100results about How to "Improves strength and hardness" patented technology

A high-performance acidic transparent silicone sealant belongs to the technical field of the adhesive. The sealant comprises the following components in parts by weight: 90-130 parts of hydroxyl-terminated polydimethylsiloxane, 10-60 parts of alkyl-terminated polydimethylsiloxane, 5-15 parts of crosslinking agent, 20-90 parts of silicon dioxide, 0.01-0.9 part of anti-yellowing agent and 0.005-0.15 part of catalyst, wherein crosslinking agent is the mixture of methyltriacetoxysilane and ethyltriacetoxysilane; anti-yellowing agent is one or more of ultraviolet absorbent and light stabilizer; and catalyst is dibutyltin diacetate or dibutyltin dilaurate. The invention does not depend on the foreign product and provides the high-performance acidic sealant so as to fills the gap that neutral transparent silicone sealant can not be used in the glass fishbowl; and the sealant has good bonding property to the substrate, and can not have blushing and yellowing and can have no pollution to the environment. The sealant can satisfy the demands of the specific curtain wall, glass roof and glass fishbowl.

The invention belongs to the technical field of polyurethane, and relates to a polyurethane composite material having a shape memory function sponge, and a preparation and using method thereof. The composite material comprises a component A, a component B and a component C, wherein the component A comprises polyether polyol and polymer polyol, a foam stabilizer and a foaming agent, and the component B comprises polyether polyol, isocyanate, a hardening agent and a polyether opening agent. The shape memory sponge can generate memory deformation along with temperature sensing and pressure, and has the advantages of moderate rebound speed, no obstructing and shrinkage, large physical mechanical strength, certain support strength and the like. By a mouse pad manufactured by the polyurethane composite material having the shape memory sponge, on one hand, the hardness and strength of the traditional memory sponge is improved, and the mouse pad has a certain support function for wrists; and on the other hand, the memory sponge has a temperature sensing effect and a shape memory function, so that the memory sponge can generate zero-pressure support for each part of the wrist, promote blood circulation for each part of the wrist, and relieve fatigue.

The invention provides a nickel bronze-steel compound double metal bearing material and a manufacture method thereof, in particular to a nickel bronze-steel compound double metal bearing material and a manufacture method thereof of a nickel bronze alloy sintered on the surface of a low carbon high grade plain carbon steel material. The nickel bronze-steel compound double metal bearing material of the invention is a layered structure; a basic layer is the low carbon high grade plain carbon steel material; a surface layer is the nickel bronze alloy; the nickel bronze alloy is sintered on the surface of the low carbon high grade plain carbon steel material. The manufacture method of the nickel bronze-steel compound double metal bearing material of the invention relates to a manufacture method for sintering the nickel bronze alloy on the surface of the low carbon high grade plain carbon steel material to form the nickel bronze-steel compound double metal bearing material by adopting the principle of a powder metallurgy sintering method.

The invention relates to an organic and inorganic hybridization nanometer super-hydrophobic fiber membrane and a preparing method thereof. The super-hydrophobic fiber membrane is a polystyrene/polyacrylonitrile nanometer fiber membrane comprising silicon dioxide particles modified by epoxy modified polysiloxane. The preparing method comprises the steps that under the indoor temperature conditions, the polystyrene (PS) is added into solvent to be stirred and dissolved, the silicon dioxide composite nanometer particles modified by epoxy modified polysiloxane are added into the mixture to be stirred to obtain a PS spinning solution; under the indoor temperature conditions, the polyacrylonitrile (PAN) is dissolved in the solvent to be stirred and dissolved, and the silicon dioxide composite nanometer particles modified by epoxy modified polysiloxane are added into the mixture to be stirred to obtain a PAN spinning solution; double-sprayer electrostatic spinning and drying are carried out, and then the organic and inorganic hybridization nanometer super-hydrophobic fiber membrane is obtained. According to the organic and inorganic hybridization nanometer super-hydrophobic fiber membrane and the preparing method, the strength of the hydrophobic fiber can be improved to a certain degree, the hydrophobic performance can be superior without modifying the surface through fluorochemicals and other low surface potential energy substances, and the problems that an existing super-hydrophobic fiber is complex in preparing process and low in strength are solved.

