358 results about "Mass fraction" patented technology

The invention provides a concrete super-early-strength quick-hardening material, and relates to the field of building materials. The high-strength concrete comprises the following components in percentage by mass: 40%-50% of calcium aluminate, 30%-40% of gypsum, 8%-15% of high aluminum, 1%-3% of an additive, 3%-12% of an exciting agent and 1%-5% of an auxiliary material. According to the super-early-strength quick-hardening material provided by the invention, hour-level strength can be quickly and stably improved, and the strength increasing curve of each age is smooth and stable, so that the requirements of scenes such as road repair and tunnel construction on early strength can be met; it can be guaranteed that the 28-day compressive strength of the material breaks through 70 MPa, the later strength is kept stable, and the long-term safety of an engineering structure is guaranteed; the anti-seepage, anti-freezing and anti-erosion capabilities are realized in a complex environment, the service life of a project can be effectively prolonged, and the maintenance cost is reduced. In addition, the invention further provides a preparation method of the concrete super-early-strength and quick-hardening material, and the preparation method is used for preparing the super-early-strength and quick-hardening material provided by the invention.

The invention relates to a method for improving early-stage performance of an all-solid-waste cementing material, and aims to improve the early-stage performance of the cementing material. At present, the early strength (1d strength) of an all-solid waste cementing material is generally low, but the characteristic is closely related to construction efficiency and is a key limit for large-scale application of the all-solid waste cementing material. Sintering is not included in the working procedures, and the product does not contain cement clinker. The method comprises the following steps: selecting industrial solid wastes such as steel slag, blast furnace water slag, iron alloy slag, silicomanganese slag, industrial byproduct gypsum, sintering fly ash, fly ash, calcined coal gangue and the like as raw materials; the industrial solid waste is subjected to independent or mixed grinding treatment; by optimizing the raw material ratio and introducing key component minerals, the specific surface area of the cementing material is increased, and active sites of the key minerals are dissociated and exposed. The mass of the introduced key components for optimizing the raw material ratio accounts for less than or equal to 15% of the total mass of the cementing material, the mass fraction of the key and active minerals is increased by less than or equal to 10%, and the early strength of the all-solid waste cementing material is increased by 30%.

The invention relates to the technical field of powder metallurgy materials, and discloses a binding-phase-free hard alloy and a preparation method thereof.The binding-phase-free hard alloy comprises, by mass, 75-80 parts of WC; 8 to 12 parts of TiC; 5 to 8 parts of TaC; 3 to 5 parts of ZrC; 1.5 to 2.5 parts of HfC; 0.8 to 1.2 parts of rare earth oxide; the preparation method comprises the five key steps of core-shell structure composite powder preparation, high-energy beam melting gradient accumulation, microwave-magnetic field composite field activation, multi-stage pressure plasma sintering and staged variable-rate gradient cooling. And component gradient design is cooperated with a multi-field coupling process. Through collaborative design of a core-shell structure hard phase and a gradient composite phase, and in combination with a multi-field coupling activated sintering and gradient cooling process, the problem of obdurability balance of the non-binding-phase hard alloy is solved, the microstructure stability is optimized, and the comprehensive performance and the process controllability are improved.

The invention relates to the field of test and analysis of impurity element content of primary magnesium ingots, in particular to a method for testing impurity element content of primary magnesium ingots by ICP (inductively coupled plasma) spectrometry, which comprises the following steps: firstly adding H2O2 into a magnesium ingot sample to infiltrate the sample, then adding HCl at an interval of less than 1 minute to carry out first reaction, carrying out first heating after the reaction is finished, and then carrying out second heating, cooling to 20-30 DEG C, transferring to a volumetric flask, and fixing the volume by using third-level water to obtain a sample solution; establishing a working curve by using an ICP spectrometer and a standard solution; testing the sample solution; the ratio of the mass of the magnesium ingot sample to the volume of H2O2 to the volume of HCl is 1: (3-10): (30-54), the method fills the standard vacancy of ICP spectrometry analysis of the silicon element in the primary magnesium ingot, a reliable basis is provided for chemical component analysis of the primary magnesium ingot, the test result is surface, and the method for testing the mass fraction of the impurity elements in the primary magnesium ingot provided by the invention has the advantages of high analysis precision, simple operation, high accuracy and high reliability. The analysis period is short, and related chemical varieties are few.

