57results about How to "Improve mechanical bonding" patented technology

The invention discloses a gluing method for a wood veneer. The wood veneer which is manually punched is used as a basic constitution unit and a to-be-glued object. The wood veneer is subjected to random or regular punching treatment along the thickness direction of the veneer by adopting the mechanical methods of drilling and punching or physical methods of laser drilling and microwave drilling, and the size, shape, depth and number of holes are not limited. The wood veneer which is subjected to punching is glued, the adjacent glue layers are connected together to form a three-dimensional reticular-layered glue layer composite structure, mechanical rivet force is formed, and the gluing strength is accordingly improved. Glue liquid penetrates into the wood veneer via the periphery of manually holes, and the body strength of the wood veneer is strengthened. A manufacturing method of the wood veneer comprises the following steps of (1) veneer manufacturing; (2) veneer drying; (3) veneer glue application; (4) assembly; (5) gluing; and (6) post treatment. The wood veneer manufactured by the gluing method has the characteristics of high gluing strength, good water resistance, high compressive strength and good size stability.

The invention discloses a magnesium alloy implant composite material and a preparation method and application thereof. The magnesium alloy implant composite material is prepared by the following steps of: by taking a model manufactured from magnesium alloy powder through 3D printing as a magnesium alloy implant substrate, forming a micro-arc oxidation layer on the surface of the magnesium alloy implant substrate through a micro-arc oxidation method; then forming a hydroxyapatite layer or a hydroxyfluorapatite layer on the surface of the micro-arc oxidation layer by means of an electrochemical deposition method; and finally, immersing the surface of the hydroxyapatite layer or the hydroxyfluorapatite layer to form a polylactic acid layer. According to the material provided by the invention, individual development of the magnesium alloy implant material is realized from data acquisition of an original damaged bone structure to preparation of a final multi-coating composite material, so that the high quality magnesium alloy implant composite material is obtained. A polarizing test shows that the anti-corrosive property of the material can be enhanced by four orders of magnitudes, and osteoblast cultivation shows that the magnesium alloy composite material has a better osteocyte promoting ability.

The invention discloses a preparation method of a titanium-dioxide-modified carbon-fiber-reinforced resin-base composite material. The preparation method comprises the following steps: pretreating carbon fibers with concentrated nitric acid under certain conditions, and carrying out hydrothermal reaction on the pretreated carbon fibers and a titanium source in a water solution using concentrated hydrochloric acid as an acidic medium; and after the reaction finishes, sufficiently washing the modified fibers, drying, and preparing the reinforced resin-base composite material by using the modified carbon fibers as reinforcing fibers. The tensile strength of the modified carbon-fiber-reinforced resin-base composite material is enhanced by 134.8-153.1%; the porosity is reduced from 45.7-40.5% to 19.3%-15.6%; the pore size distribution is uniform; and the friction factor of the reinforced resin-base composite material is kept at 0.12-0.14, and the abrasion loss is lowered by 37.1-50.3%, thereby sufficiently embodying the excellent friction reduction action of the modified carbon fibers applied to a wet friction material.

A method for improving field emission performance of a carbon nano tube film in the technical field of nano materials comprises the following steps: plating a metal thin film on a plane substrate; depositing the carbon nano tube film on the metal film; carrying out ultrasound nano welding on the metal film and the carbon nano tube film, thus obtaining the carbon nano tube film with improved field emission performance. The method of the invention forms excellent mechanical and electric contact between the carbon nano tube film and the metal film, thus obtaining a field emission component with low starting electric field, large emission current density and good current stability.

