212 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 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 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 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 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 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 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 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 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.

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.

The invention relates to the technical field of ceramics, in particular to glazed foamed ceramic and bubble art glaze thereof. The oxide is prepared from the following chemical components in percentage by mass: 56 + / -2% of silicon dioxide, 9.0 + / -0.5% of aluminum oxide, 8.0 + / -1% of calcium oxide, 3.5 + / -1% of magnesium oxide, 5.5 + / -1% of zinc oxide, 12.0 + / -1% of potassium oxide, 3.5 + / -1% of sodium oxide, 2.5 + / -0.5% of diboron trioxide and 0-1.5% of colored metal oxide. The foaming agent raw materials comprise high-temperature decomposition type carbonate and high-temperature reaction type silicon carbide or silicon-oxygen-carbon. The glaze surface is devitrified, opacifying and matte, the carbonate foaming agent is completely decomposed and escaped on the glaze surface in the early stage to form a rough and uneven effect, silicon carbide or silicon-oxygen-carbon reacts in an oxidizing atmosphere at 1025 + / -25 DEG C to generate foaming gas, the foaming gas is matched with a boron element, and the temperature is rapidly increased to the highest firing temperature to promote glaze bubbles to break through the glaze surface to form open bubbles.

The invention relates to a method for rapidly and accurately determining the content of tin in tin bronze by using ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry), which comprises the following steps: taking A grams of tin bronze, adding B milliliters of concentrated hydrochloric acid and C milliliters of hydrogen peroxide, and dissolving the tin bronze; after supplementing D milliliters of concentrated hydrochloric acid, adding water to fix the volume to V milliliters to obtain a sample solution with the volume fraction of hydrochloric acid being E%; mixing B milliliters of concentrated hydrochloric acid and C milliliters of hydrogen peroxide, supplementing D milliliters of concentrated hydrochloric acid, and adding water to fix the volume to V milliliters to obtain a blank solution with the volume fraction of hydrochloric acid being E%; measuring the sample solution and the blank solution by using ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry), and calculating the mass concentration rho1 of the sample solution and the mass concentration rho0 of the blank solution in combination with a tin standard solution working curve; based on the volume V of the sample solution, the mass A g of the tin bronze, the mass concentration rho1 of the sample solution and the mass concentration rho0 of the blank solution, the mass fraction of tin in the tin bronze is calculated. The method can improve the accuracy of the test result and the test speed.

This invention relates to the field of polymer materials technology, specifically to a low-dielectric LCP composite material, its preparation method, and its applications. The low-dielectric LCP composite material comprises the following raw materials in the indicated mass fractions: 70-95% LCP, 5-30% low-dielectric filler, 1-5% surface modifier, 0.1-1% antioxidant, and 0.1-1% lubricant. This LCP composite material exhibits excellent low dielectric constant, low dielectric loss, mechanical properties, and thermal stability, and can be applied to high-frequency electronic components.

The application discloses a preparation method of a comprehensive sample for accounting for element carbon content of coal, obtains particle sizes of each sample for measuring element carbon content of coal, parameter information of corresponding coal into a furnace of each sample and weight of each sample in an air dry state, calculates calibrated air dry base moisture of each sample according to the parameter information of the corresponding coal into the furnace of each sample and the weight of each sample in the air dry state, further calculates air dry base conversion sample amount of raw coal of the corresponding coal into the furnace of each sample, calculates mass fraction of each sample when the comprehensive sample is combined according to the air dry base conversion sample amount of the raw coal of the corresponding coal into the furnace of each sample, combines each sample according to the mass fraction of each sample when the comprehensive sample is combined, and obtains the comprehensive sample. The application determines a method for combining a proportion of the comprehensive sample for accounting for element carbon content of coal, has high practical applicability, a simple calculation process, accurate results and high practical application value, and provides a basis for accurately accounting for element carbon content of coal.

The application discloses a granulated powder with high saturation performance for inductance and a preparation method, and relates to the technical field of electronic components. The composite powder is composed of 40-60 parts of FeSiCr coarse powder, 25-35 parts of FeSi / amorphous fine powder and 5-15 parts of carbonyl iron powder in terms of mass fraction. The particle size of the FeSiCr coarse powder is 45-75 microns, the particle size of the FeSi / amorphous fine powder is 5-15 microns, and the particle size of the carbonyl iron powder is 1-3 microns. The ternary multi-particle size grading of the FeSiCr coarse powder, the FeSi / amorphous fine powder and the carbonyl iron powder is combined with the inert atmosphere protection mixing process, so that the powder oxidation is effectively inhibited, the effective performance retention rate of the magnetic powder is greater than or equal to 96%, the industrial problem that a single soft magnetic powder cannot simultaneously consider high saturation current and low high-frequency loss is solved from the powder material formula level, the saturation current of the magnetic core is increased by more than 15% than that of a single commercially available FeSiCr powder, the high-frequency loss is reduced by more than 20%, and the fluctuation deviation of the wide-frequency permeability is less than or equal to 5%.

