539 results about "Interfacial bonding" patented technology

The present invention provides a method for removing or reducing the thickness of ultrathin interfacial oxides remaining at Si—Si interfaces after silicon wafer bonding. In particular, the invention provides a method for removing ultrathin interfacial oxides remaining after hydrophilic Si—Si wafer bonding to create bonded Si—Si interfaces having properties comparable to those achieved with hydrophobic bonding. Interfacial oxide layers of order of about 2 to about 3 nm are dissolved away by high temperature annealing, for example, an anneal at 1300°-1330° C. for 1-5 hours. The inventive method is used to best advantage when the Si surfaces at the bonded interface have different surface orientations, for example, when a Si surface having a (100) orientation is bonded to a Si surface having a (110) orientation. In a more general aspect of the invention, the similar annealing processes may be used to remove undesired material disposed at a bonded interface of two silicon-containing semiconductor materials. The two silicon-containing semiconductor materials may be the same or different in surface crystal orientation, microstructure (single-crystal, polycrystalline, or amorphous), and composition.

A surgical tissue adhesive composition contains at least one 1,1-disubstituted electron-deficient olefin macromer. The adhesive composition of the invention has improved biocompatibility as well as controlled biodegradation characteristics and bioactivity. Adhesive co-monomer compositions contain at least one macromer with a pendant oligomer, polymer, or peptide chain as an acrylic ester of the reactive olefin. The polymers formed therefrom have a grafted brush-like nature. The composition is particularly useful for creating an adhesive bond at the junction of living tissue in surgical applications. The adhesive composition may further comprise co-monomer, co-macromer, cross-linker, or inter-penetrating polymer compounds containing peptide sequences that are bioactive or enzyme responsive. The peptide sequences are selected to promote tissue infiltration and healing in a particular biological tissue. The sequences may contain specific cell-adhesion, cell-signaling, and enzyme-cleavable domains. Furthermore, a degradable filler material may be included in the composition to create a reinforced composite. The filler preferably has a higher degradation rate than the polymer matrix, generating porosity upon degradation. The adhesive may further contain entrapped or incorporated drugs or biologics, including antibiotics or growth factors. The adhesive can be used to bind together the edges of living tissues during surgical procedures. The cured composition provides interfacial bonding and mechanical fixation while promoting tissue infiltration and replacement of the adhesive polymer.

The invention discloses a preparation method of a polyvinylidene fluoride hollow fiber composite microporous membrane which has strong interfacial bonding force. The preparation method comprises the following steps: 1) neutral or amphiphilic substances which have good bonding force with braided fiber tubes and the polyvinylidene fluoride are prepared into dilute solution; 2) the dilute solution of the neutral or amphiphilic substances is coated once on the braided fiber tubes; 3) casting membrane liquid is used for secondary coating on the coated braided fiber tubes, and the polyvinylidene fluoride hollow fiber composite membrane is obtained by a solution phase transition method; 4) post-hydrophilization treatment is carried out; 5) the polyvinylidene fluoride hollow fiber composite membrane is cleaned and dried to obtain the hydrophilic polyvinylidene fluoride hollow fiber composite microporous membrane. The preparation method takes the braided fiber tubes as supporting tubes, uses an amphiphilic copolymer and the polyvinylidene fluoride to be blended, and prepares the polyvinylidene fluoride hollow fiber composite microporous membrane which has strong interfacial bonding force, hydrophilicity, pollution resistance, large flux, high interception rate and high mechanical strength by the solution phase transition method.