The invention discloses a biomass fuel rod and a production method and application thereof, and belongs to the technical field of biomass fuels, the biomass fuel rod comprises the following components by mass: 60-80 parts of a biomass raw material, 10-20 parts of a binder, 1-5 parts of a combustion improver, 3-8 parts of a sulfur and chlorine fixing agent, 1-3 parts of a denitration agent, and 2-5 parts of an ash content regulator. The production method specifically comprises the following steps: (1) pretreatment: crushing a biomass raw material until the particle size is less than or equal to 2mm, and carrying out pretreatment by adopting baking semi-carbonization; (2) mixing: sequentially adding a binder, a combustion improver, a sulfur-fixing and chlorine-fixing agent, a denitration agent and an ash content regulator which are ground until the particle size is less than or equal to 2mm, and stirring and mixing for 5-10 minutes; (3) forming: carrying out extrusion forming by adopting a twin-screw extruder under the pressure of 15-25MPa and the temperature of 80-100 DEG C to obtain a fuel rod with the density of 1.2-1.4 g / cm < 3 >; the production method is simple and easy to implement, the combustion performance of the produced fuel rod is good, and the combustion efficiency and the environmental protection property are improved.

The invention discloses a high-dispersion and small-particle-size alpha-MoC1-x / SiO2 catalyst as well as a preparation method and application thereof. The catalyst is composed of alpha-MoC1-x nanoparticles dispersed on a silicon dioxide carrier, the alpha-MoC1-x / SiO2 catalyst is generated in a three-dimensional SiO2 confined network in a limited manner, wherein the three-dimensional SiO2 confined network is constructed by in-situ polycondensation of silica sol under the condition that the pH value is 2.3-2.8, and the molybdenum content is 30-60%; the average particle size of the alpha-MoC < 1-x > nanoparticles is 1.0-2.2 nm, and the alpha-MoC < 1-x > nanoparticles are highly dispersed in the SiO2 confinement structure; the alpha-MoC1-x nano-particles are face-centered cubic phase molybdenum carbide, and the mass fraction of the face-centered cubic phase molybdenum carbide is larger than or equal to 90 wt%. The alpha-MoC1-x / SiO2 obtained by the invention can realize higher methanol selectivity and intrinsic activity under the condition of 140-180 DEG C, and can stably operate for 100 hours. The invention provides a novel small-particle-size and high-dispersion molybdenum carbide catalytic material and a preparation strategy thereof for preparing methanol through low-temperature and high-selectivity CO2 hydrogenation.

The invention relates to the technical field of building engineering materials, in particular to an inorganic grouting material with adjustable curing time and a use method thereof. The inorganic grouting material provided by the invention comprises a main material and an adjusting material, the main material comprises the following components in parts by mass: 50-70 parts of sulphoaluminate cement clinker, 10-20 parts of quartz powder, 10-20 parts of gypsum, 3-5 parts of nano volcanic ash, 0.5-1 part of a water reducing agent and 0.1-1.5 parts of a retarder; the adjusting material comprises a composite coagulant and hydroxypropyl methyl cellulose. Through innovation of a material formula and innovation of a construction process, the problem that the grouting effect is poor due to the fact that a traditional grouting material cannot change the solidification time according to variable underground grouting scenes and requirements is solved; accurate grouting can be achieved under the conditions of different grouting depths, different crushing degrees, different diffusion radiuses, different mixing water temperatures, different coal and rock mass temperatures, different water inflow and the like.

The application provides a ferrite bainite steel and a preparation method thereof, and belongs to the field of steel preparation. The chemical composition of the ferrite bainite steel includes, in mass fraction, C: 0.18% to 0.22%, Si: 1.3% to 1.8%, Mn: 2.0% to 2.5%, P: less than or equal to 0.01%, S: less than or equal to 0.01%, N: less than or equal to 0.004%, and the balance of Fe and inevitable impurities. The metallographic structure of the ferrite bainite steel includes, in volume fraction, ferrite bainite: 50% to 65%, tempered martensite: 25% to 30%, MA island: 1% to 3%, and residual austenite: 7% to 10%. By reducing the coarse MA island and unstable blocky residual austenite, the crack initiation source is avoided, and the technical problems of poor hole expansion and elongation of the ferrite bainite steel in the prior art are solved.

