307 results about "Nichrome" patented technology

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 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 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.

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 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.

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.

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 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.

The utility model discloses equipment for electrolyzing and removing a copper-nickel-chromium coating, and particularly relates to the technical field of electrolysis equipment, which comprises a base, a top plate is arranged above the base, a plurality of anode lifting appliances distributed in an annular array are fixedly arranged at the bottom of the top plate, electrolytic tanks and cleaning tanks are fixedly arranged at the top of the base, and the number of the electrolytic tanks and the number of the cleaning tanks are the same as that of the anode lifting appliances. Two cathode plates are fixedly arranged in each electrolytic tank, a round hole is formed in the center of the top of the top plate, a cylinder penetrates through the interior of the round hole, and the multiple electrolytic tanks and the multiple cleaning tanks are distributed around the cylinder at intervals. According to the utility model, the copper-nickel-chromium coating on the surface of the metal workpiece is subjected to electrolytic stripping treatment through the plurality of electrolytic tanks, and the copper-nickel-chromium coating on the surface of the metal workpiece is treated by adopting a plurality of electrolyte stripping modes, so that the electrolytic stripping effect can be improved, and the metal workpiece can be cleaned by the cleaning tank between the two adjacent electrolytic tanks; and mutual influence among various electrolytes is avoided, so that the electrolytic stripping effect can be further improved.

The invention belongs to the technical field of metal explosive welding, and particularly relates to a corrosion-resistant hastelloy-steel composite plate and a preparation method thereof.The corrosion-resistant hastelloy-steel composite plate structurally comprises a carbon steel base layer, a nickel-based composite transition layer and a hastelloy layer which are sequentially arranged from bottom to top; the contact surface of the carbon steel base layer and the nickel-based composite transition layer is subjected to laser micro-etching treatment; the nickel-based composite transition layer is composed of a nickel-chromium alloy matrix and a corrosion inhibitor nanocapsule; the corrosion inhibitor nanocapsule is prepared by loading a compound corrosion inhibitor of sodium molybdate and benzotriazole on a mesoporous silica carrier; the corrosion-resistant hastelloy-steel composite plate structure is manufactured through an explosive welding process. The nickel-based composite transition layer containing the mesoporous silica loaded compound corrosion inhibitor nanocapsule is arranged on the carbon steel base layer subjected to laser micro-etching treatment, and then the nickel-based composite transition layer and the hastelloy layer are subjected to explosive welding, so that the binding force is improved; and stable transition and interface corrosion inhibition of the carbon steel base layer and the hastelloy layer are achieved through the nickel-based composite transition layer, and the corrosion resistance of the composite board is improved.

The application provides a heat pipe type heater for crude oil in oil well, which comprises an outer pipe body, a heating pipe, a non-magnetic 304 stainless steel butt joint cover, a magnetic impeller and a pressure linkage demulsification assembly. The outer stator and the impeller magnet constitute a non-penetrating magnetic drive without transmission shaft leakage hazards. The impeller centrifugally separates the sand and stores it in a storage area, and the crude oil flows into the heating pipe through the side hole of the intercepting wall. The heating pipe is filled with magnesium oxide insulation powder, and the nickel-chromium heating wire is embedded in the thick wall layer. The crude oil is heated through double-side heat exchange in the pipe and the clamping cavity, and the guide vane forms S-shaped turbulent flow to ensure uniform heating. The flange realizes self-tight sealing with oil pressure; the high-viscosity crude oil pulls the rotating shaft under high pressure to make the combination disc adhere, and the guide vane automatically shears at high speed to demulsify. The whole machine cancels multiple through-wall heat pipes, only two static seals, multiple seal protection realizes no leakage operation of the equipment, and the sand removal, heating and self-adaptive demulsification are completed in an integrated manner. The structure is simple, and the device is suitable for oilfield heavy oil wellhead pretreatment.

The present application relates to the technical field of electric heating strip, specifically to a production equipment for nickel-chromium electric heating strip, comprising a placing table, a clamping unit, a processing table and a straightening mechanism, the clamping unit comprises an arc-shaped plate, and the arc-shaped plate is slidably arranged on the front and back of the two vertical sections of the placing table. The clamping process of the two arc-shaped plates determines the axis direction of one end of the electric heating strip, and the subsequent straightening direction is determined based on this. The multiple locking blocks achieve multi-point locking of the pitch section of the electric heating strip, and lock the pitch of the electric heating strip. In addition, the right two straightening rollers clamp and lock the starting point of the straightening section. In summary, the spiral characteristics and pitch of the spiral section are locked, avoiding the problem that the spiral section of the electric heating strip deforms during straightening, causing it to be unusable.