The invention discloses a phased-array ultrasonic detection method for interfacial de-bonding of a composite material. The method comprises the following steps: (1) sequentially triggering each wafer of a phased-array probe to generate ultrasonic signals, superposing the ultrasonic signals, propagating the ultrasonic signals inside the composite material, and reflecting the ultrasonic signals during the interface de-bonding or interfacial de-bonding of the composite material; (2) superposing the reflected ultrasonic signals, receiving the ultrasonic signals by using the phased-array probe, performing data processing, and then outputting a phased-array scanning image through a phased-array display instrument; (3) comparing an ultrasonic detection image during the good interfacial bonding of the composite material with an ultrasonic detection image during the interfacial de-bonding of the composite material to judge whether the composite material has a de-bonding defect. The method has the advantages of high detection accuracy, simple operation process and the like.

The invention discloses a refractory and thermal-insulating spray coating material, and a preparation method and an application thereof. The refractory and thermal-insulating spray coating material comprises two parts, namely a prefabricated slurry and a curing agent, wherein the prefabricated slurry is prepared with a refractory aggregate and a binder; the weight of the refractory aggregate is 60-63 percent of the total weight of the refractory and thermal-insulating spray coating material; the weight of the binder is 34-37 percent of the total weight of the refractory and thermal-insulating spray coating material; and the weight of the curing agent is 3-6 percent of the total weight of the refractory and thermal-insulating spray coating material. According to the preparation method, the refractory and thermal-insulating spray coating material is prepared by evenly mixing the weighed refractory aggregate, the weighed binder and the weighed curing agent in sequence. A large-aperture spray gun for spraying coarse sand is adopted for quickly spraying the uniformly stirred slurry onto the surface of the inner wall of a furnace lining to prevent the slurry from being cured due to long-term storage, and then the refractory and thermal-insulating spray coating material is put into production directly. The refractory and thermal-insulating spray coating material has high interfacial bonding strength with the furnace lining, high resistance against furnace gas erosion, excellent thermal shock stability and high infrared radiance.

The utility model discloses a PVC modified material and a preparation method thereof; the PVC modified material consists of components with the following weight portions: 100 portions of PVC, 2 portions to 100 portions of SAN, 0.2 portion to 30 portions of compatibilizer, 1 portion to 10 portions of processing modifier, 5 portions to 80 portions of inorganic filler, 0 portion to 10 portions of heat stabilizer, 0 portion to 10 portions of lubricant, 0 portion to 10 portions of anti-oxidant, and 0 portion to 5 portions of foaming agent. In the utility model, the SAN is adopted as the modifying component and maleic anhydride multipolymer is added as the compatibilizer to modify the PVC. The SAN has quite high heat resistant deformation temperature; the maleic anhydride multipolymer compatibilizer can effectively improve the interfacial bonding force between matrix resin and the inorganic filler, so as to further improve the deformation resistant capability of the material. The molecular structures of the SAN and the compatibilizer are not provided with unsaturated double bonds, have not significant impact on the weatherproof performance of the PVC blending modified material and are suitable to be used on occasions with requirement for the weatherproof performance. The prepared PVC modified material has obviously improved weatherproof performance, is excellent in weatherproof and low in cost.

The present invention relates to a flexible unbonded pipe comprising an inner liner capable of forming a barrier against outflow of a fluid which is conveyed through the pipe, and one or more armouring layers on the outer side of the inner line. The flexible unbonded pipe comprises at least one polymer layer and one film layer, said polymer layer being bonded to said film layer. The film layer may preferably be a metal film layer, such as aluminum film, stainless steel film or duplex film. The polymer layer may preferably be cross-linked polyethylene. The interfacial bonding between the polymer layer and the film layer should preferably be sufficiently strong to prevent creation of gas pockets between the layers when subjected to an increased pressure of aggressive fluids (hydrogen, sulphides, methane and carbon dioxide) on the film side of the pipe. Thereby, it is possible to protect armour layer(s) from aggressive fluids.

