70 results about "Functionally gradient material" patented technology

The method for preparing functional gradient material by adopting doctor-blade casting process includes the following steps: 1). mixing ceramic powder, strong-magnetic metal powder, organic solvent and additive according to a certain proportion, stirring them in ball-grinding machine to obtain uniform dispersed slurry material; 2) in the static magnetic field with magnetic field intensity of 0.1-5.0 Tesla making the slurry material into film by means of doctor-blade casting process; and (3) drying and sintering, and forming.

The invention discloses a high-temperature polymer-based electromagnetic shielding functionally gradient material. The material is characterized in that the content of filler changes in a gradient manner along the thickness direction of the material. The electromagnetic shielding property of the functionally gradient material can be up to 45-90dB; the long-time working temperature of the material is 150 DEG C, and over 85% of original electromagnetic shielding property still can be kept after thermal treatment at 200 DEG C for 240 hours. Therefore, the high-temperature polymer-based electromagnetic shielding functionally gradient material can be widely applied to the fields of protection of electronic equipment products with heat-resisting and electromagnetic shielding demands or other applications.

Methods and associated structures of forming microelectronic devices are described. Those methods may include forming a first layer of functionalized nanoparticles on a substrate by immersing the substrate in at least one of a solvent and a polymer matrix, wherein at least one of the solvent and the polymer matrix comprises a plurality of functionalized nanoparticles; and forming a second layer of functionalized nanoparticles on the first layer of functionalized particles, wherein there is a gradient in a property between the first layer and the second layer.

A two-way explosion concrete device of self-spread preheat powder aqueous medium is used for manufacturing a high-density hard concrete metal or ceramic compound materials and functionally gradient materials of the ceramic compound materials, which consists of a plane wave generator, a high grade energy main charge, a pressure work steel tube, a waterseal unit, a wave impedance match unit, an outer protection tub or a protective unit, a self-spread dust electrical heating unit and a protective unit of sample. The present invention is designed to provide the two-way explosion concrete device of self-spread preheat powder aqueous medium that can produce a high-energy explosive detonated by plane detonation wave produced by two plane wave generators with symmetry layout and two-way explosion by making use of aqueous medium to transfer a plane explosive shock wave and self-spread high temperature synthetic reaction preheat powder.

The invention discloses a method for ultrasonic auxiliary laser additive manufacturing of a two-dimension titanium-based functional gradient material, and belongs to the technical field of laser additive manufacturing. The two-dimension titanium-based functional gradient material is in one-dimension gradient transition in the XY and YZ plane and is in two-dimension gradient transition in space. According to the preset each-deposition-layer gradient transition form, the area a at the lower left corner is in 7-shaped transition to the area k at the upper right corner, accordingly, bottom ultrasonic is ensured, and sufficient interference is conducted on the molten bath flowing and solidifying process during high-proportion ceramic particle adding. In different gradient areas in the XY and YZplane, optimized direct laser deposition technological parameters and ultrasonic acting parameters are adopted, heat accumulation, the size and content of non-melted ceramic particles and the size ofa thick branch-shaped primary phase are reduced, and accordingly the integral performance of the titanium-based functional gradient material is improved. A laser head conducts scanning according to the 7-shaped path, the number of gradient combined interfaces between adjacent ways is reduced, and the integral performance of the titanium-based functional gradient material can be better improved. By means of the method, uniform distribution of the ceramic particles can be promoted, thick dendritic crystals are crushed, a microcosmic structure is refined, and accordingly the integral performanceof the two-dimension titanium-based functional gradient material is improved.

The invention discloses a preparation method of a Ti3SiC2/SiC functionally gradient material, comprising the steps of mixing Ti3SiC2 powder and SiC powder in a die layer by layer in a gradient way, then preparing a blank, performing vacuum hot-pressing sintering on the blank to obtain a green body, and sequentially performing dipping densification and pyrolysis treatment on the green body; the SiC powder comprises micron beta-SiC powder and nanometer beta-SiC powder; the vacuum hot-pressing sintering temperature is 1600-1700 DEG C, and is kept for 3-5h, and the maximum pressure is 25MPa; the dipping densification comprises performing dipping densification on gradient layers containing 60-100 vol. percent of SiC in the green body subjected to the hot-pressing sintering in polycarbosilane liquid. The Ti3SiC2/SiC functionally gradient material prepared by the method is high in compactness, contains multiple gradient layers along the thickness direction from Ti3SiC2 to SiC (designing can be performed as required), the structure is uniform and compact in each gradient layer, interfaces among the gradient layers are moderately combined, the mechanical strength is high, the breaking tenacity is good, under high temperature, the oxidation resistance and the thermal shock resistance are good, and the Ti3SiC2/SiC functionally gradient material having 11 gradient layers and the thickness of 8-15mm can be prepared.

