744 results about "Chromium Alloys" patented technology

The invention relates to the related technical field of fabricated building outer walls, and discloses a severe cold area fabricated building outer wall based on a thermoelectric power generation technology, which comprises a fabricated wall body module, a thermoelectric power generation module, a heat collection structure module, a circuit connection module, an energy management module and a data monitoring module, the fabricated wall body module is a solid prefabricated concrete shear wall composed of an inner leaf wall plate, a heat preservation layer and an outer leaf wall plate, the heat collection structure module is fixedly installed on the outer wall of the fabricated wall body module, and the heat collection structure module comprises a heat absorption plate, a glass cover plate and a shell; according to the core component, the nickel-chromium alloy and the constantan alloy which are high in stability are directly welded for power generation, other technologies do not need to be combined, the core component can be directly applied to the building field, and under the condition that the power generation efficiency is guaranteed, the construction requirement of the building field is met as much as possible; and a brand new thought is developed for the energy-saving design of the fabricated building wall.

The invention relates to the technical field of MOS (Metal Oxide Semiconductor) semiconductors, and discloses a SiC VDMOSFET (Vertical Double-diffused Metal Oxide Semiconductor Field Effect Transistor) structure with high heat dissipation performance, which comprises a plurality of MOS cells arranged in parallel, and is characterized in that each MOS cell comprises a metal drain electrode, a semiconductor epitaxial layer, a metal source electrode and a gate oxide layer covering the surface of the metal source electrode, performing ion implantation in the semiconductor epitaxial layer to form an N substrate layer, an N drift layer, an N well layer, a heavily doped P layer and a P well layer; source electrode doping layers are arranged on the two sides of a single MOS cell, the source electrode doping layers are in ohmic contact with the metal source electrodes, and the source electrode doping layers are made of gallium arsenide or gallium nitride or nichrome. According to the invention, the source electrode doping layer with the sinking design is arranged above the MOS cell, so that the N well layer can be in direct contact with the metal source electrode, and the N well layer can be in indirect contact with the metal source electrode through the source electrode doping layer, thereby reducing the ohmic resistance of the N well layer and the metal source electrode, and reducing the heating at the contact position.

The invention discloses a copper-chromium alloy contact part and a preparation method thereof, and belongs to the technical field of contact material processing. The preparation method comprises the steps that a substrate is installed, a cursor is printed on the substrate, and the cursor is consistent with the bottom face of a copper-chromium alloy contact target part in specification; bonding the connecting surface of the base body on the substrate to obtain a connected material; the connecting surface is matched with the cursor on the substrate; the connected material is fixed in a printing bin, infrared laser printing is conducted on the printing face of the base body according to preset laser additive manufacturing parameters, and a copper-chromium alloy contact part printing piece is obtained; and the copper-chromium alloy contact part printing piece is taken out to be subjected to solid solution heat treatment and separation, then groove position and inner hole machining is carried out, and a copper-chromium alloy contact target part is obtained. By means of the method, the high-strength and high-compactness copper-chromium alloy contact can be obtained.

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 belongs to the technical field of steel ball machining, and discloses a high-wear-resistance hot-rolled steel ball and a surface strengthening heat treatment process thereof.The high-wear-resistance hot-rolled steel ball comprises a steel ball body, the steel ball body comprises a surface layer, a transition layer and a core layer, the surface of the core layer is covered with the transition layer, and the surface of the transition layer is covered with the surface layer. Through a reasonable heat treatment process, the uniformity and strength of the steel ball are enhanced, and good support is provided for a surface layer; the surface layer is made of high-chromium alloy steel Cr15, and the surface hardness and wear resistance of the steel ball are remarkably improved due to the high chromium content of the high-chromium alloy steel Cr15. In addition, the surface of the steel ball is further strengthened through carburizing and nitriding treatment, a hard carbonization layer and a hard nitriding layer are formed, and abrasion in the using process is effectively resisted. Through the combined action of the measures, the steel ball can still keep long service life under the severe working condition, and the replacement frequency and the use cost are remarkably reduced.