The application discloses a low-grade lepidolite flotation combined collector and application thereof, and belongs to the technical field of mineral processing. The lepidolite flotation combined collector SDI-101 of the application is composed of a cationic collector and an anionic collector, and includes the following raw materials in mass fraction: 20%-80% of an amine collector and 20-80% of an amino carboxylic acid collector. The combined collector is used to cooperatively improve the flotation efficiency of the low-grade lepidolite ore. In the case that the Li2O grade of the lepidolite raw ore is lower than 0.5%, a lepidolite concentrate with a Li2O grade of about 2% and a recovery rate of more than 80% can be obtained through a 'one-roughing-one-cleaning-one-scavenging' flotation process. The lepidolite combined collector of the application is applicable to the low-grade lepidolite ore, and the raw ore does not need desliming treatment. The lepidolite combined collector of the application has the advantages of strong collecting property and adaptability, can effectively improve the grade and recovery rate of the lepidolite concentrate, and promotes the efficient use of lepidolite resources.

The invention discloses a preparation method and application of high-toughness anti-aging zirconia ceramic, and relates to the technical field of ceramic materials.The preparation method comprises the following steps that nano monoclinic zirconia with the D50 being 20-50 nm and the mass fraction being 99.7-99.8 wt%, aluminum oxide with the D50 being 200-400 nm and the mass fraction being 0.2-0.3 wt% and a dispersing agent are taken, and the dispersing agent accounts for 1-1.5 wt% of the total mass of powder; the preparation method comprises the following steps: by taking a high-purity aluminum oxide grinding ball as a grinding medium, stirring and grinding for 2-4 hours at the rotating speed of 700-1000r / min, and then grinding for 1-2 hours at the sanding rotating speed of 1500-2000r / min to obtain mixed slurry; nano monoclinic zirconia is adopted as a raw material, aluminum oxide and a dispersing agent are added for co-grinding, Y2O3 is deposited on the surface of ATZ composite powder in a magnetron sputtering mode, and a Y2O3 deposition layer can inhibit conversion from t-zirconia to m-zirconia, so that the anti-aging performance of the zirconia ceramic is improved, and the service life of the zirconia ceramic is prolonged. And the nano monoclinic zirconium oxide is directly mixed and ground with the aluminum oxide, so that the zirconium oxide raw material is more easily subjected to stress-induced phase change, and the toughness performance of the zirconium oxide ceramic is improved.

The invention provides fiber-improved anti-crack flow state solidified soil and a preparation method thereof, and belongs to the technical field of engineering materials, and the fiber-improved anti-crack flow state solidified soil comprises water and powder; the water-solid ratio of the water to the powder is 0.4-0.6; the powder material is prepared from the following raw materials in parts by mass: 84 to 85 parts of constructional engineering soil, 0.1 to 1 part of polyacrylamide modified aluminum silicate fiber and 10 to 20 parts of soil curing agent. The problems that in the prior art, traditional flow-state solidified soil is poor in toughness, so that the crack resistance and ductility are poor, and the water stability and the anti-scouring performance are low can be solved.

The application relates to a functionalized glass for SERS detection and a preparation method thereof, characterized by the following steps: a. tetraethyl orthosilicate and oxalic acid are mixed into a 0.02-0.10 moL / L sol in anhydrous ethanol according to a molar ratio of 1:2-5, a stabilizer with a volume of 5-50% is added, and then the mixture is stirred and transferred into a four-necked flask; b. after being heated and stirred for 12-16 hours, an anhydrous ethanol emulsion of polystyrene small balls with a mass fraction of 5-20% and a volume of 6-18% is added; c. an anhydrous ethanol solution of a surfactant P123 with a total mass of 2-8% and a weight concentration of 3-8% is added, and then the mixture is stirred and aged; d. a wet film is prepared on a glass substrate, and then the wet film is dried and kept warm; (2) a nano-silver particle dispersion liquid with a concentration of 5-25 mg / mL is prepared; and (3) the glass substrate prepared in the step d is coated with the nano-silver particle dispersion liquid and dried. The application has the advantages of simple process and low cost; the surface of the porous structure silica nano-particles has a large number of nanoscale gap structures, which is beneficial to obtaining an enhanced silver nano-particle surface plasmon resonance electromagnetic field, and greatly enhances the Raman signal of the adsorbed molecules.

