140 results about "Atomic ratio" patented technology

The invention belongs to the field of photocatalytic materials, and particularly relates to a high-entropy sulfide and a preparation method and application thereof. The high-entropy sulfide is granular, the molecular general formula is (MnaFebCocCudZe) xS, x is equal to 1, and the atomic ratio of Mn to Fe to Co to Cu to Zn is a: b: c: d: e of (1-2): (1-2): (1-2): (1-2): (1-2): (1-2): (1-2). The preparation method comprises the following steps: S1, dissolving metal salt in a mixed solvent of isopropanol and glycerol according to the atomic ratio of metal elements, and carrying out solvothermal reaction to obtain a precursor; and S2, dispersing the precursor in ethanol, adding thioacetamide as a sulfur source, and carrying out solvothermal reaction to obtain the high-entropy sulfide. The high-entropy sulfide disclosed by the invention is used as a photocatalytic material and shows excellent photocatalytic performance.

The invention relates to the technical field of high-entropy alloys, in particular to a Fe-Cr-Co-Ni-Al eutectic high-entropy alloy and a preparation method thereof. And for the FeaCrbCocNidAle eutectic high-entropy alloy with a = 1, b = 1, c = 1, d = 2.1 and e = 1, the mechanical property of the FeaCrbCocNidAle eutectic high-entropy alloy needs to be further improved so as to meet the requirement of strong plasticity matching. In order to solve the technical problems, the Fe-Cr-Co-Ni-Al eutectic high-entropy alloy is provided, the chemical components of the alloy are designed and expressed as FeaCrbCocNidAle according to the atomic ratio, a is 49, b is larger than or equal to 25 and smaller than or equal to 30, c is 9.8, d is larger than or equal to 5 and smaller than or equal to 15, e is 2, a + b + c + d + e is 100, Fe49Cr28.4 Co9.8 Ni10.8 Al2 is the eutectic high-entropy alloy, the yield strength is 612 MPa, the tensile strength is 823 MPa, the elongation at break is 25.1%, and the strength and plasticity matching is good. The problem that an existing high-entropy alloy is poor in strength and plasticity matching is solved.

The invention discloses a design method and a preparation method of low-melting-point high-entropy liquid metal GaInSnBiZn, and belongs to the field of alloy research and development. The liquid metal alloy is formed by mixing five metal elements including Ga, In, Sn, Bi and Zn according to the equal atomic proportion, and aims at avoiding formation of intermetallic compounds and optimizing the microstructure through the high-entropy effect, and low melting point, high stability and good mechanical property of the alloy are achieved. The mixing enthalpy of the binary alloy and the formation enthalpy of the ternary alloy are calculated, thermodynamic analysis and phase diagram research are combined, the proportion of the five elements is determined, the high-entropy alloy is prepared through a vacuum arc melting method under the high vacuum condition, and the high purity and stability of the high-entropy alloy are ensured. The liquid alloy is low in melting point and high in stability, theoretical guidance and technical support are provided for design and preparation methods of novel liquid metal materials, some limitations in the prior art are overcome, and the liquid alloy has high practical application value.

The invention relates to a rare earth modified AB2 type solid hydrogen storage alloy and a batch preparation method thereof, belongs to the technical field of hydrogen storage alloy materials, and solves the problems of high activation condition, long activation period, overhigh hydrogen absorption platform pressure, high batch preparation smelting difficulty, low yield, unstable product quality and the like of the traditional Ti-Mn series hydrogen storage alloy in the prior art. The specific composition of the hydrogen storage alloy is Ti < 1.1-x-y > Y < x > Zr < y > Mn < 2.0-y-z-m > Cr < z > Ni < m > Co < n >, x, y, z, m and n in the formula are atomic ratios, x is larger than or equal to 0.01 and smaller than or equal to 0.04, y is larger than or equal to 0.10 and smaller than or equal to 0.35, z is larger than or equal to 0.45 and smaller than or equal to 0.70, m is larger than or equal to 0.1 and smaller than or equal to 0.2, and n is larger than or equal to 0.05 and smaller than or equal to 0.15. The hydrogen storage alloy has good activation performance and hydrogen absorption and desorption performance, the hydrogen storage capacity is larger than or equal to 1.86 wt.%, and the hydrogen absorption and desorption platform pressure can be adjusted according to application requirements; under the conditions that the temperature is 20 DEG C and the initial hydrogen pressure is 3 MPa, activation can be completed through one-time hydrogen absorption and desorption circulation; after 200 times of hydrogen absorption and desorption cycles, the capacity retention ratio of the alloy is gt; and 98%. The invention further provides a preparation method of the hydrogen storage alloy, the method has the advantages of being simple and easy to operate, high in yield, stable in product quality and the like, and the problem of component segregation of a casting process is fundamentally solved.