The utility model relates to a solid aluminum oxide filled high-voltage fused salt electric heater and belongs to the technical field of heating. The electric heater is composed of an upper copper rod lead, a lower copper rod lead, an upper aluminum oxide rod plug, a lower aluminum oxide rod plug, an aluminum oxide rod protection filling, a nickel-chromium alloy resistance wire, a fin sleeve, a U-shaped copper rod lead and a U-shaped sleeve. The upper copper rod lead is connected with the upper aluminum oxide rod plug and the nickel-chromium alloy resistance wire through screw threads. The upper aluminum oxide rod plug is connected with the fin sleeve through screw threads. The lower aluminum oxide rod plug is connected with the fin sleeve and the U-shaped sleeve through screw threads. The aluminum oxide rod protection filling serves to fix the position of the resistance wire and prevent high-voltage breakdown. The fin sleeve serves to increase heat dissipation and can adopt longitudinal fins or circular fins. The U-shaped copper rod lead and the U-shaped sleeve are filled with aluminum oxide powder to prevent high-voltage breakdown.

This invention discloses a method for co-preparing nickel-chromium oxide pellets using laterite nickel ore and stainless steel slag, and its application, relating to the fields of metallurgical solid waste resource utilization and mineral processing technology. The method includes: raw material pretreatment: drying, crushing, and grinding laterite nickel ore and stainless steel slag to obtain laterite nickel ore powder and stainless steel slag powder with a particle size of -0.074 mm or more (more than 60%) and a D50 of 0.06 mm to 0.07 mm; pelletizing: mixing laterite nickel ore powder and stainless steel slag powder at a mass ratio of (75~85):20, and then forming pellets to obtain green pellets; oxidative roasting: the green pellets undergo preheating, roasting, and homogenization treatment to obtain nickel-chromium oxide pellets; wherein the roasting temperature is 1265℃~1285℃. The application is to use the nickel-chromium oxide pellets as a charge in a hydrogen-based vertical shaft furnace-electric furnace for stainless steel smelting. This invention solves the problems of stainless steel slag storage and comprehensive utilization of laterite nickel ore. By utilizing the complementary properties of the two materials, high-strength, high-metallurgical-performance nickel-chromium oxide pellets are obtained.

The invention discloses a ceramic-based nano-film pressure core body and a manufacturing method thereof, and belongs to the technical field of ceramic piezoresistive sensor core bodies, and the ceramic-based nano-film pressure core body sequentially comprises a ceramic substrate, an interface transition layer, a composite nano-film layer, a gold layer and a doped silicon dioxide protection layer from bottom to top, the composite nano film layer sequentially comprises a nickel-chromium alloy layer and a nickel-copper alloy layer from bottom to top; the interface transition layer is a titanium-aluminum alloy layer deposited on the surface of the ceramic substrate through magnetron sputtering; and the doped silicon dioxide protective layer contains 1 to 3 weight percent of BN, 0.5 to 2.0 weight percent of Ga2O3 and the balance of SiO2. According to the invention, the compatibility between the ceramic and the metal alloy nano-film layer is improved through the interface transition layer, and the insulating property of the core body is improved through the doped silicon dioxide protection layer. The problems that a traditional core body is low in precision, large in temperature drift and poor in insulation are solved, and a high-voltage power system and other harsh scenes are adapted.

The invention discloses a metal-based nickel-chromium strain film as well as a preparation method and application thereof, and relates to the technical field of sensor strain films, the metal-based nickel-chromium strain film is prepared by adopting an ion beam sputtering method, and the specific method comprises the following steps: firstly, carrying out pre-sputtering, then carrying out formal sputtering, and depositing a nickel-chromium alloy strain film on an insulating layer film; and during pre-sputtering and formal sputtering, the voltage ranges from 500 V to 800 V, the acceleration voltage ranges from 180 V to 220 V, the current ranges from 160 mA to 200 mA, and the pre-sputtering time ranges from 90 min to 120 min. The strain film prepared by the preparation method of the nickel-chromium alloy strain film has the advantages of good resistivity batch consistency and strong interface bonding force, and the prepared nickel-chromium alloy film can be ensured to be small in roughness and good in film quality while the bonding force is ensured, so that the nickel-chromium alloy strain film has relatively good long-term stability.