The application discloses a kind of high-damping Fe-Mn series alloy materials, the component of alloy and the mass fraction of each component are as follows: Mn 16.5-17.5%, doping metal 0.5-0.8%, TiB2 0.02-0.03%, C0.01-0.015%, Si 0.015-0.02%, Fe remainder.The high-damping Fe-Mn series alloy material provided by the application, by optimizing the composition of alloy material and improving the process, using the method of combination of forging, stage solid solution and stage aging, the Fe-Mn series alloy material prepared has the comprehensive performance of high damping, high strength and good toughness;Add specific ratio of Ni, Zr, Mo doping metal and a small amount of TiB2, wherein, Ni improves the stacking fault energy, stabilizes austenite and solid solution strengthening, Zr and Mo form intermetallic compound to carry out precipitation strengthening and refine grain, TiB2 promotes grain refinement, C and Si affect the strength, plasticity and processing performance of alloy, synergistic effect of each element, the balance of high damping, high strength and good low-temperature toughness of Fe-Mn series alloy is realized.

The application discloses a 1000MPa-grade ultra-high-strength steel and a preparation method thereof, and relates to the technical field of steel smelting and rolling, wherein the chemical components of the ultra-high-strength steel include, in mass fraction, C: 0.15%-0.20%, Si: 0.30%-0.45%, Mn: 1.5%-2.0%, P: ≤0.008%, S: 0.006%-0.012%, Alt: 0.025%-0.040%, Ni: 0.08%-0.15%, Mo: 0.20%-0.50%, Cu: 0.20%-0.35%, Sb: 0.05%-0.10%, Nb: 0.03%-0.06%, and the balance of Fe and inevitable impurities. The method comprises the following steps: obtaining molten steel after smelting; continuously casting the molten steel to obtain a slab; heating and insulating the slab, and then performing hot rolling, coiling, pickling, continuous annealing and skin passing to obtain the 1000MPa-grade ultra-high-strength steel for resisting hydrochloric acid corrosion; and the ultra-high-strength steel prepared by the method has a yield strength of ≥980MPa, a tensile strength of ≥1000MPa, an elongation A50 of ≥9%, a structure of tempered martensite and a small amount of ferrite structure, and meets 180-degree d=2a forming without cracking; compared with a conventional 980MS, the corrosion resistance to hydrochloric acid is improved by more than 85%, and the hydrogen embrittlement sensitivity index is improved by more than 40%; and the pipe made of the ultra-high-strength steel meets 10%-20% hydrochloric acid pickling for 10-20 minutes without cracking.

The invention discloses a gangue concrete filling material ratio improving method based on a multi-objective optimization algorithm, which comprises the following steps: step 1, determining raw material composition and key influence factors of a gangue concrete filling material, step 2, carrying out test design and performance test based on RSM-BBD, the method comprises the following steps of 1, establishing a multi-objective optimization model, 2, establishing a quadratic polynomial regression model and carrying out reliability analysis, 3, determining a multi-objective optimization objective, a constraint condition and an optimization algorithm, 5, solving the multi-objective optimization algorithm and screening an optimal ratio, 6, carrying out performance verification and engineering application of the optimal ratio, and 7, carrying out dynamic updating and iteration of an optimization model. According to the method, the RSM-BBD test design and the multi-objective optimization algorithm are fused, the comprehensive influence and interaction of the mass fraction of the rubber material, the mixing amount of the alkali activator and the mass fraction of the solid material on the bleeding rate, the strength and the slump of the filling material are comprehensively considered, the limitation of a traditional single-factor experiment method is overcome, and the scientificity and the reliability of a matching optimization result are improved.

Embodiments of the present application provide a martensitic steel and a preparation method therefor, a structural member, and a terminal device. The martensitic steel provided in the embodiments of the present application comprises the Ni element, the Co element, the Mo element, the Nb element, the C element, the Fe element and other trace elements; on the basis of the total mass of the martensitic steel, the mass fraction of the Ni element is 14%-16%, the mass fraction of the Co element is 16%-18%, the mass fraction of the Mo element is 7%-10%, the mass fraction of the Nb element is 0.1%-0.6%, and the mass fraction of the C element is 0.003%-0.1%. On the basis of the element selection of the martensitic steel and the design of the content of each element, the martensitic steel can be prepared by means of a powder molding process such as metal injection molding, and the martensitic steel prepared by means of the described process can have high strength, good toughness, and a preset shape.

