422 results about "Nichrome" patented technology

The invention belongs to the field of nickel-based alloy materials, and discloses a precipitation hardening type nickel-based alloy welding wire and a preparation method thereof.The precipitation hardening type nickel-based alloy welding wire comprises, by mass, 50%-60% of nickel, 15%-20% of chromium, 15%-20% of iron, 2%-4% of molybdenum, 2%-5% of niobium, 0.01%-2% of tantalum, 0.2%-2% of aluminum, 0.5%-1.2% of titanium, 0.03%-0.08% of carbon, 0.1%-0.5% of manganese, 0.1%-0.5% of silicon, 0.01%-0.05% of magnesium, 0.01%-0.05% of yttrium, 0.5%-2% of tungsten, 0.1%-0.6% of cobalt, 0.001%-0.02% of boron and the balance impurities; according to the precipitation hardening type nickel-based alloy welding wire and the preparation method thereof, through component optimization and process innovation, the nickel-based alloy welding wire with high-temperature strength, excellent hot crack resistance and welding toughness is provided.

The invention provides an intermediate alloy for a high-temperature alloy and a preparation method of the intermediate alloy. The intermediate alloy for the high-temperature alloy comprises at least two of nickel, chromium and niobium as main elements, the content of N in gas impurity elements of the intermediate alloy for the high-temperature alloy is smaller than 0.01%, and the content of O in the gas impurity elements of the intermediate alloy for the high-temperature alloy is smaller than 0.1%. The intermediate alloy for the high-temperature alloy has the low melting point and the high purity, the components of the intermediate alloy are matched with mainstream high-temperature alloy components, the problem that in the adding process of niobium-containing raw materials and chromium-containing raw materials, the content of impurity elements is high is effectively solved, more excellent raw materials are provided for special metallurgy, and the production cost is reduced. And a wider window is provided for formulating a special metallurgy process.

The invention provides a plasma spraying high-temperature-erosion-resistant coating and a coating preparation method, and relates to the technical field of material surface treatment. Comprising the following components in parts by mass: 30-45 parts of tungsten carbide, 15-25 parts of chromium carbide-nickel-chromium alloy, 15-25 parts of yttria-stabilized zirconia, 5-10 parts of aluminum oxide-titanium dioxide composite ceramic, 10-20 parts of nickel-chromium-aluminum-yttrium alloy, 1-3 parts of nano aluminum oxide and 1-3 parts of lanthanum oxide. Multiphase collaborative design is adopted, tungsten carbide and chromium carbide-nickel-chromium alloy form double hard phases, the hardness is higher, aluminum oxide-titanium dioxide composite ceramic fills pores and improves compactness, rare earth and nanometer are adopted to cooperate, lanthanum oxide and nanometer aluminum oxide react to generate a LaAlO3 protective layer, oxidation weight gain is small, oxygen diffusion is inhibited, nanometer aluminum oxide refines grains, and the hardness is higher. In conclusion, the high-temperature oxidation resistance is high, and the erosion rate is low.

The invention relates to the technical field of packaging machines, in particular to an automatic strip jointing and continuous conveying device for a soft cotton towel bag making machine, which comprises a deviation correcting device and a strip, a first vertical plate is arranged at the rear end of the upper surface of the base, at least one material roll feeding device is arranged at the right end of the outer side face of the base, a baffle is installed at the position, close to the material roll feeding device, of the outer side face of the base, and a laser transmitter and a laser receiver are installed on the front side face and the upper surface of the baffle respectively. According to the automatic strip jointing and continuous conveying device for the soft cotton towel bag making machine, through the collaborative design of the electric heating laminating device and the material roll feeding device, automatic hot melting bonding of the ends of new and old material rolls is achieved; the first electric control telescopic rod drives the rectangular frame to press downwards, hot melting bonding is carried out on the end of the strip through electric heating of the nickel-chromium alloy strip, accurate alignment and press fit are completed in combination with the fifth rollers and the pressing plate which are symmetrically distributed, and manual repeated strip threading is not needed.

