75results about How to "Stop crack" patented technology

The invention relates to a preparation process and a device of a nano-particle reinforced bimetal composite, the nano-particle reinforced bimetal composite comprises the following chemical components by weight percent: 6-25% of Cr, 4-18% of Ni, 1.0-4% of Mo, 1.0-1.8% of Si, 1.2-3% of Mn, 0.4-2.2% of B, 0.1-1.2% of MgO, 0.2-2% of CaF2, 0.2-0.7% of C, 0.2-0.8% of Nb, not more than 0.9% of one or the combination of CeO2, Y3O2 and La2O3, 0.0-0.8% of Co, and the balance of Fe, and mixed particles of nano-sized carbides, nitrides, borides or carbonitrides are added in alloy powder. The vacuum induction melting and the cladding processes and equipment are adopted for melting and cladding the mixture on a workpiece, the thickness of a cladding layer is 0.1-25mm, the cladding layer contains 1%-50% of nano-reinforcing particles of one or the combination of the carbides, the nitrides, the borides and silicides, and the cladding layer has special performances of wear resistance, corrosion resistance, electrical conductivity, self-lubrication performance and the like. A coating layer and a base material form the metallurgical bonding, thereby having high bonding strength, overcoming the drawbacks in various coating processes at home and abroad, leading the coating layer to avoid the defects of shrinkage cavities, inclusion, cracking, shedding and the like and having the advantages of high heating temperature, fast speed, high production efficiency, small energy consumption, simple preparation process and low cost.

The invention relates to aramid fiber enhanced wood-plastic composite material and a preparation method thereof, relating to fiber enhanced wood-plastic composite material and the preparation method thereof. The invention solves the problem that the existing wood-plastic composite material has bad comprehensive mechanical property. The wood-plastic composite material comprises thermoplastic, wood fiber material, lubricant, bulking agent and graft modification aramid fiber. The preparation method of the invention is as follows: 1. weighing raw materials; 2. preparing premixing materials; 3. melting, extruding and molding the premixing materials to obtain the fiber enhanced wood-plastic composite material. The preparation method utilizes carbon-carbon double bond and silane alkyl on the surface of modified aramid fiber and polyolefin and wood flour to form chemical bonds so that aramid fiber and polyolefin has good compatibility, and effectively enhances the interface binding force of the composite materials; the aramid fiber enhanced wood-plastic composite material simultaneously has high strength, high tenacity, and good comprehensive mechanical property. The method can be used for producing the wood-plastic composite material with high performances such as structural engineering materials, etc.

The invention relates to a micro-nano-alloy bimetal composite material preparation technique and a device thereof; one of wear-resistant and corrosion-resistant ferrous metal material, non-ferrous metal material and various self-fluxing alloy is prepared into power; then, the powder is added with less than or equal to 0.8% of one or combination in CeO2, Y2O3 and La2O3, 0.3-1.5% of MgO, 0.3-1.8% of CaF2, 0.0-1.5% of B, 0.1-0.8% of Nb, 0.1-1.0% of Ti, 0.1-2.0% of grain refining and recrystallization inhibitor according to the mass percent; or the powder is added with 1-40% of carbide, nitride, micro-nano or nano particles of boride; and the mixture is put into a high-energy stirring ball grinding mill for grinding and ball milling, so that the micro-nano or nano alloy powder can be prepared. A variable frequency induction heating device is adopted for cladding and melting vacuum or inert gas, so that a workpiece can be melted and coated with a micro-nano or nano scale alloy cladding layer which has the grain size of 0.1-35mm and is wear-resistant and corrosion-resistant, and the bimetal composite material can be prepared. The invention overcomes the defects in various coating techniques in China at present, can complete the preparation of the workpiece with the cladding layer having high thickness for once, does not need repeated coating and sintering, has high material utilization rate, low machining allowance and preparation cost, simple preparation technique and high production efficiency.

The invention belongs to the field of macromolecular composite materials and in particular relates to a wear-resistant hard composite material using a novel nanocarbon material graphene as a filler and a preparation method thereof. The composite material is a hard composite material plate formed by blending and hot-pressing a polymer matrix and the graphene, and is prepared through the following steps: mixing the graphene, the polymer matrix and a rare earth stabilizing agent uniformly; melting and blending by using a torque rheometer to obtain a block-shaped composite; hot-pressing by using a flat vulcanizing machine to obtain the hard composite plate, wherein the composite material comprises 0.1-3wt% of two-dimensional graphene nanocarbon material. The polymer-based composite material using the carbon material as the filler has the characteristics of light weight, easiness in processing, corrosion resistance, friction resistance and the like, and is widely applied in the fields of national defense industry and automobiles. The composite material can meet the increasingly higher tribological performance requirements of the fields of aviation, aerospace, automobiles, machinery and the like on the existing high-performance polymer composite materials; the preparation process of the composite material is simple; industrial production is realized easily.

