177results about How to "Overcome cracking" patented technology

The invention discloses a novel infrared and radar integrated stealth fabric and a preparation method thereof. The stealth fabric comprises an infrared camouflage surface layer and an antistatic bottom layer in turn from outside to inside; the infrared camouflage surface layer comprises an infrared stealth layer, a fabric layer and a radar wave absorption attenuation layer in turn from outside toinside; the infrared stealth layer is compounded by using a coating coated by an infrared stealth coating and a magnetron sputtering ITO (indium tin oxide) film arranged on the surface of the coating; the radar wave absorption attenuation layer comprises a sponge body; and a wave absorption material is adsorbed on the sponge body. The stealth fabric can realize radar stealth function and infraredstealth function at the same time, has good integral wave absorption effect and low surface density of materials, and has good effects on the aspects of breaking strength, bursting strength and the like. Moreover, excessive complex processes are not adopted for manufacturing the stealth fabric, and the stealth fabric can be produced by using a conventional fabric production method, so the stealthfabric is convenient for production and easy for implementation.

The invention discloses a composite foamed cement heat retaining panel using high-volume fly ash and a preparation method thereof; the composite foamed cement heat retaining panel is prepared by 60-80 parts of cement, 20-40 parts of fly ash, 0.6-3.0 parts of moisture repellent, 0.12-0.30 part of a water reducing agent, 0.8-3.0 parts of an exciting agent, 0.3-0.50 part of anti-crack fiber, 30-60 parts of water and 4-8 parts of a foaming agent (by weight); the preparation method comprises the following steps: weighing each raw material; adding the water, the anti-crack fiber, the moisture repellent, the cement, the fly ash, the water reducing agent; stirring a mixture; adding the exciting agent; stirring the mixture; adding the foaming agent; stirring the mixture so as to prepare mixed slurry; then, injecting the mixed slurry into a mould; putting the mould statically for 4-5 hours; removing the mould; after 24 hours, cutting and packaging a product; and maintaining the product until age is 28 days. According to the invention, a part of the cement is substituted by fly ash; cost is low; environment pollution is reduced; and social efficiency and economic benefit are obvious.

The invention involves a method of welding 12Cr1MoV alloy steel pipes. Process the welding surfaces of the two pipes into a sloping groove, and clean the welding surfaces and its neighboring area, fix the two pipes which to be welded along using a clamp. Preheat and insulate the pipe area near the weld. First weld the pipes with welding rod H08CrMoVA, then weld several layers manually with stainless steel welding rod, and at last impose a heat treatment to the pipe. The invention uses refractory stainless steel welding rod A242 taking the place of R317 as the bonding material of the weld. And the steel welding rod improves the mechanical performances and toughness. The weld will not have cracks and will not penetrated in the conditions of high temperature, high pressure and high alkali, and greatly extends the service life of the welding line.

The invention discloses a modified high-speed steel roller and a preparation method thereof. The modified high-speed steel roller is formed by adopting a centrifugal composite casting method and has a roller outer layer of high-speed steel and a roller inner layer of ductile iron or high-strength cast iron. The preparation method comprises the following steps of: forming the roller outer layer on a centrifugal casting machine; then, filling a static roller core with melted iron; and casting into a high-speed steel composite roller. The roller outer layer of the high-speed steel roller is prepared from raw materials in percentage by weight: 60-65 percent of M2 high-speed waste steel (W6Mo5Cr4V2), 1.0-1.4 percent of metal aluminum, 5.0-5.5 percent of boron iron, 9.2-9.4 percent of carbon ferrochrome iron, 0.2-0.4 percent of titanium iron, 1.0-1.2 percent of nickel-magnesium alloy and 18-23 percent of waste steel Q235. The roller can be produced by utilizing an electric furnace, has high hardness, simple and convenient process, low production cost and favorable wear resistance without adding noble iron alloy or quenching treatment and can have favorable economic benefits by popularization and use.

