517 results about "Nichrome" patented technology

The invention relates to a material that can be produced by means of the following method: • triglycerides are stirred with 0.1 to 0.5% sulfuric acid (of 99% concentration), the reaction process being able to be accelerated by cavitation, • 1 to 3% water is added and the mixture is left standing until the water settles, • this settled aqueous solution is heated in the presence of a material composed of an iron-containing alloy, for example an alloy comprising iron, nickel, chromium and manganese, in particular approximately 70% iron, 18% chromium, 8% nickel and 1.5% manganese, • the mixture, which boils at 80°C, is heated to just under 100°C, until the water has evaporated, and is held at this temperature further until the then viscous mass releases water of crystallization; thereupon, the supply of heat is stopped.

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 provides a bipolar current collector and a preparation method thereof, a battery and application, the bipolar current collector comprises a negative electrode conductive layer and a positive electrode conductive layer which are laminated, and at least one transition layer is laminated between the negative electrode conductive layer and the positive electrode conductive layer; the transition layer is made of nickel-chromium alloy, the crystallinity of the nickel-chromium alloy is 5-80%, and the transition layer is of a nonporous structure. Starting from the material and structural design of the bipolar current collector, the nonporous transition layer made of the nichrome is added, and meanwhile, the crystallinity of the nichrome is limited to be 5-80%, so that the bonding force between the negative conductive layer and the positive conductive layer can be improved, and the stability of an interface is improved; the bipolar current collector is ensured to have good structural stability, the application stability of the bipolar current collector in a battery can be promoted, and the cycle performance of the battery is improved.

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 resistor manufacturing, in particular to a manufacturing process of a high-frequency and high-precision resistor device. Comprising the following steps: S1, substrate molding: molding substrate material powder into a required substrate shape through pressing or a mold, and carrying out sintering molding; s2, depositing a conductive thin film: depositing a layer of extremely thin conductive thin film on the substrate, and manufacturing resistive layers with different thicknesses by using a nickel-chromium alloy material to adapt to various resistance values; s3, photoetching and etching: generating a pattern through photoetching or laser trimming, increasing a resistance path and calibrating a resistance value to ensure that the resistance value is within a design range; s4, adjusting a resistance value; s5, surface treatment; and S6, screening and packaging. According to the method, the precision and the performance are controlled through the steps of calibrating the resistance value in the technological process, accurately controlling the resistance pattern through laser energy and accurately controlling the size of the pattern, so that the final product can meet the requirements of high frequency and high precision.

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 nickel-silicon-boron nitride abradable sealing coating and application and a preparation method thereof, the abradable sealing coating comprises a bottom layer material in direct contact with a base material and a surface layer material located on the surface of the bottom layer material, the bottom layer material is nickel-chromium alloy, and the surface layer material is nickel-silicon-boron nitride. When the coating is prepared, automatic plasma spraying equipment is adopted, firstly, nickel-chromium alloy powder is adopted as a bottom layer material to be sprayed on the surface of a base material, and then nickel-silicon-boron nitride powder is adopted as a surface layer material to be sprayed on the surface of the bottom layer material. The prepared nickel-silicon-boron nitride abradable sealing coating can be applied to low-pressure turbine discs, high-pressure turbine guiders and sealing seats of aero-engines and gas turbines. According to the method, a traditional manual flame spraying operation mode is replaced, the safety is improved, the material utilization rate and the spraying efficiency are improved, the preparation period is shortened, the material cost is reduced, and the structure property, the bonding strength and the thermal shock resistance of the abradable seal coating are improved.

The invention provides a nickel-chromium alloy coating, a preparation method thereof and a high-temperature alloy, and the nickel-chromium alloy coating comprises the following components in percentage by mass: 33-48% of Ni, 1-5% of NH4Cl, 1-10% of FeAl, 1-10% of Al2O3, 1-10% of Si, 3-8% of Al, 0.2-0.8% of rare earth element and the balance of Cr. Through the alloying effect of nickel and chromium, a stable passivation layer is formed in the coating, corrosion of a corrosive medium to a matrix can be effectively prevented, and the corrosion resistance of the coating is improved. Through the synergistic effect of nickel and chromium, the coating can form a compact oxidation film at high temperature. The coating has better thermal conductivity and is suitable for coating the inner surface and the outer surface of the boiler. According to the invention, wettability and diffusivity between the coating and the matrix can be improved, and chemical bonding between the coating and the matrix is promoted, so that the coating is not easy to peel off or damage on the matrix, and the nickel-chromium alloy coating and the matrix have good bonding performance.