The invention belongs to the technical field of superhard cutting tools, and relates to a WC-Co-cBN composite hard alloy and a preparation method thereof. The WC-Co-cBN composite hard alloy comprisesthe following chemical components of, by weight, 70%-90% of ultrafine/nano WC powder, 3%-15% of Co powder, 0.35%-0.75% of a grain inhibitor, 1%-10.75% of cBN micro powder with a surface plated with aMo, Ni and Ti metal film with excellent high-temperature and chemical stability, and 0.25%-5% of spherical mixed powder selected from Al, Ni, Cr, Y or other combinations; and the components are prepared into the composite hard alloy through spark plasma sintering. According to the WC-Co-cBN composite hard alloy and the preparation method thereof, the grain size of the prepared alloy is small, hardness, strength and toughness is high, wear resistance is good, the difficulty that heat stability of dry cutting is low can be overcome, machining cost is reduced, and the WC-Co-cBN composite hard alloy and the preparation method thereof are particularly suitable for high-performance machining cutting tools.

The invention discloses a method for constructing a roadbed through sand filling, and belongs to the field of traffic construction. In the technical scheme, the method is characterized by including the steps of surveying and setting out, surface clearing, filling, reinforcing, mixing, rolling compaction of a bulldozer, rolling compaction of a road roller and paving. The method solves the technicalproblem that in the prior art, the roadbed is prone to losing stability and deforming, and is applied to road construction to enhance the effect of roadbed stability.

The invention relates to a welding repair process suitable for a cast nickel-base superalloy casting. The process is suitable for welding repair of the cast nickel-base superalloy casting of which the mass percent of Ti does not exceed 5.2% and the mass percent of Al does not exceed 6.5%. Before welding repair, homogenization heat treatment is performed on the casting of which defective parts are removed, the holding temperature of the homogenization heat treatment is not lower than 1205 DEG C and is not greater than 93% of melting temperature of the casting, and the holding time is not less than 10 hours, so that the casting generates high-temperature tissues; the cooling speed of the casting after the homogenization heat treatment is not less than 30 DEG C per minute, so that the high-temperature tissues of the alloy are reserved, cracks are prevented during welding repair, the welding repair for many times is avoided, and the welding repair efficiency is effectively improved.

The invention relates to a process for preparing 3,3',5,5'-tetramethyl-4,4'-biphenyl didycidyl ether, wherein the 3,3',5,5'-tetramethyl-4,4'-biphenol is reacted with excess epichlorohydrin under the action of phase transition catalyst. The prepared has low epoxy equivalent weight, high yield, and simple reaction steps.

The invention discloses a metal material idler wheel type surface nanocrystallization method and belongs to the technical field of metal material surface nanocrystallization. According to the method, an idler wheel type surface nanocrystallization processing system is adopted to treat a metal material rotating member, and the surface of a metal material generates gradient plastic deformation under the controllable rolling action of an idler wheel, so that a gradient structure refinement layer is generated on the surface of the material; the depth of the gradient structure refinement layer can reach 800 mum to the maximum; an organizational structure on the upmost surface layer is converted into a nanocrystalline structure from a coarse-grain structure. Through idler wheel type surface nanocrystallization treatment, the surface smoothness of the metal material is improved to different extents, the harness of the surface layer changes in a gradient manner from the exterior to interior, and the surface hardness value is remarkably increased compared with the matrix hardness value.

The invention discloses graphene coating for corrosion prevention of a thermal power plant desulfurization chimney. The graphene coating consists of the following raw materials in parts by weight: 90 to 100 parts of film-forming resin, 0.5 to 3 parts of graphene, 0.5 to 2 parts of reinforced fibers, 10 to 20 parts of fillers, 10 to 20 parts of a curing agent, 15 to 30 parts of a diluents, 1 to 5 parts of polyacrylic acid, 1 to 5 parts of a polyethylenimin crosslinking agent, 1 to 3 parts of stearate and 2 to 6 parts of aids. By the mode of adding the raw materials, such as the reinforced fibers, the fillers, the polyethylenimin crosslinking agent and the polyacrylic acid, the defect that the existing corrosion-resistant coating has low durability and heat stability is overcome, the problem that the corrosion-resistant coating layer is easy to pollute and difficult to clean is solved, the developed graphene corrosion-resistant coating can completely adapt to the high-temperature strong-acid environment, the manufacturing process is simple, the practicability is high and the graphene coating is particularly suitable for thermal power plant desulfurization chimneys and flues.

