225results about How to "Improve the bonding strength of the interface" patented technology

The invention relates to an in situ nano TiC ceramic particle reinforced aluminum based composite material and a preparation method thereof. According to the invention, an in situ nano TiC ceramic particle reinforced aluminum or aluminum alloy based composite material is prepared by using a combustion synthesis chemical reaction method and a hot-press technology; and the size of the TiC ceramic particle synthesized by an in situ reaction is below 100 nm, and the weight percentage content of the TiC ceramic particle is 3-30. The preparation method comprises the following steps: 1) mixing reactant powder materials in a certain proportion and then making blanks; 2) evenly mixing in a drum-type ball mill and a triturator in turn; 3) pressing at the room temperature so as to form reaction prefabricated blocks; and 4) putting a graphite mould with the prefabricated blocks in a vacuum/atmosphere protected combustion reaction furnace with a hydraulic device and then initiating a combustion reaction, immediately applying an axial pressure of 40+/-5 MPa to the prefabricated blocks once the combustion reaction occurs, and cooling the prefabricated blocks to room temperature along with the furnace after keeping the pressure for 30-40 seconds, so as to synthesize the nano TiC ceramic particle reinforced pure aluminum or aluminum alloy based composite material.

The invention discloses a high-entropy alloy particle reinforced aluminum base composite material and a stirring casting preparation process thereof. The preparation process adopts mechanical alloying to prepare high-entropy alloy powder and screen to obtain high-entropy alloy particles; the high-entropy alloy particles are sealed by adopting an aluminum alloy pipe having the same material with a basal body; the aluminum alloy pipe weighed in a segmented manner is added in the molten basal body; the high-entropy alloy particles are dispersed by a stirring mode; and the high-entropy alloy particle reinforced aluminum base composite material is prepared by a casting process. The high-entropy alloy particles are 0.1-35%; aluminum alloys are 65-99.9%; and the sum of the two is 1. The high-entropy alloy particles in the structure of the prepared composite material are uniformly dispersed; the high-entropy alloy and aluminum alloy interface bonding compatibility is excellent; the strength and the toughness are excellent; the preparation process is simple; the powder has no need to be treated; the cost is low; the stability is good; and the composite material is suitable for large-batch production and standard production, and is excellent in promotion and application prospect.

The invention provides a method for connecting plastic and a metal heterostructure. The method comprises the following steps that S1, laser roughening treatment is conducted on the surface of a to-be-connected metal part, and local protrusions and dents are generated on the surface of the metal part, so that a metallic oxide layer is formed; S2, the metal part subjected to laser roughening treatment and a to-be-connected plastic part are hot-pressed, so that the metal part and the plastic part are bonded together; and S3, out-of-focus laser beams are adopted to penetrate through the plastic part so as to reach the interface between the plastic part and the metal part, and the portion, at the interface, of the plastic part is partially melted. According to the method for connecting the plastic and the metal heterostructure, operation is easy, the mechanical engaging and chemical bonding degree of the plastic and metal is increased through the required local protrusions and dents formed on the surface of the metal part and partial heating and temperature control of the interface, tight bonding of the plastic and the metal at the interface is facilitated, and the interface bonding strength and airtightness of the plastic and the metal heterostructure are improved accordingly.

The invention relates to a chitosan nanofiber composite film for adsorbing and separating heavy metal ions and a preparation method and application thereof. The composite film is a chitosan electrospun nanofiber/non-woven fabric base composite film. The method for preparing the composite film comprises the following steps: performing electro-spinning on chitosan on a non-woven fabric base through an electrostatic spinning method, thereby obtaining a composite fiber film; and combining multiple composite fiber film layers in different manners, thereby preparing an adsorption and separation medium. The adsorption and separation medium is filled in a filter separator and can be used for dynamically adsorbing and filtering to remove heavy metal ions in water. The composite film disclosed by the invention is simple and convenient in preparation method, green, environmental-friendly, low in cost, easy to popularize and apply, high in heavy metal wastewater treatment efficiency and high in selectivity, can be used for purifying and treating heavy metals in industrial and domestic wastewater, and has important social and economical benefits.

