21 results about "Chromium atom" patented technology

The present invention provides a heterogeneous micro-rib membrane and a preparation method thereof, comprising a front and a back surface, wherein the front surface is provided with a vortex generator array and a rib array, wherein the vortex generator array is arranged in series with the rib array, wherein the vortex generator array includes a plurality of flatly arranged vortex generators, and the rib array includes a plurality of flatly arranged ribs. From the front surface to the back surface, the membrane comprises a first protective layer, a second protective layer, a support layer, a backing layer, and a bottom film layer, wherein the first protective layer is made of a super-hydrophobic modified material, the second protective layer is formed by argon ion bombardment of a chromium target and deposition of chromium atoms, the support layer is made of an epoxy resin material, and the backing layer is prepared by corona treating the surface of the support layer and applying glue; the bottom film layer is removable. The heterogeneous micro-rib membrane provided by the present invention has high overall strength, wear resistance, corrosion resistance, and significant drag reduction effect.

The invention discloses chromium-doped iron selenide and a preparation method and application thereof.The preparation method comprises the steps that organic mercaptan for dissolving selenium is injected into an organic amine solution for dissolving an iron source, and reaction is conducted in the inert gas atmosphere; and adding a chromium source, continuously reacting, and collecting a solid product after the reaction is finished. The three-dimensional'urchin-like 'chromium-doped iron selenide microspheres are synthesized by utilizing a heteroatom doping strategy, and a sample is subjected to electrochemical catalysis application. The electronic structure of the FeSe2 catalyst is effectively adjusted by doping the chromium atoms, so that the material generates lattice distortion, more active sites are exposed, and the catalytic efficiency of the FeSe2 catalyst is improved; the microspheres are formed by assembling one-dimensional nanorods with uniform sizes, have a relatively large specific surface area and are beneficial to rapid diffusion of an electrolyte and smooth escape of bubbles, so that the microspheres have excellent electro-catalytic water decomposition performance. The preparation steps are simple, and the method has the characteristics of short synthesis time, uniform morphology, high flexibility and the like.

[Problem] To provide a polarizing plate, a polarizing plate, a polarizing plate with an optical layer, an image display panel, and an image display device capable of suppressing a change in hue of the polarizing plate in a high-temperature environment. [Solution] A polarizer (1) is formed from a polyvinyl alcohol-based resin film and contains potassium atoms and at least one type of atom selected from the group A below, and the total content of the at least one type of atom selected from the group A below as determined by elemental analysis is 0.10 mass% or more. The atom is bonded to the hydroxyl group of the polyvinyl alcohol, thereby suppressing a dehydration reaction and further suppressing polyenation. Group A: atoms belonging to alkali metals (except potassium atoms), atoms belonging to alkaline earth metals, aluminum atoms, and chromium atoms.

A display substrate according to an embodiment includes a substrate including chromium and iron, wherein the substrate includes a surface portion defined as a depth region of 5 nm depth in a thickness direction from a surface of the substrate, and a central portion, and a ratio of chromium atoms to iron atoms (Cr / Fe) of the surface portion is greater than a ratio of chromium atoms to iron atoms (Cr / Fe) of the central portion.

This cemented carbide includes a first phase containing tungsten carbide particles, a second phase containing at least one of a carbide of vanadium and a carbide of chromium, and a third phase containing nickel or cobalt. The ratio MW of the number of tungsten atoms to the number of atoms constituting the first phase, the second phase and the third phase, the ratio MV of the number of vanadium atoms to the number of atoms constituting the first phase, the second phase, and the third phase, and the ratio MCr of the number of chromium atoms to the number of atoms constituting the first phase, the second phase, and the third phase satisfy the relationship (MV / MW) / (NV / NW)+(MCr / MW) / (NCr / NW)>1.

A lead wire for a nonaqueous electrolyte battery according to the present disclosure is provided with: a conductor; and one or more layers of insulating films that cover at least a portion of the outer peripheral surface of the conductor, the conductor having a conductor coating that covers at least a portion of the surface, the conductor coating containing a metal element and a trivalent chromium compound containing chromium hydroxide, the ratio of the number of chromium atoms contained in the chromium hydroxide to the number of chromium atoms contained in the trivalent chromium compound in the outermost surface of the conductor coating film is 0.40-0.85, and the insulating film has an innermost layer laminated on the surface of the conductor coating film. The innermost layer is mainly composed of a resin component containing maleic anhydride-modified polypropylene, and the acid modification rate of the resin component is 0.02 mass% or more and 0.50 mass% or less.

