257 results about "Breaking strength" patented technology

The invention discloses a coal gangue-based reinforced cement composite material and a preparation method thereof, and relates to the technical field of building materials. The coal gangue-based reinforced cement composite material is prepared from a coal gangue-based reinforced admixture, calcium ion doped modified multi-walled carbon nanotubes, polypropylene fibers, P.O42.5 Portland cement, metakaolin, silica fume, a polycarboxylate superplasticizer and water, calcium ion doped modified multi-walled carbon nanotubes and a coal gangue based reinforced admixture are cooperatively added into a cement matrix, seamless filling from nanometer to micrometer is achieved, a tough interface transition area is formed, pressure is jointly borne by a compact matrix and a strong interface, the compressive strength and breaking strength of the material are remarkably enhanced, and meanwhile, the compressive strength and breaking strength of the material are greatly improved. Migration of moisture and ions is effectively blocked, and the anti-permeability performance of the material is improved.

The invention relates to the field of refractory castable, in particular to mullite-based modified high-strength refractory castable and a preparation process thereof. The refractory castable is used for solving the problems of low strength and poor wear resistance of the existing refractory castable. The niobium-zirconium alloy and the benzoxazine-PAMAM copolymer are added into the refractory castable, the benzoxazine-PAMAM copolymer wraps a matrix in a three-dimensional network structure, so that the cohesive force is improved, a carbon layer is formed among matrix particles after sintering to improve the overall compactness of the material, micropores in the matrix of the refractory castable can be filled with the niobium-zirconium alloy, the porosity is reduced, and the porosity of the refractory castable is improved. The refractory castable disclosed by the invention can be used for reducing stress concentration, remarkably improving normal-temperature compression resistance and breaking strength, maintaining long-term high-temperature strength and ensuring that the refractory castable can still be kept stable in severe environments such as high temperature, high pressure and corrosion, so that the service life is prolonged, and the production safety is improved.

The invention belongs to the technical field of light-weight high-strength aramid fibers, and particularly relates to a light-weight high-strength aramid fiber composite cord fabric and a production method thereof.According to the light-weight high-strength aramid fiber composite cord fabric and the production method thereof, by designing a yarn guide component with the proper roughness range and the twisting speed, friction of the yarn guide component to fibers is reduced, and strength loss is reduced; a certain twisting direction, twisting degree ratio and twisting tension of the A yarn and the B yarn are designed, so that the A yarn and the B yarn contribute the maximum strength at the same time. Therefore, on the premise that the specification of the cord fabric is not changed, the breaking strength of the aramid fiber composite cord fabric is improved.

The invention relates to the technical field of fabrics and discloses a wear-resistant and anti-pilling composite fabric and a preparation method thereof. According to the invention, a betaine polyaramid finishing agent and an emulsifier are added to water, stirred, and then a cotton fabric composite fabric is added for finishing, followed by two dipping and two padding, pre-baking, and baking to obtain the wear-resistant and anti-pilling composite fabric. The side chain of the betaine polyaramid contains active hydroxyl groups, which interact with the hydroxyl groups on the surface of the cotton fabric by hydrogen bonding and the like, thereby improving the bonding force between the two and making the polyaramid finishing agent more firmly adhere to the fabric surface and not easy to fall off after washing. The breaking strength, anti-pilling performance and wear resistance of the finished cotton fabric are significantly improved, and the fabric still has good breaking strength and wear resistance after multiple washings, thereby reducing fabric damage caused by wear and tear, enhancing the anti-pilling effect, ensuring the flatness and beauty of the fabric, and significantly extending the overall service life of products made of the fabric.

The invention relates to the technical field of cement, and particularly discloses Portland cement and a preparation method thereof.The preparation method comprises the following steps that S1, 70-85 parts by mass of limestone, 10-20 parts by mass of clay, 3-5 parts by mass of iron ore, 3-6 parts by mass of silica fume, 0.8-2 parts by mass of calcium fluoride and 2-4 parts by mass of activated aluminum oxide are smashed and mixed to be uniform, 8-12 parts by mass of pulverized coal and 0.15-0.85 part by mass of a combustion improver are added, and a mixture is obtained; uniformly mixing to obtain a mixed raw material; s2, the mixed raw material is preheated and then calcined, the calcination temperature ranges from 1200 DEG C to 1400 DEG C, the calcination pressure ranges from 800 Pa to 1200 Pa, the calcination time ranges from 30 min to 60 min, cooling is conducted, and the Portland cement is obtained. According to the invention, by optimizing the raw material ratio and calcining in sections, the stability, compressive strength and breaking strength of the cement are effectively improved.