The invention relates to the technical field of alkaline water electrolysis hydrogen production, and discloses a multi-parameter fusion gas-liquid separation effect online evaluation method, which comprises the following steps: acquiring alkali liquor mass fraction concentration, fluid temperature, actual mixing density and mass flow signals on a backflow alkali liquor pipeline of a gas-liquid separator in real time; dynamically calculating the theoretical density of the bubble-free sodium carbonate solution under the current working condition according to the mass fraction concentration of the alkali solution and the fluid temperature which are collected in real time; calculating the absolute deviation between the theoretical density and the actual mixing density; performing real-time noise level analysis on the mass flow signals; according to a comparison result of the absolute deviation and a preset density deviation threshold value; and outputting a separation result judgment result and executing corresponding alarm or interlocking control. The theoretical density of the bubble-free sodium carbonate liquid is dynamically calculated in the control unit in real time according to the online measured mass fraction concentration and temperature of the alkali liquid, and reliable separation result evaluation under the real-time concentration change working condition is achieved.

The application belongs to the field of acid dry materials, and specifically provides an acid dry material for a medium-frequency furnace based on micro-fined raw materials and a preparation method thereof.The acid dry material for a medium-frequency furnace based on micro-fined raw materials comprises the following raw materials in mass fractions: 70-80 parts of silica aggregate, 20-25 parts of micro-fined silicon powder, and 0.7-0.85 parts of a sintering agent.The micro-fined silicon powder is prepared by the following steps: S1: taking small-grained silica, drying, and then coarsely grinding to obtain coarse grinding material;S2: adding high-purity silicon dioxide powder and nano zirconium oxide to the coarse grinding material, mixing uniformly, and continuing to grind to obtain the micro-fined silicon powder.The acid dry material for a medium-frequency furnace based on micro-fined raw materials prepared by the application has the advantages of good sintering state, excellent high-temperature resistance, and corrosion resistance.

The invention relates to a low-carbon-emission high-performance IF steel plate and a preparation method, and belongs to the technical field of steel preparation. The IF steel plate comprises the following chemical components in percentage by mass: less than or equal to 0.0030% of C, less than or equal to 0.0060% of S, less than or equal to 0.030% of Si, less than or equal to 0.2% of Mn, 0.0030%-0.006% of N, 0.060%-0.12% of Al, 0.030%-0.080% of Ti, 0.0015%-0.030% of Nb, less than or equal to 0.0008% of B, less than or equal to 0.12% of Cu, less than or equal to 0.01% of Sn, less than or equal to 0.15% of Cr, less than or equal to 0.08% of Ni, 0.001%-0.02% of La + Se and a matrix element Fe, al / N is greater than or equal to 18 and less than or equal to 22, Ti is greater than or equal to 3.4 N, Nb is greater than or equal to 7.75 C, and Al / N represents the mass fraction ratio of Al to N. By accurately controlling the content of elements in steel, formation of a precipitated phase and distribution of grain boundary elements are controlled, and the influence of residual elements in waste steel and electric furnace nitrogen increase on the performance of a finished product is reduced. The short-process production of IF steel by the full-scrap steel electric furnace is realized, the production cost and carbon emission are reduced, and meanwhile, the high performance of the material is ensured.

The invention discloses a method for preparing an ultrathin diamond dicing blade through selective laser melting forming, which comprises the following steps: selecting spherical nickel powder with the purity of more than 99.5%, spherical copper-tin alloy powder with the purity of more than 99.5% and artificial diamond powder with the purity of more than 99.8%, adding 0.1-0.5% by mass of paraffin solution into the powder, and mixing for 30 minutes through a mixer to obtain an SLM (selective laser melting) printing material; the mixed powder is put into an SLM powder conveying system, SLM printing process parameters are set, the process parameters comprise laser power, scanning speed, scanning spacing, scanning layer thickness and printing strategies, and linear cutting, internal and external grinding, double-face grinding and edging treatment are carried out after model printing is completed; the SLM printing technology is adopted, the requirements for directly forming a complex three-dimensional structure and high precision of the diamond dicing blade can be met, the requirements for personalized sound fields and batch production are met, the production cost of products is reduced, and the quality is improved.