The invention belongs to the technical field of resistance alloys, and particularly relates to a chromium-silicon resistance alloy and a preparation method thereof. According to the method, the CrSi2 alloy and the chromium powder serve as raw materials, mechanical alloying and vacuum heat treatment are adopted, the CrSi2 alloy and the chromium powder are subjected to ball milling and mixing and then subjected to heat treatment, so that chromium atoms are diffused into a CrSi2 phase, a solid diffusion reaction is carried out, the chromium-silicon proportion in the chromium-silicon alloy is flexibly regulated and controlled by regulating and controlling the CrSi2 alloy and the chromium powder, and the chromium-silicon alloy is prepared. And various chromium-silicon resistance alloys with different atomic ratios from silicon-rich to chromium-rich are prepared. The prepared chromium-silicon resistance alloy material can be applied to the fields of precision resistors and the like.

The invention relates to the technical field of chromium plating layers, in particular to a preparation method of a wear-resistant heterogeneous pure chromium plating layer. The method comprises the following steps: performing surface treatment on a workpiece and pure chromium powder; dispersing the treated pure chromium powder in the electroplating solution by adopting an ultrasonic method to form an electroplating solution colloid; the workpiece is connected with a cathode of a direct-current power supply to serve as an electroplating cathode plate, the lead-tin alloy plate is connected with an anode of the direct-current power supply to serve as an electroplating anode plate, and the electroplating cathode plate and the electroplating anode plate are arranged in the electroplating liquid colloid to form an electroplating loop; starting a direct-current power supply, and preparing an isomerous pure chromium plating layer by utilizing deposition; and hydrogen removal treatment is conducted on the deposited workpiece. According to the method, the heterogeneous pure chromium plating layer is prepared through deposition, chromium atoms are continuously deposited, a freely-growing chromium matrix is in a low-energy state, the defect density of grown chromium crystals is very low, meanwhile, chromium particles are consistent with the plating layer in component, have affinity and wettability with the chromium matrix, and can form colloidal suspension in a plating solution, so that the chromium particles are not prone to falling off. And the obtained heterogeneous pure chromium plating layer has relatively high wear resistance.

The invention discloses a preparation method and application of a chromium-doped fullerene C20 catalyst. According to the invention, fullerene C20 is used as a carrier, chromium atoms are efficiently introduced into a carbon cage structure of fullerene C20 through chemical doping, and a stable active center with a strong electron coupling effect is successfully constructed. The method specifically comprises the following steps: dispersing fullerene C20 in toluene, carrying out ultrasonic treatment, adding chromium trichloride, carrying out a doping reaction under nitrogen protection, and carrying out centrifugation, washing and drying to obtain the target catalyst. The catalyst shows excellent performance in the reaction of catalyzing carbon dioxide hydrogenation to prepare formic acid, under the mild condition, the highest carbon dioxide conversion rate can reach 90.2%, the highest formic acid yield can reach 92.6%, and the catalytic activity retention rate is still 91.7% or above after the catalyst is recycled five times. The process is simple, the prepared catalyst has the advantages of high activity, high selectivity and high stability, and a new material is provided for efficient resource utilization of carbon dioxide.

This disclosure relates to a low-carbon alkane catalyst, its preparation method, and its application. The catalyst includes an alumina support and an active component and an auxiliary component supported on the alumina support. The active component includes chromium oxide, and the auxiliary component includes an oxide containing a first metal element and an oxide containing a second metal element. The first metal element includes one or more elements from Group IIIA and / or Group IVB; the second metal element includes any two or more elements from Group VIII, Group IB, Group IIB, Group IIIB, and Group VIIB. The catalyst of this disclosure incorporates specific metal elements, controls the ratio of chromium atoms to the first metal element and the second metal element in the catalyst to be 1:(0.05~2):(0.05~2), and controls the calcination temperature during the preparation process to be between 780 and 1000 °C. o C, to achieve the Cr species in chromium oxides in the catalyst. 3+ Cr 6+ The peak area ratio is 0.6~9, which improves the catalyst activity and the yield of dehydrogenation of low-carbon alkanes to olefins.