The invention discloses high-strength and vibration-free self-compacting concrete prepared from machine-made sand. The high-strength and vibration-free self-compacting concrete mainly comprises water, a cementing material, machine-made sand and gravels and is characterized in that the main technical parameters of the concrete are as follows: in the concrete, the water-binder ratio is 0.21-0.32, the water-powder ratio is 0.65-0.83, the sand ratio is 44-60%, and the unit paste volume dose is 0.45-0.53. The high-strength and vibration-free self-compacting concrete prepared from the machine-made sand, which is disclosed by the invention, has high flowability, non-segregation, uniformity and stability, flows relying on the self weight of the concrete in the process of pouring, and achieves a compacted effect without vibrating, so that the problem of cracking in section conversion in the process of construction is solved, and thus a series of purposes of reducing the amount of labor, accelerating the construction speed, reducing the construction noise, saving the construction cost, and the like are achieved.

The invention discloses underground anti-cracking and impermeable concrete with strength grade no more than C50. The underground anti-cracking and impermeable concrete is mainly prepared from a binding material, clastic rock, sand water and admixture, wherein the binding material is cement, mineral powder and coal ash; the admixture is a water reducer or an anti-cracking and impermeable agent and a water reducer. According to the underground anti-cracking and impermeable concrete prepared by the preparation method, green high-performance concrete is prepared from a lot of mineral powder and coal ashes in a compounding manner; the dosage of the cement for C30-C50 anti-cracking and impermeable concrete is reduced by 30-50% in comparison with that of common concrete, the production cost of the concrete is reduced, and the underground anti-cracking and impermeable concrete plays a protective role on the environment, and has significant economic benefits and social benefits.

The invention provides a manufacturing method for improving cupping value of a 3104 aluminum alloy strip. In the smelting process of 3104 aluminum alloy, the mass accounted by chemical components of the 3104 aluminum alloy in aluminum alloy raw materials is adjusted and optimized again; compared with the cupping value index of an aluminum alloy strip obtained through conventional chemical components and the subsequent treatment technology, the cupping value index of the aluminum alloy strip obtained through treatment of conventional working procedures of refining, grain refinement, degassing, filtering, casting, saw cutting, milling, homogenization heating, hot rolling, cold rolling, cleaning, side cutting, finished product perfect recrystallization annealing, inspecting packing and the like is greatly improved. The defect that the 3104 aluminum alloy strip produced through the conventional chemical components is prone to cracking after stamping is overcome, and therefore the deep drawability of 3104 alloy materials is improved.

The invention relates to a water fluorocarbon paint for external-wall painting, comprising solvent (water), water fluorocarbon latex, filler, composite film-forming auxiliary agent, disperser, moistening agent, leveling agent, thickening agent and germicidal agent. In the paint, solvent (water) covers 5 to 15 percent, water fluorocarbon latex covers 40 to 70 percent, composite film-forming auxiliary agent covers 5 to 14 percent, rutile titanium pigment covers 10 to 25 percent, talc powder covers 5 to 10 percent, disperser covers 0.1 to 0.5 percent, moistening agent covers 0.001 to 0.003 percent, leveling agent covers 0.004 to 0.01 percent, thickening agent covers 1 to 1.8 percent, and antifoaming agent covers 0.01 to 0.05 percent. The invention provides an efficient novel water fluorocarbon paint for external-wall painting by changing fillers and increasing the dose of composite film-forming auxiliary agent. The preparation process is simple, the paint is free of dehiscence, spurging and whitening; the painted wall-surface is smooth, and the light and color are well reserved; the paint has sound flexibility, weathering resistance, corrosion resistance, heat/cold resistance, acid/alkali resistance and better film-forming performance; the paint is environment-friendly, low-cost and construction friendly; and the prospect of development is very bright.

The invention relates to the technical field of preparation and repair of sliding bearing Babbitt metal anti-friction layers. The novel cold spraying technology is introduced into manufacturing and repair remanufacturing of a Babbitt metal sliding bearing bush lining anti-friction layer, atomization powder feeding is adopted to obtain coating microstructures with uniform components and fine dispersely-distributed and uniformly-dense crystal grains and second phases through cold spraying, and the good interface bonding characteristic is obtained through tinning layer setting and sprayed thermal treatment; the defects of poor structure uniformity, thermal impact, stress, cracking and oxidizing burning losses existing in the technologies such as a traditional casting method, an overlaying method and a thermal spraying method are overcome, the bearing bush component preparation quality and level are improved, the bush burning frequency is decreased, stopping supercritical vibration is lowered, the stability, accuracy and reliability of a bearing transmission unit are improved, and the service life of the bearing transmission unit is prolonged; the method is rapid, efficient and environmentally friendly, is used for bearing bush manufacturing and repair remanufacturing, and has good economic benefits and social benefits.