The invention relates to the technical field of coatings, in particular to a coating suitable for niobium-silicon alloy surface high-temperature protection and a preparation method of the coating. The coating comprises the following raw materials in parts by weight: 100-120 parts of deionized water, 60-80 parts of nickel-chromium-aluminum-yttrium alloy powder, 60-80 parts of enamel glaze, 50-60 parts of filler, 20-40 parts of a binder, 10-20 parts of nano titanium dioxide and 6-10 parts of an additive. According to the invention, during preparation of the coating, through addition of the filler, the negative thermal expansion performance of zirconium tungstate in the filler and volume shrinkage of zirconium tungstate in a high-temperature state, a buffer space is provided for thermal expansion of other materials in the coating, cracks of the coating due to thermal stress are avoided, and the high-temperature resistance of the coating is improved; kH560 enhances the interfacial compatibility of zirconium tungstate, avoids agglomeration of zirconium tungstate, and enables the zirconium tungstate to be more uniformly distributed in a coating system.

The invention discloses an ultrahigh-strength maraging steel wire as well as a preparation method and application thereof, and belongs to the field of steel product manufacturing. The steel wire alloy comprises the following components in percentage by weight: 0.02%-0.05% of C, 0.10%-0.35% of Si, 0.20%-0.60% of Mn, 0.60%-2.50% of Cr, 18.5%-22.0% of Ni, 8.0%-13.0% of Co, 1.2%-2.0% of Ti, 3.0%-5.5% of Mo, 0.10%-0.50% of Al, less than or equal to 1.50% of Cu, less than or equal to 1.50% of Nb, less than or equal to 0.05% of V, less than or equal to 0.04% of N, less than or equal to 0.02% of La + Ce and the balance of Fe and inevitable impurity elements. And the equivalence ratio Nieq / Creq of nickel to chromium is greater than or equal to 1.80. The steel wire provided by the invention has ultrahigh strength, excellent toughness and plasticity, wear resistance, heat resistance, drawing performance and bending and twisting performance.

The invention discloses a smelting process of a nickel-chromium-iron-based alloy, which comprises the following steps of: smelting and pouring a cast ingot by adopting an EAF (Electric Arc Furnace)-LF (Ladle Furnace)-VOD (Vacuum Oxygen Decarburization) furnace-LF (Ladle Furnace)-die casting process route, carrying out VOD vacuum oxygen decarburization by utilizing coarse smelting molten steel obtained by full scrap steel smelting in the electric arc furnace, and using nitrogen in the LF furnace to replace nitrided chromium iron to increase nitrogen. The desulfurization and deoxidation control parameters of each furnace are optimized, and finally the yield of Cr is controlled to be 99% or above and the yield of C is controlled to be 0.025% or below through a VOD oxygen blowing decarburization model; according to an LF furnace nitrogen increasing model, the nitrogen content of molten steel is accurately controlled, meanwhile, oxygen in the molten steel is controlled to be 0.003% or below, other chemical components meet the standard requirements, and the problem that the nickel-chromium-iron-based alloy is smelted through an electric arc furnace, and key elements cannot be accurately controlled is solved.

The embodiment of the invention provides a plastic-coated steel pipe and a plastic coating process thereof, and relates to the technical field of plastic-coated steel pipes. The plastic-coated steel pipe comprises a steel pipe base body, a metal transition layer, an inner anticorrosive coating, a fiber reinforced winding layer and an outer protective coating are sequentially arranged on the outer surface of the steel pipe base body from inside to outside, and the metal transition layer is a nickel-chromium-aluminum-yttrium alloy layer and is formed on the surface of the steel pipe base body through a supersonic plasma spraying process. And the inner anticorrosive coating is formed by a mixture of bisphenol F type epoxy resin and novolac epoxy resin, and is doped with silicon nitride and zirconium oxide composite nanoparticles subjected to surface treatment. By arranging a multi-stage composite structure of the metal transition layer, the high-temperature-resistant anti-corrosion coating, the fiber reinforcement layer and the self-repairing outer layer and arranging the detachable heat insulation sheath, the interface bonding strength, heat resistance, mechanical damage resistance and corrosion resistance of the plastic-coated steel pipe are improved; and the service life of the composite material in high-temperature, strong-corrosion and complex construction environments is effectively prolonged.