The present invention provides a member which makes is possible to obtain excellent residue defect inhibition properties and excellent bridge defect inhibition properties of a chemical liquid in a case where the member is brought into contact with the chemical liquid. The present invention also provides a container, a chemical liquid storage body, a reactor, a distillation column, a filter unit, a storage tank, a pipe line, and a chemical liquid manufacturing method. The member according to an embodiment of the present invention is a member that will be brought into contact with a chemical liquid. A surface of the member is constituted with stainless steel containing chromium atoms and iron atoms. In a case where an atomic ratio of the chromium atoms to the iron atoms is measured from the surface of the member to a position 10 nm below the surface in a depth direction, a maximum value of the atomic ratio is found in a region extending 3 nm from the surface of the member in the depth direction. The maximum value is 0.5 to 3.0, and an average surface roughness of the surface of the member is equal to or lower than 10 nm.

The invention relates to the technical field of material surface treatment, in particular to a salt bath chromium plating method for the surface of diamond powder. By adopting a composite chloride system with magnesium chloride as a main component and alkali metal chloride as an auxiliary component, a low-melting-point co-melt can be formed in the salt bath chromium plating process, the melting point can be reduced to 700 DEG C or below, the process temperature of salt bath chromium plating is remarkably reduced, meanwhile, the molten salt flowability is optimized, and the salt bath chromium plating quality is improved. It is ensured that chromium atoms are evenly diffused in the fused salt and chemically react with carbon atoms on the surface of the diamond to generate a uniform and compact chromium carbide layer, and heat damage to the diamond is effectively avoided; the chlorate powder is low in cost, easy to obtain and free of toxicity, harmful substances cannot be generated in the salt bath chromium plating process, the environmental protection property is good, the bottlenecks of high temperature, high consumption and uneven plating of traditional salt bath chromium plating are broken through, a low-cost and high-reliability surface modification technology is provided for the diamond / metal composite material, and the application prospect is wide. And the large-scale application of the diamond in the fields of electronic packaging and thermal management is directly promoted.

A cubic boron nitride sintered material includes: 70 volume % or more and 99 volume % or less of a cubic boron nitride grains; and a binder, wherein the binder includes a first compound including chromium, cobalt and carbon, tungsten carbide, cobalt, and aluminum, and in the first compound, a ratio NCr / (NCr+NCo) of the number NCr of atoms of the chromium to a sum of the number NCr of the atoms of the chromium and the number NCo of atoms of the cobalt is 0.10 or more and 0.90 or less.

Provided is a cubic boron nitride sintered compact comprising cubic boron nitride particles in the amount of 70-99 vol%, and a binder. The binder comprises: a first compound containing chromium, cobalt, and carbon; tungsten carbide; cobalt; and aluminum. In the first compound, the ratio NCr / (NCr+NCo) of the number of chromium atoms NCr to the total of the number of chromium atoms NCr and the number of cobalt atoms NCo is 0.10-0.90.

A nickel-based alloy for forming a sealing ring (224) is disclosed. Such a seal ring (224) may be static or rotating in use, and may be used in a variety of applications, such as in a wheel assembly (108) for a machine (100). Using this alloy, a seal ring can be manufactured using a centrifugal casting process. The disclosed alloys include a chromium content greater than at least 13.5 wt%, a boron content less than 3 wt%, a carbon content less than 2 wt%, and a nickel content greater than 70 wt%. The nickel alloy may have a carbon plus boron atom content divided by a chromium atom content of less than 1.1. This alloy allows for rapid cooling of centrifugal casting while maintaining grain morphology suitable for relatively low leakage and relatively high durability. The sealing ring (224) is formed by centrifugal casting when the alloy is formulated.

A photomask blank having a substrate; and a multilayer film including a first layer, a second layer, and a third layer. The first layer contains 43 at % or less chromium, 32 at % or more oxygen, 25 at % or less nitrogen and 5 at % or more and 18 at % or less carbon and has a thickness of 8 nm or more and 16 nm or less. The second layer contains 66 at % or more and 92 at % or less chromium and 8 at % or more and 30 at % or less nitrogen and has a thickness of 50 nm or more and 75 nm or less. The third layer contains 44 at % or less chromium, 30 at % or more oxygen and 28 at % or less nitrogen and has a thickness of 10 nm or less. A surface roughness Rq of the multilayer film is 0.65 nm or less.

