64results about How to "Improve interface binding state" patented technology

The invention discloses a making technology of high-silafont electronic packing material, which comprises the following steps: A) preparing powder: blending industrial pure aluminum and high-pure silicon at 6-8.8:4-1.2 percentage to prepare Al-Si alloy powder; B) proceeding ball grinding disposal for Al-Si alloy powder at 5-15:1 percentage for 8-32 h; C) loading oxide alloy powder in the pure aluminum; proceeding squeezing disposal on the 300-500 ton hydrostatic machine through forward squeezing pattern; keeping temperature at 400-520 deg.c for 0.5-2 h for Al-Si alloy powder before squeezing; placing each squeezing mould in the heat stove at 10-21 squeezing rate to preheat at 200-400 deg.c; squeezing to produce the product. The invention can improve heat conductivity, airtightness and tensile strength obviously, which keeps low expansion coefficient.

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 preparation method for an alumina coat on quartz fibre surfaces, and belongs to the technical field of special functional ceramics. The preparation method comprises the following steps: respectively adding aluminum ion, nitric acid and chelating agent in solvent according to the molar ratio of 1: (0.03-0.28): (0.5-1) till all the materials are hydrolyzed to generate sediments; then, adding peptizator to carry out peptization; carrying out reflux heating and stirring for 8 to 24h at a temperature of between 50 and 100 DEG C to obtain transparent and stable Al2O3 sol; putting quartz fibre into a steeping vat of Al2O3 sol for steeping and then heating up and gradually drying the quartz fibre at a temperature of between room temperature and 80 DEG C; and finally, carrying out heat treatment at a temperature of between 450 and 850 DEG C to obtain the quartz fibre coated with the alumina coat. The preparation method is scientific, reasonable and easy to implement; moreover, the Al2O3 coat coated on the surface of the quartz fibre increases material mechanical property and reduces material brittle fracture.

The invention belongs to the field of high polymer materials and in particular relates to a degradable resin-starch-kenaf extruded plastic master batch. The degradable resin-starch-kenaf extruded plastic master batch comprises the following components by volume percent: 30%-60% of polyethylene, 0-50% of starch and 5-40% of kenaf, wherein the polyethylene is composed of low-density polyethylene and maleic anhydride modified polyethylene in the volume ratio of (0.2-5):1. The extruded composite resin (master batch) material with higher tensile strength and good processing performance is prepared by virtue of a molecular design method; the biodegradation rate is 40%-70% in the presence of aerobiont; the using performance and the processing performance of the composite material are similar to those of the polyethylene, so that the material is green and environment-friendly, and therefore, the purposes of protecting the environment, efficiently utilizing the resources and lowering the cost are achieved.

The invention discloses a preparation method of a homogeneous enhanced cellulose acetate hollow fiber membrane, and the preparation method comprises the following process steps: 1, preparation of a hollow braided tube reinforced body, to be more specific, using a 2D woven technology to prepare a cellulose acetate filament into a hollow braided tube with the diameter of 1-2mm, and using the hollow braided tube as the reinforced body; 2, preparation of a cellulose acetate membrane casting solution comprising 4-18% by mass of cellulose acetate, 2-20% by mass of a pore forming agent, 0-4% by mass of a non solvent and 58-94% by mass of a solvent; 3, preparation of the hollow fiber membrane, to be more specific, homogeneously coating the surface of the hollow braided tube with the membrane casting solution by use of a co-extrusion spinneret, then using a silk guide roller for leading to pass through the air gap of 2-20cm to immerse into a solidification bath at 10-50 DEG C for forming to obtain the hollow fiber membrane; the hollow fiber membrane has good mechanical properties and interfacial bonding state, is easy to process after being abandoned, and has the advantages of simple preparation method.

The invention relates to a method for preparing high-silicon aluminum alloy by peeling and thermal extruding through rapid-solidified powder metallurgy. The method comprises the following steps: preparing high-silicon aluminum alloy powder through an atomizing powdering method; screening the powder; selecting the high-silicon aluminum alloy powder with average particle being not greater than -150 meshes; transferring into an aluminum covered sleeve; performing air removing and opening sealing; then carrying out peeling and thermal extruding to obtain a high-silicon aluminum alloy bar; machining to remove the aluminum covered sleeve in the periphery of the high-silicon aluminum alloy bar; and performing solid solution treatment and aging treatment to obtain the finished high-silicon aluminum alloy. The high-silicon aluminum alloy material prepared by the method is small and uniform in structure, high in density which can reach 100%, and high in powder deformation, so that the powder interface combination state can be improved; the mechanical property of the alloy can be improved; the strength of the high-silicon aluminum alloy material under room temperature is not less than 450MPa, and the plasticity is not less than 1%.