The utility model belongs to the technical field of sealing equipment, particularly relates to food packaging production sealing equipment, and aims to solve the problems that an existing sealing device and an existing conveying belt are complex in matching and inconvenient to use and maintain subsequently, the following scheme is provided: the food packaging production sealing equipment comprises a support frame, and a first rotating shaft and a second rotating shaft are rotationally arranged in the support frame; transmission rollers are fixed to the surfaces of the first rotating shaft and the second rotating shaft correspondingly, and the surfaces of the two transmission rollers are in transmission connection with a conveying belt used for conveying packaging bags. A vertical frame is fixed to the side end of the supporting frame, a nickel-chromium electric heating flat belt used for sealing a packaging bag is arranged in the vertical frame, and a positioning assembly used for positioning the nickel-chromium electric heating flat belt is arranged in the vertical frame. A set of intermittent driving assemblies used for driving the conveying belt to conduct intermittent conveying are arranged in the supporting frame. According to the intermittent working mode, energy waste and mechanical abrasion caused by continuous sealing are effectively avoided, the production cost is reduced, the whole equipment is reasonable in structural design, all assemblies are tightly matched, and operation is easy and convenient.

The invention relates to the technical field of recycling of cast nickel-based high-temperature alloy return scraps, and particularly discloses a method for extracting valuable metals in high-temperature alloy return scraps through carbonylation metallurgy. Comprising the steps of sulfuration smelting of the return scrap, carbonylation nickel extraction of the return scrap, chlorination of the material after nickel extraction, and graded carbonylation tungsten, chromium and molybdenum extraction, and nickel, chromium, tungsten and molybdenum in the cast nickel-based high-temperature alloy return scrap can be prepared into high-purity metal products by utilizing the characteristic of high selectivity of the carbonylation process. The nickel-based high-temperature alloy tailings can be directly sold as products in the forms of nickel carbonyl, chromium carbonyl, tungsten carbonyl and molybdenum carbonyl, meanwhile, the enrichment of rare and precious metals in the nickel-based high-temperature alloy tailings is realized, CO gas and chlorine gas used in the extraction process can be recycled, and the process can ensure the product quality while saving the cost, and is suitable for industrial production. And the method has huge economic benefits and relatively high popularization and implementation values.

According to the preparation technology of the wide-temperature-range wear-resistant self-lubricating composite coating, a double-ceramic-layer structural system is adopted, the matching performance between the coating and a base body and the matching performance between the coatings are integrally improved, the oxidation resistance and the thermal cycle performance of the coatings are improved, and peeling of the coatings in the using process is reduced; nickel-chromium / chromium carbide is sprayed on the surface of a metal matrix through supersonic speed to serve as a wear-resistant coating bottom layer, lanthanum fluoride-containing nickel-chromium / chromium carbide is sprayed through supersonic speed flame to serve as a wear-resistant self-lubricating surface layer, the friction coefficient is reduced, the friction performance is improved, and it is guaranteed that the coating system has satisfactory coating thermal cycle performance. The method has the advantages that the matching property of the coating and a metal matrix is improved, the oxidation resistance of a wear-resistant coating system is improved, and the coating system is ensured to have good frictional wear performance and satisfactory thermal cycle performance of the coating. The service life of parts can be prolonged by 2-10 times, and the device can also be applied to other power machinery fields and has a very wide market prospect.

