1190 results about "Chromium Alloys" patented technology

A spacing profile for a spacing frame, which is to be fitted in the edge area of a double-glazing unit, forming an interspace, with a profile body of a material possessing low thermal conductivity and with a diffusion-impermeable metal foil which is bonded to the profile body so as to establish a material fit, is characterized in that the metal foil is, at least on the surface facing away from the profile body, provided with a corrosion preventing coating which comprises a colored lacquer coating and/or a layer of chromium or of a chromium alloy, wherein the corrosion preventing coating comprises a thickness which is lower by at least a factor of 2.5, preferably by at least a factor of 10 and further preferred by at least a factor of 20, as compared to the thickness of the metal foil.

The present invention belongs to the technical field of air sterilizing and purification and in particular relates to a plasma air sterilizing and purifying device and an air sterilizing and purifying method. The plasma air sterilizing and purifying device comprises a plasma reactor, a pulse power supply, a fan component, a control device, a power adaptor, and a housing case, wherein the reactor is provided with positive electrodes formed by several nickel-chromium alloy wires or nickel-chromium alloy belts, and the two ends of each positive electrodes are fixed in the corresponding grooves on the micro-discharge preventive conductor rail; and a pulse power supply has a digital control circuit with an oscillator, an error amplifier and a PWM comparator inside which converts signals into a digital control current to control the width of the high-voltage pulse.

An etchant of the present invention includes an aqueous solution containing hydrochloric acid, nitric acid, and a cupric ion source. An etching method of the present invention includes bringing the etchant into contact with at least one metal selected from nickel, chromium, nickel-chromium alloys, and palladium. Another etching method of the present invention includes bringing a first etchant that includes an aqueous solution containing at least the following components A to C (A. hydrochloric acid; B. at least one compound selected from the following (a) to (c): (a) compounds with 7 or less carbon atoms, containing a sulfur atom(s) and at least one group selected from an amino group, an imino group, a carboxyl group, a carbonyl group, and a hydroxyl group; (b) thiazole; and (c) thiazole compounds; and C. a surfactant) into contact with a surface of the metal, and then bringing a second solution that includes an aqueous solution containing hydrochloric acid, nitric acid, and a cupric ion source into contact with the surface of the metal. According to the etchant and the etching methods of the present invention, it is possible to etch at least one metal selected from nickel, chromium, nickel-chromium alloys, and palladium quickly and suppress excessive dissolution of copper.

A magnetic recording medium, the order of layers in which is the substrate, the soft underlayer, the seedlayer, the 1^st RuCr_x-containing interlayer, the 2^nd RuCr_x-containing interlayer and the magnetic recording layer with preferably a oxides or nitrides-containing magnetic layer comprising grains, is disclosed. High-chromium ruthenium-chromium alloy used as inter layers significantly enhances coercivity and SMNR preferably due to the improved lattice match between RuCr inter layers and CoPt-based magnetic recording layers, and the surface energy of RuCr layers contributes to the performance improvement with the high-chromium addition into Ru inter layers.

The invention discloses a method for manufacturing a surfacing composite wear-resistant steel plate, which comprises the following steps of: tiling a steel base plate on a water-cooled platform, and compacting the steel base plate by employing front and rear side compaction devices respectively; after a weld pass is welded, opening the front and rear side compaction devices, and conveying the steel base plate for a certain distance forward through a pinch roll device; and repeating the steps for surfacing, until a flat surfacing composite wear-resistant steel plate with a high-chromium alloy wear-resistant layer is obtained on the whole steel base plate. A piece of equipment for manufacturing the surfacing composite wear-resistant steel plate applied to the method for manufacturing the surfacing composite wear-resistant steel plate comprises a portal frame, a welding device, a rear side compaction device, a front side compaction device, a water-cooled platform, a pinch roll device and a frame, wherein the rear side compaction device is arranged on the rear side of the welding device; and the front side compaction device is arranged on the front side of a welding gun of the welding device. The composite wear-resistant steel plate welded through the manufacturing method is small in deformation and high in welding quality and is not limited to specifications.