The invention discloses a preparation process of composite cement based on activation of steel slag micro powder, belongs to the technical field of cement preparation, and aims to solve the technical problem that durability and stability of cement are difficult to further improve in the prior art. A composite cement preparation process based on steel slag micro powder activation comprises the following steps: adding final powder, a polycarboxylate superplasticizer, a retarder and a defoaming agent into a stirring kettle, and uniformly stirring to obtain composite cement; according to the invention, through synergistic combination of the composite activator, the activated steel slag micro powder and the porous silicon-aluminum-calcium sustained-release microspheres, a multi-layer reaction system with early-stage excitation, middle-stage reinforcement and long-term reinforcement effects is constructed; all the components are complementary in time and space to form a compact and continuous skeleton structure, the aperture is refined, the interface is stabilized, and the internal humidity and ion supply are maintained, so that the compressive strength and breaking strength of the concrete are remarkably improved, the shrinkage rate is reduced, and the impermeability and freeze-thaw resistance are improved.

The present application relates to the manufacture of high-strength steel coated plate welded parts, in particular to a welding material, a high-strength steel workpiece, a laser welded joint and a manufacturing method thereof. The composition of the welding material satisfies the following conditions in terms of percentage by weight: C is greater than or equal to 0.5%, trace alloying elements are 0-0.36%, the content of Mn and Si is less than or equal to 2%, 6% is greater than or equal to 5C+Mn and is greater than or equal to 2.5%, and the rest is Fe and inevitable other elements; the trace alloying elements are at least one of Nb, V and Ti elements, and the content of Nb, V and Ti elements is less than or equal to 0.12%. The method does not need to remove the aluminum coating, utilizes the solid solution strengthening effect of C, and makes the volume fraction of lath martensite in the final weld after quenching greater than or equal to 90%. This scheme reduces the addition of alloying elements, reduces the cost and process control difficulty, avoids the formation of coarse carbides, improves the mechanical properties and stability of the joint, has high fracture strength and elongation, and realizes the double improvement of the strength and toughness and economy of the joint.

Provided is a foam sheet which has a tensile strength of 1-9 MPa, a breaking strength of 3.5 MPa or less when an interlayer strength measurement is performed, does not break when the interlayer strength measurement is performed, and has a thickness of 0.05-0.9 mm as a whole.

The invention relates to a panel material of a thermal insulation board, which is formed by curing panel slurry. The panel slurry is prepared from 26%-34% of cement, 38%-50% of quartz sand, 3%-10% of secondary coal ash, 2%-4% of silica fume, 0.6%-3% of a water reducing agent, 0.1%-1% of a defoaming agent, 0.1%-2% of an alkaline exciting agent, 0.1%-0.8% of graphene oxide grafted carbon fibers, 0.05%-1.5% of carboxymethylcellulose, 0.05%-1% of sodium gluconate, 0.8%-2.5% of an anti-corrosion inhibitor, 0.5%-2% of low-temperature water-based emulsion and 10%-16% of water. The sum of the percentages of the components is 100%. The panel prepared by the invention has the advantages of high compressive strength, breaking strength and corrosion resistance under the condition of smaller thickness (0.3-2cm), difficulty in cracking during drilling and the like, the service life of the thermal insulation board is prolonged, and the safety of the thermal insulation board is improved.

The present disclosure provides a member for a display device comprising a stacked body formed by stacking an impact absorbing layer and a hard coating layer, wherein, when measuring a tensile stress of the stacked body, a stress at which the hard coating layer breaks is regarded as a hard coating layer breaking strength, and an elongation at which the hard coating layer breaks is regarded as a hard coating layer breaking elongation, the hard coating layer breaking strength is 7 MPa or more, and the hard coating layer breaking elongation is 4% or more and 36% or less.