The invention discloses a preparation method for spraying a nickel-chromium-chromium carbide coating on the surface of a gas turbine part through high velocity oxy-fuel, and belongs to the technical field of preparation of the nickel-chromium-chromium carbide coating through thermal spraying. The preparation method comprises the following steps that preparation before spraying is conducted, and nickel-chromium-chromium carbide powder for thermal spraying is placed in a drying oven to be dried; cleaning is conducted, specifically, the spraying area and the adjacent area of the part are wiped and cleaned, and impurities such as oil stains are removed; protection before sand blasting is conducted, specifically, the non-sand-blasting surface and a small part of the spraying area of the part are protected through a high-temperature-resistant adhesive tape; a sand blowing machine is provided with a 0-0.6 MPa adjustable air pressure air source and is provided with an oil-water separator; spraying is conducted, specifically, a nickel-chromium-chromium carbide coating is sprayed through hypersonic flame; and cleaning is conducted, specifically, after spraying is completed, the spraying protection clamp and the adhesive tape are removed, and floating ash on the surface of the part is cleaned. The wear-resistant coating is prepared on the surface of the aero-engine and gas turbine part by adopting the process, a nickel-aluminum bottom layer does not need to be sprayed in advance, the quality is stable, and the production cost is reduced.

Wrought age-hardenable nickel-chromium-cobalt based alloy compositions suitable for use in high temperature gas turbine cases possessing higher mechanical strength, toughness / containment, and thermal stability compared to current commercial alloys and an acceptable containment factor containing in weight percent 16 to 20 wt. % chromium, 8 to 13 wt. % cobalt, 4 to 8.5 wt. % molybdenum, up to 8 wt. % tungsten, 2.1 to 4.1 wt. % aluminum, titanium up to 1.9 wt. %, up to 3.7 wt. % niobium, up to 5 wt. % iron, carbon present up to 0.15 wt. %, up to 0.015 wt. % boron, up to 7.1 wt. % tantalum, up to 0.13 wt. % silicon, up to 1.0 wt. % manganese, and up to 0.06 wt. % zirconium, with a balance of nickel and impurities. The amounts of certain alloying elements must be carefully controlled according to three compositional relationships here disclosed.

The invention discloses a high-temperature composite coating for a high-speed air bearing gas foil and a preparation method of the high-temperature composite coating. The bottom layer of the coating is a nickel-chromium alloy coating, the middle layer of the coating is a nanometer aluminum oxide reinforced titanium alloy coating, and the surface layer of the coating is a zirconium oxide or aluminum oxide coating. The high-temperature composite coating disclosed by the invention can be kept stable in an extremely high-temperature environment, and excellent heat insulation performance is provided. The nanometer aluminum oxide reinforced titanium alloy in the middle layer provides good mechanical performance and enhances the impact resistance and abrasion resistance of the coating, the nickel-chromium alloy in the bottom layer provides good adhesive force and corrosion resistance and ensures firm combination of the coating and a base material, and the surface layer further improves the high temperature resistance and heat insulation performance of the coating.

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.

The invention belongs to the technical field of functional film materials, and discloses a thermocouple which is composed of a substrate and a thermocouple unit deposited on the surface of the substrate, the thermocouple unit comprises a nickel-chromium film obtained by sputtering a nickel-chromium target material and a copper-nickel film obtained by sputtering a copper-nickel target material, wherein the nickel-chromium film and the copper-nickel film are partially overlapped so as to be connected in series, and the formed nickel-chromium-copper-nickel film layer can improve the sensitivity of the thermocouple by controlling the proportion of metal components in the nickel-chromium target material and the copper-nickel metal target material; in addition, the invention also discloses a preparation method of the thermocouple.

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 provides a nickel-based alloy bar heat treatment device and a heat treatment method thereof, and relates to the technical field of nickel-based alloy bars. The nickel-based alloy bar heat treatment device comprises an annealing furnace, a furnace door is hinged to the surface of the annealing furnace, a controller is fixedly connected to the surface of one side of the annealing furnace, and a plurality of placing plates are arranged on the inner wall of the annealing furnace in a sliding and inserting mode; the annealing furnace comprises a plurality of placement plates, stabilizing devices are arranged on the surfaces of the multiple placement plates correspondingly, each stabilizing device comprises two placement plates, the two placement plates are fixedly connected with the surface of a placement disc correspondingly, and fixing frames are fixedly connected with the surfaces of the multiple placement discs correspondingly. By means of the arrangement, a plurality of bars can be placed on the placing disc more stably and neatly, abnormal shaking and deviation are not prone to occurring, the situation that the heating effect of the surfaces of the bars is not uniform due to the fact that the bars make contact with one another is avoided, and therefore the using effect and the working efficiency of the annealing furnace are improved, and the machining effect on the nickel-chromium alloy bars is improved.

The invention relates to a water-containing alkaline composition for surface pretreatment of a metal coiled material and application of the water-containing alkaline composition. The invention provides a water-containing alkaline composition for surface pretreatment of a metal coiled material, the water-containing alkaline composition comprises 80-400ppm of ferric ions, the free alkalinity of the water-containing alkaline composition is not lower than 20 (10mL) points, and the sum of the concentrations of elements of cobalt, nickel, chromium and phosphorus in the water-containing alkaline composition does not exceed 30ppm. The water-containing alkaline composition is low in raw material cost, more environmentally friendly, wide in base material application range and high in metal coiled material surface pretreatment efficiency, a compact and uniform oxidation film can be obtained within very short treatment time, and preparation of the pre-coated metal coiled material with better paint binding force and corrosion resistance is facilitated.

