199 results about "Nichrome" patented technology

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 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 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 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 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.

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 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.

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.

The utility model discloses a kind of multi-gear adjustable hemispherical cover type electronic temperature test instrument, including hand pole, the upper end of the hand pole is fixedly connected shell, shell is equipped with hemispherical heating cover, the inner wall of the hemispherical heating cover is fixedly connected with two ceramic skeletons symmetrically, the outer wall of two ceramic skeletons is spirally wound with heating wire, the heating wire is nickel-chromium alloy wire, the inner bottom of the hemispherical heating cover is equipped with thermocouple, the outer wall of the hand pole is fixedly connected with control assembly. The utility model can realize accurate temperature control, multi-gear adjustment and have safety protection function, to meet the actual demand of fire detection work.

The invention relates to the technical field of metal materials, in particular to a high-toughness alloy for a high-speed rail and a preparation method of the high-toughness alloy. The alloy comprises 0.06%-0.12% of carbon, 0.05%-0.12% of cerium, 0.012%-0.032% of yttrium, 1.0%-1.5% of tantalum, 10.0%-15.0% of nickel, 12.0%-14.0% of chromium, 3.5%-5.0% of cobalt, 1.5%-2.5% of molybdenum, less than or equal to 0.005% of sulfur and the balance of iron. A preparation method of the modified carburant used in the preparation comprises the following steps: S1, pickling petroleum coke; s2, preparing cerium oxide sol; s3, preparing a cerium oxide coating layer; and 4, depositing a layer. The strength of the alloy is remarkably improved, meanwhile, the alloy has excellent toughness, wear resistance and hardness, and the service life of high-speed rail parts is prolonged. The preparation method is convenient to operate and is suitable for industrial production.

This invention relates to the field of heat-resistant alloys and high-temperature alloys, and discloses a high-temperature resistant creep-resistant iron-nickel-chromium-based alloy and its preparation process. The alloy, by weight percentage, comprises Ni 25.0%–28.0%, Cr 18.0%–22.0%, C 0.06%–0.08%, V 0.50%–0.80%, N 0.10%–0.15%, Ce 0.015%–0.025%, B 0.005%–0.010%, Mn 0.3%–0.8%, and Si 0.1%–0.4%, with the balance being Fe and unavoidable trace impurities. The preparation process employs gradient-controlled pressure reverse nitrogen purging, delayed addition of a nickel-cerium master alloy and a micro-carbon boron-iron alloy before tapping, combined with a double-step isothermal carbon consumption treatment. This approach improves the effective utilization rate of nitrogen and rare earth elements, and enhances the high-temperature creep life, fracture elongation, and cross-sectional property consistency of large-section forgings.

The invention belongs to the technical field of special alloy materials, and particularly relates to a nickel-chromium alloy for a nuclear reactor and a preparation method of the nickel-chromium alloy. The nickel-chromium alloy comprises the following chemical components: 30%-40% of Cr, 1.2%-2.0% of Mo, 0.05%-0.25% of N, less than or equal to 0.03% of C, 0.05%-0.5% of optional first other elements, less than or equal to 0.15% of optional second other elements and the balance of Ni and inevitable impurities. The first other element and the second other element are respectively Ti or Al or Nb or Zr, and the first other element and the second other element are different. The nickel-chromium alloy provided by the invention is excellent in mechanical property and corrosion resistance, and can be used as a nuclear reactor fuel cladding material, a control rod cladding material and other key reactor core structure materials.

The utility model discloses a nickel chromium-nickel silicon armored thermocouple wire processing device, which relates to the technical field of armored thermocouple wire processing, and comprises a base, the upper surface of the base is fixedly provided with a fixing frame, the surface of the fixing frame is rotatably connected with a cable winding disc, the front surface of the fixing frame is fixedly connected with two extension plates, and the extension plates are fixedly connected with the cable winding disc. And a horizontal lead screw is rotationally connected between the two extension plates, the surface of the horizontal lead screw is in threaded connection with a moving platform, and a dirt removing mechanism is arranged on the upper surface of the moving platform. According to the utility model, through the arrangement of the decontamination mechanism, when an armored thermocouple wire is wound, an armored cable can pass through the space between the two guide cleaning rollers in the limiting frame, so that the surface of the cable can be cleaned and decontaminated by sponge sleeves on the surfaces of the guide cleaning rollers in the cable winding process; and meanwhile, the guide cleaning roller can be used for guiding and limiting the cable, so that the cable is smoother in the winding process, and the cable winding efficiency is improved.

The invention provides a nickel-chromium-iron alloy material and a preparation process thereof, and relates to the technical field of preparation devices.The nickel-chromium-iron alloy material is characterized in that a smelting assembly is located above a tank body and used for smelting alloy raw materials, and a preheating assembly is installed on a water tank and used for conducting heat in tail gas generated by the smelting assembly into a conveying assembly; and the preheating assembly is arranged in the tank body and used for preheating the alloy raw materials in the conveying assembly, the conveying assembly conveys the alloy raw materials into the smelting assembly to be smelted, and a stirring assembly is arranged in the tank body and used for stirring the smelted alloy raw materials. The preheating assembly is arranged, heat carried by tail gas in the smelting process is used for heating circulating water, then the heat is transferred to raw materials in the conveying pipeline through the preheating pipe, recycling of waste heat of the tail gas is achieved, energy consumption is effectively reduced, after the preheated raw materials enter the smelting assembly, the smelting time can be shortened, and the smelting efficiency is improved. And the smelting efficiency is improved, so that the overall production energy consumption and cost are reduced.

