34results about How to "Improve mechanical bond strength" patented technology

A wiring board in which lower-layer wiring composed of a wiring body and an etching barrier layer is formed in a concave portion formed on one face of a board-insulating film, upper-layer wiring is formed on the other face of the board-insulating film, and the upper-layer wiring and the wiring body of the lower-layer wiring are connected to each other through a via hole formed in the board-insulating film. The via hole is barrel-shaped, bell-shaped, or bellows-shaped.

The invention discloses low-melting-point metal-CNTS / Cu water-based conductive composite slurry. The low-melting-point metal-CNTS / Cu water-based conductive composite slurry comprises the following components in percentage by mass: 50-80% of a mixed conductive phase, 5-15% of tin powder or bismuth powder, 15-30% of a water-based carrier, 0.1-0.5% of an additive P and 0.1-4.5% of an additive Ga, wherein the total amount is 100%. The present invention further discloses a preparation method of low-melting-point metal-CNTS / Cu water-based conductive composite slurry. In the product and the preparation method thereof, the mixed conductive phase is prepared by employing a chemical plating method, so that the combination of the copper and a carbon nano tube is more compact and uniform; the low-melting-point metal tin or bismuth is used as a new bonding phase, so that the sintering temperature can be reduced, and the comprehensive performance of the slurry is improved; and the water-based carrier is environment-friendly, so that the cost is obviously reduced.

An electronic device includes: a support member including a first terminal, a second terminal, and a support portion extending from the first terminal and coupling the first terminal with the second terminal; an electronic component; and a bonding member connecting the first terminal with the electronic component. In a plan view along a direction in which the first terminal and the electronic component overlap each other, a portion of the first terminal is adjacent to the support portion with a notch portion therebetween and protrudes toward the extending direction side of the support portion. The support portion is bent at a portion adjacent to the protruding portion of the first terminal along the overlapping direction.

The invention discloses an isothermal forging process of a TB17 titanium alloy, and belongs to the technical field of material science. The method mainly comprises the steps that (1) a titanium alloy blank is placed in an effective working area of a resistance furnace with the set heating temperature being 785-815 DEG C for heating and heat preservation, the heat preservation time is 45-125 min, and then the titanium alloy blank is heated to 850-890 DEG C along with the furnace and then subjected to heat preservation for 25-60 min; (2) after heat preservation in the step (1) is finished, a titanium alloy blank is put into a die to be subjected to isothermal forging, the deformation amount of the blank is controlled to range from 10% to 29%, and the deformation rate of the blank is controlled to range from 0.3 mm / s to 1.25 mm / s; and (3) after forging in the step (2) is completed, the blank is taken out and cooled to the room temperature at the cooling speed of 0.5 DEG C / s-35 DEG C / s. The comprehensive mechanical property of the titanium alloy forge piece treated by the isothermal forging process can be remarkably improved, and the tensile strength and fracture toughness of the forge piece are improved.

The invention discloses a preparation method of a modified carbon fiber and zirconium carbide reinforced aluminum-based composite material. The preparation method comprises the following steps: carrying out degumming, roughening, sensitization, activation and reduction pretreatment on carbon fibers with the diameter of 6-7 [mu]m and the length of 0.5-2 mm; 2, a layer of metal nickel is plated on the surface of the carbon fiber by adopting a chemical plating method to obtain a nickel-plated carbon fiber; 3, ball-milling and mixing are performed on zirconium carbide and aluminum alloy powder, and nickel-plated carbon fibers are mechanically stirred to obtain mixed powder; and 4, spark plasma sintering is performed on the mixed powder, cooled and demolded to obtain the modified carbon fiber and zirconium carbide reinforced aluminum matrix composite material. The prepared modified carbon fiber and zirconium carbide reinforced aluminum matrix composite is good in mechanical property, high in hardness and good in wear resistance.

The invention discloses a preparation method for a reinforced polyvinylidene fluoride hollow fiber membrane. The preparation method comprises the following steps of preparing a casting solution, preparing a hollow braided rope, preparing a reinforcing body, preparing a primary hollow fiber membrane body, preparing a reinforced body base membrane body and preparing the hollow fiber membrane. The method has the advantages of being simple in process and high in efficiency, meanwhile, the prepared membrane has excellent corrosion resistance, heat resistance, cold resistance, oxidation resistance and weather resistance, pollutants can be selectively blocked, irreversible deposition of the pollutants on the surface of the membrane can be prevented or reduced, and the anti-pollution performance of the membrane is improved; and the problem that the skin layer is prone to fall off in the using process of a hollow fiber membrane can be solved, a polyacrylonitrile filament which has the co-solvent characteristic with a polyvinylidene fluoride surface separation layer is adopted and is woven into hollow tubular fabric to serve as the reinforced body of the membrane, the casting solution has agood wettability on the reinforcing body and partially permeates into fiber gaps of the reinforcing body, the mechanical bonding strength is improved, the possibility of filament breaking and pollutant blockage can be lowered, and the service life of the membrane is prolonged.