The invention discloses a high-strength Al-Cr-SC alloy through 3D printing. The metal powder for a high-strength aluminum-chromium alloy through 3D printing comprises the following components, by masspercentage, 2.5-10% of Cr, 0.5-2.5% of Mg, 0.1-0.9% of Sc, 0.2-0.7% of Zr, 0.1-0.3% of Si, 0.2-0.45% of Mn, 0.1-0.35% of Fe, 0.1-0.25% of Ti, 0.05-0.5% of AlCl3 powder, 0.05-0.3% of CaCl2 + NaCl andthe balance Al. The preparation method of the metal powder comprises the following steps that Al, Cr, Mg, Sc, Zr, Si, Mn, Fe, Ti pure metal block raw materials are weighed to be heated and melted, atomized for powder making, sieving and heat preservation for drying are conducted, AlCl3, CaCl2 and NaCl powder are added, and milling and mixing are conducted. According to the high-strength Al-Cr-SC alloy through 3D printing, the printed aluminum alloy part has no cracks and has high density, and the mechanical properties, wear resistance, corrosion resistance and high temperature and oxidation resistance are high.

The invention relates to a method for preparing modified wood by compounding heat treatment based on alkali lignin. The method comprises the following steps: (1) soaking the wood treated in vacuum ina 1,4-dioxane solution with alkali lignin, adjusting the pressure to 0.2-0.8MPa and retaining the pressure for 50-90 minutes; and (2) taking the wood soaked in the step (1) out, drying the wood, putting the wood under the condition at the temperature of 120-200 DEG C, and carrying out heat treatment for 1.5-4 hours to obtain the modified wood. The method is used as a non-toxic and long-acting woodmodification manner with low cost and simple process; the modified wood with high water resistance and high size stability is prepared by compounding a heat treatment method; the defects of high possibility of cracking and high possibility of deformation of the fast-growing wood can be effectively overcome; the bottleneck problem of utilization of the fast-growing wood at present can be solved.

The invention discloses an elastic circuit fabrication method based on a metal sacrificial layer process. The elastic circuit fabrication method comprises the following steps of pasting a metal thin film on a substrate; spin-coating photoresist on a surface of the metal thin film, and photoetching a circuit and bonding pad layout; fabricating metal circuits and bonding pads on a circuit and bonding pad layout region, spin-coating photosensitive organic soluble polymers, and photoetching a soldering mask layout; welding electronic components on the bonding pads; removing the photoresist and the photosensitive organic soluble polymers, casting an upper-layer elastic polymer and curing the upper-layer elastic polymer; stripping the metal thin film and an upper-layer structure thereof from the substrate; etching the metal thin film; and spin-coating and curing a lower-layer elastic polymer. By the elastic circuit fabrication method, a metal seed layer is not needed to be deposited, and the problem of metal wire crack or open circuit caused by different matching of the elastic polymers and metal heat is thoroughly solved; and meanwhile, a stress buffer layer is omitted, the process flow is simplified, only processes of photoetching, electroplating and etching are needed, and the elastic circuit fabrication method has the advantages of high yield, simplicity in welding and compatibility of a reflow soldering process.

The invention relates to a solenoid directional valve and a push rod and armature structure thereof. The push rod and armature structure comprises a push rod and an armature, wherein a valve element connecting section is arranged at one end of the push rod; an armature connecting section is arranged at the other end of the push rod; and a push rod radial pin hole is formed in the valve element connecting section of the push rod. The push rod and armature structure is characterized in that the armature connecting section of the push rod is provided with left-hand threads, a left-hand threaded hole is formed in one end of the armature, and the left-hand threads of the armature connecting section of the push rod is in left-hand thread connection with the left-hand threaded hole in one end of the armature. By the push rod and armature structure, the push rod is effectively prevented against being separated from the armature, the long-time existing circumstance that the push rod and the armature in the prior art are separated from each other due to counterclockwise rotation of the push rod is avoided, furthermore, the long-time existing circumstance of cracking caused by the reason that the push rod and the armature are welded integrally in the prior art is avoided, and therefore, work reliability is greatly improved.