The application belongs to the technical field of alloys, and discloses a wear-resistant and tough steel as well as a preparation method and application thereof. The steel comprises, in terms of mass fraction, Cr 4.8-10.2%, Mo 0.8-2.5%, V 1.5-3.5%, C 0.8-1.5%, Si 0.8-1.8%, Mn 0.3-0.8%, Fe 79.7-90.7%, and inevitable impurities. The steel of the application is composed of Cr, Mo, V, C, Si, Mn and Fe with specific components and contents, so that the steel can meet the requirements of wear resistance and high toughness at the same time. The transverse impact energy of the 10*10*55mm unnotched Charpy impact specimen of the steel is 30-50J, and the longitudinal impact energy is 60-90J when the hardness is HRC60-64.

The present application belongs to the technical field of detection method, and particularly relates to a method for determining chlorides in reforming catalysts. The method comprises the following steps: burning the pretreated reforming catalyst sample to be determined to obtain a burned sample, adding water to extract the sample to obtain a chlorides extract, and determining the content of chlorides in the extract by silver nitrate titration. The temperature of the burning treatment is 600±25 DEG C, and the time is 1-3 hours. The present application discards the step of using magnesium chips / powder, which is an explosive hazardous material, in the traditional method, simplifies the sample pretreatment process, shortens the analysis time from 7 hours to 4 hours, eliminates the influence of wet base by calculating the mass fraction of alumina dry base and participating in the calculation of the content of chlorides, and improves the detection accuracy. The present application is safe, efficient, accurate and low in cost, and is suitable for monitoring chlorides in the whole life cycle of reforming catalysts in the petrochemical industry.

The invention relates to the technical field of anisotropic rubber, and particularly discloses anisotropic radiation-resistant rubber and a preparation method thereof, aiming at the problems that rubber used in nuclear industry such as shock absorption and isolation rubber components is always easy to crack, discolor, harden and the like due to the influence of a nuclear radiation environment at present, and particularly discloses the anisotropic radiation-resistant rubber and the preparation method thereof. Comprising 10%-30% of a rubber matrix, 65%-68% of irradiation-resistant particles, 1%-3.5% of an active agent, 1.2%-3.7% of an anti-aging agent, 3%-5% of a reinforcing agent, 0.8%-1.2% of a softening agent, 0%-0.2% of an accelerant and 0.5%-1.2% of a vulcanizing agent. Each radiation-resistant particle comprises a core layer, a middle layer and a shell layer, the core layer comprises lead tungstate and bismuth oxide, the middle layer comprises a biphenyl-nano SiO2 bonding body, and the shell layer comprises diphenyl acetylene grafted graphene oxide. By introducing the radiation-resistant particles with multiple structures and functional characteristics, the material performance stability of the anisotropic rubber in a radiation environment can be remarkably improved, so that the use requirements of the fields and scenes such as nuclear industry devices and the like are met.

The present invention discloses titanium-based solder alloy particles, a preparation method thereof, and a titanium cup brazing process, comprising the following steps: preparing a metal alloy according to a mass fraction, preparing the metal alloy into a powder by argon atomization, and screening the powder with a particle size of less than 200 mesh; preparing an organic intermediate according to a mass fraction; mixing the powder with the organic intermediate according to a mass fraction, with the powder accounting for 89-94 and the organic intermediate accounting for 6-11, and extruding into a welding rod with a diameter of 2-3 mm after sufficient stirring; drying the welding rod at 80°C under vacuum for 12 hours; cutting the welding rod into 2-3 mm welding particles to obtain titanium-based solder alloy particles. Beneficial effects of the present invention: The present invention provides titanium-based solder alloy particles, a preparation method thereof, and a titanium cup brazing process, which increases the brazing temperature of traditional solder to 1050 degrees, and the brazing temperature matches the crystallization temperature of the titanium material, so that the crystallization of the titanium cup and vacuum brazing can be integrated, which can reduce processing time, improve product qualification rate, and reduce production cost.

The invention relates to the technical field of steel production, in particular to a steel plate for an intermittent drive motor, which comprises the following chemical components in percentage by mass: less than or equal to 0.003% of C, 0.50-1.50% of Si, 0.5-1.5% of Mn, 0.02-0.06% of P, less than or equal to 0.001% of S, less than or equal to 0.002% of N, 0.05-0.15% of Mo and 0.20-1.00% of Als. And the balance of Fe and inevitable residual elements. The electromagnetic performance requirement can be met, the mechanical strength machining performance can be considered, the operation efficiency and reliability of the intermittent drive motor are improved, and the production cost is reduced.