The invention discloses low-melting-point SnBi alloy-copper composite electronic slurry, which comprises the following components by weight: 55-85% of mixed conductive phase, 5-15% of tin-bismuth alloy powder, 10-25% of organic carrier, and additives consisting of 0-0.5% of La and 0-4.5% of Ga, with the total percent being 100%. The invention also discloses a preparing method of the low-melting-point SnBi alloy-copper composite electronic slurry and a printing method of the low-melting-point SnBi alloy-copper composite electronic slurry. The low-melting-point SnBi alloy-copper composite electronic slurry and the preparing and printing applications thereof have the advantages of simple process route, easy availability of raw materials, low production cost, no lead and cadmium components, and no pollution.

The invention discloses a brake pad for a high-speed train. The brake pad comprises a brake pad steel backing and a friction block; the friction block comprises a friction block steel backing, a pressing blank and a reinforcing pin; a blind hole is formed in the pressing blank; a through hole communicated with the blind hole is formed in the friction block steel backing; the two ends of the reinforcing pin are fixedly clamped in the blind hole and the through hole respectively, the pressing blank is fixedly connected with the friction block steel backing, the brake pad steel backing is fixedlyconnected with the friction block steel backing, the mechanical bonding strength of the friction block steel backing and the pressing blank is enhanced through the reinforcing pin, and the shear resistance and the impact resistance of the bonding surface between the pressing blank and the friction block steel backing are enhanced. The brake pad can be used to solve the problem that in the prior art, the shear resistance and the impact resistance of the bonding surface between the pressed blank and the friction block steel backing are weak due to the fact that pores are inevitably formed in the bonding surface between the pressing blank and the friction block steel backing.

The invention belongs to the technical field of train braking, and particularly relates to an externally-wrapped friction block for a high-speed train brake. The externally-wrapped friction block forthe high-speed train brake comprises a friction block steel back bottom plate, friction block steel back arc claws, a friction block compact blank, first through holes and second through holes. The friction block adopts the externally-wrapped structure, the friction block compact blank is buckled tightly, the firmer effect is realized, the shear resistance and the shock resistance between a friction block steel back and a bonding surface of a friction material layer are enhanced, the phenomena of falling and chipping of the friction material layer can be avoided, and thus a brake pad works more safely and reliably.

The invention discloses a mechanical bimetal composite pipe with a thickened pipe end lining layer. The mechanical bimetal composite pipe comprises a base pipe and a liner pipe assembled in the base pipe, the two ends of the base pipe both exceed the liner pipe, and the exceeding parts of the base pipe are all expanded sections. A thickening layer is arranged between the expanded sections and the liner pipe, and the inner diameter of the thickening layer is equal to that of the liner pipe. The sum of the wall thicknesses of the expanded sections and the thickening layer is greater than the sum of the wall thicknesses of the liner pipe and the base pipe. The invention further discloses a method for preparing the mechanical bimetal composite pipe with the thickened pipe end lining layer. The method comprises the steps that firstly, the mechanical bimetal composite pipe is assembled and prepared; secondly, an expanding process is designed; thirdly, a liner pipe blank is cut off and expanded, and the thickening layer is prepared; and fourthly, subsequent treatment is conducted. According to the mechanical bimetal composite pipe with the thickened pipe end lining layer and the preparation method thereof, the two ends, exceeding the liner pipe, of the base pipe in the composite pipe are arranged to be the expanded sections, the thickening layer is further arranged, thickening of the liner layer at the pipe end is achieved, and the problems that the bimetal composite pipe is large in welding technology difficulty and the quality is difficult to guarantee are solved. The preparation process is simple, the preparation efficiency is high, and cost is low.