The invention relates to a hyperbranched polysiloxane grafted graphene/bismaleimide composite material and a preparation method thereof. The composite material is prepared by casting for forming and comprises 0.1-10 weight parts of graphene modified by hyperbranched polysiloxane, 100 weight parts of diphenylmethane bismaleimide and 10-100 weight parts of bisphenol A diene propyl ether, wherein for further raising the dispersibility of graphene in resins and the interface bonding strength between the graphene and resins, the graphene is modified by conducting silicon-hydrogen addition polymerization; according to the bisphenol A diene propyl ether included in the resins, the prepolymer has low viscosity in a wide temperature range, thus the dispersibility of graphene in benefited; the bisphenol A diene propyl ether can be rearranged into 2,2'-diallyl bisphenol A at a high temperature to react with the diphenylmethane bismaleimide, thus the strength of the resins is guaranteed. The prepared composite material has good mechanical properties and excellent friction properties, and can be used as slide plates of non-lubricated water pumps or dynamic seal coatings of engines, etc.

The invention relates to a novel metal ceramic composite material and a preparation method thereof. The novel metal ceramic composite material adopts Al2O3 ceramic as matrix and adopts Ti(C, N) ceramic hard particles and Fe metal as disperse phase. The novel metal ceramic composite material comprises the following main components by weight percent: 50-70 percent of Al2O3, 20-30 percent of Ti(C, N), 5-20 percent of Fe and the balance of inevitable impurities such as Mn, Si, Ca and the like. The preparation method selects Panzhihua ilmenite (FeTiO3) as raw material rich in China, adopts a hot pressed sintering technique to directly prepare low-cost Al2O3/Ti(C, N)/Fe metal ceramic composite material on the basis of carbothermal and aluminithermic reduction. Compared with the similar metal ceramic composite material, the novel metal ceramic composite material has quite good comprehensive mechanical property and excellent wear resistance, corrosion resistance, oxidation resistance, thermal shock resistance and the like, also has simple preparation technique and low cost and opens up a new way for fully and effectively utilizing rich resources in China.

The invention relates to a preparation method for achieving strong metallurgical bonding on a dissimilar metal interface and belongs to the technical field of dissimilar metal composite materials. Thepreparation method is characterized in that the high performance dissimilar metal composite material achieving strong metallurgical bonding on the interface is obtained by fully exerting the advantages of existing hot rolling composite method and cold rolling composite method and overcoming the defects of the methods, combining steps of polishing, laminating, room temperature rolling, short-timeheating, high-temperature rolling and the like and controlling times and temperatures in the preparation process of the dissimilar metal composite material cooperatively. The preparation method provided by the invention has the advantages that the preparation method is simple in process, low in energy consumption, short in period, less in equipment investment, low in cost and high in efficiency, and can achieve strong metallurgical bonding on the dissimilar metal interface by using existing polishing equipment, heating furnace and rolling mills (one rolling mill or arbitrarily arranged two rolling mills); compared with the interfacial bonding strength of the dissimilar metal composite material prepared by the existing hot rolling composite method and cold rolling composite method, the interfacial bonding strength is improved by over 20-50%, and the application range of the high performance dissimilar metal composite metal is wider.

The invention belongs to the field of laser processing, and specifically provides an ultrahigh-speed laser cladding system. The system is characterized in that ultrahigh-speed laser cladding linearityspeed can be realized when a workpiece rotates at a high speed; laser and powder mutually act, and the system parameters are adjusted and matched, thus a dense cladding layer can be formed on the surface of the workpiece. Compared with a traditional laser cladding system, the ultrahigh-speed laser cladding system has the advantages that the laser cladding efficiency is improved dozens of times, and moreover, the obtained cladding layer is of a completely metallurgical combination form; the surface smoothness is high; the material utilization rate is high; the energy consumption is low; the production cost can be extremely saved; and the production efficiency is improved.