A dual mobility femoral head construct has a secure acetabular shell received within an acetabular recess formed in a pelvis. An implantable prosthetic device is implantable after a failure of an originally installed articular head insert of an acetabular cup assembly. A hemispherical liner is formed from a cast cobalt-chromium alloy for thinness and elasticity. At least three spacers are annularly displaced about an outer diameter of the hemispherical liner to define a uniform cement thickness with the secure acetabular shell. Web shaped depressions are formed circumferentially in the outer diameter of the hemispherical liner to receive cement to resist lever out forces and to secure the cement bond with the secure acetabular shell. A replacement articular head insert is then received for dual mobility rotational movement in an inner diameter of the hemispherical liner. A femoral head implant is received for articulating movement in the articular head insert.

The invention relates to an indirect extruding and casting method of a wrought aluminum alloy casting. The method comprises the following steps of: (a) preparing alloy, wherein the alloy comprises the following components in percentage by weight: 0.4-1.2 percent of Si, 0.2-0.9 percent of Cu, 0.8-1.4 percent of Mg, 0.02-0.4 percent of Cr and the balance of Al, the Si, the Cu and the Cr in the alloy are respectively added in the form of intermediate alloys of an aluminum-silicon alloy, an aluminum-copper alloy and an aluminum-chromium alloy, and the Mg and the Al are respectively added in the form of pure magnesium and pure aluminum; (b) alloy smelting: adding the pure aluminum and the intermediate alloys of the aluminum-silicon alloy, the aluminum-copper alloy and the aluminum-chromium alloy firstly, and after smelting, raising the temperature to 700-740 DEG C; adding a refining agent for refining, and then cooling to 680-700 DEG C; then adding the magnesium and adjusting the temperature to 720-740 DEG C to begin indirect extruding and casting; (c) carrying out the indirect extruding and casting, wherein the process has the following technological parameters: the pressure applied is 50-200MPa, the pressure maintaining time is 15-35s, the pouring temperature is 690-730 DEG C, and the temperature of a mould is 60-160 DEG C; (d) carrying out heat treatment, wherein the solid solution temperature is 515+/-5 DEG C, the solid solution time is 6-10h, the transferring time of the casting from discharging to water is 1-15s, and water cooling is carried at room temperature; carrying out primary aging immediately, wherein the aging temperature is (150-165)+/-5 DEG C, the aging time is 6-14h, and cooling is carried out in air; and carrying out secondary aging, wherein the temperature is (165-175)+/-5 DEG C, the aging time is 1-3h, and cooling is carried out in air.

A nickel-molybdenum-chromium alloy, capable of withstanding both strong oxidizing and strong reducing acid solutions, contains 20.0 to 23.5 wt. % molybdenum and 13.0 to 16.5 wt. % chromium with the balance being nickel plus impurities and residuals of elements used for control of oxygen and sulfur.

The invention discloses a production method of a high-strength, high-conductivity and heat-resistant copper alloy, and belongs to the technical field of copper alloy machining. Accoding to the production method of high-strength, high-conductivity and heat-resistant copper alloy, the inner liner of a crystallizer adopted in the upper-induced continuous casting process is a carbon-carbon composite material so as to ensure the lubrication, high heat conduction and high temperature resistance properties; the temperature of the upper-induced continuous casting is 1180-1230 DEG C, the casting temperature is low so that the problem that molten liquid in the crystallizer is difficult to solidify and the crystallizer inner liner is worn during casting can be effectively avoided; the pressure of protective gas nitrogen in the liquid surface of an upper-induced furnace is controlled to be 0.2-0.7 atmosphere, so that the phenomenon of solid-liquid interface separation in the crystallizer is avoided, and a copper-chromium alloy product with larger weight and length is produced; according to the production method of the high-strength, high-conductivity and heat-resistant copper alloy, the cheapelement (Mg) is used for replacing the rare noble metal, and the mechanical property and the softening resistance property of the copper-chromium alloy are improved; and the production method is a non-vacuum and short-process preparation technology, the cost is low, and the production method is suitable for large-scale industrial production and has important economic and social significances.