The invention discloses an ultralow-temperature high-toughness non-magnetic steel flux-cored wire for a controllable nuclear fusion device and a preparation method of the ultralow-temperature high-toughness non-magnetic steel flux-cored wire. A special stainless steel strip is adopted to wrap a metal powder type flux core, and the flux core accounts for 29.6%-30.4% of the total mass of the flux-cored wire; the flux core comprises the following components: 14%-18% of electrolytic manganese, 21%-23% of chromium metal, 0.3%-1.0% of ferrotitanium, 4.4%-5.0% of nitrided ferrochromium, 27.5%-28.5% of nickel powder, 0.5%-1.0% of 52 # ferrosilicon, 8%-9% of molybdenum powder, 0.1%-0.3% of lithium fluoride and the balance of atomized iron powder. The problems that an existing non-magnetic steel welding material is insufficient in toughness and high in magnetic conductivity at the ultralow temperature of-269 DEG C are solved by optimizing flux-cored alloy elements of (nickel-chromium-nitrogen) synergistic stable austenite, matching with a manufacturing process of sealed baking and roller die drawing forming of powder at the temperature of 120-140 DEG C and a welding process protected by argon (Ar) with the purity of 99.999%. The AKV2 of a welded joint is larger than or equal to 34J at the temperature of-269 DEG C, the tensile strength is larger than or equal to 620 MPa, the relative permeability is smaller than or equal to 1.02, the problems that nitrogen of an existing solid welding wire is difficult to control, and hardening is easy can be solved, and the welding wire is completely matched with the extreme working condition of a controllable nuclear fusion device.

The invention belongs to the technical field of collaborative and comprehensive utilization of metallurgical solid waste resources, and particularly relates to a method for preparing a high-nickel ferrochrome alloy from electric furnace refining dust and blast furnace dedusting ash. The method comprises the following steps: uniformly mixing electric furnace refining dust, blast furnace dedusting ash and coking coal, and carrying out hot press molding to obtain a mixed briquette; carrying out high-temperature carbon thermal reduction on the mixed briquette; cooling the high-temperature carbon thermal reduction product under the protection of inert gas to obtain a high-nickel ferrochrome alloy and self-pulverization slag; according to the method for preparing the high-nickel ferrochrome alloy, a flux and a binder are not used. According to the method, the electric furnace refining dust and the blast furnace dedusting ash are combined, and a large amount of C contained in the blast furnace dedusting ash is used for efficiently reducing metal elements such as Fe, Cr and Ni in the electric furnace refining dust, so that the effect of turning waste into wealth is achieved, flux, binder and the like do not need to be added in the process, and the cost is low. And the energy consumption can be reduced while the collaborative utilization of solid waste resources is realized.

This invention discloses a method for dissolving NiCrPSi nickel alloy samples for ICP-OES detection, comprising the following steps: mixing the NiCrPSi nickel alloy sample to be tested with hydrochloric acid aqueous solution, concentrated nitric acid, and hydrofluoric acid aqueous solution, digesting at 120-140℃ for 1.5-2.5h, and then evaporating the solution to dryness at 220-260℃; then adding nitric acid aqueous solution and heating until the solid is completely dissolved, and then diluting with water to obtain the NiCrPSi nickel alloy test solution. The dissolution method of this invention can completely dissolve NiCrPSi nickel alloy powder without elemental loss, providing an accurate sample solution for ICP-OES detection; and it eliminates the need for specialized equipment such as microwave digesters or electrothermal digesters, as well as special reagents such as perchloric acid and tartaric acid, using only conventional acid reagents and general experimental equipment, thus reducing costs, simplifying operation, and enhancing versatility.

The utility model belongs to the technical field of electric heating alloy wires, and discloses a nickel-chromium high-resistance electric heating alloy wire which comprises an alloy wire body, an inner core layer is arranged in the middle of the interior of the alloy wire body, a middle core layer is arranged on the outer wall of the inner core layer, and an outer core layer is arranged outside the middle core layer. The protective assembly is arranged outside the outer core layer, the protective assembly comprises a first shell and a second shell, the protective assembly is arranged, the elastic belt is pulled to be separated from the annular groove under the elastic action of the elastic belt, then the elastic belt is dragged out of the first shell and the second shell, and the protective assembly is arranged outside the first shell and the second shell. And limiting between the first shell and the second shell is relieved, so that the first shell and the second shell on the surface of the alloy wire body are rapidly replaced, the abraded shells of the alloy wire body are rapidly replaced, and normal use of the nickel-chromium high-resistance electric heating alloy wire is facilitated.