The invention relates to application and a preparation method of a nano nitride dispersion strengthened nickel-based superalloy, and belongs to the technical field of superalloy materials. The alloy comprises the following components in percentage by mass: 50.0 to 55.0 percent of Ni, 21.0 to 35.0 percent of Cr, 3.5 to 5.5 percent of Nb, 3.0 to 5.0 percent of Mo, 1.0 to 3.0 percent of Co, 0.3 to 1.1 percent of Al, 0.6 to 2.2 percent of Ti, 0.1 to 0.3 percent of Si, 0.01 to 1.0 percent of rare earth element (RE), 0.01 to 0.05 percent of C, 0.01 to 0.15 percent of N, 0.002 to 0.020 percent of B and the balance of Fe and impurities. By regulating and controlling the RE / N atomic ratio (1: 1-2: 3) and the Ti / Al ratio (1.5-2: 1) and combining selective laser melting (SLM) 3D printing and a multi-stage heat treatment process in a nitrogen-containing atmosphere, nanoscale rare earth nitride particles with the average size of 1-10 nm and the number density of 1 * 10 < 22 >-3 * 10 < 24 > m <-3 > are generated in an alloy matrix, and gradient distribution is formed at a gamma phase interface and a grain boundary (the surface density is 20-50% higher than that of the interior). The yield strength of the alloy at 750 DEG C reaches 1150-1260 MPa, the creep life is prolonged by 2-10 times compared with that of a traditional alloy, the use temperature upper limit is improved by 50-100 DEG C, and the alloy is suitable for high-temperature parts such as aero-engine turbine discs and combustion chambers and has high strength, long service life and oxidation resistance.

The invention belongs to the technical field of analysis of single particles, and particularly discloses a method for detecting the atomic number ratio of multiple elements in a single particle in a nano material, which can synchronously collect ion signals of all the elements in the single particle, accurately measure the intensity of each element in a transient signal, and improve the detection accuracy. A novel data processing method, namely a statistical distribution fitting method, is adopted, so that the real and accurate multi-element atomic ratio is calculated, and the inherent defects of the traditional SP-ICP-MS and TEM technologies are overcome; meanwhile, the problem that part of nano-particles are unstable in a water phase is solved through an organic phase oxygen adding and sampling method.

The invention belongs to the technical field of metal materials and preparation thereof, and particularly provides a Nb-rich high-entropy alloy and a preparation method thereof. The atomic percent expression of the high-entropy alloy is NBaZrbTicVd, a is larger than or equal to 35 and smaller than or equal to 55 at%, b is larger than or equal to 15 and smaller than or equal to 22 at%, c is larger than or equal to 15 and smaller than or equal to 22 at%, d is larger than or equal to 15 and smaller than or equal to 26 at%, b = c = d, a + b + c + d = 100, the high-entropy alloy is composed of a single BCC phase, the microstructure is a typical dendritic structure, the tensile strength of the high-entropy alloy is 965-1079 MPa, and the elongation at break is 12.3%-27.6%. According to the method, the problem of poor room-temperature plasticity of the equal-atomic-ratio NbZrTiV high-entropy alloy is solved by increasing the content of the Nb element, collaborative optimization of room-temperature strength and plasticity is achieved, and the method is simple in process and suitable for industrial production.

