provided.

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.

The invention belongs to the field of inorganic nonmetals, discloses a wide-temperature-range inorganic negative thermal expansion material and a synthesis method thereof, and requests to protect application of a Mn2V2O7 material as a negative thermal expansion material. The Mn2V2O7 material can be prepared on the basis of a solid-phase reaction method. The negative thermal expansion performance of the Mn2V2O7 material is disclosed for the first time, the negative thermal expansion temperature range is large and is 69-497 DEG C, the negative thermal expansion coefficient reaches-4 * 10 <-6 > DEG C <-1 >, and the Mn2V2O7 material is a wide-temperature-range inorganic negative thermal expansion material. The Mn2V2O7 material does not contain Hf, Dy, Lu, W and other rare metal elements, has a large negative thermal expansion temperature interval, and can be compounded with organic matters, metals, ceramics and the like to adjust the thermal expansion coefficient of the Mn2V2O7 material.

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 the field of metal materials, in particular to a preparation method of an ultra-high-speed laser cladding Al2O3 metal ceramic coating. The method comprises the following steps that iron-based metal powder, aluminum oxide ceramic powder and silicon powder are prepared according to the design proportion, the iron-based metal powder, the aluminum oxide ceramic powder and the silicon powder are evenly mixed and then subjected to ultra-high-speed laser cladding, the mass percent of aluminum oxide in the obtained composite powder is 6-10%, the mass percent of silicon powder in the obtained composite powder is 0.5-5%, and when ultra-high-speed laser cladding is carried out, the thickness of the composite powder ranges from 0.5 mm to 5 mm; the laser power ranges from 1500 W to 2400 W, the scanning speed ranges from 12 m / min to 20 m / min, the defocusing amount is + 1 mm, the powder feeding amount ranges from 22 g / min to 30 g / min, the lap joint rate ranges from 60% to 65%, and powder feeding and protective gas is argon. The component design is reasonable, the cost is low, and the obtained product is high in hardness, resistant to corrosion and convenient for industrial application.

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 a metal ceramic substrate and a preparation method thereof, and belongs to the technical field of ceramic substrates. The preparation method comprises the following steps: S1, carrying out patterning treatment on the surface of a ceramic substrate to form a pattern with preset depth and width on the surface of the ceramic substrate; depositing a bonding layer on the patterned surface through a physical vapor deposition technology to obtain a composite ceramic substrate; s2, depositing a bonding layer on the surface of the metal layer through a physical vapor deposition technology to obtain a composite metal layer; and S3, the bonding layer of the composite metal layer is attached to the bonding layer of the composite ceramic substrate, and the metal ceramic substrate is obtained through hot pressing. The interface between the metal layer and the ceramic substrate is free of pores, and oxide is not formed; and the bonding strength of the metal layer and the ceramic substrate is increased, so that the metal ceramic substrate has better thermal stability.

The invention discloses a titanium carbonitride-based metal ceramic alloy with a dispersive distribution micro-nano twin-crystal core ring structure and a preparation method thereof, the metal ceramic alloy comprises hard phase powder, hard phase powder, hard phase powder and hard phase powder, the hard phase powder comprises TiCN powder, TiC powder and WC powder, and the hard phase powder comprises TiC powder, TiC powder and WC powder; binding phase powder and multi-component alloy strengthening powder. According to the core-ring shell composite crystal grain, the core is 50-200 nm superfine TiCN crystal grains (high-hardness phase), and basic strength is provided; according to the annular shell, the core is wrapped with the oriented-growth TiCN whiskers with the large length-diameter ratio, the whisker bridging effect is formed, and the crack path is deflected. And dispersion bicrystal distribution: micron-sized coarse grains and submicron fine grains are in bimodal distribution according to the volume ratio of 7: 3, the coarse grains hinder crack propagation, and the fine grains inhibit grain boundary slippage. In-situ reaction strengthening: MoSiB and other components are added, a MoO / TiO self-lubricating film is generated in high-temperature friction, the wear rate is reduced, and negative wear is realized.

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.