The invention relates to a preparation method of a nickel-chromium-iron alloy consumable electrode, the consumable electrode and an alloy ingot. The method comprises the steps that an electrolytic nickel plate is subjected to vacuum melting under the condition that the vacuum degree is smaller than or equal to 0.67 Pa, after the electrolytic nickel plate is melted down, the vacuum degree is kept to be smaller than 2 Pa and lasts for 5 min to 10 min, and a nickel melt with the lead removal rate larger than or equal to 60% is obtained; pouring the nickel melt into a pure nickel electrode under a vacuum condition; combining the pure nickel electrode with industrial pure iron to form an iron-nickel composite electrode; with the iron-nickel composite electrode as a consumable electrode, ferrochrome is added into a lined electroslag furnace for smelting, and a high-temperature metal melt is obtained; the high-temperature metal melt is tapped to a steel ladle, and argon is blown to the bottom of the high-temperature metal melt in the steel ladle for 3-5 min; and the high-temperature metal melt obtained after bottom argon blowing is poured into the consumable electrode. According to the method, five types of fusible elements including Pb, Bi, Sn, As and Sb are systematically and gradually reduced to be extremely trace by coupling three steps of vacuum volatilization, deep electroslag separation and secondary ladle refining.

The invention relates to the technical field of nano-coatings, and discloses a high-temperature self-lubricating wear-resistant nanocrystalline coating with a bionic structure and a preparation method thereof.The preparation method comprises the steps that nickel-chromium alloy and pure aluminum serve as target materials, a plurality of basic unit layers are sequentially and repeatedly deposited on the surface of a base material from bottom to top through the magnetron sputtering technology, and the high-temperature self-lubricating wear-resistant nanocrystalline coating with the bionic structure is obtained; the plurality of basic unit layers form a coating, each basic unit layer comprises a first layer and a second layer, the first layer of the lowest basic unit layer is combined with the base material, the second layer of the uppermost basic unit layer forms a surface layer, the first layer of each basic unit layer comprises Ni and Cr elements, the second layer of each basic unit layer comprises Ni, Cr, Al and optionally O elements, and the surface layer of each basic unit layer comprises Ni, Cr, Al and optionally O elements. And the O element content of the second layer of the plurality of basic unit layers is gradually increased along with the increase of the number of deposited layers. The components and the structure of the coating are constructed in a gradient manner through oxygen element doping and aluminum element deposition time regulation and control, so that the coating has excellent tribological performance at the temperature of 600-800 DEG C, and the long-term anti-attrition and wear-resistant protection effect can be achieved.

The invention relates to the technical field of metal regeneration and cyclic utilization, in particular to a method for preparing Cr-W-C alloy from K213 high-temperature alloy injection residues, and aims to solve the problem that the overall utilization rate of nickel, chromium and tungsten metal in the existing K213 high-temperature alloy injection residues is low. The method comprises the following steps: briquetting alloy slag in a target raw material K213, carrying out smelting and water quenching through an electric arc furnace, carbonylating alloy particles to obtain carbonyl nickel and carbonyl iron, carrying out subsequent decomposition, carrying out hydraulic classification on the obtained carbonylation slag, mixing heavy components with graphite powder, briquetting, and carrying out reduction roasting to obtain the Cr-W-C alloy. Through Cr-W-C alloy preparation, difficult-to-treat materials K213 piled up for a long time in the cast high-temperature alloy industry are regenerated into Cr and W raw materials for vacuum melting of the high-temperature alloy K213, the alloy is high in purity and low in oxygen and nitrogen content, segregation and scum control in the vacuum induction melting process of the high-temperature alloy K213 is facilitated, the quality of a K213 mother alloy product is greatly improved, and meanwhile, the product quality of the high-temperature alloy K213 is greatly improved. Nickel and iron in the K213 alloy slag are effectively recovered and are used for preparing the carbonyl ferronickel powder.