The invention discloses a high-toughness 3D printing paraffin forming material. The high-toughness 3D printing paraffin forming material is prepared from components of raw materials in percentage by mass as follows: 30%-50% of paraffin, 2%-5% of bee wax, 5%-10% of epoxy resin, 2%-3% of a curing agent, 2%-20% of a viscosity modifier, 20%-30% of a toughening polymer, 6%-25% of a high-hardness polymer, 2%-4% of a filling material, 0.1%-0.3% of dyes and 2%-4% of a phase transferring agent. The bee wax is added to physically modify a paraffin support material, and the impact toughness of the paraffin support material is effectively improved; meanwhile, epoxy resin and the corresponding curing agent are added, and the adding quantity of the epoxy resin and the adding quantity of the corresponding curing agent are adjusted, so that the bonding strength of the paraffin support material and a 3D printing product interface is moderate while the hardness and the strength of the paraffin support material are improved and the shrinkage is reduced, and the paraffin support material is easy to peel off, doesn't deform and doesn't affect the support function on the 3D printing product in the printing process when removed in the later period. The toughening polymer and the high-hardness polymer are added to the paraffin support material, the needle penetration of the material can be effectively reduced, the toughness of the material is improved, and the high-toughness 3D printing paraffin forming material has excellent overall properties.

The invention relates to a method for preparing a decorative material by utilizing modified plant straws. The preparation method comprises the following steps: with 100 parts of plant straws by weight as a cardinal number, weighing 20 parts of waste plastic particles, 3 parts of bamboo powder, 0.5 part of curcumin, 2 parts of calcined shell, 1 part of metal magnesium powder, 5 parts of calcined kaolin, 1 part of a fire retardant, 2 parts of linear polyethylene, 0.8 part of a silane coupling agent, 1 part of hydroxypropyl methylcellulose, 0.8 part of modified corn starch, 1 part of soybean oil, 0.5 part of cyclohexanone and 2 parts of nanometer silicon dioxide; airing the plant straws, smashing, drying straw powder, sending the straw powder to a reaction kettle to react, taking out the straw powder, cooling, and sending the straw powder to a refrigerating device to obtain modified straw powder; mixing the modified straw powder and other materials, pouring the mixture to a grinding machine and grinding for 2 hours; and carrying out hot melting extrusion to mold. The decorative material has high fire resistance, corrosion resistance, moisture resistance, steeping resistance, worm-eaten resistance, dimensional stability and the like.

The invention relates to an artificial hip joint with surface nanometer and porous structure in the technical field of medical appliance and a preparation method thereof. In the artificial hip joint, the part of a femoral head handle or/and acetabulum combined with human organism has a scale of surface layer grains of between 1 and 500nm, and has an evenly distributed porous structure; and the artificial hip joint has a gradient nanometer structure from the surface inwards, the scale of the grains gradually increase along with increase of distance with the surface, until a scale of a conventional untreated state is achieved, and the thickness of the gradient nanometer layer is between 1 and 500 mu m. The preparation method comprises the following steps that: the artificial hip joint obtains the nanometer gradient structure layer by surface high-energy treatment technology; and then, the nanometer gradient structure layer is subjected to acid treatment so as to obtain a porous structure on the surface, thereby obtaining the artificial hip joint. The artificial hip joint and the method not only can effectively reduce stress shield effect of an implant body and a bone, but also can improve interface combination of the prosthesis and the bone, effectively improve the loosened implanted prosthesis, and have excellent application in the field of biomedicine.