The invention discloses a light moisture-proof high-strength aerogel composite gypsum material and a preparation method thereof, belongs to the technical field of composite gypsum preparation, and aims to solve the technical problem that the moisture-proof performance and the strength of a composite gypsum material in the prior art need to be further improved. According to the invention, hydrophobic aerogel particles, a composite binder and surface treatment reinforced fibers are introduced into a gypsum matrix and form a stable multiple synergistic effect in a system; the aerogel particles provide heat insulation and hydrophobic channels, the composite binder enhances bonding among crystals through a chemical network, and the reinforced fibers realize high-efficiency stress transfer and keep interface stability at high temperature, so that the prepared composite material has relatively high compression resistance and breaking strength, the softening coefficient is greatly improved, the heat conductivity coefficient is obviously reduced, and the composite material has good heat insulation and heat preservation effects. The combustion performance is obviously improved, and the mechanical property, the water resistance, the heat insulation property and the flame retardant property are comprehensively and uniformly improved.

The invention discloses an evaporator and power conversion equipment, and belongs to the technical field of radiators. The multiple supporting structures are connected between the first inner wall face and the second inner wall face, part of the supporting structures define a pressure relief area, the pressure relief area communicates with the evaporation cavity, and the strength of the pressure relief area is smaller than that of the area where the other supporting structures are located; the pressure relief part is arranged in the pressure relief area and is arranged close to one supporting structure which forms the pressure relief area in a surrounding mode. The geometric shape of the pressure relief area is suddenly changed at the pressure relief part through the pressure relief part, so that the edge of the part, located in the pressure relief area, of the pressure relief part generates stress concentration under the action of pressure, the yield limit or the breaking strength of a material is easily reached firstly, breakage occurs, and directional pressure relief is achieved. Due to the fact that the wall thicknesses of the shell in the corresponding pressure relief area and the non-pressure relief area are the same, the overall corrosion resistance and strength of the evaporator are improved, and the reliability of equipment is improved.

The invention belongs to the field of fiber materials, and provides a hollow acrylic fabric with thermal insulation performance and a preparation process thereof. The composite design of an acrylonitrile-based copolymer shell layer and an inner cavity silicon dioxide aerogel layer is adopted, a boric acid ester cross-linked network is formed through borax bath treatment to lock a three-dimensional crimp structure, and a hydrophobic modified silicon dioxide aerogel layer with the thickness of 50-200 nm is constructed in a fiber inner cavity; the mechanical-structural synergy that the single-fiber breaking strength is not lower than 3.5 cN / dtex under the condition that the hollowness degree is 30%-45% and the fiber dry-state crimp number is not smaller than 12 / 25 mm is achieved, the thermal resistance of the fabric reaches 0.065 m.K / W to 0.075 m.K / W, the air permeability is kept at 150 mm / s to 250 mm / s, and the fabric has the advantages of being good in air permeability, good in air permeability and the like. The contradiction between mechanical bearing and hollow structure design under the high-solid-content wet spinning fine denier condition, the contradiction between structural stability and fatigue durability of boric acid ester cross-linked three-dimensional curl after multiple times of water washing and the contradiction between low gram weight and high thermal resistance and the heat transfer mechanism of breathable comfort are solved, and the wide warm-keeping garment application value is achieved.

The application relates to the technical field of high polymer materials, and discloses a high-hygroscopic polyester composite material and a preparation method thereof. The polyester composite material prepared by the application is prepared by taking PTT polyester and hygroscopic modified polyester as main raw materials and adding a toughening agent, an antioxidant, an ultraviolet absorber and a lubricant, and the fiber yarn prepared by using the polyester composite material has high hygroscopicity while keeping the breaking strength and elongation at break. Therefore, the fabric prepared by taking the composite material as raw material has excellent moisture regain and hygroscopicity.