This invention discloses a process for producing 65Mn steel through continuous casting and rolling of thin slabs, belonging to the field of steel production. The method includes the following steps: steelmaking, casting and rolling, and slow cooling. The steel composition is controlled as follows: C: 0.62%-0.70%, Si: 0.17%-0.37%, Mn: 0.90%-1.20%, P≤0.035%, S≤0.030%, Cr≤0.20%, Ni≤0.30%, Cu≤0.25%, with the balance being Fe and impurities. In the continuous casting process, the slab thickness is 90mm-110mm, the casting speed is controlled at 4.0m / min-4.8m / min, and the temperature difference of the slab cross-section is controlled at 40℃-65℃. In the finishing rolling process, the F3 work roll uses high-speed steel rolls, and the F4 and F5 work rolls use high-nickel-chromium rolls. The crown of the F3 work roll is set to be 200µm larger than that of other steel grades, and the load distribution of each stand follows a decreasing principle. Compared with existing technologies, this method improves the yield rate of straight hair curls.

To provide a laminated resistor that is low in height and suppresses a short circuit caused by solder wetting.SOLUTION: A multilayer resistor includes a thin plate-shaped resistor having a first plane and a second plane in the thickness direction, a first electrode formed on the first plane, and a second electrode formed on the second plane, the resistor contains a nickel-chromium or iron-chromium metal material, the second electrode faces a circuit pattern when mounted on a circuit board, and the thickness of the resistor is configured to be between three and eight times the thickness of the second electrode.SELECTED DRAWING: Figure 1

The application relates to the field of high-precision resistor devices, in particular to a film-coated resistor and a processing method thereof. The film-coated resistor comprises a ceramic substrate, the left and right ends of the ceramic substrate are integrally formed with cylindrical parts, a nickel-chromium alloy film is deposited on the ceramic substrate, a sleeve is sleeved on each cylindrical part, and a metal sheet is arranged on each sleeve. The processing method comprises the following steps: S1, ultrasonic cleaning of the ceramic substrate with deionized water to remove oil stains, dust and impurities on the surface, and then drying for standby; S2, placing the nickel-chromium alloy into a storage pot, and fixing the ceramic substrate on four clamping rods in an evaporation box; S3, covering a cover plate on the evaporation box, and performing air extraction on the inside of the evaporation box to form a low-pressure state; and S4, driving a resistance heating ring to heat the nickel-chromium alloy in the storage pot, so that the nickel-chromium alloy evaporates and diffuses in a gaseous form.

The invention provides a buried resistor metal foil and application thereof.The buried resistor metal foil comprises a conductive layer and a resistance layer arranged on the surface of at least one side of the conductive layer, the resistance layer comprises nickel and chromium elements, and the nickel and the chromium elements are arranged in the thickness direction of the buried resistor metal foil from the face close to one side of the conductive layer. The mass content of nickel in the resistive layer is reduced and then increased, and the mass content of chromium is increased and then reduced. According to the buried resistor metal foil provided by the invention, the chromium content in the resistive layer is not a constant value but changes along with the thickness, and the change of the chromium content in the resistive layer is controlled, so that the material has good etchable processability and excellent corrosion resistance in a medium-high temperature severe environment, and can better adapt to high-end equipment; the performance requirement of an electronic system on the buried resistance metal foil in a severe environment is met, and the application limitation of a conventional material in a special scene is broken through.