The invention discloses a hydrogel fiber based on luminescent MOFs, a preparation method therefor and a sensing device. The preparation method comprises the following steps of: uniformly mixing MOFs microcrystal grains into hydrogel precursors; injecting the hydrogel precursors into a coaxial double barrel; extruding a core-package structure cylinder with suitable size from the outlet of the barrel by an extrusion method or a biomaterial 3D printer; inserting one end of a common quartz fiber coaxially into the side core layer of the core-package structure cylinder; and obtaining the hydrogel fiber with a common fiber pigtail after curing. The sensing device comprises an excitation light source, a Y-type fiber, a delay fiber, a fiber connection, a hydrogel fiber, a long pass filter, a fluorescence spectrometer, and a signal processing unit. According to the overall technical scheme, high-selectivity fluorescence sensing of all-fiber can be constructed and realized, and in situ, real-time, remote and even living body fluorescence detection and sensing are realized, and the sensing applicability of the luminescent MOFs material is improved.

The invention discloses a thermoplastic composite pipe with a sealing and buckling joint, and a manufacturing method. The thermoplastic composite pipe comprises a buckling joint comprising a core pipe, and the outer diameter of the right side of the core pipe is smaller than the outer diameter of the left side of the core pipe; the right outer wall of the core pipe is sheathed with a casing, and the inner wall of the sleeve is provided with a sawtooth groove; the outer wall of the core pipe is provided with a sawtooth groove, and an assembly cavity is formed between the inner wall of the casing and the outer wall of the core pipe, and fit to the wall size of the composite pipe on the right side of the buckling joint; and the outer wall of the sawtooth groove in the outer wall of the core pipe and the inner wall of the sawtooth groove in the inner wall of the casing are both provided with shape memory alloy rings of which the outer walls are fit to the composite pipe, so that the mechanical binding force between the metal core pipe or the casing and the composite pipe is improved effectively, and the purpose of improving the sealing performance of the buckling joint is achieved. Themethod is simple and effective, and high in manufacturing efficiency, and additional energy consumption is not required.

The invention discloses a conductive composite material and a preparation method thereof, and a preparation method for a conductive line. The conductive material comprises a substrate, and metal particles uniformly dispersed in the substrate, the diameter of the metal particles is from 100 nm to 10 <mu>m, the substrate is polymer resin, and the metal particles are metal particles with three-dimensional fractal layered structures. The conductive material is used for laser etching, the micro-nano metal particles with the three-dimensional fractal layered structures are employed as the conductive filling material, the unique geometric shapes of the metal particles are employed so that ablation occurs more easily under the effect of laser compared with conventional filling material particles, and finer wiring effect can be realized under low laser power; the same conductivity is reached by adopting less metal particles than the conventional filling material particles so that the required laser etching energy is less; and the content of the metal particles is less so that the bonding force in conductive slurry and the bonding force between the conductive slurry and a matched insulation substrate can be both greatly increased.

Provided is a metal terminal block adapted for surface mounting, which includes a metal body having a three-dimensional shape, an outer surface of which includes at least one portion appropriate for vacuum pickup. The metal terminal block provided on a reel carrier through taping is picked up through the vacuum pickup on the portion of the outer surface of the metal body and is mounted on a conductive pattern of a circuit board through the surface mounting. A back surface of the metal terminal block is adhered to the conductive pattern through reflow soldering. The metal body has an insertion recess extending from a surface to an opposite surface thereto, or an insertion hole passing through a surface to an opposite surface thereto.

The invention discloses a multifunctional surface enhanced Raman substrate material, and a preparation method and an application thereof. The material is formed by combining a nylon filter membrane and nano-silver embedded into micropores of the nylon filter membrane. The preparation method comprises the following steps: (1) preparing AgNPs suspension liquid; (2) pretreating the nylon filter membrane: firstly carrying out pretreatment by using oxygen, and then carrying out cleaning by using plasmas; (3) preparing a multifunctional surface enhanced Raman substrate: carrying out solid-liquid separation on the AgNPs suspension liquid prepared in the step (1) in a vacuum suction filtration mode through the nylon filter membrane obtained in the step (2), then taking out the nylon filter membrane embedded with AgNPs, and carrying out air drying. The vacuum suction filtration method is adopted; the packaging performance is good, the stability is improved; the substrate distribution is uniform; the sensitivity is high; the signal consistency is good; the nylon filter membrane is adopted as a carrying material; the anti-friction performance is achieved; the material can be repeatedly used;the cost is low; and the preparation process is simple. Meanwhile, the multi-appearance and multi-function design is also suitable for practical application in the POCT field.