The invention discloses a method for molding hard alloy functionally gradient materials. The method includes mixing additives with alloy materials to obtain mixtures; carrying out compound pressure molding on the obtained mixtures in compound die groups to obtain blanks; sintering the blanks to obtain the hard alloy functionally gradient materials. The compound die groups comprise outer-layer dies with high expansion coefficients, intermediate transition-layer die groups and inner-layer dies with low expansion coefficients. The method has the advantages that the large and multi-component hard alloy functionally gradient composite materials which are of complicated contour structures and are free of obvious interfaces can be manufactured by the aid of the method; the sintered molded functionally gradient materials are provided with gradient grain structures along the thickness directions of the sintered molded functionally gradient materials, the gradient grain structures are provided with the different components, have different grain sizes and are free of obvious interfaces, and accordingly the molded hard alloy materials are excellent in comprehensive mechanical performance with high hardness, abrasion resistance, strength and toughness.

The invention relates to a coaxial wire-powder-gas-electric arc 3D printing method. The method is realized through a coaxial wire-powder-gas-electric arc 3D printing device. The device comprises a gas shield welding gun and a coaxial gas powder conveying unit. The gas shield welding gun is a consumable electrode gas shield welding gun. The coaxial gas powder conveying unit comprises a powder feeding unit, a gas feeding unit and a coaxial spiral gas powder cover. The coaxial gas powder conveying unit is of a multi-channel structure, and channels are all provided with powder feeding speed controller and a gas feeding flowmeters. According to the 3D printing method using the device, the powder adding rate can be regulated and controlled in real time, the method is suitable for additive manufacturing of conventional metal products, functionally gradient materials and composites, obtained products are even in ingredient, product machining process is short, and subsequent machining amount is small.

The invention discloses a co-extrusion preparation method of polymer functionally gradient materials (FGM) and products, which comprises the following steps: (1) preparing two or more kinds of polymers according to the certain mass percent, mechanically mixing the prepared raw materials, and then, adding the mixture into a screw extruder; (2) at the shaping phase of the co-extrusion process of the mixture, setting a certain temperature gradient field (delta T) for the blending melt which flows in a shaping mold; (3) enabling the shaped molding object which is extruded out of the shaping mold and is in the melting state to pass through a same or different certain temperature gradient field (delta T'); and (4) leading the molding object into a forming mold quickly by a traction device, and cooling the molding object below the melting point within a very short time. The invention has the advantage of providing a method capable of industrialized implementation for preparing polymers or polymer functionally gradient materials (FGM) and products by using traditional equipment and technology for processing polymers.

The invention relates to a preparation method of a Cu-Ti2 AlC functionally gradient material. The preparation method is characterized in that a composite material which contains pure Cu or main ingredient Cu is formed at one side of the prepared gradient material; the compound which contains pure Ti2AlC or main ingredient Ti2AlC is arranged at the other side of the prepared gradient material; 1-4 interlayers are arranged; the contents of Cu and Ti2AlC change in gradient along with the thickness direction, and gradually change along with the performance; the hardness and strength of the material are obviously improved along with the direction from Cu to enriched Ti2AlC; the oxidation resistance and the anti-high temperature performance are improved; the wear-resisting property and the elastic modulus are gradually improved; and the toughness, the electric conductivity and the thermal conductivity are obviously improved along the direction from Ti2AlC to enriched Cu. The material has significance as to a special environment which has different operational performances as to different contact surfaces; the material is prepared from Cu and Ti2AlC powder used as raw materials in a manner of hot-pressed sintering under certain atmosphere after evenly mixing and layered charging, wherein the sintering temperature is 800-1000 DEG C; the heating rate is 8-20 DEG C/min; the pressure is 20-40 MPa; and heat preservation time is 0.5-3 hours. By adopting a hot-pressed sintering method, the prepared gradient material is high in compactness, excellent in performance, and good in industrialized prospect.