The invention relates to a preparation method of an ultrahigh-temperature anti-scouring thermal barrier coating. The preparation method comprises the following steps: providing a high-temperature alloy matrix; depositing a metal bonding layer on the high-temperature alloy matrix; a grid bonding layer with the same components as the metal bonding layer is introduced to the metal bonding layer through the laser engraving technology or the laser coaxial powder feeding 3D printing technology, the grid bonding layer is composed of rectangular grid structures with regular shapes and protrudes out of the metal bonding layer, and the side length of each rectangular grid ranges from 100 micrometers to 900 micrometers; the height of the grid bonding layer is between 100 microns and 400 microns; and depositing a ceramic layer on the grid bonding layer. According to the preparation method of the ultrahigh-temperature anti-scouring thermal barrier coating, the continuous grid layer with the regular shape is introduced between the bonding layer and the ceramic layer, the roughness of an interface between the bonding layer and the ceramic layer is increased, the mechanical bonding strength of the interface is enhanced, and therefore the service temperature of the thermal barrier coating is increased.

The invention discloses copper coated grid-type graphene, and further discloses a preparation method of the copper coated grid-type graphene. The preparation method comprises the steps that 1, the surfaces of graphene nanosheets are desensitized and inactivated, and the graphene nanosheets are punched in a vacuum punching bin of a transmission electron microscope, so that grids are formed; 2, trisodium citrate, sodium tetraborate and EDTA are added into a copper sulfate solution, and the pH value is adjusted to obtain a main salt mixed solution; 3, a catalyst, a reducing agent and a buffer agent are added into the main salt mixed solution, and the pH value is adjusted to obtain a mixed plating solution; 4, the grid-type graphene nanosheets are placed in the mixed plating solution, then, anadditive is added, the pH value is controlled to be 10-15, magnetic stirring, ultrasonic dispersion and filtration are conducted, and the grid-type graphene nanosheets are taken out; the grid-type graphene nanosheets are washed with deionized water to be neutral, drying is conducted, and the copper coated grid-type graphene is prepared. By means of the method, the plating effect and the electrical conductivity are obviously improved.

The invention relates to a preparation method of a powder metallurgy friction material, which belongs to the technical field of friction materials. In the present invention, the bonding between copper-coated silicon carbide particles and the substrate is tight, and silicon carbide has outstanding advantages such as low density, small thermal expansion coefficient, high strength, high elastic modulus, high melting point and stable chemical properties, and can be used in high-energy braking processes. Keep the friction performance of the material stable, and its good thermal conductivity can also accelerate the conduction of friction heat on the friction surface of the material during the high-energy braking process; the present invention adopts butadiene resin and rare earth element modified epoxy resin, because rubber with low surface energy tends to Adsorbed on the surface of rare earth particles with high surface energy, this adsorption can improve the strength of rubber, and under the action of stress, it can slide on the surface of rare earth particles, redistribute the stress in the material, avoid stress concentration, and improve the modification. The mechanical properties of the resin improve the wear resistance of the powder metallurgy friction material.

The invention discloses a high-strength NiW alloy composite baseband with a cube texture and a preparation method thereof. The key points of the technical scheme of the invention are as follows: the composite baseband is formed by compositing an outer layer and a core, wherein the initial material of the outer layer of the composite baseband is a NiW alloy which is obtained by vacuum induction melting and has W atom percentage of 6-7%; the initial material of the core of the composite baseband is a NiW alloy which is obtained by vacuum induction melting and has W atom percentage of 9%. The invention also discloses the preparation method of the high-strength NiW alloy composite baseband with the cube texture. The NiW alloy composite baseband prepared by the preparation method is good in interface bonding and has strong cube texture and high mechanical strength.

The invention discloses a preparation method of a composite billet for a Cu-based alloy composite baseband. According to the Cu-based alloy initial composite billet provided by the invention, the surface layer is made of Cu-Ni alloy in which the atomic percent of Ni is 40-46% and the core layer is made of Ni-W alloy in which atomic percent of W is 9-10%. The preparation method of the Cu-based alloy initial composite billet comprises the following steps of: sand blasting the surface of the Cu-Ni alloy (marked with A) of which the atomic percent of Ni is 40-46%, wherein the Cu-Ni alloy is prepared by means of melting; placing the sand-blasted Cu-Ni alloy and the Ni-W mixed powder (marked with B) in which the atomic percent of W is 9-10% in a mold according to the sequence of A-B-A, simultaneously pressing and sintering the Cu-Ni alloy and the Ni-W mixed powder by means of discharge plasma sintering technology to obtain the composite billet, and hot pressing the composite billet to obtain the initial composite billet with large deformation before cold rolling, wherein the deformation of the first pass is 30-40%, the deformation of each subsequent pass is 3-5%, and the total deformation is 50-60%. The initial composite billet is good in interfacial bonding and can be applied to preparation of the initial billet for high-temperature coating superconductive enhanced ductile basebands.