The application relates to the field of thin-film resistors, and discloses a flexible precision thin-film resistor and a manufacturing method thereof. The manufacturing method of the flexible precision thin-film resistor comprises the following steps: performing oxidation treatment on a silicon substrate to form an insulating layer on the surface of the silicon substrate; forming a resistor layer and an electrode layer on the insulating layer; performing pattern treatment on the resistor layer to form a resistor pattern; performing laser resistance adjustment on the resistor pattern to adjust the resistance value of the resistor pattern; forming a flexible protective layer on the resistor pattern after the resistance adjustment; and performing thinning treatment on the silicon substrate. The silicon substrate is used as a resistor substrate, the substrate is thinned to 15 microns after the resistor layer and the protective layer are formed, the product has excellent flexibility, and is suitable for flexible circuits; the nickel-chromium alloy is selected as the resistor layer, vacuum sputtering and heat treatment are combined, the temperature coefficient is less than or equal to 10 ppm / DEG C in the range of -40 DEG C to 70 DEG C; the polyimide flexible protective layer is adopted, protection is achieved, and the bending performance is not affected; the resistance value precision is less than or equal to 0.02% through laser resistance adjustment, and the high-precision requirement is met.

The invention discloses a preparation method for growing large-size isotope hexagonal boron nitride at normal pressure and high temperature and application of the large-size isotope hexagonal boron nitride in neutron detection, and the method comprises the following steps: uniformly mixing nickel powder, chromium powder and boron powder to obtain a mixture of boron and nickel-chromium alloy; then carrying out deoxidation treatment under the protection gas flow; reducing the pressure of the system, introducing mixed gas of protective gas and reactive protective gas to normal pressure, and protecting; finally, the deoxidized mixture is subjected to secondary stepped heating, heat preservation is carried out after primary heating, and the temperature of primary heating is higher than that of secondary heating; and naturally cooling to room temperature to generate the hexagonal boron nitride crystal. According to the method, the nickel-chromium alloy is adopted as the metal fluxing agent, the large-size and high-quality isotope hexagonal boron nitride single crystal is successfully prepared under the normal pressure condition through the optimized gas atmosphere and stepped temperature control, and the method has important application value in the fields of neutron detection, two-dimensional materials and the like.

The utility model discloses a high -power electric heater for thick oil development, including stainless steel outer sleeve pipe, three heating cables and thermocouple sleeve pipe are sheathed in the stainless steel outer sleeve pipe, and thermocouple assembly is sheathed in the thermocouple sleeve pipe, and the end of stainless steel outer sleeve pipe is welded with sieve tube, and the end of sieve tube is connected with the pipe through the connecting ring away from stainless steel outer sleeve pipe, and the end of pipe is connected with the plug away from the connecting ring, and thermocouple sleeve pipe and three heating cables all pass sieve tube, connecting ring and pipe in proper order. The utility model heating part adopts stainless steel mineral insulation heating cable, and the heating is even, and the heating core wire adopts nickel chromium alloy, and the heat output is big, and the service life is long, and three stainless steel mineral insulation heating cable tail stars, and the electrical connection is convenient, and the electrical control system is simplified, and contains three thermocouples, can monitor the temperature change of three positions, adjusts voltage in time, guarantees that the heating temperature satisfies the requirement, and the heater tail has sieve tube, and the steam is convenient to flow out.

The application discloses a kind of metamaterial honeycomb and its preparation method and application, it is related to aramid paper honeycomb technical field.The preparation method of the metamaterial honeycomb includes: surface roughness modification is carried out to aramid paper, chromium alloy is coated, the coating thickness is gradient distribution, core strip glue is coated, laminated, press together, stretch forming, solidification, impregnation, pre-curing, curing, after reaching target density, the metamaterial honeycomb can be obtained;The chromium alloy is silicon chromium alloy or nickel chromium alloy.The method can be prepared in the wide frequency range with excellent wave-absorbing performance material, and the adhesion of wave-absorbing material and aramid paper is strong, and the application range is wider.

The invention provides gray low-radiation refrigerator door glass. The gray low-radiation refrigerator door glass comprises a first dielectric layer, a first metal layer, a second dielectric layer, a second metal layer, a third dielectric layer, a third metal layer and a fourth dielectric layer which are sequentially compounded outwards from a glass substrate, the first metal layer comprises a nickel-chromium alloy layer; the second metal layer comprises a nickel-chromium alloy layer or a superposition layer; the third metal layer comprises a superposition layer; the superposed layer comprises a silver layer and a nickel-chromium alloy layer which are arranged in sequence; and the silver layer in the laminated layer is arranged on one side close to the glass substrate. By optimizing the structural design of the film layer, the reflectivity of the film surface is reduced, the transmission color is improved, the overall performance of the product is improved, the requirements of high-end consumer groups for the display effect and high-grade texture of the wine cabinet are met, and the wine cabinet is suitable for large-scale production and application.

According to the iron-nickel-chromium-based high-temperature alloy life prediction method and system provided by the invention, a dynamic saturated steam experimental environment for accurately controlling the dissolved oxygen concentration, the flow velocity, the temperature and the pressure is constructed, a resin cold inlaying layering metallographic measurement technology is forcibly adopted, and an oxidation film thickness and wall thickness reduction equivalent model is combined, so that the service life of the iron-nickel-chromium-based high-temperature alloy is predicted. By means of the method, oxidation behavior accurate simulation and thickness measurement error control of the iron-nickel-chromium-based high-temperature alloy under the ultra-supercritical working condition are achieved, the service life prediction period is shortened, the wall thickness reduction error is predicted, and the defect that a traditional weight increasing method is poor in adaptability to complex oxidation films is overcome; and the technical blank that the prior art cannot support the long-life prediction at the temperature of 650 DEG C or above / 300,000 hours is filled up, and a direct quantitative basis is provided for the safe operation and maintenance of the high-temperature pipeline of a new-generation ultra-supercritical power station.