A polymeric foam article has at least two thermoplastic polymer foams in layered orientation, each of the thermoplastic polymer foams having an adjoining surface that contains a polymer skin, a thickness dimension perpendicular to the adjoining surface, perforations that are less than one millimeter in diameter that penetrate through the adjoining surface to a depth less than the thickness dimension of the foam, where the adjoining surface of one thermoplastic polymer foam is adjacent and adhered to the adjoining surface of another thermoplastic polymer foam with an adhesive thereby affixing the thermoplastic polymer foams to one another.

The invention provides an abrasion-resistant and ultraviolet-aging-resistant epoxy composite material and a preparation method thereof. The abrasion-resistant and ultraviolet-aging-resistant epoxy composite material is prepared from the materials of an epoxy resin matrix material and a TiO2 / Ti3C2 nano-composite material uniformly dispersed in the epoxy resin matrix material, wherein the TiO2 / Ti3C2nano-composite material accounts for 0.1-3 wt% of the epoxy resin matrix material, and the epoxy composite material is obtained by curing the TiO2 / Ti3C2 nano-composite material and epoxy resin in thepresence of a quaternary ammonium salt. The preparation method of the epoxy composite material is simple, and raw materials are easily available. The abrasion-resistant and ultraviolet-aging-resistant epoxy composite material prepared by the preparation method has a lower abrasion rate than ordinary epoxy materials, and meanwhile the ultraviolet-aging resistance is excellent, the tensile strengthis further improved to a certain extent, and the abrasion-resistant and ultraviolet-aging-resistant epoxy composite material is particularly suitable for being used in abrasion-resistant devices, such as the manufacture of abrasion-resistant automotive parts and abrasion-resistant sports equipment.

The invention discloses a preparation method for a silicon carbide fiber bundle enhanced aluminum matrix composite. Quartz fiber bundles are adopted to be woven into fiber cloths, the fiber cloths and graphite powder are pressed in a layered mode to form silicon carbide fiber cloths, aluminum or an aluminum alloy foil and the silicon carbide fiber cloths are subjected to layered alternate overlapping, a prefab before composite pressing and sintering is obtained, the prefab is subjected to pressing, sintering and cooling, and a filament silicon carbide fiber bundle net-shaped enhanced aluminum matrix composite is obtained. The volume fraction of silicon carbide fiber in the prepared silicon carbide fiber bundle net-shaped enhanced aluminum matrix composite is 50-60%. The compactness of the composite is 95.5-98.7%, the density is 2.80-2.90 g / cm<3>, the anti-bending elasticity modulus is 109-136 Gpa, the heat conductivity of the composite is high and not less than 170 W / (m.K), and the coefficient of thermal expansion is (8.5-12.5)x10<-6> / K and adjustable. Compared with a current used aluminum silicon carbide composite, the heat conductivity is high, the volume fraction of an enhancesome SiC is large, and the cost of the silicon carbide fiber bundle enhanced aluminum matrix composite is lower than the cost of an aluminum diamond composite.

The invention relates to the technical field of tie rod forming. The forming method of the composite pull rod comprises step A, preparation of winding forming mold and positioning of metal joints; design and preparation of winding forming mold, and engraved lines are designed on the outer surface of the winding forming mold in the circumferential direction; step B, winding of dry fiber yarn; Fiber winding equipment is used to wind according to the winding law; step C, resin infusion molding of the tie rod; after the tie rod is wound and formed with dry fiber yarn, it is placed in the resin infusion mold together with the winding molding mold, and then the resin material is poured, and the resin infusion mold is placed Heating and curing in an oven, curing and demoulding to obtain a semi-finished product; step D, processing the tie rod; processing the length of the tie rod and internal thread along the position of the metal joint of the tie rod. The composite pull rod includes metal joints, dry fiber yarns, and a cured integrally formed structure of resin materials; it solves the problems of existing tie rods that are prone to failure connection at the joint position and insufficient structural strength.