The invention discloses a Cu-TiNi composite material preparation method, comprising the following steps: firstly, raw material preparation; secondly, composite structure manufacture; thirdly, hot-rolling compounding; fourthly, solid melting process; fifthly, crushing stress aging treatment. The invention has the advantages that: the preparation method is simple technology; the combining limiting interface of Cu-TiNi composite material has high-strength, small expansion coefficient, high heat conduction rate, low density; the invention is a renewing product for the prior electronic packaging material; the invention is suitable for industrial production, which satisfies the requirements of modern electronic industry for packaging material.

The invention relates to a preparation method of a carbon-nanotube-enhanced copper-based composite material, and belongs to the technical field of composite material preparation. The method comprises:putting carbon nanotubes in an acid solution, performing ultrasonic dispersion treatment for 20-120 min, performing heating to 50-80 DEG C, maintaining the constant temperature for 5-15 h, and performing filtering, washing, and drying to obtain pre-treated carbon nanotubes; preparing a carbon nanotube and copper salt composite solution with the pre-treated carbon nanotubes; taking a pure titaniumplate as a cathode, a pure copper plate as an anode, the carbon nanotube and copper salt composite solution as a plating solution, performing electroplating at the temperature of 25-50 DEG C with thecurrent density of the cathode being 0.5-20 A/dm2; when the deposition electric quantity is 50-200 C, taking the cathode out, peeling a composite film off, and cleaning and drying the composite filmto obtain carbon-nanotube-enhanced copper-based composite film; laying the composite films layer by layer, and performing compacting molding to obtain a carbon-nanotube-enhanced copper-based compositeblock; and sintering the composite block to obtain the carbon-nanotube-enhanced copper-based composite material. In the composite material, carbon nanotubes are uniformly distributed in the compositefilm layer in a network manner.

The invention relates to a preparation for a fly ash-based geopolymer and an application method thereof. The method mainly comprises the following steps: excitant solution and fly ash are mixed and stirred to paste; the paste is injected into a mold frame for molding; the molded product is maintained; the excitant solution is 2mol/L-5mol/L of silicate solution or water glass solution with the solid content to be 25-40% and the modulus to be 1.0-1.5. The preparation and the application method of the fly ash-based geopolymer fully use the industrial waste fly ash, which has the advantages of reducing cost, being favorable for environmental protection, reducing energy consumption and convenient application; the product obtained has the excellent characteristic of geopolymer.

The invention relates to a preparing method of an aramid fiber/epoxy composite material, and an MXene modification treating liquid. The method includes: (1) dipping aramid fiber into an acetone solution for 1-2 h; (2) dipping the aramid fiber into a nitric acid solution for 0.5-1 h to perform surface pretreatment; (3) washing the dipped aramid fiber with deionized water, filtering and drying; (4) dipping the aramid fiber into the MXene modification treating liquid, filtering and drying; and (5) preparing the aramid fiber and epoxy resin into a fiber plate, and curing and forming the composite material plate by utilization of a mould pressing curing method. The MXene modification treating liquid comprises following components by weight: 0.1-5 parts of an MXene compound, 15-25 parts of acetone, 46-68 parts of deionized water, 1-10 parts of isocyanate, 1-3 parts of urea and 1-2 parts of nitric acid. The MXene compound is adopted as a connecting bond, thus improving the interface toughness performance of the aramid fiber/epoxy composite material and improving the overall mechanical properties of the composite material.

The invention discloses a forming method for a high-interface-bonding-strength copper/aluminum composite material, and belongs to the technical field of metal laminar composite material preparing. According to the forming method, to-be-combined surfaces of a copper plate and an aluminum plate are machined, macroscopic rugged to-be-combined surfaces are obtained, a louvre blade is adopted for conducting grinding treatment on the to-be-combined surfaces, the direction of stripes formed through grinding is perpendicular to the rolling direction, then, the copper plate and the aluminum plate are overlapped up and down or arranged left and right side by side to be in butt joint, and a copper/aluminum assembly is obtained; then, single-pass low-rolling-reduction cold rolling pre-composition is conducted, high-temperature short-time heating is conducted, finally, single-pass hot rolling final composition is conducted, and the high-interface-bonding-strength copper/aluminum composite materialis obtained. The forming method has the advantages that the capability requirement for a rolling machine needed for producing the copper/aluminum composite material is low, the technology is simple, the production cost is low, a macroscopic composite interface of a non-flat artificial structure and a microcosmic composite interface of a particle pinning structure can be obtained, the interface bonding strength is larger than or equal to 90 MPa, the applicable copper/aluminum composite material range is wide, and industrial popularization is easy.