The invention discloses a multielement-enhanced heat-resistant corrosion-resistant magnesium alloy and a manufacturing method of the multielement-enhanced heat-resistant corrosion-resistant magnesium alloy. The ingredients of the multielement-enhanced heat-resistant corrosion-resistant magnesium alloy comprise pure magnesium ingots, pure zinc ingots, Mg-Gd alloy, Mg-Y alloy, Mg-Nd alloy, Mg-Ca alloy, Mg-Zr alloy and nanometer-scale NdN particles. The elements in the raw materials comprise, by mass, 3.5-5.0% of Gd, 1.0%-3.0% of Y, 0.5%-0.8% of Nd, 0.8%-1.5% of Zn, 0.3%-0.8% of Ca, 0.3%-0.6% of Zr, 0.5%-1.5% of nanometer-scale NdN particles and the balance Mg. The sequence of the mass percentage contents of the three rare earth elements of the Gd, the Y and the Nd from large to small is Gd>Y>Nd, and the mass percentage of the total addition amount of the three rare earth elements of the Gd, the Y and the Nd does not exceed 10%. The particle size of the nanometer-scale NdN particles is 80-150 nm. The steps of pretreatment and cladding of the NdN particles, preheating of the ingredients, smelting, refining, doping, pouring, sectioned solution treatment and artificial aging treatment are sequentially conducted, and then the fine, dispersive nanometer-precipitated-phase microscopic-structure heat-resistant corrosion-resistant magnesium alloy product is obtained. By the adoption of the multielement-enhanced heat-resistant corrosion-resistant magnesium alloy and the manufacturing method of the multielement-enhanced heat-resistant corrosion-resistant magnesium alloy, the manufacturing cost is low, and the heat resistance and corrosion resistance of the magnesium alloy are excellent.

The invention discloses a preparation method of a powder metallurgy gear with excellent performance and belongs to the technical field of powder metallurgy. The method comprises the steps that 1, mixing and stirring; 2, pressing and forming: powder metallurgy mixture is placed in a pressing machine, and the mixture is pressed into green body pieces; 3, sintering: the green body pieces are placed into a sintering furnace to be sintered; 4, heat treatment: the workpieces obtained from the step 3 are quenched and then tempered, and the workpieces are subjected to carbonitriding in a carburizing furnace, the workpieces are cooled to room temperature, and finished products are obtained by finish machining. According to the preparation method of the powder metallurgy gear with the excellent performance, the rigidity and the intensity of the tooth surface of the produced gear are improved by specific composition proportion, the abrasive resistance is enhanced, coal ash and gas ash are used as specific components of the powder metallurgy gear, and metallurgy waste is subjected to resource utilization.

The invention discloses a smelting preparation method for anti-yielding aluminum alloy section bar. The smelting preparation method comprises the following operation steps: preparing aluminum alloy melt, wherein the aluminum alloy melt is prepared from the following materials in parts by weight: 55-65 parts of 3003 aluminum ingots, 32-42 parts of waste aluminum products, 5-10 parts of boron carbide and 5-10 parts of nanometer quartz sand powder, and the fineness of the boron carbide is 5 microns to 8 microns; adding the materials to a smelting furnace; scattering a layer of covering agent to the surface of the melt to cover the melt when the furnace materials are heated up to be softened and collapsed, wherein the covering agent comprises the following components in parts by weight: 10-20 parts of CaO, 10-25 parts of Al2O3, 35-45 parts of SiO2, 12-30 parts of C and 12-23 parts of coal ashes. According to the smelting preparation method disclosed by the invention, the waste aluminum materials are added to the material ingredients for facilitating the stabilizing of the performances of the aluminum section bar and reducing the possibility that the quality of the aluminum section bar is affected by undetected materials during the smelting process of the melt. The ingredients are further optimized and the hardness and strength of the aluminum alloy are increased, so that the comprehensive performances of the aluminum alloy section bar are improved; and the chromizing treatment is carried out on the surface of the aluminum alloy section bar, so that the corrosion resistance of the oxide film on the surface of the aluminum alloy section bar and the binding force of the aluminum alloy section bar and the coating are improved.