The invention provides a gypsum-based ready-mixed mortar and a preparation method thereof. The ready-mixed mortar comprises 450-500 parts of hemihydrate gypsum, 550-600 parts of aggregate, 0.7-1.5 parts of compound modification additive, 0.2-1.0 part of foaming agent and 1-10 parts of setting retarder. The preparation method includes the following steps: mixing hemihydrate gypsum, aggregate, compound modification additive, foaming agent and retarder to obtain ready-mixed mortar. The gypsum-based ready-mixed mortar has strong adhesion to the substrate, which overcomes the shortcomings of easy cracking and hollowing in the use of traditional cement-based ready-mixed mortar; the one-time survival thickness is 4mm-2cm, which is smooth to the wall surface The requirements for the degree of strength are not high, and the construction requirements are greatly reduced; the hardening is fast, which can speed up the construction progress; the cost is low, and at the same time, it also has the advantages of good fire resistance, automatic temperature adjustment function, and light weight.

A steel pipe hollow concrete floor is equipped with a number of steel pipes in itself, the steel pipes are surrounded by concrete structure and forms hollow floor; two ends of the steel pipes are fixed on the frame beam combined with the floor. Said steel pipes not only can be used as the molding template, the poured concrete need not be demounted but as one part of hollow floor. The steel pipe hollow concrete floor in the invention has small floor integral section, light weight and large bearing capacity.

The invention discloses a silica sol-combined mullite perfusion material adapted to rapid repair of an industrial furnace, which belongs to the refractory material technical field. The perfusion material comprises the following raw materials by weight: 50-60% of mullite granules, 10-20 % of mullite powder, 5-10% of white alundum powder, 4-15% of alpha-active alumina micro powder, 0.6-1.0% of magnesium oxide powder, 0.5-0.7% of dextrin, 10-16% of silica sol and 1-2% of dispersing alumina. The silica sol-combined mullite perfusion material is characterized in that the silica sol is individually packaged; other components are weighted according to ratio and mixed through mechanical stirring to uniform aggregates in a dry state; on construction site, the individually packaged silica sol and uniform aggregates in the dry state are weighted according to ratio, and uniformly mixed and stirred and pumped for construction. The perfusion material has the advantages of excellent physical and chemical property and good application property, pumping for construction can be used, manpower and material resources can be saved, rapid repair requirement for various industrial furnaces can be satisfied, and the perfusion material is the excellent repair refractory material with strong adaptability.

The invention belongs to the technical field of architectural design structures, particularly relates to a design method of a steel fiber recycled concrete beam, and mainly provides a novel design structure method of steel fiber recycled concrete to effectively solve the technical problems of easy cracking and poor stiffness of the recycled concrete. The design method of the steel fiber recycled concrete beam comprises the steps of 1, determining the sectional width b and sectional height h of the designed reinforcement steel fiber recycled concrete beam; 2, determining the reinforcement ratiopMu of the reinforcement steel fiber recycled concrete beam; 3, determining the deflection value f of the reinforcement steel fiber recycled concrete beam; 4, conducting cracking checking calculation; 5, calculating the width of cracks. The design structure method not only effectively solves the technical problems of easy cracking and poor stiffness of the recycled concrete, but also effectivelyensures the structural stability of the steel fiber recycled concrete, and meanwhile the method is also effectively applied to weighing or non-weighing structure beams.

The invention belongs to the field of processing of isostatic graphite materials, and in particular relates to a one-time roasting method for an isostatic graphite product. The one-time roasting method for the isostatic graphite product comprises the step of performing one-time roasting on a pressed green body in a sagger, wherein the one-time roasting includes three temperature rising stages: when the temperature is 100-300 DEG C, temperature rising rate is 0.5-1.0 DEG C/h; when the temperature is 300-650 DEG C, temperature rising rate is 0.2-0.3 DEG C/h; when the temperature is 650 -1000 DEG C, temperature rising rate is 1.0-1.5 DEG C/h. Compared with the prior art, by optimizing and improving the temperature rising curve, heating duration and like factors of the one-time roasting, the method disclosed by the invention can be used for improving the coking rate of a binder, and the method can be also used for overcoming the shortcomings of crack and low product rate caused by small particles.