The invention discloses a preparation method of a high-performance titanium/steel bimetallic composite plate, and belongs to the technical field of preparation of bimetallic composite plates. A pure titanium slab and a low-carbon steel slab are subjected to annealing treatment, the hardness of the slabs is reduced, and the hardness of the pure titanium slab and the hardness of the low-carbon steelslab are close; then the to-be-composited surfaces of the slabs are cleaned, degreased and ground, wherein the grinding stripe direction is perpendicular to the rolling direction; then the pure titanium slab and the low-carbon steel slab are stacked to obtain a combined slab, the head of the combined slab is riveted, the combined slab is subjected to single-pass cold rolling pre-compounding, andthen heating is carried out; and finally, single-pass hot rolling final compounding is carried out, and the high-performance titanium/steel bimetallic composite plate is obtained. The method is low inequipment requirement, short in process flow, high in production efficiency and low in production cost. The interface bonding strength of the prepared titanium/steel bimetallic composite plate is larger than 230 MPa, the area bonding rate is 100%, and the method is particularly suitable for preparation of high-performance thin titanium/steel bimetallic composite plates or thin-titanium-layer titanium/steel bimetallic composite plates.

The invention relates to the field of material-surface modification, particularly to a special material for stainless steel substrates composite coating for a thin valve plate and a preparation method of the special material. According to the special material for the stainless steel substrate composite coating for the thin valve plate, stainless steel metal powder is used as a composite coating bonding phase, and the wear resistance is improved through the introduction of hard-phase particles, wherein the stainless steel metal powder is 316L stainless steel powder, the hard-phase particles are WC, and the composite coating comprises the following elements in percentage by weight: 8-9% of Cr, 5-6% of Ni, 1-2% of Mo, 42-43% of W, 2-3% of C, and the balance of Fe. The wear-resistant corrosion-resistant stainless steel substrate composite coating which is disclosed by the invention, is prepared by a method based on cold spraying, the characteristic of low-temperature deposition of the cold spraying is kept, so that undesirable phenomena, such as decomposition, oxidation, phase transition, crystal grain growth and the like, of the coating material, which are caused by high-temperature deposition techniques, such as laser cladding, hot spraying and the like, are avoided.

The invention discloses a method for manufacturing a steel-copper composite kit. The method comprises the following steps of: (1) arranging an inner casting mold with selected size in an inner casting mold of a centrifugal casting machine, and fixing an end cover, wherein the inner casting mold is heated to the temperature of between 250 and 350 DEG C before installation and then the inner wall of the inner casting mold is coated with quartz powder coating of 2 to 3 millimeters; (2) quantitatively pouring molten steel into the rotating inner casting mold, wherein the revolution number of the centrifugal casting machine is determined by the following formula: n=Kr-1/2; (3) when the temperature of the inner surface of a steel sleeve prepared in the step (2) is between 1,420 and 1,500 DEG C, quantitatively pouring molten copper alloy into the steel sleeve, improving the revolution speed of the casting mold by 10 to 20 percent, and spraying water to cool the casting mold, wherein the pouring temperature of the copper alloy is controlled at 30 to 50 DEG C above a molten copper alloy phase line; and (4) controlling the thickness of a steel-copper co-melting layer by selecting the temperature of the inner surface of the steel sleeve and pouring the molten copper alloy. The method is simple in process, does not need medium machining process, and can be used for manufacturing big and small pieces.