A process for preparing a completely delaminated graphene oxide/rubber nanocomposite. The process combines emulsion compounding with flocculation or spray drying, retains the morphology of graphene oxide/rubber composite in a liquid state, and achieves highly dispersed and highly delaminated morphology dispersed on nano scale. Furthermore, a substance able to produce ionic bonding or chemical bonding with the surface functional groups of graphene oxide is added to graphene oxide/hydrosol, as a surfactant, thus the interfacial bonding between graphene oxide and the rubber is increased. The composite is subjected to subsequent compounding and vulcanization to prepare a vulcanizate with dynamic performance, such as a high tensile strength, stress at a definite elongation, tearing strength, etc.

A pantograph slide composite material and a preparation method thereof relate to a copper-based pantograph slide composite material and a preparation method thereof. The invention solves the problems of poor interfacial wettability and low interfacial bonding strength between a ceramic reinforced phase and coppor in existing copper-based pantograph slide composite materials. The composite material of the invention is prepared by copper powder and ceramic particles, wherein the surface of the ceramic particle has a chemical copper plate layer. A mixed material is obtained by mixing the ceramic particles with chemical copper plate layers on the surfaces and the copper powder, and then the mixed material is processed by a hot-pressing sintering process or a combined process of hot-pressing sintering and hot extrusion. The Ti3AlC2 ceramic particles inside the composite material have uniform distribution, high structure density, good interfacial bonding performance, and good mechanical properties; the density is up to 99.86%-100.79%; the hardness is up to 92.3-93.3 HB; the tensile strength is up to 230-300 MPa; and the friction coefficient is 0.15-0.4.

The invention discloses a method for testing the interfacial bonding strength of a ceramic fiber-reinforced resin matrix composite material and relates to ceramic fibers. The method comprises the following steps: bonding the ceramic fibers to a hard paper frame by virtue of an instant adhesive, for straightening and solidifying the ceramic fibers; preparing an embedding mold, putting the ceramic fibers and the hard paper frame into the embedding mold, and introducing resin into the embedding mold; after the resin is solidified, cutting an embedded end together with the embedding mold so as to obtain a sample, and polishing; when the embedding depth of the sample is lower than 1mm, bonding the embedded end with a primary cut part by virtue of quick-dry resin after the polishing process; burning out two sides of the paper frame at an un-embedded end by virtue of naked flame, averagely cutting the upper end of the paper frame according to the quantity of the ceramic fibers, and bonding and reinforcing the paper frame by virtue of a hard paperboard with area equal to that of the cut paper frame; firstly fixing the embedded end at a lower clamp of a testing machine, and then fixing a reinforcing section to an upper clamp of the testing machine; carrying out a single-filament draw-out experiment; recording each withdrawal force value given by a testing machine; observing the shape of an withdrawn end, and measuring the maximal withdrawing length of the single fiber; and calculating the interfacial bonding strength between the fiber and the resin.

A splittable/peelable tubular body (2) of a catheter or sheath wherein the tubular body (2) has a splittable/peelable atraumatic tip (14) is disclosed. The atraumatic tip (4) is generally softer than the tubular body (2). The tubular body (2) and atraumatic tip (4) each comprise a peel mechanism longitudinally extending along their respective lengths. The peel mechanisms are formed by longitudinally extending regions of interfacial bonding (11) between first and second longitudinally extending strips (8, 10) of polymer material. Each strip (8, 10) forms at least a portion of an outer circumferential surface of the tubular body (2) and atraumatic tip (4). A region of stress concentration extends along the region of interfacial bonding. The stress concentration facilitates the splitting of the tubular body (2) and atraumatic tip (4) along their respective peel mechanisms.

The invention discloses a recovery method of a carbon-fiber reinforced resin-base composite material with pretreatment modes, which is characterized by comprising the following steps: carrying out heat-moisture treatment, loop speed-up aging treatment or water-jet impact treatment on a carbon-fiber reinforced resin-base composite material, and carrying out supercritical reaction to obtain high-performance carbon fibers, thereby implementing recovery of the carbon-fiber reinforced resin-base composite material. The heat-moisture treatment and loop speed-up aging treatment in the method enable the interfacial structure of the material to generate new pores and cracks, so that the resin base generates the phenomena of swelling and plasticizing, the pore size in the resin base is increased, and a small amount of resin base is stripped from the carbon fibers; the water-jet impact treatment mode can lower the interfacial bonding property of the material and previously destroy the structure of the resin base; all the three modes can enhance the mass diffusion of the supercritical fluid in the resin base, accelerate the degradation of the resin base in the supercritical fluid environment and enhance the recovery efficiency of the carbon fibers.