The present invention discloses a crystalline aluminosilicate small-pore zeolite having a maximum ring size of eight tetrahedral atoms, wherein the zeolite comprises copper, wherein the Cu: Al atomic ratio is between 0.12 and 0.55; and manganese, wherein the Mn: Cu atomic ratio is between 0.05 and 0.95; and a metal M, wherein M is selected from magnesium, calcium, barium, strontium, yttrium, titanium, zirconium, niobium, iron, zinc, silver, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and mixtures thereof, and wherein the M: Cu atomic ratio is between 0.05 and 0.80; and wherein the sum of the atomic ratios of copper, manganese and the metal M to aluminum, (Cu+Mn+M): Al, is between 0.20 and 0.80; and wherein the zeolite comprises at least 2.5 wt.-% of copper, calculated as CuO and based on the total weight of the zeolite. Catalyst substrate monoliths comprising the crystalline aluminosilicate zeolite are also disclosed. These catalyst substrate monoliths can be used in a process for the removal of nitrogen oxides from combustion exhaust gases, and they can be part of emissions treatment systems.

This invention relates to a high-strength, high-hardness, lightweight, high-entropy alloy and its preparation method, specifically to a high-strength, high-hardness, lightweight, high-entropy alloy and its preparation method. The aim is to address the insufficient room-temperature strength and hardness of existing as-cast lightweight high-entropy alloys. The formula for this lightweight high-entropy alloy is (AlNbTiVCr). 100‑x B x Preparation method: 1. Weigh the raw materials according to the atomic ratio expressed in the formula; 2. Place the raw materials on the crucible of a vacuum non-consumable arc furnace; 3. Before melting, turn on the circulating cooling water, and separately place sponge titanium and aluminum particles in the crucible. After evacuating the vacuum, under the protection of an inert gas, first melt the sponge titanium and aluminum particles, and then melt (AlNbTiVCr) with different cobalt contents in sequence. 100‑x B x After melting, the ingot sample is cooled to obtain a button ingot sample; fourth, the button ingot sample is repeatedly melted and cooled to obtain a lightweight high-entropy alloy. This invention is used to prepare lightweight high-entropy alloys.

The present application relates to a zirconium-rich Cr-Zr-N alloy coating, a coated product, a use, and a preparation method. The Cr-Zr-N alloy coating contains a Cr-Zr-N alloy material having the chemical formula of (CrxZryNz)Ma, wherein M is a doping element, x, y, z, and a are each independently an atomic ratio, 15.0≤x≤53.8, 30.0≤y≤78.8, 6.2≤z≤35.5, and 0≤a / (x+y+z+a)≤0.05.

The invention provides a method for calculating the oxidation rate of low-melting-point metal (Bi) by using a Raman spectrum. By controlling the sintering temperature of the metal Bi and using the Raman spectrum peak ratio, the oxidation rates of the metal Bi at different temperatures are calculated. Through contrastive analysis, the result is consistent with the results of differential thermal thermogravimetry, X-ray diffraction analysis and the oxidation rate of the atomic ratio of a scanning electron microscope, but Raman spectrum analysis is simpler, more convenient and more accurate. The method is mainly applicable to the field of material detection and analysis.

A catalyst used for converting a heavy hydrocarbon, wherein the catalyst includes an extrudate having a co-mulled mixture of an inorganic oxide; and at least one metal from Group VIB and at least one metal from Group VIII of the Periodic Table of Elements. An atomic ratio of the at least one metal from Group VIII to the at least one metal from Group VIB is in the range of from 0.0 to 0.3, and the catalyst has a pore structure such that 15 vol.% to 25 vol.% of the total pore volume is present in pores of a diameter greater than 1,000 A and a surface area of that is greater than 150 square meters (m2) / gram (g) and less than 240 m2 / g.

To provide a sputtering target capable of favorably suppressing occurrence of cracks and fractures during a manufacturing process.SOLUTION: A sputtering target having (1) Fe, (2) Pt, (3) one or more elements selected from Ag, Au, B, Co, Cr, Cu, Ga, Ge, Mn, Mo, Nb, Ni, Pd, Re, Rh, Ru, Si, Sn, Ta, W, V, and Zn, and (4) the remainder, the atomic ratio between (1) Fe and (2) Pt being 34-55 at%, the total concentration of (1) Fe and (2) Pt being 50 mol% or above, the total content of the elements (3) being 0.5-15 mol%, the remainder (4) being an oxide and optionally including impurities, the volume ratio of the oxide being 40 vol.% or more, and a number-average equivalent circle diameter, calculated on the assumption that the shape of the oxide in the oxide phase is a circle and calculated using ImageJ using an SEM image having a visual field magnification of 3000, of 1.3 μm or less.SELECTED DRAWING: Figure 1