The invention discloses a high-grade grey cast iron casting method. The method specifically comprises the following steps: firstly, a rear-furnace charging step; secondly, a molten iron smelting step, wherein added furnace charge is molten into molten iron, molten iron high-temperature refining is carried out after components of the molten iron are adjusted, and the adjusted molten iron components include: 2.8%-3.3% of carbon, 1.6%-2.1% of silicon, 0.2%-0.4% of manganese, 0.02%-0.07% of phosphor, 0.02%-0.06% of sulfur, 0.2%-0.4% of chromium, 0.3%-0.6% of copper, and 0.04%-0.1% of tin; thirdly, a molten iron inoculation treatment step; finally, a casting piece casting step. According to the high-grade grey cast iron casting method disclosed by the invention, the strength and hardness of a casting piece are improved by lowering addition of normal alloys manganese, sulfur, copper and tin in the gray iron casting production; the noble metals are not added, so that the casting piece product is prevented from generating the defects such as cavity shrinkage and porosity shrinkage while the production cost is lowered.

The invention discloses thermochromic glass. The thermochromic glass comprises anti-scratching film layers, protective glass layers, a thermochromic layer, arc-shaped rims, filling grooves, adhesion layers and shading gratings, wherein the thermochromic layer is designed in a center layer of the thermochromic glass, the protective glass layers are adhered to the upper and lower surfaces of the thermochromic layer, the anti-scratching film layers are adhered to the outer end surfaces of the protective glass layers, and the arc-shaped rims are designed at the outer ends of the left and right sides of the thermochromic glass and are filled with the adhesion layers. The thermochromic layer of the thermochromic glass is prepared by the steps of adding a small amount of silver sulfide into sodium aluminum borate glass as a photosensitizer, adding a trace amount of copper and cadmium ions as a sensitizer, preparing glass through fusion, carrying out thermal treatment at a proper amount to accumulate silver sulfide into particles; and the thermochromic layer is capable of effectively absorbing thermal radiation or long wave light, and light transmitting the thermochromic layer under burning sun becomes soft, shady and cool, so that the light blocking and absorbing capacities of glass are enhanced, and the hardness and the strength are enhanced.

The invention discloses an aluminum alloy used for casting a pot and a preparing method of the aluminum alloy. The aluminum alloy is formed by smelting an aluminum alloy base body and an additive. The additive is composed of iron powder, magnesium oxide powder, rare earth fluoride, nano-zinc powder, potassium permanganate, rutile powder, sodium fluosilicate, modified silicon dioxide, bentonite and sodium carbonate. The modified silicon dioxide is formed by adding acetic acid into a deionized water solution of tetraethyl orthosilicate for hydrolysis. Due to the fact that the substance including the iron powder, the magnesium oxide powder, the nano-zinc powder and the like is added into the aluminum alloy base body, the potassium permanganate is decomposed to generate oxygen and manganese dioxide at a high temperature, the generated manganese dioxide can be arranged in the aluminum alloy base body in a filling manner to enhance wear resistance of the base body, furthermore, the iron powder in the aluminum alloy can be oxidized, and therefore iron oxide, magnesium oxide and aluminum oxide can be combined at the high temperature to generate wild phases similar to iron-aluminum spinel and magnesia-aluminum spinel; and the wild phases are dispersed and distributed in a whole system, and therefore the melting point, strength and wear resistance of the final aluminum alloy are improved.