The invention discloses a co-extrusion molding device for a wood plastic-solid wood composite material, relates to a co-extrusion molding device for a composite material, and solves the problem that a traditional wood plastic co-extrusion set is not suitable for co-extrusion of a rigid solid wood material. A co-extrusion mold is mounted on a machine head of a wood plastic extruder in a detachable manner; a solid wood conveying device and a cooling shaping device are respectively mounted at the left and right ends of the co-extrusion mold; after a solid wood quick connecting device, a solid wood conveyer, a far infrared drying machine and a glue applying device of the solid wood conveying device are connected in sequence from right to left, the glue applying device is connected with the right end of the co-extrusion mold; one end of a shaping mold of the cooling shaping device is connected with the left end of the co-extrusion mold, and the other end of the shaping mold is connected with a cooling water tank; the co-extrusion mold comprises a mold main body, a cold mold and a plurality of guide edges; the cold mold is mounted at the left end of the mold main body; and the plurality of guide edges are arranged on the inner wall of a solid wood feed main channel of the mold main body. The co-extrusion molding device is used for the co-extrusion molding of the wood plastic-solid wood composite material.

The invention relates to the technical field of metallurgy, in particular to a preparation method of an equal-thickness ultrafine grain TC4 titanium alloy plate. The preparation method comprises the steps that S1, plate blanks obtained after rolling and annealing are taken; S2, the plate blanks are grouped; S3, interfaces of the plate blanks are subjected to roughening treatment and cleaning, and then the following operation of S4 is executed on each group; S4, the plate blanks in each group are stacked into a plate layer, one side edge of each plate layer is welded, the other side edges of each plate layer are coated with anti-oxidation coatings, or all edges of the plate layers are subjected to vacuum seal welding, the hot rolling process is adopted for ply rolling and welding, final hot rolling is carried out till the thickness of the plate layers is equal to the original thickness of the plate blanks, and then air cooling is carried out; S5, if the plate layers need to be grouped again, the plate layers serve as new plate blanks to return to the step S2, and otherwise all the plate layers form a plate blank group to return to the step S3 till all the plate blanks are subjected to ply rolling into the plate; S6, the plate is subjected to heat treatment and then cooled. According to the method, the defects of the insufficient hot rolling deformation and deformation cracking and incomplete welding in the ply rolling process can be overcome, and the equal-thickness ultrafine grain plate can be prepared.

The invention relates to a carbon nanotube/ benzoxazine/ bimaleimide composite material and a preparation method thereof. By using carbon nanotube modified by hyper-branched polysiloxane as a reinforcing material and using benzoxazine modified by bimaleimide performed polymer as a matrix, a high temperature-resisting super wear-resisting self-lubricating composite material is prepared by cast molding. For raising the dispersibility of carbon nanotube in resin and the interface bonding intensity of carbon nanotube with resin, the hyper-branched polysiloxane is adopted for modifying carbon nanotube, and an active function group epoxide group which can be chemically reacted with resin is introduced into the surface. The benzoxazine modified by bimaleimide performed polymer used herein contains bisphenol A diallyl ether as an active diluent, has low viscosity, and is beneficial for dispersing graphene. Accordingly, the prepared composite material has good mechanical properties and excellent friction performance, and can be used as a slide plate of a compressor or a dynamic seal coating of an engine, etc.

The invention discloses a preparation method of CNT (carbon nanotube) microspheres. Water-insoluble resin is completely dissolved in an organic solvent, then CNTs and a surfactant are added, and a CNT-containing resin mixed solution is obtained through mixing and ultrasonic and even dispersion; the solution is slowly dropped into a container containing a microsphere forming liquid, the CNT-containing resin solution aggregates to form sphere-like bodies for precipitation in an aqueous solution under the surface tension action, CNT-containing microspheres are obtained, taken out and washed repeatedly, and the microspheres with the CNTs and resin polymer molecules penetrating through each other are obtained after drying at the room temperature. The CNT microspheres can be applied to fiber reinforced composite materials, self-healing composite materials, semiconductor device packaging materials and the like, and the dispersity of the CNTs in the composite materials is effectively improved.