This invention relates to a coated cutting tool having at least one rake face and at least one flank face and a cutting edge therebetween. The coated cutting tool comprises a substrate and a coating comprising a (Ti,Al)N layer. The (Ti,Al)N layer is a single monolayer or a multilayer of two or more alternating (Ti,Al)N sublayers with different compositions. The total atomic ratio of the (Ti,Al)N layer, Al / (Ti+Al), is >0.67 but ≤0.85. The (Ti,Al)N layer exhibits a plane strain modulus distribution along a direction perpendicular to the cutting edge on the rake face and / or the flank face. The plane strain modulus at a point 0.5 mm away from the cutting edge is greater than 85% of the plane strain modulus at the cutting edge, and the plane strain modulus at the cutting edge is ≥450 GPa.

Provided is a catalyst metal particle containing Rh as a main component that can improve catalytic activity and a catalyst containing the catalyst metal particle. The catalyst metal particle according to the present disclosures includes a composition in terms of atomic ratio represented by the formula RhxIryPtz, wherein x+y+z=100, 40≤x≤80, 10≤y≤40, and 10≤z≤40.

A coated cutting tool is provided with a hard coating film on a base material. The hard coating film is composed of a nitride or carbonitride containing 50 at% to 70 at% (inclusive) of Al, 20 at% to 50 at% (inclusive) of Cr, and 4 at% to 15 at% (inclusive) of Si with respect to the total amount of metal including semimetal. The atomic ratio (at%) A of a metal element including a semimetal and the atomic ratio (at%) B of nitrogen in the hard coating satisfy 1.07 lt; b / Alt; 1.30, 1.30. The hard coating film exhibits a maximum peak intensity caused by a (200) plane or a (111) plane of a cubic crystal in an intensity distribution determined from an X-ray diffraction pattern or a selected area diffraction pattern of a transmission electron microscope, and does not have a peak mainly composed of a hexagonal crystal in the intensity distribution determined from the selected area diffraction pattern.

An alloy for a hydrogen-resistant member to be used in a hydrogen-resistant member having resistance to hydrogen embrittlement comprises a fundamental component composed of one or more iron group elements, and a low-hydrogen-affinity component composed of one or more metal elements of a metal element group having a lower affinity for hydrogen than the iron group elements. The average value of the enthalpy of mixing with hydrogen, which is calculated based on the enthalpy of mixing with hydrogen and atomic ratio of each of all metal elements contained in the chemical composition of the alloy for a hydrogen-resistant member, is −20 [kJ / mol] or greater.

The invention belongs to the field of selenium compounds, and particularly relates to a layered Cu2Se material and a preparation method and application thereof. The layered Cu2Se material comprises two layers of selenium and a Se-Cu-Se repeating layer unit formed by copper located between the two layers of selenium, wherein the atomic ratio of Cu to Se in the Se-Cu-Se repeating layer unit is 2: 1; and the Se-Cu-Se repeating layer units are repeatedly arranged in the thickness direction. According to the layered Cu2Se material, Se-Cu-Se is taken as a repeated layer unit, and layers are combined together by Van der Waals force, so that a layered quasi-two-dimensional structure with crystal preferred orientation is formed. The lamellar quasi-two-dimensional structure is relatively low in stripping energy and is about easy to strip, and Se becomes unstable after stripping, so that two-dimensional copper can be prepared.

The invention discloses an in-situ generated high-entropy particle reinforced magnesium-based composite material and a preparation method thereof, the composite material comprises Mg, Y, Dy, Ho and Er elements, the atomic ratio of Mg / Y + Dy + Ho + Er is greater than 10: 1, and the atomic ratio of Y to Dy to Ho to Er is 1: 1: 1: 1. The atomic ratio of Mg / Y + Dy + Ho + Er is larger than 10: 1, the atomic ratio of Y, Dy, Ho and Er is 1: 1: 1: 1: 1, Mg24 (Y0.25 Dy0.25 Ho0.25 Er0.25) 5 high-entropy particles can be generated after rare earth atoms are subjected to solid solution, the high-entropy particles serving as reinforcements have high strength and high hardness, and the strength and hardness of the composite material can be remarkably improved; meanwhile, in-situ synthesized Mg24 (Y0. 25Dy0. 25Ho0. 25Er0. 25) 5 high-entropy particles and an Mg matrix form a coherent interface, dislocation can be extended, plastic deformation of the material is coordinated, and when the room temperature of the prepared composite material is 25 DEG C, the yield strength is 212 MPa, the tensile strength is 361 MPa, the Vickers hardness is 107 Hv, and the ductility is 10.6%; the high-entropy particle reinforced Mg-based composite material is generated in situ, so that the room-temperature strength and ductility of the alloy can be synergistically improved.