The invention discloses a production method for improving the toughness of a hypereutectoid heat treatment steel rail, and belongs to the technical field of metallurgical materials. The steel rail comprises the following chemical components in percentage by mass: 0.80-1.10% of C; 0.30 to 0.90 percent of Si; mn is 0.55 to 2.25 percent; less than or equal to 0.025% of P; s is less than or equal to 0.025%; the alloy comprises the following components in percentage by weight: 0.20 to 0.90 percent of Cr, 0.04 to 0.30 percent of V, 0.03 to 0.10 percent of Nb and 0.0010 to 0.010 percent of RE; the total mass fraction of the Fe and the impurities is 100%. The production process comprises the following steps: a steelmaking production process: adding a rare earth alloy at a VD station; a steel rail rolling process; an online heat treatment process; and tempering. The invention aims to research parameters of different temperatures, cooling speeds, tempering processes and the like of the steel rail, improve the toughness of the heat-treated hypereutectoid steel rail and ensure the strength of the heat-treated hypereutectoid steel rail.

The invention discloses a polishing method and system for controlling LTV at a marking hole of a SiC wafer, and relates to the technical field of semiconductor manufacturing. A polishing solution is adopted to carry out chemical mechanical polishing on the SiC wafer with the laser marking hole under the polishing process parameters; the polishing solution comprises a KMnO4 oxidizing agent with the mass fraction of 10% + / -3% and a mixed grinding material of Al2O3 and CeO2, the particle size of the Al2O3 grinding material is 250-350 nm, the particle size of the CeO2 grinding material is 80-120 nm, the mass ratio of Al2O3 to CeO2 is 1: 1, the mass fraction of Al2O3 and CeO2 in the polishing solution is 5%-6%, and the polishing solution is maintained to be acidic. The material removal rate of the marking hole area and the material removal rate of the wafer body area are highly consistent, the SiC wafer surface with the ultrahigh flatness is obtained, local thickness changes, caused by laser marking, around the marking hole are restrained, and the overall quality and yield of SiC wafer manufacturing are improved.

The application discloses a slow-release composite for water treatment, which is prepared by mixing and pressing raw materials including aggregate, sodium silicate, pore-forming agent, slow-release carrier, low-melting-point organic matter and adhesive agent, wherein the aggregate is 10-40 parts, the sodium silicate is 2-5 parts, the pore-forming agent is 10-60 parts, the slow-release carrier is 10-40 parts, the low-melting-point organic matter is 1-3 parts, the adhesive agent is 5-15 parts, and the water is 1-3 parts in terms of mass fraction. The slow-release composite prepared by the application has high strength and can slowly decompose in water, and the release speed is controllable; the slow-release composite releases the functional components loaded in the interior to stabilize the concentration of microorganisms and trace elements in water and improve the quality of the water environment. The loading amount of the functional components in the slow-release composite prepared by the application can reach 5-30%, and the slow-release period can be 10-100 days; different functional components and contents and different slow-release periods can be selected according to the requirements of different water environments to achieve the purpose of adjusting the water environment.

The invention provides an alloy material, the surface of the alloy material is provided with a nitriding layer, and the thickness of an area, with the atomic percentage content of nitrogen being larger than or equal to 1 at.%, in the nitriding layer is 1-20 microns; in addition, the mass fraction of the nitrogen element in the nitride layer in the alloy material is larger than or equal to 0.1 wt.% and smaller than or equal to 0.5 wt.%. The alloy material is excellent in mechanical property.

The present application relates to a kind of anti-crack glass composition, anti-crack glass and its preparation method and application.The anti-crack glass composition includes SiO2, Al2O3, Li2O, Na2O, K2O, MgO, Y2O3 and ZrO2 in oxide form;With the total mass of anti-crack glass composition as 100wt%, the mass fraction of Al2O3 is 16wt%-21wt%, the mass fraction of Li2O is 2wt%-6.5wt%, the mass fraction of Na2O is 0.5wt%-4wt%, the mass fraction of K2O is 1wt%-4wt%, the mass fraction of MgO is 1wt%-5wt%, the mass fraction of Y2O3 is 2wt%-7wt%, the mass fraction of ZrO2 is 0.5wt%-3.5wt%, and the balance is SiO2.The anti-crack glass prepared by the anti-crack glass composition of the present application has high drop height resistance and excellent drop resistance.