An ultra-thin copper foil with a carrier having a peeling layer able to withstand even high temperature working in the case of using a high heat resistant resin, enabling the carrier foil and the ultra-thin copper foil to be easily peeled apart, and reduced in the number of pinholes by uniform plating without impairing the peelability of the peeling layer, that is, an ultra-thin copper foil with a carrier comprised of a carrier foil, a peeling layer, and an ultra-thin copper foil, wherein the peeling layer and the ultra-thin copper foil are provided between them with a strike plating layer at the surface on the peeling layer side, an ultra-thin layer of copper is provided on this according to need, and an ultra-thin copper foil comprised of copper or a copper alloy or a phosphorus-containing copper or phosphorus-containing copper alloy is provided. The peeling layer between the carrier foil and the ultra-thin copper foil is chromium, a chromium alloy, a chromium-containing oxide hydrate layer, nickel, iron, or an alloy layer of the same or an oxide hydrate layer of the same.

The invention provides a seaming method for a ceramic sputtering target, which comprises the following steps: providing a back board and forming a soft solder layer with lower melting point solder on the surface of the back board; providing a ceramic sputtering target, and forming an interface layer on the surface by filming treatment of pure chromium or chromium alloy; carrying out annealing treatment on the ceramic sputtering target with the interface layer; and carrying out soft soldering joint on the solder layer of the back board and the interface layer of the target. In the invention, after the chromium or chromium alloy interface layer is formed on the ceramic sputtering target, and annealing treatment is carried out on the interface layer, excellent joint adhesive capacity is formed between the interface layer and the soft solder layer, thus the ceramic sputtering target and the back board are jointed more tightly.

An IDT electrode (3) on a piezoelectric substrate (2) has an electrode including first metal layers (31a, 31b) formed of titanium or a titanium alloy, or chromium or a chromium alloy and second metal layers (32a, 32b) formed of aluminum or an aluminum alloy, copper or a copper alloy, or gold or a gold alloy, which are laminated alternately. The orientation degrees in the first metal layer (31a) that is closest to the surface of the piezoelectric substrate (2) in the first metal layers (31a, 31b) and the second metal layer (32a) that is closest to the surface of the piezoelectric substrate (2) in the second metal layers (32a, 32b) are higher than the orientation degrees in the upper metal layers. As compared with the prior art where the orientation degrees in the first metal layers (31a, 31b) and the second metal layers (32a, 32b) are not considered, the power handling capability of the IDT electrode (3) can be significantly improved.

The invention discloses an intravascular stent of a composite structure; the intravascular stent comprises a stent main body, wherein the distal end of the stent is restrained as an adducted form by virtue of a tightening wire, and the tightening wire is degradable magnesium alloy or degradable iron alloy; one or more auxiliary wires are woven on the stent main body; when the stent is applied to blood vessel of brain, the auxiliary wire is pure platinum or alloy thereof, pure gold or alloy thereof, pure tungsten or alloy thereof, or pure tantalum or alloy thereof; and when the stent is applied to peripheral blood vessel, the auxiliary wire is cobalt-chromium alloy or stainless steel or tungsten or tantalum. The stent, when serving as a thrombus removal system for treating cerebral apoplexy, not only can be used for removing thrombus effectively for several times but also can be used for catching small thrombus flowing to distal end so as to prevent distal blood vessels from getting blocked; and the stent can be used for dilating stenosis or blocked brain blood vessel or peripheral blood vessel, so as to take an effect of dredging and reconstructing a blood flow. The stent can be repositioned and released, with high controllability; and the stent can be used for reducing operation difficulty and greatly improving an operation success rate.