This invention relates to the field of alloy materials and metallurgical processing technology, and discloses an alloy, its preparation method, and its uses. The alloy comprises the following components by mass percentage: Ni: 22.0–28.0%; Al: 3.0–5.0%; Mn: 1.0–3.5%; Fe: 0.2–1.5%; Cr: 0.1–0.8%; Si: 0.05–0.30%; Ti: 0.05–0.50%; Zr: 0.02–0.20%; the balance being Cu and unavoidable impurities, and the atomic ratio of Ni to Al in the alloy is 2.6–3.3. The tensile strength, yield strength, and elongation of the alloy at room temperature are significantly improved.

This surface-treated steel material has a steel material and a plating layer containing Zn formed on at least a portion of the surface of the steel material, and when the portion of the surface of the steel material where the plating layer is not formed is considered to be the non-plated portion, a compound containing Zn and Mg is present in at least a portion of the non-plated portion, and at the center of a first region, which is the center between a first boundary and a second boundary in the thickness direction, the atomic ratio of Mg to Zn, Mg / Zn, is 0.090 or more, and at the center of a second region, which is the center between the second boundary and the surface of the compound in the thickness direction, the atomic ratio of Mg to Zn, Mg / Zn, is less than 0.090.

The application discloses a catalyst for preparing acrylonitrile through propylene ammoxidation and a preparation method and application thereof. An active component of the catalyst comprises La, Q and R, R is at least one of Ce, Pr, Nd, Sm and Eu elements, and Q is at least one of Zr, Ca, Ti and P elements; an atomic ratio of the La to the R is 0.05-0.45, and an atomic ratio of the Q / (La+R) is 0.01-0.25. When the catalyst is used for preparing acrylonitrile through propylene ammoxidation, the catalyst has the characteristics of high activity and low two-carbon yield in a long-period running process.

The invention aims at providing a preparation method and application of a Pt-N-C catalyst with the N atomic ratio of pyridine to pyrrole being 1 / 1, and belongs to the technical field of electro-catalytic materials and alkaline electrolytic water hydrogen production. ZIF-8 and ZIF-67 serve as precursors, the proportion of Zn / Co is adjusted, then pyrolysis is conducted at the temperature of 920 DEG C in the H2 / Ar atmosphere, the reaction that H2 and C are hydrogenated into methane at the high temperature is utilized, and the Pt-N-C catalyst with the N atomic ratio of pyridine to pyrrole being 1 / 1 is obtained. According to the method, pyrrole N (N5) and pyridine N (N6) are used as raw materials, carbon ring reconstruction is catalyzed by means of Co nanoparticles (Con) generated in situ, the proportion of pyrrole N (N5) to pyridine N (N6) is close to 1: 1, Pt single atoms are anchored through N coordination, and the Con-Pt1 (at) N [5] / [6] C catalyst is prepared. The catalyst has high activity and high stability, the overpotential is as low as 17 mV and is superior to that of commercial Pt / C, and the catalyst can stably run for 400 hours under the conditions of 70 DEG C and 1A / cm in an anion exchange membrane water electrolyzer (AEMWE).

The present invention provides a composite particle that can achieve both high silicon utilization and oxidation inhibition during water dispersion. The composite particle of the present invention is a composite particle having a particle containing carbon material and silicon, and a coating layer containing carbon and oxygen on the surface of the particle, and has a true density of 1.80 to 1.99 g / cm 3 In the Raman spectrum, a peak exists at 450 to 495 cm ‑1 If the intensity of the peak is I Si , and the intensity of the G band is I G , then I Si / I G is 1.3 or less, and in X-ray photoelectron spectroscopy, if the atomic ratios of Si, O, and C are A Si , A O , and A C , and the ratios of SiO2 and SiO are B SiO2 , B SiO , then A Si is 0.05 or more, and I Si / I G and A C / (A C +A Si ×(B SiO2 +B SiO )) have a prescribed relationship.