The invention discloses a geometric analysis method based functionally gradient material part modeling method and aims to solve the technical problem of low efficiency of an existing functionally gradient material part modeling method. According to the technical scheme, the method includes: adopting a Poisson equation for precisely describing part internal material distribution; adopting a tensor product NUPBS parameter entity for coupling expression of functionally gradient material part geometry and materials; adopting material information appointed by a designer as boundary conditions; solving the Poisson equation according to an isogeometric analysis algorithm to finally realize functionally gradient material modeling. Since the Poisson equation is a partial differential equation and a computational domain of the Poisson equation can be any complicated geometric spaces, high adaptability is realized; part geometric expression and material space calculation can be brought into a unified framework according to the isogeometric analysis algorithm, so that procedures of node interpolation, model conversion and the like are avoided, and material space calculation efficiency is improved.

The invention discloses a preparation method for FGM of ZrO2-based n-HA. The method comprises the following steps: preparing FGM powder; preparing a green body specimen; sintering the specimen. The materials disclosed by the invention fully utilize the advantages of good biocompatibility and biological activity of n-HA and high mechanical strength of biological inert materials, namely ZrO2, and further have strong practicability and theoretical significance.

The invention relates to an infinitely-variable-speed ultrasonic microdroplet jetting additive manufacturing device and method for multiple materials, and belongs to the field of additive manufacturing. A delta sport substrate device is fixed inside a rack and located below a top plate of the rack. A focused ultrasound system is fixed inside the rack and located above a bottom plate of the rack. A material pool device is located above the focused ultrasound system and fixed to the rack. Feeding devices are fixed to supporting posts of the rack. According to the infinitely-variable-speed ultrasonic microdroplet jetting additive manufacturing device and method for the multiple materials, the focused ultrasound technique and the additive manufacturing technique are combined, the size of jetted liquid drops is not limited by sprayers which are not needed, sprayer blocking is avoided, and the manufacturing cost is lowered; microdroplets are jetted from bottom to top, satellite droplets are prevented, and the printing precision is improved; mixed additive manufacturing for the multiple materials and additive manufacturing for functionally gradient materials can be achieved; and in the printing process, the microdroplet jetting frequency is adjustable, the microdroplet diameter is adjustable, and infinitely-variable-speed microdroplet jetting additive manufacturing can be achieved.

The invention relates to a manufacturing method for a functionally gradient material capable of reinforcing a tuyere. The manufacturing method comprises the following steps: firstly, cleaning oil stain and dust on the inner wall and the small end of the copper matrix tuyere, and pre-heating to about 500 DEG C; overlaying a Ni202 transition layer on the copper matrix tuyere; overlaying a CoGrW reinforcing layer on the transition layer; performing sandblast texturing treatment on the reinforcing layer for enabling the surface to be flat, wherein the whole overlaying layer is 3 mm in thickness; plasma-spraying a ZrO2 thermal barrier coating with the thickness of 0.5 mm after the CoGrW reinforcing layer is preheated, in order to prevent the phenomenon that cracks exist in the CoGrW reinforcing layer during the use due to the different heat conductivity coefficient. According to the invention, the transition layer and the reinforcing layer are overlaid, the thermal barrier coating is plasma-sprayed, and the overlaying layer can reach the thickness and metallurgical bonding strength required for use, so that falling can be prevented during the use, the copper matrix tuyere can be protected by the thermal barrier coating during use, the cracking or falling of the reinforcing layer caused by thermal stress is reduced, the hardness is high, the abrasion resistance is excellent, the cost is low, the production efficiency is high, and the service life can reach 10 months.

A method of manufacturing a functionally gradient material having a gradient from a first material to a second material different to the first material by ejecting inks onto a base material from a plurality of inkjet heads, includes the steps of: supplying a first functional ink containing the first material to a first inkjet head; supplying a second functional ink containing the second material to a second inkjet head; specifying a ratio between a volume of the first functional ink ejected from the first inkjet head and a volume of the second functional ink ejected from the second inkjet head; causing the first inkjet head to eject the first functional ink and/or causing the second inkjet head to eject the second functional ink, in accordance with the specified ratio, so as to form one layer; and stacking a plurality of layers onto the base material by repeating the forming step, so as to obtain a laminated body, wherein in the control step, the ratio between the first functional ink and the second functional ink is specified in such a manner that respective layers of the plurality of layers progressively have a smaller ratio of the first functional ink and a larger ratio of the second functional ink, toward an upper layer.