The invention provides a preparation method of a hard alloy/high-chromium alloy-based wear-resistant composite material, which comprises the following steps: firstly manufacturing a hard alloy/enhancement body, welding an iron nail at one end of the hard alloy enhancement body, then plating a metal buffer layer on the surface of the hard alloy enhancement body welded with the iron nail, further manufacturing a wearable element model, further inserting the well prepared hard alloy into the wearable element model on the premise of enabling the iron nail to face towards outside, adopting the expendable pattern casting process to cast high-chromium alloy, taking out a cast after casting molding, cutting off the iron nail, using a diamond grinding wheel to polish the working surface to be smooth, and then performing heat treatment on a workpiece. The composite material is uniform in distribution of enhancement phase, large in controllable range of volume fraction, small in residual stress of an interface, small in heat-affected zone and good in combination, hard alloy of the composite material is positioned in the surface layer of the working surface of a wearable element, the thickness is 10-15mm, and the composite material can be used for manufacturing normal-temperature or high-temperature wear-resistant wearable elements in the fields of mines, building, metallurgy, electric power and the like.

The invention discloses iron-based alloy powder for the laser cladding of TRT (Blast Furnace Top Pressure Recovery Turbine Unit) parts. As for the powder, on the basis of an iron-nickel-chromium alloy, Mo, Nb, N and Si element strengthening matrixes are added, and the alloy melting point is reduced while the moderate hardness is kept, and the comprehensive properties such as high strength, abrasion resistance and the like are ensured, thus being convenient for laser cladding; and trace elements Ce and Hf are added to improve the crystal boundary quality, inhibit and prevent cracks, improve the heat stability and chemical stability of a cladding layer and endow the alloy with oxidation resistance, corrosion resistance and abrasion resistance under a higher temperature and wider application range. Failed parts made from carbon steel, structural steel, hardened and tempered steel, stainless steel, tool steel and other materials can be repaired by using the powder and combining the laser cladding technology, thus the powder has wide application prospects and obvious benefits.

The invention provides a method for smelting high-chromium steel, which comprises the steps of: primarily smelting molten iron in a rotating furnace; tapping molten steel after the primary smelting into a steel ladle, adding high carbon ferrochrome in the tapping progress, thus enabling Cr content in the molten steel to reach 1.8-2.4 wt%; refining the steel ladle by an LF furnace, adding low carbon ferrochrome in the steel ladle refining progress by the LF furnace, wherein, on the basis of addition amount of chromium, a weight ratio of the low carbon ferrochrome to the high carbon ferrochromeis (1: 2) to (1: 3.5); and carrying out RH vacuum refining upon molten steel after steel ladle refining by the LF furnace. The invention further provides high-chromium steel smelted by the method forsmelting the high-chromium steel disclosed by the invention. Through the technical proposal, the method disclosed by the invention fully considers the influence to temperature and carbon composition of the molten steel due to addition of chromium alloy, and is good for matching of production rhythm among working procedures, so that production can be carried out smoothly. In addition, through the method disclosed by the invention, yield of the chromium is high, and high-chromium steel with a higher Cr content is obtained in an economical manner.

The invention relates to a nano composite coating which sequentially consists of coatings A, B and C from bottom to top, wherein the coating A is metal Cr, metal Ti or titanium-chromium alloy; the coating B is TiAlN, CrAlN, TiAlSiN or ZrN and doped with one or more of rare earth elements La, Ce and Y; the coating C is Si3N4. By depositing the composite coating provided by the invention to a cutting tool, the wear resistance and the corrosion resistance of the cutting tool are greatly enhanced and the cutting tool has relatively high hardness and using temperature. The composite coating is stable in structure, good in binding force and long in service life, and the service life of the tool is further prolonged. The binding strength of the composite coating and a substrate is tested by using a scratch method and the result shows that the coating-substrate adhesion is improved by 30% or above. Compared with the TiAlN coated cutting tools sold on the market, the service life of the coated cutting tool provided by the invention is prolonged by 70% or above.