The invention relates to the technical field of power generation boiler metal material application, and discloses an oxide skin inhibition method and application of high-chromium heat-resistant steel for a boiler high-temperature steam pipeline, and the oxide skin inhibition method comprises the following steps: optimally designing alloy components, taking the high-chromium heat-resistant steel as a base material, and adding specific alloy elements to form a synergistic effect, for example, chromium forms a continuous chromium-rich layer; cobalt promotes chromium atom migration to form a double-layer structure, copper improves thermal expansion matching performance, and niobium hinders oxygen ion diffusion; the service environment is dynamically regulated and controlled, adaptive steel types are selected according to the service temperature, steam parameters are controlled, and an oxidation film is monitored and repaired in real time; and an oxide layer forming and repairing process, wherein surface strengthening and steam banking treatment are combined. Starting from the material, the oxide skin grading control scheme is provided, material-working condition-maintenance three-in-one regulation and control are achieved, steam banking and online shot blasting are combined, the maintenance cost is reduced, Co / Cu alloying design is adopted, the traditional material bottleneck is broken through, and long-period operation of a high-temperature pipeline is guaranteed.

The present invention relates to a method and product for eliminating primary carbides in bearing steel. The method comprises the following steps: radially searching for a position with a certain number of primary carbides in the bearing steel sample as a sampling position; sampling the bearing steel at the sampling position to obtain a test sample; applying a gradient pulse current to the test sample; after the primary carbides are eliminated, stopping the application of the gradient pulse current and cooling the test sample to room temperature. The present invention can completely eliminate primary carbides in a short period of time. Specifically, the Joule heat effect and electromigration effect generated by the pulse current jointly promote the diffusion of vacancies left after the carbides are eliminated, so that it has a much larger vacancy flux than the traditional high-temperature diffusion method, so that the chromium atoms that restrict the dissolution of the primary carbides are quickly redistributed between the carbides and the matrix, saving processing time and avoiding the inheritance of uneven tissue in subsequent processing.

To provide a polarizer capable of suppressing a hue change of the polarizer under a high temperature environment.SOLUTION: The polarizer 1 is formed of a polyvinyl alcohol-based resin film, contains potassium atoms and at least one kind of atoms selected from the following group A, and has a total content of the at least one kind of atoms selected from the following group A determined by elemental analysis of 0.10% by mass or more. When the atom is bonded to a hydroxy group of the polyvinyl alcohol, a dehydration reaction is suppressed, and thus polyene formation is suppressed. An atom belonging to an alkali metal (excluding a potassium atom), an atom belonging to an alkaline earth metal, an aluminum atom, and a chromium atom SELECTED DRAWING: Figure 1

The application discloses a kind of full same chromium atomic cluster and its self-assembly method and application, comprising the following steps: preparation Cr x NbSe2 Single crystal;Fix the single crystal to the sample holder, and fix the ceramic rod on the surface of the single crystal far from the sample holder on one side, place the assembled sample in an ultrahigh vacuum cavity, and impact the ceramic rod by external force to realize sample cleavage, then transfer the cleaved sample in situ to the scanning tunneling microscope cavity, and perform temperature reduction and surface morphology characterization. The application successfully realizes the self-assembly of large-area chromium atomic clusters by using single crystal cleavage technology, the cluster size is consistent and uniformly distributed, has extremely high chemical and structural stability, and the sample size can reach centimeter level, which lays a foundation for the application of magnetic atomic clusters in new generation semiconductor devices.

The invention relates to the technical field of film plating, in particular to a diamond surface diffusion chromium plating method. The preparation method comprises the following steps: mixing diamond powder with chromium powder to obtain mixed powder; the mixed powder is subjected to spark plasma sintering, the chromium element reacts and diffuses on the surfaces of the diamond particles, and a chromium coating with the composition of Cr3C2 is formed; the spark plasma sintering temperature ranges from 850 DEG C to 900 DEG C, the axial pressure ranges from 10 MPa to 40 MPa, and the heat preservation time ranges from 30 min to 90 min. According to the method, heat preservation is conducted in the SPS equipment, reaction diffusion of the chromium element on the surfaces of diamond particles is achieved, in the SPS sintering process, the mixed powder is under the combined action of a temperature field, a pressure field and a current field, the heat activation temperature needed by the diffusion reaction can be effectively reduced, the diffusion speed of chromium atoms to the surface layer of the diamond is increased, and the diffusion efficiency is improved. And graphitization of the diamond is effectively inhibited, and finally the uniform chromium plating layer which is good in quality and compactly combined with the diamond is obtained.