The invention belongs to the field of metal material processing, and particularly relates to a high-resistance electrothermal alloy and a preparation method thereof, the alloy comprises the following powder raw materials by weight: 17.0-22.0% of Cr, 0.3-0.5% of Ti, 0.1-0.2% of Zr, 0.2-0.3% of Nb, 0.1-0.3% of Si, 0.05-0.15% of Al, 0.2-0.5% of Mn, 0.005-0.02% of C, and the balance Ni and inevitable impurities; the total content of impurities is less than or equal to 0.1%, S is less than or equal to 0.01%, and P is less than or equal to 0.01%; the raw materials are subjected to the processes of pretreatment, vacuum melting, electroslag remelting, hot working, graded aging treatment, finished product machining and the like to prepare the nickel-chromium electrothermal alloy, and the problems that in the prior art, in the long-term use process of nickel-chromium electrothermal alloy at a high temperature, creep deformation is prone to being too large, and the size stability and the service life of a heating element are affected can be effectively solved.

The invention discloses an oil-stain-resistant and wear-resistant efficient protective rare earth coating and a preparation method thereof. The coating is composed of 50-70 parts of tungsten carbide powder, 10-20 parts of cobalt-coated tungsten carbide composite powder, 8-15 parts of yttrium-stabilized zirconia powder, 5-12 parts of rare earth oxide composite powder and 5-10 parts of nickel-chromium-aluminum-yttrium alloy bonding powder, wherein rare earth oxide is a mixture of cerium oxide and lanthanum oxide. The preparation method of the coating comprises the steps of base body sand blasting coarsening and cleaning, three-dimensional mixing of all component powder and high velocity oxy-fuel spraying deposition. Decarburization of tungsten carbide is inhibited through a cobalt coating structure, composite rare earth is utilized to refine grains and reduce surface energy, and an optimized spraying process is combined, so that the coating has high hardness, high bonding strength, low porosity, low wear rate and excellent oleophobicity, the problems that a traditional wear-resistant coating is easy to adhere, difficult to clean and short in service life in a greasy dirt environment are effectively solved, and the service life of the coating is prolonged. The coating is suitable for surface protection of key parts such as hydraulic machinery and aero-engines.

The invention belongs to the technical field of metallurgical materials, and relates to a preparation method of a Ti3SiC2 / BN / B4C reinforced copper-based brake pad material. According to the high-iron copper-based brake material prepared by taking nickel-chromium alloy, Sn and Si powder as raw materials, taking hBN and Ti3SiC2 as lubricants, taking cBN and B4C as hard phases and supplementing a small amount of nickel-chromium alloy, Sn and Si powder, the high-iron copper-based brake material has excellent tribological performance, mechanical reliability and service stability. In the aspect of a lubricating system, hBN is used as a high-temperature lubricant, so that the friction coefficient and abrasion are effectively reduced; ti3SiC2 serves as ternary layered ceramic and has the electric conduction and heat conduction performance of metal and the high temperature resistance performance of ceramic, a small amount of nickel-chromium alloy, Sn and Si powder are supplemented, and the problem that brake vibration and howling are likely to be generated due to excessive SiC and TiC hard phases of a carbon-ceramic brake interface is solved. The brake pad has the characteristics of high-temperature friction stability, low wear rate and environmental friendliness, and provides a high-reliability solution for a high-speed rail braking system.

This invention relates to the field of circuit material processing technology, and in particular to a high-performance buried resistive copper foil and its preparation method. The buried resistive copper foil is composed of an electrolytic copper foil layer, a barrier layer, a resistance alloy layer, and a cobalt-based alloy seed layer. The cobalt-based alloy seed layer is a cobalt-tantalum-iridium-molybdenum alloy. The resistance alloy layer is an alloy composed of two or more elements selected from nickel, chromium, aluminum, silicon, phosphorus, cobalt, tin, tantalum, iridium, and molybdenum. The barrier layer is an alloy composed of one or two elements selected from nickel, chromium, aluminum, silicon, phosphorus, cobalt, tin, tantalum, iridium, and molybdenum. The preparation method includes the following steps: carrier cleaning, double-sided seed layer preparation, double-sided resistance alloy layer preparation, double-sided barrier layer preparation, hot pressing treatment, and carrier peeling. This invention improves the overall performance of the product through a multi-layer alloy plating structure design; at the same time, it provides an efficient preparation method to achieve simultaneous double-sided preparation and one-time production of two sheets of buried resistive copper foil, significantly improving production efficiency and reducing production costs.