The invention relates to the field of 4D printing of intelligent components and functionally-gradient materials, in particular to a method for 4D printing of functionally-gradient titanium-nickel shape memory alloy components. According to the method, direct metal deposition is carried out on titanium-nickel shape memory alloy powder through laser additive manufacturing equipment, function division is carried out on different areas including a stress bearing area and a structural deformation area when three-dimensional modeling is carried out on a workpiece, and different laser process parameters are set for the different functional areas during additive manufacturing. The reasonable titanium-nickel alloy component proportion is selected, and the gradient materials with the function, the structure and the microstructure changing continuously are prepared. According to the method, the gradient materials with the function and mechanical property changing along with the change of the internal positions of the workpieces can be prepared, reasonable function partitioning can be achieved, and the method is simple in process, easy to implement, good in applicability and high in functionality.

The invention discloses a preparation method of a controlled degradation magnesium-based functional gradient material. The method comprises the steps of (1) annealing treatment of a magnesium alloy; (2) drilling of the annealed magnesium alloy; (3) HA or beta-TCP loading of the drilled magnesium alloy; (4) friction stir processing of the magnesium alloy loaded with hydroxyapatite or tricalcium phosphate, specifically, under the conditions that the rotary speed is 300-1700 r/min, the feeding speed is 10-50 mm/min and the press amount is 0.5-3 mm, 2-6 passes of friction stirring are conducted, and an Mg-based/HA layer or Mg-based/beta-TCP layer which is 0.5-3 mm thick is obtained; and (5) surface grinding, cleaning and drying with the Mg-based/HA layer or Mg-based/belt-TCP layer as the substrate material, and then electro-deposition so as to obtain a hydroxyapatite coating being 1-12 [mu]m thick on the surface of the substrate material, so that the controlled degradation magnesium-basedfunctional gradient material is obtained. The controlled degradation magnesium-based functional gradient material has good biocompatibility, bone inductivity, corrosion resistance and degradation controllability, and achieves the sequential degradation and controlled degradation of the magnesium alloy as a bone implanting material.

The invention discloses a light curing preparation device of a gradient material. The device comprises a horizontal motion table, a light curing system, a horizontal driver, an upper and lower mobile station, and an upper and lower driver. The invention also discloses a light curing preparation method based on the device. The method is as below: first, modeling a biological functionally gradient material to obtain a model; then calculating the contour information of each layer of the model by the 3D printing layered software, and generating light curing code by using the contour information; then, placing different light curing composite solutions in different solution baths; and at last, controlling the light curing device according to the code for light curing molding to prepare the graded material, so as to realize proportion control of the gradient material.

A making method of a silicon carbide/carbon functional gradient material is as follows: a carbon graphite material is used as a base material for silicon infiltration treatment at 1500-1700 DEG C, and then is put in a high temperature vacuum graphitizing furnace for reacting with silicon to produce the silicon carbide/carbon functional gradient material; the silicon carbide/carbon functional gradient material is prepared by successive combination of two materials with different properties into one, wherein one material is continuously transited to the other material, and no obvious interface is produced among various parts of the material. The silicon carbide/carbon functional gradient material has self-lubricating property, good heat conductivity and electrical conductivity, good thermal shock resistance and high temperature strength of the graphite material, and high hardness and high strength, high temperature oxidation resistance, strong corrosion resistance, abrasion resistance and other properties of silicon carbide.

The invention discloses a method for preparing a functionally gradient material through an axially uniform magnetic field and a directional solidification device thereof. The magnetic field intensityrange of an axial magnetic field generated through a superconducting gradient strong magnet is not larger than 5 T, thermo-electromagnetic force induced by the magnetic field acts on alloy melt, thermo-electromagnetic flow is generated, as the content of precipitated phases in the alloy melt is increased along with decrease of the temperature and the temperature gradient exists in the directionalsolidification process, after the melt passes low-temperature positions, precipitation of the precipitated phases and rapid growth of the precipitated phases are promoted, the volume fraction of the precipitated phases exceeds the volume fraction of precipitated phases generated when the alloy is in equilibrium solidification, along with directional solidification, the content of solutes in the remaining melt is reduced, even the melt is turned into solute-depleted melt, finally the melt is solidified with the ingredients of eutectic, the functionally gradient material with the eutectic arranged on the upper portion and primary phases and eutectic phases on the lower portion is formed, and a novel technology direction is provided for preparing special materials through the axially uniformmagnetic field.