Disclosed is a blast furnace cooling tuyere. The blast furnace cooling tuyere comprises a front cap, a middle cap and a rear cap, wherein a cavity structure is enclosed by the front cap, the middle cap and the rear cap. A partition plate is arranged between the front cap and the middle cap to divide the cavity structure into a front cavity and a rear cavity. A cooling water inlet pipe and a cooling water outlet pipe are arranged in the rear cavity. The partition plate is provided with a partition plate water inlet hole and a partition plate water outlet hole. The cooling water inlet pipe and the cooling water outlet pipe communicate with the partition plate water inlet hole and the partition plate water outlet hole correspondingly. The front cavity is internally provided with a front cavity partition plate, and the front cavity partition plate is positioned between the partition plate water inlet hole and the partition plate water outlet hole. The cooling capability of a tuyere small sleeve can be improved, and the hidden danger of water leakage caused by a traditional casting structure can be eliminated, so that the service life of the tuyere can be prolonged, and the service quality and the combustion rate are improved.

The invention relates to martensite aging anti-microbial stainless steel and a preparation method thereof, and belongs to the technical field of materials. Chemical components of the martensite aginganti-microbial stainless steel comprise, by weight percent, 0.35%-0.50% of C, 13.5%-16.5% of Cr, 1.5%-4.5% of Cu, 0.5%-1.0% of Mo, 0.1%-0.2% of V, not larger than 1.0% of Mn, not larger than 1.0% of Si, smaller than 0.01% of P, smaller than 0.01% of S, smaller than 0.005% of O, not larger than 0.05% of N and the balance Fe. The preparation method of the martensite aging anti-microbial stainless steel comprises the steps of batching, smelting, casting forming, forging and heat processing and cold processing and heat treatment. The Cu element of a certain content is added, after the heat treatment process is optimized, the martensite-austenite ratio is adjusted and controlled, optimal matching of material strength and toughness is obtained, and good corrosion resistance and broad-spectrum mold resistance are shown.

The invention relates to a molding pipe split-flow mold which comprises a tail mold sleeve, a front mold sleeve, a transition support fixedly arranged between the tail mold sleeve and the front mold sleeve in a connecting mode, a mouth mold fixedly connected with a front end portion of the front mold sleeve, a split-flow support with a rear tail portion provided with a cone structure, and a core mold fixedly connected with a front end portion of the split-flow support. The split-flow support is contained in an inner cavity of the tail mold sleeve, an inner cavity of the transition support and an inner cavity of the front mold sleeve. The core mold is located in the mouth mold and coaxially arranged with the mouth mold. A flow pass used for passing of molten state materials is formed together between the outer wall face of the split-flow support and the inner wall face of the tail mold sleeve, the transition support and the front mold sleeve, and between the outer wall face of the core mold and the inner wall face of the mouth mold. At least one boss arching toward the flow pass is formed on the outer wall face of the core mold or the inner wall face of the mouth mold along the circumferential direction. The flow pass form a throat part with a decrescent cross section on the boss position. The molding pipe split-flow mold can improve density of molten materials in the flow pass, and enables intensity of molded plastic molding pipe products to be improved; and at the same time, utilization rate of a mold is also improved.

The invention provides a casting die based on 3D printing. The casting die based on 3D printing comprises a component I and a component II obtained through 3D printing. A cavity of the component I and a cavity of the component II are each filled with a resin fiber layer, a fiber layer and a foaming layer from outside to inside in sequence. A preparation method of the casting die comprises the steps of (1) modeling: segmenting a model into a plurality of components connected through dovetail grooves; (2) using a 3D printer to conduct printing to obtain a plurality of components of a hollow structure; (3) machining a filling port in the plane of each component; (4) filling up a cavity of each component with a mixture of slow dry resin and reinforce fiber; (5) adding glass fiber into the cavity of each component; (6) injecting a foam material into the cavity of each component; (7) connecting the components through the dovetail grooves; and (8) filling up gaps of the dovetail grooves with A/B glue, conducting coating of epoxy resin and then conducting grinding and polishing. The casting die based on 3D printing and the preparation method thereof have the advantages that the precision is high, the preparation cycle is short, the weight is low, the die strength is high, and the production cost is low.