The invention relates to an in-situ nano TiC ceramic particle reinforced copper based composite material and a preparation method thereof. According to the invention, an in-situ nano TiC ceramic particle reinforced copper or cooper alloy based composite material is prepared by adopting a combustion synthesis chemical reaction method and a hot-pressing technology, wherein the size of the TiC ceramic particle synthesized by an in-situ reaction is less than 100 nm, and the weight percentage of the TiC ceramic particle is 3-30. The preparation method comprises the following steps: mixing reactant powder materials in proportion and preparing a blank; evenly mixing ingredients in a drum type ball mill mortar; pressing at room temperature so as to obtain a reaction prefabricated block; heating the prefabricated block so as to initiate a combustion reaction and then immediately applying an axial pressure on the prefabricated block, and cooling the prefabricated block to room temperature along with a furnace after maintaining the pressure so as to synthesize the nano TiC ceramic particle reinforced pure cooper or copper alloy based composite material. The material provided by the invention has the main characteristics that nano TiC is generated by an in-situ mode; the surface of the ceramic particles is pure, and the interface bonding strength of the ceramic particles and the substrate is high; the distribution of the nano TiC ceramic particles in the substrate is uniform; and the contents of impurities in the substrate are less.

A polyether sulfone water-based sizing agent contains the following components by weight percent: 0.5%-2.0% of main slurry, 0.2%-2.0% of an emulsifier, 1.3%-6.0% of an organic solvent, and 90.0%-98.0% of deionized water. The polyether sulfone water-based sizing agent provided by the invention has the advantages that the interface bonding strength between polyether sulfone resin and carbon fiber can be improved, the cost is low, and the flexibility of carbon fiber after sizing is good.

The invention relates to a method for improving the inorganic/organic composite membrane performance through interface modification. In the provided method, a porous ceramic support body is soaked in a silane modifying solution, and then a polymer film-forming solution is painted on the side, which has been modified, of the inorganic ceramic support body so as to obtain the inorganic/organic composite membrane with a modified interface. The provided method can improve the selectivity of the pervaporation composite membrane, at the same time, the binding strength between the inorganic material and the organic material is enhanced at the same time, and thus the stability of the composite membrane is improved. The provided method is simple and economic, and the application range is wide.

The invention discloses a preparation method of a titanium-steel composite plate, and belongs to the field of material processing. The preparation method of the titanium-steel composite plate comprises the steps that the surfaces of adopted titanium blanks and the surface of an adopted steel blank are treated, and then the surfaces of the titanium blanks are coated with paint and dried at the roomtemperature; the two titanium blanks with the surfaces being treated and coated with paint are aligned and stacked together, the steel blank is placed between the two titanium blanks, and then the blanks are assembled together symmetrically; the periphery of a composite blank is welded and sealed, and vacuumizing treatment is conducted; and the composite blank is placed in a heating furnace so asto be subject to heat treatment, then multi-pass rolling is conducted, the composite blank is air cooled after being rolled, and edge cutting, tension-straightening and flattening are conducted. According to the preparation method of the titanium-steel composite plate, the surfaces of the titanium blanks are coated with protective coatings, so that the titanium blanks are protected, the situationthat the composite performance is affected due to the fact that titanium with active chemical properties is oxidized and forms compounds with other elements is avoided, and the coatings are preparedfrom isolation paint which can prevent oxidization of titanium and prevent diffusion of harmful elements (such as C and N) at high temperatures.

The invention discloses a boron carbide composite material and a preparation method thereof. The boron carbide composite material is characterized by being prepared from the following components in percentage by mass: 30 to 60 percent of boron carbide powder, 5 to 25 percent of carbon dust, 10 to 25 percent of silicon powder and 15 to 45 percent of metal powder. The preparation method comprises the following steps: weighing the components according to corresponding proportions, taking out part of powder from the metal powder according to the demand for later use, and mixing remaining metal powder with other powder to obtain ceramic-metal mixed powder; respectively carrying out layer-by-layer sintering on the metal powder and the ceramic-metal mixed powder by adopting a directional energy field, and repeating the sintering process until material additive manufacturing is finished, wherein the atmosphere in the whole manufacturing process is a protective atmosphere such as vacuum atmosphere or argon atmosphere. The boron carbide composite material prepared by the preparation method disclosed by the invention is of a laminated structure, has the characteristics of high obdurability, good radiation resistance, low density, high reliability and the like, and can be widely used as a high-performance frictional material, an armored protection material, a storage material of a nuclear reactor spent fuel and the like.