The invention belongs to the technical field of new materials, in particular to a preparation process for modifying and optimizing magnesium alloy matrix and reinforcing the interphase contact surface and interface aiming at the magnesium borate crystal whisker reinforced magnesium-matrix composite material. The study proves that no obvious interface reaction occurs at the interface of the magnesium borate crystal whisker and the magnesium matrix, and the bonding strength of the interface is not high. By adopting the invention, the interface of the crystal whisker reinforced magnesium-matrix composite material reaches a better bonding state, and the performance of the magnesium borate crystal whisker reinforced magnesium-matrix composite material is improved. The preparation process comprises steps of coating the magnesium borate crystal whisker, preparing the modified magnesium borate crystal whisker prefabricated block, preparing cast composite ingot blank by a vacuum pressure infiltration method; and thermally extruding the ingot blank. The composite material comprises components of aluminium isopropoxide Al(OC3H7)3, distilled water, muriatic acid, magnesium borate crystal whisker, magnesium and the balance of magnesium alloy.

The invention discloses an enhanced TiNi layered composite material and a preparation method thereof, and belongs to the field of processing of special material composite technology. By aiming at theproblems of poor mechanical properties of the existing Ti/Ni layered composite material, pure titanium and pure nickel are used as raw materials; titanium plates and pure nickel plates are respectively subjected to surface pretreatment; then, the placement is performed in an alternate laminated sequence in a mode of Ti/Ni/Ti; through the subsequent rolling compounding and heat treatment processes,the Ti/Ni layered composite material with excellent mechanical property is prepared. The preparation process is simple; the cost is low; the mechanical property is excellent.

The invention provides a copper-plated graphite film reinforced copper-based laminated block composite material and a preparation method thereof. The composite material is the laminated block composite material composed of a copper-plated graphite film and a copper foil. The preparation method of the copper-plated graphite film adopts improved electroless plating to obtain a coating with good bonding and being controllable and uniform and clean; and the preparation method of the composite material adopts vacuum hot pressing sintering, so that requirements on equipment are low, and the operation is simple. The thermal conductivity of the composite material prepared by the preparation method exceeds 1000 W/(m.K), a coefficient of thermal expansion can be lower than 10 ppm/K, and the composite material is a promising thermal management material with both bending strength and advantages of metal materials and graphite materials.

The invention discloses a zinc oxide coating-hydroxyapatite coating with biological activity and antibacterial property as well as a preparation method and an application thereof. The zinc oxide coating-hydroxyapatite coating comprises an alkaline zinc oxide coating and a hydroxyapatite coating, the alkaline zinc oxide coating is excited by ultraviolet light to generate .OH on the surface to form a zinc oxide coating-hydroxyapatite coating with the hydroxyapatite coating; and the preparation method comprises the following steps: exciting the surface of the alkaline zinc oxide coating to generate. OH, and reacting with SBF simulated body fluid to form the zinc oxide coating-hydroxyapatite coating. The zinc oxide coating-hydroxyapatite coating is used for preparing an orthopedic implant. The method is low in cost, high in efficiency, simple and easy to implement and environmentally friendly, and the zinc oxide coating-hydroxyapatite coating prepared through the method has good biological activity and antibacterial performance and has high commercial popularization value.

The invention discloses a CrAlN thermal insulation coating for an aluminum alloy piston combustor surface and a preparation method thereof. The CrAlN thermal insulation coating comprises a transitionlayer and a thermal insulation layer from the inside out in order, the transition layer is a CrAl coating, and the thermal insulation layer is a CrAlN coating. The method adopts filtered cathodic vacuum arc technique, takes a CrAl alloy target material (Cr, Al metal target) as the cathode, performs deposition of the CrAl coating on the aluminum alloy surface to form a transition layer, then uses nitrogen as the working gas, and coats the transition layer surface with the CrAlN coating evenly to form the thermal insulation layer. The CrAlN thermal insulation coating provided by the invention not only solves the problem of poor binding force and bearing ability caused by large difference of basic physical properties between the CrAlN coating and the aluminum alloy substrate material, also the coating is uniform and compact, has good film-substrate combination state and hardness up to 40GPa, and shows good high temperature thermal insulation properties and thermal shock resistance in piston thermal load test. The CrAlN thermal insulation coating provided by the invention significantly improves the performance reliability and service life of the aluminum alloy piston, and can meet thehigh power and low emission development requirements of modern engines.