The invention belongs to the field of refractory materials, and relates to a magnesium aluminate spinel-silicon carbide-aluminum composite refractory material. The magnesium aluminate spinel-silicon carbide-aluminum composite refractory material comprises aggregate and a matrix, wherein the aggregate comprises fused magnesia-alumina spinel particles and sintered magnesia-alumina spinel particles,and the addition amount of the fused magnesia-alumina spinel particles and the sintered magnesia-alumina spinel particles is 50-70% of the total amount of the raw materials; the matrix is silicon carbide, aluminum oxide and magnesium oxide; metal aluminum powder subjected to coating treatment is further added into the matrix, and the adding proportion is 2-8% of the total mass of the raw materials; and the aggregate, the matrix and a binding agent are uniformly mixed, undergo mechanical pressing molding, are dried, and then are sintered in a carbon-buried atmosphere to obtain the magnesium aluminate spinel-silicon carbide-aluminum composite refractory material. The high-temperature mechanical strength, the thermal shock stability and the coal cinder erosion resistance of the product are improved.

The invention relates to a device used to repair the surface crack of metal object and relative method. Wherein, it is characterized in that: it uses the arc embed element with same arc degree as crack surface; based on the condition of arc surface, preparing mould, marking crack line on the mould, and setting special bolts at two ends of crack line, to limit the crack; and drilling two mounting holes for positioning the mould at two ends of crack; and mounting the arc mould via said positioning holes on the arc surface; processing the arc embedded element mounting holes, and layering mounting the bolts on the crack part inside the mounting holes, to eliminate the crack; mounting special bolts at the joint between mounting hole and the crack, to be layered with the inner bolt of mounting holes; and processing the embedded element mounting hole.

The invention discloses a short fiber-reinforced high temperature-resistant rubber roll, a rubber roll rubber material and preparation methods thereof, and belongs to the technical field of rubber rolls. The rubber roll rubber material comprises the following components in parts by weight: 100 parts of ethylene propylene rubber, 50-80 parts of rapidly-extruded carbon black, 10-20 parts of a plasticizer, 3-5 parts of nanometer active zinc oxide, 2-6 parts of an anti-aging agent, 6-10 parts of a crosslinking agent, 2-10 parts of an assistant crosslinking agent, 3-8 parts of tackifying resin, 2-5 parts of a dispersing flowable agent and 2-10 parts of short fiber. The preparation method of the rubber roll comprises the following steps: preparing the rubber material, wrapping with the rubber material, vulcanizing in a vulcanizing tank, and turning. The rubber material is high in strength, rebound resilience, and resistance to high temperature and low in permanent compression deformation; the rubber roll made of the rubber material is high in resistance to high temperature and acid and alkali corrosion; the rubber roll is highly consistent in inside and outside hardness and material distribution and high in roller surface machining precision; the service life of the rubber roll is twice of or longer than that of the conventional high temperature-resistant rubber roll, so that the service life of the rubber roll is greatly prolonged.

The present invention relates to a composite reinforced concrete beam containing crack-resisting reinforcing layer, and it is characterized by that a composite material crack-resisting reinforcing layer can be stuck on the partial or whole tensile area of reinforced concrete beam, and its making method mainly includes the following steps: firstly, making reinforced concrete structure; then brushing a layer of interfacial adhesive glue on the treated undersurface of reinforced concrete structure and its partial side surface below contral line, then sticking composite material crack-resisting reinforcing layer on the surface of the above-mentioned interfacial adhesive glue. Said composite reinforced concrete beam has good crack-resisting property and large structure rigidity.

The invention discloses a VO2 film with a three-dimensional ordered porous network structure, and a preparation method and application thereof. The method stacks polystyrene microspheres on a glass substrate through a vertical immersion method, so that a die plate preparing a VO2 film can be formed; the die plate is immersed into a VO2 precursor solution, so that the slit between the polystyrene microspheres can be fully filled with V2O5 in the precursor solution; the V2O5 is converted into VO2 through follow-up drying and annealing process; the polystyrene microspheres are heated to evaporate, and the VO2 can form a three-dimensional ordered porous network shape; and the film has a complete three-dimensional ordered porous network structure. As the whole structure has holes, the holes canseparate fractures generated between VO2 particles on some frame, so that fracture force can be separated, and phase transition stress can be diluted.