The invention discloses a precision and anti-corrosion air cooler fan blade comprising a fan blade body. The fan blade body comprises, by weight, 1.23%-1.56% of Zr, 2.3%-2.9% of Re, 1.32%-1.59% of Bi,1.03%-1.23% of C, 2.33%-4.58% of Si, 1.26%-1.38% of Mn, 0.12%-0.15% of Mo, 0.6%-0.9% of Co, 2.23%-2.58% of Ge, 2.5%-3.6% of Ti, 33%-38% of lanthanum rare earth, and the balance Fe and trace impurities; and the rear earth comprises, by weight, 8.8%-9.5% of Ce, 6%-9% of La, 1.23%-6.8% of Y, 11%-15% of Sc, 11%-16% of Gd, 2%-6% of Sm and the balance Gd.

The invention discloses a preparing method and application of a laser cladding precipitation-hardening stainless steel wear-resisting anti-corrosion coating. A basis material is 1Cr15Ni4Mo3N precipitation-hardening stainless steel and comprises, by weight percentage, 0.11%-0.16% of C, 0.5%-1.0% of Mn, 2.3%-2.8% of Mo, 4.0%-5.0% of Ni, 14.0%-15.5% of Cr, 0.05%-0.10% of N, not larger than 0.7% of Si, not larger than 0.02% of S, not larger than 0.03% of P and the balance Fe; and a cladding layer material comprises, by weight percentage, 10.65%-12.50% of C, 2.36%-2.77% of Mo, 4.08%-4.79% of Ni, 11.18%-13.12% of Cr, 1.96%-6.02% of N, 0.23%-0.37% of Al, 0.16%-0.25% of Si, not larger than 0.05% of S, not larger than 0.05% of P and the balance Fe. A synchronous powder feeding manner is adopted for feeding cladding layer powder to the positions below laser beams through a powder feeder to be melted, the cladding layer powder solidifies on the base surface to form a cladding layer, and the laser cladding precipitation-hardening stainless steel wear-resisting anti-corrosion coating is used for rotor hubs of large business machines, air battle machines and helicopters in the field of spaceflight, aviation and ocean and is used for fasteners and force bearing parts with high wear resistant and corrosion resistant requirements.

The invention discloses martensite heat-resisting steel and a preparation method thereof. The martensite heat-resisting steel is prepared from all elements in mass percent: 0.1 to 0.2% of C, 9 to 14%of Cr, 2.5 to 3.5% of Ni, 1.0 to 2.0% of Mo, 0.5 to 1.0% of W, 0.5 to 1.0% of Mn, 0.10 to 0.5% of Si, 0.10 to 0.5% of V, 0.1 to 0.5% of Nb, 0.02 to 0.05% of N and the balance of Fe, wherein dissolved-out carbon nitride compound is in a dispersively-distributed state, and the carbon nitride compound is prepared from M2X type, M7C3 type, MX type and M6C type carbide. According to the martensite heat-resisting steel disclosed by the invention, an alloying design of the martnesite heat-resisting steel and a tempering technology are accurately controlled and combined; by means of adjusting contentsand kinds of alloy elements and utilizing a lower temperature for tempering, high-temperature toughness performance of the martensite heat-resisting steel can be remarkably improved; high toughness is obtained, higher strength and hardness are kept simultaneously, and tempering brittleness is avoided.

The present invention relates to an iron-based component whose hardness in the vicinity of the surface is particularly well adjusted in addition to excellent sliding performance and corrosion resistance. The surface of the iron or iron-based alloy is coated with a nickel layer containing carbon or a nickel layer containing carbon and phosphorus. On the iron or iron-based alloy substrate, a nickel diffusion layer with reduced nickel content is formed toward the depth thereof, and the nickel diffusion layer At least the surface layer contains carbon.