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 relates to an integrated fracturing fluid flowback and throttling drainage and production downhole tool which comprises a water drainage and gas production assembly, a fracturing fluid flowback assembly and a throttling production assembly from top to bottom, the water drainage and gas production assembly comprises an upper barrel and an expansion alloy upper connector, a silicon-chromium alloy spring and an upper sliding sleeve are arranged in the upper barrel, and a lower sliding sleeve is arranged in the lower barrel. The top end of the silicon-chromium alloy spring is fixed to the bottom end of the expansion alloy upper connector, and the bottom end of the silicon-chromium alloy spring is fixed to the top end of the upper sliding sleeve. The integrated fracturing fluid flow-back and throttling drainage and production downhole tool integrates three functions of fracturing fluid flow-back, throttling production and drainage gas production, is arranged at the tail end of a continuous oil pipe, can sequentially complete three procedures of fracturing fluid flow-back, throttling production and drainage gas production through single-trip continuous oil pipe operation, meets the requirements of rapid pipe lifting, convenient tool replacement and the like, and is suitable for large-scale popularization and application. The current situation that the function of a current downhole tool is single is improved, the tedious steps of frequently pulling a tubular column and replacing the downhole tool are reduced, manpower and material resources are saved, and the natural gas development cost is greatly reduced.

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 belongs to the technical field of rolling, and particularly relates to an anti-decarburization and anti-brittle failure controlled cooling process for a high-silicon-chromium alloy tool steel wire rod. Aiming at the dilemma that the hot-rolled wire rod which contains more than 2.0% of Si, more than 1.1% of Cr, Mo, V and other alloy elements not only meets the decarburization requirement of a product, but also does not have brittle failure of the wire rod, the method comprises the following steps: firstly, determining the cover entering temperature of the hot-rolled wire rod, the cooling speed of the wire rod before the hot-rolled wire rod enters the cover and other key process parameters; and then the method is realized by adjusting the speed of a roller way, the number of opened heat preservation covers after spinning, a fan Jinling device, the air volume of a fan, the spinning temperature and the like, so that the hot rolling structure of the wire rod is a pearlite structure which is not easy to brittle, and meanwhile, the requirement that the decarburization of a product does not exceed 0.55 D (D is the diameter of the wire rod) is met.

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 provides a nickel-chromium alloy target material and a preparation method thereof, and belongs to the technical field of metal target materials. The preparation method of the nickel-chromium alloy target material comprises the following steps that a mold containing nickel-chromium mixed powder is subjected to hot pressing sintering treatment, a nickel-chromium alloy sintered body is obtained, machining is conducted, and the nickel-chromium alloy target material is obtained; wherein the hot pressing sintering treatment comprises three sections of heat preservation, the pressure of the first section of heat preservation is smaller than 1 MPa, the pressure of the second section of heat preservation is 6-10 MPa, and the pressure of the third section of heat preservation is 30-40 MPa. According to the hot pressing sintering treatment process, three-stage heat preservation is adopted, the pressure of each stage in the three-stage heat preservation process is controlled, the oxygen content and the grain size of the nickel-chromium alloy target material are reduced on the basis that the density of the target material is guaranteed, meanwhile, the grain orientation of the nickel-chromium alloy target material is controlled, and the quality of a sputtering film is effectively guaranteed.

The invention discloses a high-strength antioxidant tungsten-copper-chromium composite material and a preparation method thereof, and belongs to the technical field of tungsten-copper composite materials. The mass of the required tungsten metal powder, the mass of the required copper metal powder and the mass of the required chromium metal powder are calculated according to the mass fractions of the designed components, and then weighing and proportioning are conducted for standby application; tungsten metal powder and chromium metal powder are subjected to mechanical alloying through a planetary ball mill to obtain tungsten-chromium alloy powder, then copper metal powder is added, ball milling continues to be conducted, and tungsten-copper-chromium composite powder is obtained; and the obtained tungsten-copper-chromium composite powder is subjected to cold pressing, and then the high-strength anti-oxidation tungsten-copper-chromium composite material is prepared through liquid-phase sintering. According to the preparation method of the high-strength anti-oxidation tungsten-copper-chromium composite material, compared with a tungsten-copper composite material under the same preparation condition, the tensile strength and the oxidation resistance of the prepared tungsten-copper-chromium composite material are synergistically improved.