Provided is an austenitic heat-resistant steel having excellent creep rupture strength and excellent creep rupture ductility. The austenitic heat-resistant steel has a chemical composition comprising, in terms of mass%, 0.01-0.40% C, up to 3.00% Si, up to 3.00% Mn, up to 0.100% P, up to 0.100% S, 20.0-35.0% Cr, 20.0-48.0% Ni, 0.1-5.0% Mo, 0.01-1.50% Ti, 0.01-0.50% V, up to 0.030% N, up to 0.100% Al, 0.0001-0.0200% B, etc., and has an average austenite crystal grain size of 0.0-5.0 in terms of ASTM No. In the austenitic heat-resistant steel, the Ti, V, and Mo contents and a Ti amount, a V amount, and a Mo amount that are determined from an electrolytic extraction residue satisfy expression (i) and expression (ii).　(i): TiER+VER+MoER≤1.000 (ii): 1.00≤(Ti+V+Mo)-(TiER+VER+MoER)

The invention discloses a high-entropy alloy / carbide eutectic composite material CoCrFeNiTaC0.5 and a preparation method thereof. The material is composed of Co, Cr, Fe, Ni, Ta and C according to the molar ratio of 1: 1: 1: 1: 1: 1: 0.5, and the microscopic structure comprises a primary phase TaC and an eutectic structure formed by compounding an FCC high-entropy phase and M2C, M3C and M7C3 type carbides. The eutectic composite material CoCrFeNiTaC0.5 disclosed by the invention has high strength and good plasticity, wherein the breaking strength is 2333 MPa, the yield strength is 1623 MPa, the breaking strain is 18.69%, and the Vickers hardness is 596.1 HV.

The invention relates to the technical field of metallurgical coking, and provides a devitrification and CO erosion resistant zero-expansion silica brick and a preparation method thereof.The devitrification and CO erosion resistant zero-expansion silica brick is prepared from, by weight, 3-10 parts of nanoscale alpha-Al2O3, 15-35 parts of andalusite, 30-40 parts of high-purity fused mullite, 10-20 parts of superfine silica powder, 2-5 parts of silica sol binding agent and 3-5 parts of composite mineralizer. Through the synergistic effect of the design of the composite mineralizer and the stepped heat treatment process, the technical problems that the existing zero-expansion silica brick is easy to devitrify and crystallize fused quartz, poor in CO erosion resistance and lack of crystallization degree during long-term use at high temperature are solved; the thermal shock cycle index and the high-temperature breaking strength of the material can be improved, the formation of alpha-cristobalite crystallization peak is effectively inhibited, and the mass loss is reduced in a reducing atmosphere, so that the structural stability of the material is enhanced, and the service life of the material is prolonged.

The invention relates to a sealing element (10) for building waterproofing, comprising a stretchable adhesive layer (11), wherein a concrete contact layer (12) comprising polyurethanes or polyurethane copolymers is applied to the adhesive layer (11), wherein the concrete contact layer (12) is a temporarily stable layer and the breaking strength of the concrete contact layer (12) is reduced to at least 20%, preferably at least 10% and particularly preferably at least 5% after storage in an aqueous 0.1 M NaHCO3 solution for a period of seven days at 23 °C compared to the breaking strength of the concrete contact layer without storage.

A hollow fiber element for a separation membrane module, including a plurality of hollow fiber membranes, and a tube sheet which is formed of a cured product of an epoxy composition and fixes and adheres at least one of the ends of the hollow fiber membranes. The cured product has a breaking strength retention of 75% or higher as measured in the form of a 0.2 mm thick film, the breaking strength retention (%) is defined as B1 / B0×100, B1 is a breaking strength (MPa) measured at 23° C. after the film is immersed in ethanol at 130° C. for 120 hours; and B0 is a breaking strength (MPa) measured at 23° C. before immersion in ethanol.

The present application relates to polybutylene terephthalate (PBT) material toothbrush filament technical field, specifically relates to a kind of multifilament version anti-lodging PBT monofilament and preparation method thereof;The preparation method is realized with the basic concept of multifilament to realize the basic form of monofilament, in the drawing process, every three monofilaments are gathered into a multifilament, in the subsequent water cooling, oiling etc. Process path, with the mode of multifilament, drafting, winding forming are completed.In the condition that monofilament specification remains unchanged, corresponding design is carried out to production process, and the quality indexes such as breaking strength, breaking strength variation coefficient, breaking elongation, breaking elongation variation coefficient of monofilament are controlled.In the realization equipment efficiency is improved three times target, product quality is upgraded, and the anti-lodging performance of PBT monofilament is improved.