The invention discloses an environment-friendly moisture-proof plasterboard which is prepared from the following raw materials in parts by mass: 25 to 35 parts of plaster, 8 to 11 parts of wood fiber, 7 to 9 parts of expanded perlite, 4 to 6 parts of calcium carbonate powder, 7 to 12 parts of borax, 3 to 5 parts of cement, 4 to 6 parts of alum expanding agent, 6 to 9 parts of stearic acid latex, 9 to 12 parts of polyvinyl alcohol emulsion and 8 to 10 parts of paraffin emulsion. The environment-friendly moisture-proof plasterboard disclosed by the invention has the advantages of high moisture resistance, high strength and hardness, no cracking, good economy, high environment-friendly property, flame retardance and fire resistance.

The invention discloses high-strength high-corrosion-resistance anti-microbial stainless steel and a preparation method of the high-strength high-corrosion-resistance anti-microbial stainless steel. The stainless steel has high performance, particularly high antibacterial property, high safety, ultra-high strength, high corrosion resistance, high wear resistance and good toughness. Compared with existing stainless steel for cutters, the high-strength high-corrosion-resistance anti-microbial stainless steel has the advantages of high hardness, high corrosion resistance, good antibacterial property and the like. Compared with steel for existing cutters, the content of carbon and chromium is adjusted in components, the silver element and the rare earth element are added, so that the materialhas high hardness and sharpness besides corrosion resistance and antibacterial property, the requirements of consumers can be met, and the grade of the cutters is improved. The steel has the high hardness of 56.0-60.0HRC, high pitting corrosion resistance and salt fog resistance. The steel is applicable to tools such as kitchen knives, scissors and the like, and can also be applied public facilities, household appliances and medical appliances.

The invention belongs to the technical field of metal surface treatment, and relates to a large-deformation enhanced rapid ion nitriding method. The large-deformation enhanced rapid ion nitriding method comprises the specific steps that original steel is machined and cut into a plate shape; plate-shaped to-be-nitrided steel is subjected to solution treatment; solid-solution-state to-be-nitrided steel is placed in a cold rolling machine to be subjected to cold rolling treatment; and the large-plastic-deformation to-be-nitrided steel obtained after cold rolling treatment is machined and cut intoa sample, and then ion nitriding treatment is conducted. According to the method, the large plastic deformation treatment is conducted before ion nitriding, the dislocation density in a microstructure is obviously increased, grains are obviously refined, in the nitriding process, a rapid diffusion channel is provided for nitrogen atoms through high-density dislocation and other defects, the ion nitriding efficiency is obviously improved, and the thickness of a nitriding layer is improved; and under the situation that the same nitriding layer depth is obtained, the nitriding time can be greatly shortened, accordingly, the energy is saved, and the production cost is reduced.

The invention relates to modified thermoplastic polyurethane elastomer and a preparation method thereof. A formula of the modified thermoplastic polyurethane elastomer comprises the following raw materials in parts by weight: 50% to 70% of grafted polyester polyol, 20% to 40% of diisocyanate and 5% to 15% of chain extender. The thermoplastic polyurethane disclosed by the invention can be easily prepared by a general preparation method; the styrene grafted modified polyester polyol is chosen to prepare the modified thermoplastic polyurethane elastomer, so that the problems of multiple steps, poor compatibility, compatilizer doping and the like in blending plastics are solved, and performance of the thermoplastic elastomer is obviously improved.

The invention provides a multi-component concrete surface reinforcing agent and a construction method thereof. The reinforcing agent is prepared from a component A, a component B and a component C. The component A comprises, in parts by weight, 10-15 parts of sodium alginate, 0.5-3 parts of fluorocarbon surfactant, 1-3 parts of nano silicon dioxide and water supplementing to 100 parts; the component B comprises, in parts by weight, 1 to 5 parts of fluorocarbon surfactant, 10 to 20 parts of soluble silicate, 10 to 15 parts of soluble fluosilicate, 0.1 to 2 parts of water reducing agent and water supplementing to 100 parts; and the component C comprises, in parts by weight, 5-10 parts of soluble calcium salt, 0.5-3 parts of a fluorocarbon surfactant and water supplementing to 100 parts. Sodium alginate permeates into the deep layer in the concrete and reacts with Ca<2+> to generate an insoluble gel system to block pores in the deep layer of the surface; soluble silicate and fluosilicatepermeate and react with Ca<2+> to generate gel of a cross-linked structure, pores in the surface layer of the surface are blocked, concrete is compacted fundamentally through cooperation of two timesof blocking, invasion of water, oil and other corrosive substances is effectively inhibited, and the durability of the concrete can be greatly improved.