A magnetic powder contains Sm, Zr, Fe, B, and N. An atomic ratio of a content of Zr to a sum of a content of Sm and the content of Zr is greater than 0.10 and smaller than 0.30. A content of B is greater than 0.0 atom% and smaller than 0.4 atom%.

Catalyst comprising an active phase comprising copper and a Group IIIA element and an alumina support, the copper content being between 0.5 and 25 wt%, based on copper element, relative to the total weight of the catalyst, the atomic ratio of copper to Group IIIA element being between 1 and 50 mol / mol, characterized in that the support is provided in the form of beads or extrudate having a specific surface area between 10 and 250 m2 / g.

The invention provides a CoCrNi-based high-entropy alloy material and a preparation method of the CoCrNi-based high-entropy alloy material. The chemical expression of the CoCrNi-based high-entropy alloy material is as follows: (CoCrNi) (100-x-y) Al < x > Ti < y >, wherein the atomic ratios of Co, Cr and Ni are the same, the value of x is more than or equal to 5 and less than or equal to 10, and the value of y is more than or equal to 5 and less than or equal to 10. According to the CoCrNi-based high-entropy alloy material, Al and Ti are introduced into the CoCrNi-based high-entropy alloy material, and an FCC + L12 + BCC + B2 four-phase heterostructure is formed by accurately regulating and controlling the content of Al and Ti elements and the type, particle size and distribution of a precipitated phase. The L12 precipitated phase size of the (CoCrNi) 90Al5Ti5 alloy is about dozens of nm; along with the increase of the contents of Al and Ti, the size of an L12 precipitated phase is gradually reduced. The CoCrNi-based high-entropy alloy material is high in yield strength, low in alloy corrosion current density and good in ductility.

A cemented carbide in a non-limiting embodiment of the present disclosure includes a hard phase including W and C, a binding phase including one or more kinds of iron group metals, and a condensed phase including Zr and Nb in which Nb / (Zr+Nb) in terms of atomic ratio is less than 0.38. A coated tool in a non-limiting embodiment of the present disclosure includes the cemented carbide and a coating layer located on a surface of the cemented carbide. A cutting tool in a non-limiting embodiment of the present disclosure includes a holder that extends from a first end toward a second end and includes a pocket on a side of the first end, and the coated tool located in the pocket.

The invention provides a Ti8AlSn-based alloy and a preparation method thereof, the alloy is a titanium-based intermetallic compound material taking a Ti8AlSn phase as a matrix, and the alloy comprises the following components in percentage by atom: 5%-15% of Al, 5%-15% of Sn and the balance of Ti and inevitable impurity elements. The Ti8AlSn phase is an ordered phase of a close-packed hexagonal structure, and the atomic ratio of Ti to Al to Sn is 8: 1: 1. The preparation method of the alloy comprises the steps of raw material preparation, vacuum consumable smelting and heat treatment. After the alloy prepared according to the design concept is subjected to heat treatment, the room-temperature hardness value of a matrix is not lower than 420 HV.

To provide a cutting tool that exhibits excellent resistance to wear and to chipping in machining stainless steel and the like.SOLUTION: A surface-coated cutting tool provided with a laminated structure having an average thickness within a range of 0.5 μm or more to 10.0 μm or less, the laminated structure being composed of alternately laminated A layers each having an average thickness of 2 nm or more and less than 50 nm and B layers each having an average thickness of 2 nm or more and less than 50 nm, wherein the A layer is constituted by an (Al1-x-yCrxMey)N (x: 0.20≤x≤0.59 in atomic ratio, y: 0.01≤y≤0.30 in atomic ratio, Me: at least one element selected from Nb, Mo, Ta, and W), and the B layer is constituted by a (Ti1-zSiz)N layer (z: 0.01≤z≤0.40 in atomic ratio).SELECTED DRAWING: Figure 1