The invention discloses a heat-resistant PVC shoe material which comprises components in parts by weight as follows: 10-20 parts of PVC resin, 5-10 parts of light calcium carbonate, 6-8 parts of nano titanium oxide, 1-5 parts of MBS, 2-3 parts of SMA, 3-8 parts of a plasticizer and 2-10 parts of a stabilizer. The invention further discloses a preparation method of the heat-resistant PVC shoe material. The heat-resistant PVC shoe material has excellent heat resistance, cannot be degraded at the high temperature, and is free of mechanical property loss, good in low-temperature flexibility, non-toxic and beneficial to environmental protection.

A surface powder coating and laser treatment method for improving the mechanical performance of a tungsten-copper alloy comprises the following steps that firstly, after ultra-fine crystal or nanometer crystal tungsten powder and ultra-fine crystal or nanometer crystal copper powder are mixed, ultra-fine crystal or nanometer crystal tungsten-copper powder is obtained; secondly, the tungsten-copperalloy is arranged on a base plate of a workbench of a selective laser melting device, the ultra-fine crystal or nanometer crystal tungsten-copper powder obtained in the step 1 covers the surface of the tungsten-copper alloy for a layer, and after a cabin door is closed and vacuumizing is conducted, argon or nitrogen or other inert gas is fed; thirdly, the ultra-fine crystal or nanometer crystal tungsten-copper powder coated in the step 2 is scanned by a laser beam of the selective laser melting device, the powder laser sintering or melting process is completed, after the alloy is cooled, theneeded material can be obtained after being taken out from a work chamber of the selective laser melting device. The surface powder coating and laser treatment method significantly improves the mechanical performance of the tungsten-copper alloy.

The invention discloses a full-biodegradable bionic bait and a preparation method thereof.The preparation method comprises the following steps: uniformly mixing modified polyvinyl alcohol, modified nano calcium carbonate, a phagostimulant, a pigment, an antioxidant, citrate and a lubricant in a high-speed mixer to obtain a blended material, adding the obtained blended material into a hopper of a double-screw extruder, and carrying out melt extrusion, drawing, cooling, pelletizing and drying to obtain modified polyvinyl alcohol particles. The addition of the starch can accelerate the degradation of the polyvinyl alcohol on one hand, and can reduce the cost of the bionic bait on the other hand, and the addition of the fibers can improve the water resistance, biodegradability and environment-friendly degree of the material, thereby achieving the purposes of improving the degradation speed of the bionic bait and protecting the environment.

The invention discloses a plastic metal composite pipe and a preparation method thereof, and belongs to the field of pipeline processing. According to the preparation method, alpha, omega-dihydroxyl polyphenylmethyl siloxane is added into a dealcoholizing crosslinker methoxyl triethoxysilane and a catalyst dibutyltin dilaurate to form an additive of a silicon rubber type plastic pipe base material, so that the low temperature resistance can be improved, and the low temperature resistance of a plastic-metal composite pipe can be increased; fumed silica and kaolin are added and modified throughgamma-(methacryloxy), and crazing is prevented from further developing and forming cracking, the impact resistance of the material and toughness and mechanical property of plastics can be improved; nylon-66 salt and decyldiamine sebacate are added to serve as a nylon mixture, the blend low-temperature initial property is effectively improved, and the low-temperature impact is strong, so that plastics cannot be embrittled under a low-temperature condition and have relatively good toughness, and the low-temperature resistance of a composite pipe can be reinforced. The plastic metal composite pipe can solve the problems of poor low temperature endurance and poor mechanical performance of an existing aluminum plastic composite pipe.

The invention relates to a laser-arc compound remanufacturing method for TRT bearing cylinder iron castings. Alloy powder comprises the following components in percentage by weight: 0.01-0.03% of C, 2.5-3.5% of Si, 0.5-1.5% of B, 0.2-0.5% of Fe, 10-15% of Cu, and the balance of Ni. Self-melting alloy powder is adopted to perform the laser cladding-arc welding compound remanufacturing repair on theTRT bearing cylinder iron castings; and cladding layers are lower in heat expansion characteristic, and brittle phases in repair layer and basal body interface areas can be prominently reduced, so that the interface area strength is improved, interface area cracks are prevented, and the repair quality is improved.