The invention discloses an automatic slurry solid-phase particle screening method which comprises the following steps: setting the temperature of drying equipment, the drying duration and parameters of screening vibration equipment, and completing weighing reference calibration; after slurry to be detected is guided into the sample separation mechanism, the slurry is separated into a detection sample and a redundant sample according to a preset proportion through multi-channel interval flow separation treatment; introducing water flow into the detection sample to form uniform slurry flow; the uniform slurry flow is guided into a grading screening mechanism, multi-stage gradient screening is achieved through the vibration effect, and all stages of screened solid-phase particles are subjected to hot air circulation drying and precise weighing; based on the weighing data, correcting the precise mass fraction of the particles in each stage of particle size interval by adopting the particle size interval, synchronously and quantitatively evaluating the detection precision, generating a particle size grading report, and feeding back the report to a production control system; the problem of poor representativeness of traditional sample separation is solved; the sample separation requirements of high-concentration and low-concentration slurry are met; the particle mass fraction can be accurately calculated, and the detection precision can be quantitatively evaluated.

The application relates to the technical field of composite material analysis, and discloses an online thermal analysis method and system for composite materials and a storage medium, which comprises multi-physical field coupling modeling, a thermal response coupling model containing solid-gas phase interaction is constructed, a correlation relationship between parameters and temperature and decomposition reaction progress is established, spatial discretization is carried out by using the Galerkin method, a thermal response differential equation set is solved by using an implicit or explicit time stepping algorithm, temperature field distribution, mass loss and carbon layer formation data are obtained, the carbon layer formation standard is that the mass fraction of a matrix is reduced by 20%, the carbon layer thickness is calculated by mass loss, a mechanical property parameter model is established, and the residual strength after a fire is calculated, and a temperature-time curve, residual strength distribution and parameter sensitivity analysis report can be visually displayed on an online platform. The application realizes full-process analysis from thermal response simulation to residual strength evaluation, improves prediction accuracy, and reduces the application threshold.

The invention discloses a coal rock density calculation method, device and equipment. The method comprises the following steps: firstly, acquiring total rock mineral X diffraction experiment data, X-ray element data of target position coal rock, coal rock average porosity and coal rock average water saturation; obtaining the ash content mineral type of the coal rock according to the total rock mineral X diffraction experiment data; calculating the type of the ash mineral and the mass fraction of the organic matter mineral by utilizing the mass fraction of the characteristic element in the ash mineral and the X-ray element data; calculating the skeleton density of the coal rock by using the mineral density of the coal rock, the ash content mineral type and the mass fraction of the organic matter mineral; and calculating the density data of the coal rock at the target position by using the average porosity of the coal rock, the average water saturation of the coal rock and the skeleton density of the coal rock. In the process, after X-ray element data is obtained on a drilling site, a series of element calculation is carried out, the density data of the coal rock at the target position can be obtained, the calculation method is simple, and the requirement for timeliness while drilling is met.

The application provides a kind of straw returning to field with self-hardening broken blade steel and its preparation method, and belongs to the field of steel preparation.The broken blade steel chemical composition includes C, Si, Mn, Cr, Ni, Mo, Nb, Ti, V, B and Fe; wherein, the content of C is 0.30%~0.55%, the content of Si is 0.15%~0.25%, the content of Mn is 0.45%~0.75%, the content of Cr is 0.85%~2.0%, the content of Ni is 3.0%~4.5%, the content of Mo is 0.4%~1.2%, the content of Nb is 0.01%~0.060%, the content of Ti is 0.015%~0.03%, the content of V is 0.3%~0.9%, and the content of B is 0.002%~0.005% by mass fraction.By limiting the addition of C, Si and Mn to improve the tensile strength of steel, adding Ti and Nb elements for fine-grain strengthening and second phase particle precipitation strengthening, adding B and Cr elements to improve the hardenability of steel, adding Ni to improve the toughness of steel, adding Mo element to improve the ability of anti-tempering brittleness, and adding V element to ensure hardenability at local high temperature, the metallographic structure of the steel is obtained in the form of lath martensite, thereby improving the performance of the broken blade.

The present application provides an alloy material. The surface of the alloy material is provided with a nitrided layer. A thickness of a region of the nitrided layer in which the atomic percentage of nitrogen is greater than or equal to 1 at% is 1-20 μm. In addition, the mass fraction of nitrogen in the nitrided layer in the alloy material is greater than or equal to 0.1 wt%, and less than or equal to 0.5 wt%. The alloy material has excellent mechanical properties.

The invention relates to a welding wire and a welding method, and belongs to the technical field of welding. The welding wire comprises the following chemical components: C, Mn, Ni, Cr, Si, Mo, a matrix element Fe and inevitable impurities. X = [Cr] + [Mo] + 1.5 [Si], y = [Ni] + 30 [C] + 0.5 [Mn], and in the formula, [Cr], [Mo], [Si], [Ni], [C] and [Mn] represent mass fractions of corresponding elements in the welding wire respectively; wherein x and y simultaneously meet the following three inequalities: 0.15 < = x < = 0.25,-0.777 x + 0.25 < = y < =-0.777 x + 0.4, and y > = 1.103 x-0. 083.