The invention discloses an environment-friendly thermal insulation mortar comprising the following components in parts by weight: 40-65 parts of Portland cement, 10-20 parts of thermal insulation aggregate, 5-10 parts of reinforced fibers, 5-10 parts of redispersible latex powder, 10-20 parts of filler, 1-5 parts of light calcined magnesia and 5-10 parts of kieselguhr. The environment-friendly thermal insulation mortar has excellent cracking resistance, high bonding strength, strong adhesive force and good thermal insulation heat insulation property, weather resistance, fire and water resistance and freezing resistance. By utilizing the environment-friendly thermal insulation mortar, such common problems of the thermal insulation mortar as cracking and flaking are overcome. The thermal insulation mortar is good in volume stability, generates volume microdilatancy during setting and hardening, does not crack or hollow and is strong in water resistance and ageing resistance and long in service life. The environment-friendly thermal insulation mortar is non-toxic, odorless, non-radioactive and harmless to a human body. By utilizing the environment-friendly thermal insulation mortar, the environment can not be polluted, energy is saved, the environment is protected, and electromagnetic radiation is absorbed.

The invention relates to a method for preparing expansion and breaking softened cork. The method comprises: (1) a step of removing impurities in raw materials, during which impurities on the surface of cork bark are planed and brushed to remove a black skin; (2) a step of adding water directly for expansion and breaking softening, in which cork is filled in an expansion and breaking softening tank with a heating system before impregnating smoldering, steaming and boiling, added with water on the basis of the prior water content till the total water content reaches 15 to 50 percent, closed and heated till the pressure rises to 0.5 to 3MPa/cm<2> and the temperature reaches between 100 and 230 DEG C, and kept at the temperature to be fully impregnated, the air is released quickly for pressure reduction, the air is compressed for cooling, and thus the expansion and breaking softened cork is obtained. The method has the advantages of avoiding pollution in the whole process, improving the utilization rate and excellent rate of natural materials due to environmentally-friendly production and fundamentally improving the quality of China cork raw material and products.

The invention relates to a method for preparing a stress-free GaN thick film on a sapphire patterned substrate, which comprises the following steps: 1, depositing a silicon oxide or silicon nitride film on a C-plane sapphire substrate; 2, photoetching bar-shaped silicon oxide or silicon nitride mask patterns in a [11-20] direction on the C-plane sapphire substrate of the deposited silicon oxide or silicon nitride film by the conventional photoetching technology; 3, transferring the photoetched bar-shaped silicon oxide or silicon nitride mask patterns onto the substrate by wet-process etching; 4, removing the silicon oxide or silicon nitride film by corrosion, and cleaning the substrate to obtain a clean sapphire patterned substrate; and 5, directly using a hydride gas-phase epitaxy system to epitaxially grow a GaN thick film on the obtained sapphire patterned substrate, and thus finishing the preparation.

The invention discloses a large-pipe-diameter Ni-V rotary target material containing microelements and the preparation method of the large-pipe-diameter Ni-V rotary target material. The rotary targetmaterial comprises the following components of, in percentage by mass, 0.01%-0.05% of C, 0.01%-0.08% of B, 0.001%-0.006% of Ti, 0.01%-0.05% of Mg, 6%-8% of V, and the balance Ni and inevitable impurities; and the preparation method comprises the following steps of vacuum melting, hot forging, machining, hot extrusion, acid pickling treatment, solid solution treatment, cold rolling or boring, annealing treatment, the machining or binding. According to the target material and the method, on the basis of Ni-V, trace elements of the C, the B, the Ti and the Mg are added for component optimization,the contents of oxygen, sulfur and the like are reduced, the generation of cracks can be inhibited, the grain boundary binding force and strength of the target material are improved, and crystal grains are refined, so that the yield is improved; and the rejection rate is reduced by optimizing hot working process parameters.

The invention discloses ultra-thin weather-proof and anit-cracking organosilicon fire-proof paint which is prepared from the following raw materials by mass percentage: 25-35% of modified nano polysiloxane oligomer, 5-8% of tri-functional organosilicon cross-linking agent, 2-5% of tetra-functional organosilicon cross-linking agent, 5-10% of hydrophobic fumed silica, 5-8% of titanium dioxide, 20-25% of ammonium polyphosphate, 8-12% of melamine, 9-15% of surface coating pentaerythritol, 2-5% of aluminum hydroxide, 2-6% of glass fiber powder, 3-10% of hydroxyl silicone oil, 1-2% of amino silane coupling agent, 0.5-3% of epoxy silane coupling agent and 0.1-0.3% of catalyst. Construction procedures of the paint are reduced; the use cost of the paint is lowered; and at the same time, a service life of the paint is further ensured.