The invention provides a welding rod for nickel-chromium-cobalt-molybdenum high-temperature alloy welding and a preparation method of the welding rod, and relates to the technical field of welding materials. The welding rod for nickel-chromium-cobalt-molybdenum high-temperature alloy welding comprises a core wire and a coating, and the coating comprises, by mass, 22%-30% of rutile, 29%-38% of marble, 3.5%-5.0% of fluorite, 18%-24% of cryolite, 3.5%-5.0% of potassium titanate, 0.8%-1.5% of cobalt powder, 0.8%-1.5% of molybdenum powder, 1.5%-3.0% of ferroniobium, 0.8%-1.5% of manganese metal, 0.8%-1.5% of reduced iron powder, 0.4%-1.0% of sodium alginate, 0.8%-1.5% of sodium carbonate and 0.4%-1.0% of CMC. When the welding rod is used for carrying out submerged arc horizontal position welding on the nickel-chromium-cobalt-molybdenum high-temperature alloy, the electric arc stability is good, deslagging is good, forming is attractive, deslagging is easy, deposited metal components are stable, and the mechanical property is excellent.

The utility model relates to the technical field of nickel-chromium processing for new energy hydrogen production, in particular to a nickel-chromium alloy processing device for new energy hydrogen production, which comprises a device plate, a support frame is mounted on the device plate, a first screw rod and a second screw rod are connected onto the support frame, a movable frame is connected onto the first screw rod, and the movable frame is connected onto the second screw rod. A first rotating disc is rotationally connected to one side of the movable frame, a base is connected to the second lead screw, a grinding roller is arranged on the base, a fixing frame is further installed on the device plate, a second rotating disc is connected to one side of the fixing frame, and a cylindrical shell, a clamping disc and a transverse clamping plate are rotationally connected to the second rotating disc. According to the clamping device, the possibility that the device cannot clamp nichrome in different shapes is reduced, the operation difficulty in the positioning and clamping process is reduced, the effect that the device conveniently adjusts the position of a clamp is improved, materials in various shapes are clamped, the effect that the device adjusts the angle of the materials is also improved, and different edges of the materials are conveniently treated.

This invention relates to the field of intelligent heat treatment production line technology, and discloses a foaming molding device for a nickel-chromium composite AB-type hydrogen storage alloy porous material, comprising: a molding mold defining a molding cavity for containing powder material; an atmosphere control component connected to the molding cavity to alternately construct a vacuum or inert gas environment; and a hot-pressing temperature control component disposed on the molding mold for applying a densification temperature and pressure load to the powder material in the vacuum environment, and providing a foaming thermal field and cooling heat exchange conditions corresponding to the solid-liquid two-phase region of the alloy in the inert gas environment. The purpose of this invention is to solve the problems in traditional foaming processes where the precursor needs to be removed from the densification mold and transferred to the foaming furnace for secondary heating, resulting in oxidation of the high-temperature precursor during the transfer process, temperature fluctuations affecting the uniformity of the pore structure, reduced production efficiency due to two clamping and positioning operations, and low yield due to process discontinuity.

The invention discloses an NO2 sensor based on an MOF-derived Ni-doped In2O3 core-shell octahedral sensitive material and a preparation method of the NO2 sensor, and belongs to the technical field of semiconductor metal oxide gas sensors. The sensor is composed of a ceramic tube substrate with parallel annular gold electrodes on the surface, an MOF-derived Ni-doped In2O3 core-shell octahedral sensitive material film coated on the surfaces of the electrodes and the substrate, and a nichrome heating coil arranged in the ceramic tube. A core-shell octahedral structure In2O3 nano material with a high specific surface area and abundant pores is constructed by using an MOF template method, and a Ni-doped modulated electronic structure and enhanced surface activity are combined, so that the sensitivity of the sensor to NO2 gas is remarkably improved, the detection lower limit is reduced, the humidity interference is effectively inhibited, and the detection sensitivity of the sensor to NO2 gas is improved. The invention provides a reliable solution for monitoring trace NO2 in a complex environment, and has important practical value and application prospect.