The invention belongs to the technical field of mildew prevention and antibiosis, and relates to a stainless steel material for an antibiosis cutter and a preparation method and application of the stainless steel material. The stainless steel material is prepared from the following raw materials: nano silver powder, copper powder and martensite nickel-chromium stainless steel powder, the nanometer silver powder accounts for 0.01%-0.05% of the martensite nickel-chromium stainless steel powder in percentage by mass; and the copper powder accounts for 0.5-8% of the martensite nickel-chromium stainless steel powder. Martensite nickel-chromium stainless steel serves as a base material to form a dispersed copper precipitated phase and a silver-rich second phase, the stainless steel material with the excellent antibacterial performance is obtained, by optimizing the dosage of all the components, the mechanical performance such as abrasion resistance is further improved, the comprehensive performance is excellent, and the stainless steel material has wide application in antibacterial tools.

The invention discloses a titanium carbonitride-based metal ceramic material with high toughness and high compactness, titanium carbonitride is used as a hard matrix phase, tungsten carbide is used as an additive, FeCoCrNi is used as a binding phase, the mass ratio of entropy alloy in FeCoCrNi in the metal ceramic material is 12%-30%, and the mass ratio of tungsten carbide in the metal ceramic material is 20%. The invention also provides a preparation method of the titanium carbonitride-based metal ceramic material, which comprises the following steps: carrying out primary ball-milling mixing on iron, cobalt, nickel and chromium powder to obtain medium-entropy alloy binding phase powder, carrying out secondary ball-milling mixing on titanium carbonitride, the uniformly dried medium-entropy alloy binding phase powder and tungsten carbide powder, filling into a graphite mold after mixing, and carrying out compression molding to obtain the titanium carbonitride-based metal ceramic material. And carrying out spark plasma sintering on the titanium carbonitride-based metal ceramic material to prepare the titanium carbonitride-based metal ceramic material. According to the titanium carbonitride-based metal ceramic material and the preparation method thereof, the excellent mechanical property and the good molten aluminum corrosion resistance are achieved at the same time.

The invention belongs to the technical field of roller manufacturing, and particularly relates to a method for improving the wear resistance of a working layer of a high-nickel-chromium infinite chilled centrifugal composite cast iron roller. The roller working layer comprises the following chemical components in percentage by mass: 3.0 to 3.5 percent of C, 0.6 to 1.2 percent of Si, 0.6 to 1.05 percent of Mn, 2.0 to 4.5 percent of Ni, 0.7 to 2.0 percent of Cr, 0.2 to 1.0 percent of Mo, 0.1 to 1.0 percent of V, 0.2 to 1.5 percent of W, less than or equal to 0.1 percent of P, less than or equal to 0.05 percent of S and the balance of Fe. In the process of centrifugally casting and pouring the working layer molten iron, the high-hardness WC composite particles are injected into a casting mold of a centrifugal machine along with the working layer molten iron, and after the core part of the nodular cast iron roller is subjected to gravity casting, the centrifugal composite roller is subjected to heat treatment. The method can effectively solve the problem that a conventional high-nickel-chromium infinite chilled centrifugal composite cast iron roll is poor in wear resistance when being used in the rear section of finish rolling of a hot rolled strip.

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 full-opening printing plates, and particularly relates to a high-strength full-opening metal printing plate and a processing technology thereof.The high-strength full-opening metal printing plate comprises a plate body, the plate body is integrally made of alloy materials such as nickel, chromium and iron, a printing groove is formed in the end face of the plate body, and a plurality of full-opening printing grid holes are formed in the end face of the printing groove; a guide arc edge which bends and diffuses outwards is formed on the edge face, facing the printing groove, of the printing grid hole, and the area, expanded outwards by 400-550 micrometers, of the guide arc edge is gradually heightened, and a convergent horn mouth shape is formed. Through the special opening design and process, higher opening precision is achieved, the size, shape and position of the opening can meet the requirement of complex design, meanwhile, the stress concentration problem is effectively solved, the overall structural strength of the steel plate is enhanced, and the manufacturing cost is reduced. And in the printing process, it can be guaranteed that the printed grid lines have good flatness and uniformity, the situations of gourd joints and the like are effectively reduced, and the forming quality of the grid lines is improved.

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.

The invention relates to the technical field of mirror rollers, in particular to a mirror roller and a preparation process thereof.An alloy steel seamless steel pipe is selected as a base material, choline chloride-ethylene glycol ionic liquid serves as an electroplating solvent, the surface of a base part is pre-plated with a nickel-chromium-cobalt plating layer to serve as a transition layer, and then electroplating continues to be conducted on the transition layer; a nickel-chromium-cobalt surface doped with the modified nano titanium carbide is generated; carrying out low-temperature ion nitriding treatment on the electroplated substrate; the surface of the mirror roller is refined and modified through plasma electrolytic polishing, and the surface smoothness of the mirror roller is remarkably improved by controlling technological parameters of the mirror roller.

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.