The invention discloses an integral type hard alloy cutter for materials difficult to machine and a preparation method thereof. The material of the hard alloy cutter comprises the following components, by weight, 16-23 parts of titanium niobium alloy, 26-34 parts of copper molybdenum alloy, 22-28 parts of iron-nickel alloy, 4-5 parts of silicon sulfide, 9-11 parts of graphene, 4-6 parts of rare earth, 20-28 parts of graphite carbon fiber powder, 10-18 parts of cubic boron carbide micro powder, 15-18 parts of silicon dioxide, 9-12 parts of unsaturated resin, 5-9 parts of tungsten silicide and 5-7 parts of molybdenum carbide. The integral type hard alloy cutter has the beneficial effects that the rare earth, the graphite carbon fiber powder, the cubic boron carbide micro powder, the silicondioxide and the like are added, and therefore hardness and strength of the cutter are improved greatly; abrasion resistance and heat resistance of the cutter are also improved remarkably; the servicelife of the cutter is long, and practical cost is low; and pollution of the machining process is little.

The invention discloses a gluing method of a micro coreless cup motor winding, which comprises the following steps that: (1) a winding cup is wound, and motor glue is poured into a dripping hose; (2) a core rod with the diameter being equal to the inner diameter of the winding cup is selected, and the winding cup is wound on the core rod; (3) the winding cup which is sleeved on the core rod is put into a roll shaft of a glue rolling machine so that the winding cup rolls rotationally, a glue outlet system is started so that the dripping hose drips the motor glue onto the surface of the winding cup, and the roll shaft applies pressure onto the winding cup to uniformly distribute the motor glue inside and on the surface of the winding cup; and (4) the winding cup on which the glue is rolled is removed and put into an oven to be baked until the motor glue is fully cured. Motor glue is uniformly filled inside and on the surface of the hollow cup motor winding which is manufactured through the method, no glue blocks are left on the surface, the hardness and the strength are improved, the product pass rate is improved, and the load bearing capability and the working reliability of a motor are improved.

The invention discloses a preparation method for a combined nucleating agent used for casting. Rare earth ferrosilicon, ferromanganese, ferrosilicon and bariumsili are smashed into 0.5-15 mm particles, mixed according to weight percentage, heated to 380-420 DEG C and dried. The combined nucleating agent prepared through the preparation method disclosed by the invention can improve strength of castings and rate of finished products.

The invention discloses a hardfacing self-protection flux-cored wire, and belongs to the technical field of welding materials. The hardfacing self-protection flux-cored wire comprises a low-carbon hollow welding wire and a powder flux core arranged in the hollow welding wire. The hardfacing self-protection flux-cored wire is characterized in that the powder flux core comprises, by weight percent, 40%-60% of low-carbon ferrochromium, 5%-15% of rutile, 0-5% of marble, 2%-10% of fluorite, 2%-10% of zirconite, 5%-15% of a deoxidizing agent, 5%-10% of ferrotitanium, 3%-8% of ferrocolumbium and 3%-8% of ferrovanadium, and the filling rate ranges from 30 wt% to 40 wt%. According to the self-protection flux-cored wire, nitrogen in air can be utilized for alloying, and the content of nitrogen contained in hardfacing metal ranges from 0.6 wt% to 0.12 wt%; and the welding process performance of the hardfacing self-protection flux-cored wire is good, the average hardness of a surfacing layer ranges from 40 HRC to 58 HRC, and good use performance is achieved.