The invention relates to an NbTi/TiNi memory alloy composite material and a preparation method thereof. The memory alloy composite material comprises the following components calculated by the total weight of the memory alloy composite material: Nb element with the atomic percentage of 18-22%, and Ti element and Ni element with the atomic rate of 0.3: 1-1.5: 1, wherein the sum of the atomic percentage of the three elements of Ti, Ni and Nb is 100%. The memory alloy composite material has the special functional features of high yield strength, strain soft mode, linear super-elasticity, double-stress platform and the like. The invention further relates to the preparation method of the NbTi/TiNi memory alloy composite material, which comprises the following steps: selecting elementary substances of niobium, titanium and nickel with the purity of above 99.0% by weight according to the mixture ratio of the components of the NbTi/TiNi memory alloy composite material, placing the elementary substances of niobium, titanium and nickel into a smelting furnace with the vacuum degree of being higher than 10-1Pa or inert gas protection, and smelting for forming the NbTi/TiNi memory alloy composite material.

Provided is a process for producing a display apparatus, which comprises (a) a step of forming a seal part made of e.g. a double-sided adhesive tape 12 on the edge of a surface of a display device 50 (a first plate), (b) a step of supplying a liquid photocurable resin composition 14 to a region enclosed by the seal part, (c) a step of laminating, in a reduced-pressure atmosphere of not more than 100 Pa, a transparent plate 10 (a second plate) on the photocurable resin composition 14 thereby to obtain a laminated precursor having the photocurable resin composition 14 hermetically sealed, and (d) a step of curing the photocurable resin composition 14 in such a state that the laminated precursor is placed in a pressure atmosphere of not less than 50 kPa to form a resin layer.

A polyetherimide aqueous emulsion type carbon fiber sizing agent contains the following components by weight percent: 20%-35% of main slurry, 2%-7% of an emulsifier, and 58%-78% of deionized water. The polyetherimide aqueous emulsion type carbon fiber sizing agent provided by the invention has the advantages of safety and non-pollution, and the interface bonding strength between carbon fiber and special engineering plastics can be improved.

The invention discloses a preparation method of a component-gradient-controllable multi-element ultrahigh-temperature ceramic modified C/C composite material. Through multi-section design of various ultrahigh-temperature ceramics (ZrC, HfC, HfB2 and the like) and high-temperature ceramic (SiC) composite modified C/C composite materials, a ceramic phase forms a continuous component gradient distribution form in a C/C matrix, ablation resistance and oxidation resistance requirements of different temperature range fields are met regionally, and meanwhile the defect that the mechanical property isreduced due to component mutation is overcome. According to the invention, a preparation process of combining molten salt infiltration and common reaction infiltration and gradient infiltration powder configuration are adopted in sections, so that near-ablation-end strong ceramic phase interface design is realized, and ceramic phase distribution realizing that the content of an ultrahigh-temperature ceramic phase is sequentially decreased from the near ablation end to a far ablation end and the high-temperature ceramic phase is sequentially increased is regulated and controlled; finally, thegradient ceramic-based composite material with different ceramic phase components and contents in gradient change and meeting the performance requirements of the material is formed.

A pad manufacturing process applied in LED epiwafer and a new construction thereof comprising of a means to increase interfacial bonding strength being provided first to the surface of the epiwafer; followed with a metal deposition means provided to the surface of the epiwafer by having the surface processed with plasma to improve adhesion between pad and epiwafer; and plating conditions being controlled to obtain finer and more uniform grains to correct the problem of pad surface roughness in order to improve the bonding strength between pad and bonding wire. Furthermore, a new construction of epiwafer and a pad is comprised of an epiwafer containing a substrate, an epitaxial layer, and a first metal layer covering the top of the epitaxial layer; an adhesion layer covering the top of the first metal layer; and a pad covering the top of the adhesion layer in sequence.