The invention belongs to the technical field of manufacturing of low-alloy high-strength steel, and discloses a production method for normalizing and rolling a Q355MPa thick plate, which is energy-saving, efficient and excellent in performance. Comprising the following steps that smelting and continuous casting are conducted to obtain a steel billet meeting set chemical components, and the steel billet comprises, by mass, 0.16%-0.18% of C, 0.2%-0.4% of Si, 1.4%-1.5% of Mn, 0.04%-0.05% of Nb, 0.04%-0.05% of V, 0.01%-0.03% of Ti and the balance Fe and inevitable impurities, P is smaller than or equal to 0.015%, and S is smaller than or equal to 0.005%; the steel billet is heated to the soaking zone temperature of 1200 + / -20 DEG C, and the heating time t is equal to (8-11 min) / 10 mm; the steel billet is subjected to two-stage rolling to form a steel plate, the initial rolling temperature of rough rolling ranges from 1050 DEG C to 1100 DEG C, the initial rolling temperature of finish rolling ranges from 810 DEG C to 830 DEG C, the final rolling temperature ranges from 780 DEG C to 820 DEG C, and the total reduction rate is larger than or equal to 70%; and rapid cooling is carried out within 10 seconds after finish rolling, so that the surface temperature of the steel plate is reduced to 680-720 DEG C, and then air cooling is carried out to the room temperature.

This invention belongs to the field of aluminum alloy materials technology, and relates to a high-strength and ductile aluminum alloy and its preparation method. The alloy comprises, by mass fraction: 2-6% Mg, 0.4-0.9% Mn, 0.2-0.6% Si, 0.05-0.15% Sn, Fe≤0.15%, Ti≤0.1%, with the balance being Al. By introducing Sn, a low-melting-point MgSiSn primary phase is formed in the as-cast stage, and transforms from a continuous network to a discontinuous granular structure during homogenization heat treatment, weakening the adverse effects of brittle intermetallic compounds at grain boundaries. Simultaneously, Sn dissolved in the aluminum matrix forms a nanoscale MgSiSn precipitate during homogenization, serving as a heterogeneous nucleation core for the Mn-containing second phase, lowering its nucleation energy barrier, and promoting high-density, fine, and uniform precipitation, thereby achieving a synergistic improvement in the alloy's strength and ductility.

The present application belongs to the technical field of bridge engineering repair materials, and particularly relates to a kind of cement joint repair materials, preparation method and application.The repair material comprises component A and component B;component A comprises epoxy resin, modified epoxy polymer, ester diluent, surfactant and defoaming agent;component B comprises composite amine curing agent, modified rubber elastomer, accelerator and coupling agent;the mass ratio of component A and component B is 100:(30-35) by mass fraction.The dual toughening mechanism of modified epoxy polymer and modified rubber elastomer is adopted, the elongation of the material after curing is greater than or equal to 50%, which can adapt to the joint deformation caused by bridge dynamic load and avoid secondary cracking caused by rigid curing.The interfacial bonding strength between the repair material and concrete is high, the split tensile strength of the cement joint is greater than or equal to 3.0MPa, cohesive failure is realized, and the integration of the repair layer and the matrix is ensured.

A method for manufacturing an evaporator core, characterized in that the method comprises the following steps: Providing a ceramic aggregate, a filler, a pore former, and a sintering aid, and mixing to obtain a mixture, wherein the ceramic aggregate has a material purity of chemically pure, analytically pure, and ultrapure, wherein the filler has a material purity of chemically pure, analytically pure, and ultrapure, and wherein the filler comprises at least one of calcium oxide, magnesium oxide, and zinc oxide, and wherein, if the filler comprises calcium oxide, magnesium oxide, and zinc oxide, the mass fraction ratio of the calcium oxide, magnesium oxide, and zinc oxide is (1-3):(1-3):(1-3); Providing a binder and mixing the mixture with the binder to obtain a ceramic material, wherein the binder comprises at least two of paraffin, beeswax, stearic acid, polyethylene and ethylene-vinyl acetate copolymer; Providing a heating element and manufacturing an evaporator core blank from the heating element and the ceramic material; Sintering the evaporator core blank to obtain the evaporator core.