The invention discloses a SiC-TaC coating/matrix collaborative modified C/C composite material and its preparation method. The composite material provided by the invention comprises two parts. The portion below the surface of the C/C composite material is the matrix modified portion with the thickness being 0.1-10mm. In addition, carbide in the C/C composite material emerges in gradient distribution. The portion which is deposited on the surface of a carbon material is a coating portion with the thickness being 10-300 microns. The preparation method of the composite material comprises the following steps of: cutting a C/C green body at the density of 0.80g/cm<3>-1.60g/cm<3> into an annular shape or a plate shape, followed by ultrasonic cleaning and drying, placing into a multifunctional CVD furnace, depositing carbide on the surface layer and surface of the C/C green body by controlling deposition parameters, further densifying the green body by the use of pyrolytic carbon so as to obtain the high-density coating/matrix collaborative modified C/C composite material. The main advantages of the invention are as follows: by the penetration of carbide through the surface layer of the C/C composite material, the thermal expansion coefficient of the matrix is raised, the interfacial bonding state is improved, a continuous transition of carbide is formed between the coating and the matrix, and the metallurgical bonding is accomplished between the coating and the matrix.

The invention relates to a method for reinforcing toughening a resin matrix composite material by nano-fiber, which belongs to the composite material field. The invention is characterized in that polymers of different molecular weight with the designed solubility parameter ratio ranging from 0.8 to 1.2 and the molecular weight above 2:1 are selected as core and shell structure high polymers; by using traditional electrostatic spinning, namely the uniaxial method, shell-core structure nano-fiber is prepared; then the shell-core structure nano-fiber is composited and cured with the resin matrix by the layer paving or mixing process so as to prepare a composite material; the polymers of the shell structure part can be dissolved or mutually reacted with the molecular part of the resin matrix; and finally the three-dimensional network chain of the cured composite material can be mutually entangled or reacted with the molecular chain of the shell structure polymer, thereby greatly improving the interfacial property of the composite material. Compared with traditional nano-fiber composite materials, the interfacial bonding of the nano-fiber and the resin matrix is good; and mechanical property of the resin matrix composite material can be significantly enhanced under smaller content of nano-fiber.

The invention relates to preparation method of rubber/ halloysite nanotube nano-composite material, the invention adopts the preparation method that the rubber, the halloysite nanotube and modifying agent are mixed according to the mass ratio of 100:5 to 100 : 0.5-20 through the ordinary rubber pugging equipment and technique, then the sulphation is performed through the ordinary sulphidizing process and equipment to realize the in-situ modification, and finally, the rubber/ halloysite nanotube nano-composite material with nano-dispersion, good interfacial bonding and good performance. Wherein, the modifying agent comprises compound in-situ generated phenolic resin, alkyl phenolic resin, modified rubber, methacrylic acid metal salt and one or more than one mixture (s) in the sulfur-containing organosilane coupling agent. The preparation method of rubber/ halloysite nanotube nano-composite material has the advantages that the defects that the rubber/ halloysite nanotube nano-composite material is difficult to be dispersed, the interfacial bonding is not good, the performance can not be improved observably can be overcome, and the preparation method can be applied in a variety of rubber products, rubber toughening plastics and binding agents and the like.