The present application relates to the technical field of steelmaking auxiliary materials, in particular to a method for improving the balling rate of molybdenum oxide composite briquetting, in which process, in order to control the material temperature and overcome the problem of reaction heat release in the material, raw dolomite or limestone particles which are not easy to react with water are used to replace the traditional inhibitor lime, and the chemical reaction heat production is effectively controlled; the briquetting process provided by the present application adjusts the conventional one-time stirring and mixing to twice stirring, dry ice is added for cooling during the stirring process, and each time after stirring, standing is carried out, and through the above measures, the problem of material heating caused by the heat generated by material stirring and chemical reaction and then causing the problem of cracked briquetting after briquetting can be effectively solved. The balling rate of the molybdenum oxide composite briquetting for steelmaking produced by the process reaches more than 90%, the breaking strength is greater than 600N, and the falling strength is more than 15 times / (0.5m).

The invention discloses blast furnace stemming and a preparation method thereof. The invention discloses a high-temperature-resistant wear-resistant coating which is characterized by comprising the following components in parts by weight: 380-420 parts of brown aluminum oxide, 70-90 parts of a carburant, 50-70 parts of Guangxi white mud, 110-150 parts of silicon carbide, 15-30 parts of asphalt powder, 5-30 parts of vanadium carbide or chromium carbide or a mixture of vanadium carbide and chromium carbide or pore-forming vanadium chromium carbide and 50-100 parts of liquid resin. The blast furnace stemming disclosed by the invention has relatively high high-temperature breaking strength, normal-temperature compression strength and normal-temperature breaking strength, and excellent slag and molten iron erosion resistance and molten iron scouring resistance.

The invention relates to a steel powder mixture for the additive manufacturing of parts, preferably for the production of parts of machine and vehicle constructions, consisting of a low alloy steel having a high yield strength and yield point, a breaking strength of up to 18%, a tensile strength of up to 900 N / mm2 and a hardness of-30 HR.

The present invention provides: a medical shaft that can be used to smoothly remove a hollow lead implanted in a body, for example; and a medical device using the same.　A medical shaft 1001 comprises a first member 1011 extending along a long-axis direction. The first member 1011 has a first portion A11, a second portion A12 provided closer to a base-end side than the first portion A11, and a third portion A13 provided closer to the base-end side than the second portion A12. The tensile breaking strength of the second portion A12 in the first member 1011, which is measured in such a way that tension is applied in the long-axis direction of the first member 1011, is lower than the tensile breaking strength of the first portion A11 and lower than the tensile breaking strength of the third portion A13.

The invention provides an ecological decorative plate and a preparation method thereof, and belongs to the technical field of novel wall materials. The ecological decorative plate comprises perlite particles, cement, inorganic silica gel, a powder curing agent, glutinous rice glue, a waterproof agent and fibers. The preparation method comprises the main technical means of cement-inorganic silica gel-glutinous rice glue composite bonding, fiber and double-layer zinc-aluminum-magnesium net multi-scale enhancement, waterproof agent and self-repairing microcapsule synergistic protection, powder curing agent and stepped curing process optimization, gradient structure design and silane coupling agent interface chemical bonding and the like. The technical problems that a traditional cement-based perlite plate is large in brittleness, prone to cracking, prone to stripping deformation caused by low structural enhancement efficiency, poor in waterproofness, long in maintenance period, difficult to give consideration to environmental protection and performance and the like are solved, and the effects of improving the breaking strength, reducing the water absorption rate, shortening the maintenance period, reducing the cost and the like are achieved. And meanwhile, the comprehensive technical effects of high strength, high toughness, durability and environmental protection are achieved.