The invention relates to a process system and method for reducing the smelting cost of 300-series low-phosphorus stainless steel, and belongs to the technical field of stainless steel smelting. According to the scheme, the high-phosphorus medium-nickel pig iron is molten through the electric furnace, and the molten liquid is subjected to desilicication, decarburization and dephosphorization treatment; melting alloys such as waste steel, ferronickel and ferrochromium through an intermediate frequency furnace; a pre-melting tank is connected with pre-melting liquid of an intermediate frequency furnace and then connected with dephosphorized molten nickel iron of an electric furnace, and the mixed pre-melting liquid is added into an AOD (Argon Oxygen Decarburization) furnace; and performing stainless steel refining treatment in an AOD furnace, performing desilicication, decarburization, reduction and desulfurization treatment on the pre-molten liquid, and tapping after steel grade components reach the end point. By combining the electric furnace and the intermediate frequency furnace, the smelting cost of the 300-series low-phosphorus stainless steel is reduced. According to the scheme, the high-phosphorus raw material is used to the maximum extent, and the premelting liquid melted by the intermediate frequency furnace is also used as much as possible, so that the target of improving the metal yield in the smelting link is achieved, the use amount of nickel and chromium alloy in the subsequent AOD furnace link is further saved, and the production cost is reduced.

The invention relates to the technical field of electronic materials, in particular to a non-adhesive flexible copper-clad plate and a preparation method thereof.Nickel-phosphorus is sputtered on base material polyimide, the phosphorus element destroys the crystal structure of the nickel element, a nickel-phosphorus seed layer of an amorphous structure is formed, a copper layer is sputtered on the nickel-phosphorus seed layer, and the non-adhesive flexible copper-clad plate is obtained. And carrying out epitaxial growth of the copper element on the surface of the nickel-phosphorus seed layer in a two-dimensional layered manner to form a copper film, electroplating the surface of the copper film in an alkaline electroplating bath to thicken a copper layer, and carrying out oxidation treatment to obtain the non-adhesive flexible copper-clad plate. The seed layer selects a nickel-phosphorus target material to replace traditional nickel-chromium, so that environmental pollution is remarkably reduced. The technology is high in integration level, intermediate pollution is avoided, the peel strength of the obtained product can reach 0.8 N / mm or above, and the method is suitable for ultrathin high-frequency electronic devices.

The invention discloses a method for producing nickel-chromium-iron alloy, and belongs to the technical field of metal smelting. In the smelting process of the nickel-chromium-iron alloy, a smelting catalyst composed of tantalum powder and yttrium nitride is used, so that the quality of a smelted product is not affected, the power consumption is reduced, and the problem that in the traditional process, due to the fact that the melting points of nickel, chromium and iron serving as main components in the nickel-chromium-iron alloy are high, the smelting temperature is low is solved. The invention solves the problems of large energy consumption in the smelting process due to the improvement of the technology, realizes the energy conservation and consumption reduction, is beneficial to the green production and transformation and upgrading of enterprises, and has important economic value and social benefit.

The invention discloses low-cost 2Cr13 martensitic stainless steel which comprises the following chemical components in percentage by mass: 0.18-0.20% of C, 0.30-0.45% of Si, less than or equal to 0.30% of Mn, less than or equal to 0.035% of P, less than or equal to 0.030% of S, 12.50-12.70% of Cr, less than or equal to 0.60% of Ni, less than or equal to 0.020% of N and the balance of Fe and inevitable impurity elements. The nickel-chromium equivalence ratio Ni ' / Cr' is controlled to be smaller than or equal to 0.5, the chromium equivalent Cr 'is equal to% Cr + 1.5% Si, and the nickel equivalent Ni' is equal to% Ni + 30 (% C +% N) + 0.5% Mn. The method has the advantages that the production cost is reduced on the premise of ensuring the material performance, the quality defects of the casting blank are reduced, the yield of the hot-charging cogging process is improved, and high quality and low cost are both considered.