The invention belongs to the field of rapid manufacturing and discloses an integrated forming method of multi-material part adopting a gradient lattice structure. The method comprises steps as follows: (1) preparation of aluminum-based composite powder suitable for SLM forming: aluminum alloy powder and enhanceosome particles are mixed in various mass ratios, and then, each part of the aluminum-based composite powder is subjected to ball milling; (2) an aluminum substrate is fixed on a forming table board of SLM equipment to be preheated; (3) part forming: aluminum-based composite powder in different ratios is replaced for forming an upper layer, and the multi-material part adopting the gradient lattice structure and having continuously changing structures and ingredients is manufactured;(4) the part is cooled and subjected to linear cutting, and the part adopting the gradient lattice structure is obtained. The aluminum-based composite powder is uniformly distributed and has good interfacial bonding properties, the problem that interfaces of metal and ceramic are not matched is well solved, suddenly changed interfaces are eliminated, sudden change of physical performance due to the suddenly changed interfaces is eliminated, and heat stress is reduced.

The invention discloses a silicified diamond/SiC composite material preparation method, which belongs to the field of electronic packaging materials. Diamond particles and silicon powder are firstly subjected to wet mixing, sintering is carried out after thorough grinding, the diamond surface and the silicon powder react, and a layer of silicon carbide coating is generated; then, the diamond particles with the surface coated with the silicon carbide and the silicon powder are mixed, an organic binder is added at the same time, grinding is carried out, mixing on a mixer is carried out, and uniform composite particles are obtained; the composite particles are subjected to prepressing and debinding and are transferred to a vacuum infiltration furnace, a silicon burial method is adopted for vacuum infiltration, and a compact diamond/SiC composite material is prepared. The silicon powder is adopted to modify the diamond particles, the interfacial bonding between diamond and silicon is improved, the compactness of the obtained diamond/SiC composite material is more than 95%, the hardness is above HRA 80, the bending strength exceeds 200 MPa, the thermal conductivity reaches 600 W/mK, andthe thermal expansion coefficient 1.5 to 4*10<-6>/K. Thus, multiple products with complex characters, complex curvature and large size can be prepared at one time, the production efficiency is high,and the cost is low.

The invention discloses a liner material for improving interfacial bonding of an HTPB propellant and a preparation method thereof. The liner material provided by the invention comprises two parts, namely an interpenetrating polymer network I and an interpenetrating polymer network II, wherein the interpenetrating polymer network I comprises a curing agent of isocyanate, a chain extender of dihydric alcohol or diamine, a cross-linking agent of a multiple active functional group compound and a plasticizer, and also comprises adhesives comprising hydroxyl-terminated polybutadiene, nitrine or polyether and other hydroxyl-terminated macromolecule dihydric alcohols. The interpenetrating polymer network II comprises an epoxy resin, polyacrylate, polyurethane, polysiloxane, a vinyl ester resin and other resins. According to the invention, a novel technology can be provided to adapt to a propellant liner, so that the interfacial bonding property between the liner and the propellant is improved.

A drawn glass-coated metallic member has a thermal contraction coefficient differential such that the thermal contraction coefficient of the glass is less than that of the metallic member. The thermal contraction coefficient differential is maintained within a predetermined range during drawing. The glass is placed under residual compression, interfacial bonding between said glass and said wire is substantially uniform, and surface cracking and bond breaks between metal and glass are substantially prevented. A dynamic balance is maintained between the surface tension of the molten alloy and the resistance to high temperature deformation by the glass vessel in which it is contained, enabling the production of glass-coated amorphous or nanocrystalline alloy members having predefined cross-sectional shapes.

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.

Two-component polymer composite structures are described, such as a composite structure that includes a first polymer structure and a second polymer structure adhered to one another through interfacial adhesion provided by a semicrystalline random copolymer with 70-88 mole % propylene units and alpha olefin units having 2 or from 4 to 10 carbon atoms, the semicrystalline random copolymer having a heat of fusion of from 2 to 90 J/g and a crystallinity of from 2% to 65% of the crystallinity of isotatic polypropylene.