The invention discloses a three-dimensional fabric unit which comprises a middle layer, an upper surface layer and a lower surface layer, and the upper surface layer and the lower surface layer are formed on the upper side and the lower side of the middle layer through weaving. The specification of a single bundle or a single thread f is 10dtex-300dtex, the specification of a single strand or the f number is 1-90, the specification of a single bundle or the f number breaking strength is less than or equal to 7cN / dtex, the surface yarns of the upper surface layer and the lower surface layer are single bundles or single threads f number, and the specification of the surface yarns is 20dtex-300dtex; wherein the surface yarn is a single bundle or the f number is 1f-600f; the thickness of a single bundle of veil or the f number is 0.03 dtex-300 dtex; and the single-bundle or f-number breaking strength of the yarn is less than or equal to 5cN / dtex.

The invention discloses a method for improving the strength of a NiCoCrFeAlW eutectic high-entropy alloy through heat treatment, and belongs to the technical field of high-entropy alloy material processing and performance optimization. The method comprises the steps that a high vacuum induction melting technology is adopted, and a NiCoCrFeAlW alloy cast ingot is obtained through melting according to a preset chemical proportion; carrying out heat treatment on the ingot casting sample in an air environment within the temperature range of 600-800 DEG C, wherein the heat preservation time is 1-10 hours; and water quenching treatment is carried out after heat treatment is completed, so that the optimized microscopic structure is reserved. The fine FCC strengthening phase separated out through heat treatment induction can effectively improve the yield strength and breaking strength of the alloy, and meanwhile, the structure uniformity is controlled to take plasticity into account. The process is simple, parameters are clear, the toughness matching performance of the material is remarkably improved, and the method is suitable for the application field of structural materials with both strength and toughness requirements such as aerospace and high-end equipment.

Provided is a heat-resistant alloy having excellent nitridation resistance and high-temperature creep rupture strength. This heat-resistant alloy contains, in mass%, 0.2% to 0.6% of C, more than 0% and 2.5% or less of Si, more than 0% and 2.0% or less of Mn, 0.03% or less of P, 0.03% or less of S, 33.0% to 50.0% of Ni, 24.0% to 50.0% of Cr, and the balance of Fe and impurities, the present invention relates to a rare earth element-containing steel sheet which is characterized by selectively containing more than 0% but not more than 1.8% of Nb, selectively containing more than 0% but not more than 0.5% of rare earth elements, selectively containing more than 0% but not more than 0.5% of Ti and / or more than 0% but not more than 0.5% of Zr, and selectively containing more than 0% but not more than 2.0% of W and / or more than 0% but not more than 0.5% of Mo.

The invention provides preparation and application of river stone and tailing ore composite concrete. The preparation method comprises the following steps: (1) respectively washing river stone and tailing ore with water, drying and removing impurities; (2) 100 parts of cement, 20 to 30 parts of an admixture, 180 to 220 parts of river stone, 80 to 120 parts of tailings, 1.5 to 2.5 parts of an additive and 35 to 45 parts of water; the admixture is formed by mixing fly ash and slag powder according to the mass ratio of 1: 1; the additive is a polycarboxylic acid type high-efficiency water reducing agent; (3) firstly, the river stones and the tailings are subjected to dry mixing for 2-3 min, then the cement and the admixture are added and subjected to dry mixing for 3-4 min, then 60%-70% of water is added and stirred for 4-5 min, finally, the admixture and the remaining water are added, and high-speed stirring is conducted for 5-6 min; and (4) pouring and vibrating the stirred concrete mixture, and performing standard curing for 28 days to obtain a composite concrete finished product. Through reasonable grading of the river stones and the tailings, the void ratio of the composite aggregate is effectively reduced, so that the compactness of the concrete is remarkably improved, and the compressive strength and the breaking strength of the finished concrete are effectively improved.

A test sample is provided for measuring tensile strength of an adhesive bond between two identical substrates. Each identical substrate has first and second identical ends. An end from one substrate is aligned with an end from the other substrate so that they completely overlap and abut each other. Adhesive is applied to the abutting ends. An alignment fixture aligns the substrates while the adhesive cures. Each substrate includes through holes for mounting to a test machine without the use of special grips. After a test sample has been tested to failure, a new test sample can be quickly made by reversing the orientation of the substrates by 180 degrees and using their opposite ends to make a new test sample. After both ends of a substrate have been used for testing, both ends can be cleaned and the substrates reused for new test samples.