The invention provides a high-chromium alloy iron roll and a preparation method thereof. The roll is composed of a high-chromium alloy cast iron work layer and a nodular cast iron roll core. The work layer comprises the elements of, by mass percentage, 2.6-2.8% of C, 0.5-0.9% of Si, 0.3-0.8% of Mn, 20-22% of Cr, 0.6-1.5% of Ni, 0.2-0.3% of Mo, 0.2-0.4% of Cu, 0.001-0.003% of B, 0.1-0.6% of V, 0.01-0.03% of RE, less than 0.05% of P, less than 0.05% of S and the balance iron. The work layer and the roll core are compounded in a centrifugal machine casting mode, and the high-chromium alloy iron roll is prepared through sub-critical heat treatment. The high-chromium alloy iron roll has good abrasion resistance, tenacity and heat crack resistance, the service life of the roll is prolonged, the heat treatment temperature is low, and energy saving and environment protection are achieved.

A powder metallurgy method of making a chromium base alloy includes blending a first powder comprising a chromium powder and a second powder comprising at least one of titanium, titanium hydride, zirconium or zirconium hydride, annealing the first powder and the second powder in a reducing atmosphere after the step of mixing, compacting a blend of the first and the second powders, and sintering the compacted blend to form a chromium base alloy. The chromium alloy may be used as an interconnect for a solid oxide fuel cell, and includes least one of iron or nickel greater than zero and equal to or less than 7 weight percent, yttria greater than zero and equal to or less than 2 weight percent, at least one of titanium or zirconium greater than zero and equal to or less than 1 weight percent and at least 90 weight percent chromium.

The invention relates to the technical field of cold rolls, in particular to a preparation method for cold rolls of super hardness wide width double-zero aluminum foils. The method particularly comprises the following steps: firstly, carrying out anneal process on a blank roll which is made of high chromium alloy materials in a forged mode, then carrying out rough turning process, thermal refining, semi fine turning process and heat treatment, and finally carrying out fine turning process on the blank roll to repair a die until a finished product is obtained. According to the preparation method for the cold rolls of the super hardness wide width double-zero aluminum foils, the high chromium alloy materials and a four-pillar sunken downwards type double-power-frequency heat treatment technology are adopted, the cold rolls are manufactured through full numerical control four-area temperature-controlled liquid nitrogen processing cryogenic treatment, the hardness of roll bodies of the cold rolls can reach 102-104 HSD, the depth of a hardening layer is larger than or equal to 25mm, uniformity of the hardness is within HSD+/-0.5, length of roll faces exceeds 2300mm, high-grade wide width aluminum foils with width of the finished aluminum foils reaching 2300mm and thickness of 0.0065mm or below 0.0065mm can be rolled, and the preparation method is widely applied to industries such as cigarettes, food, medicine, electrons, photographic apparatuses and chemicals for daily use.

The invention relates to a production method for a high-compactness chromium alloy target, comprising the steps of vacuum degassing, periodic heating and pressurizing, pressure maintaining and furnace cooling, hot forging, annealing, hot rolling, annealing and machining which are sequentially performed, wherein chromium powder having a density of -200 meshes, a purity of greater than 99.95 wt% and an oxygen content of less than 1000 ppm, and an alloy metal powder are used as raw materials. Via the production method disclosed by the invention, the high-compactness chromium alloy target having uniform ingredients and density, a grain size of less than 100 microns, a purity of greater than 99.9%, a relative density of greater than 99% and an oxygen content of less than 1000 ppm can be successfully obtained. Additionally, the method disclosed by the invention is low in production cost, and the technical process is simple and easy to control.

The invention relates to a method for ultrasound-pulse electrodepositing of chromium and chromium alloy composite plating layer in a tervalent chromium plating bath system, pertaining to the technology of surface engineering and surface processing. The method comprises the pretreatment of to be plated articles and the ultrasound-pulse electrodepositing. By using the method, a Cr/SiC or Cr/SiO2 composite plating layer with 0 to 5.5 percent of composite particles, a Cr-Ni/SiC or Cr-Ni/SiO2 alloy composite plating layer with 0 to 3.9 percent of composite particles, and a Cr-Ni-Fe/SiC or Cr-Ni-Fe/SiO2 composite plating layer with 0 to 4.4 percent of composite particles can be obtained. The thickness of the composite plating layer can be thickened with the electrodepositing time, with the largest thickness of 18.26Mum. The composite plating layer is compact and smooth and can be well combined with the substrate, and has good wearing resistance and corrosion resistance.