The invention relates to the technical field of optical fiber sensors, and discloses a preparation process of a high-sensitivity conical optical fiber sensor, which comprises the following steps of: S1, bending and winding an evanescent coupling region of a conical optical fiber on a customized cylinder mold with the radius of 3.183 mm, fixing a bending position by using a high-temperature-resistant adhesive tape, and fixing the distance and the position of a cylinder by using an acrylic plate; and S2, placing the fixed conical optical fiber and the mold on a constant-temperature heating table for low-temperature heating and shaping. According to the preparation process of the high-sensitivity conical optical fiber sensor, glass fiber heating cloth with a silicone rubber coating is selected as a heat source, the fiber cloth is made into a cylindrical heating part, and nickel-chromium alloy heating wires are uniformly arranged between the two layers of glass fiber cloth, so that a stable, uniform and stable heat source at the temperature of 250 DEG C or below can be provided; the strong temperature change of the polymer fiber at the heating junction can be slowed down, and the risk that the cladding and the fiber core of the fiber are separated and even the cladding is broken can be avoided.

The invention discloses a copper-chromium contact with high fusion welding resistance and a preparation method thereof, and belongs to the technical field of contact materials. The preparation method comprises the steps that high-purity electrolytic chromium powder and electrolytic copper powder serve as raw materials, after acoustic resonance powder mixing is conducted, powder upsetting and cold isostatic pressing are conducted in sequence, and a green body is obtained; carrying out gradient sintering and finish machining treatment on the green body to obtain a copper-chromium electrode bar; the copper-chromium electrode bar is subjected to atomization powder making, and copper-chromium alloy powder is obtained; after the copper-chromium alloy powder is sequentially subjected to sheathing, heat treatment, seal welding and hot isostatic pressing sintering, a sheath is removed, and a prefabricated body is obtained; and after the prefabricated body is processed, the surface is remelted by green laser, and the copper-chromium contact with high welding resistance is prepared. According to the method, by improving the purity of the copper-chromium contact and optimizing the morphology and distribution of the chromium particles, the prepared contact is high in purity, the chromium particles are fine and uniform in distribution, the welding resistance and the breaking performance are excellent, and the method is suitable for a high-voltage-grade arc extinguish chamber.

The invention relates to the field of vanadium and chromium separation, and particularly discloses a sodium vanadium solution treatment method which comprises the following steps: S100, adding an alkaline reducing agent into a sodium vanadium solution, and carrying out reduction of hexavalent chromium and selective precipitation reaction of trivalent chromium; s200, at the later stage of the reaction in the step S100, urea is added into a solution system, and a deep removal reaction of silicon and chromium is carried out; and S300, after the reaction in the step S200 is finished, solid-liquid separation is conducted, silicon-chromium slag and purified vanadium liquid are obtained, silicon-chromium oxide is obtained after the silicon-chromium slag is treated and can be used for smelting silicon-chromium alloy, and the purified vanadium liquid is subsequently used for preparing a high-purity vanadium oxide product. According to the method, the vanadium sodium salt solution obtained through a vanadium slag sodium salt roasting-water leaching process is used as a raw material, hexavalent chromium in the solution is reduced through an alkaline reducing agent, selective precipitation separation of hexavalent chromium and vanadium is achieved, and meanwhile urea is supplemented to conduct synergistic precipitation removal on silicon in the solution.

The invention discloses a copper base-copper chromium contact composite material and a preparation method thereof, and belongs to the technical field of copper chromium contact materials. The preparation method comprises the following steps that a nanometer aluminum oxide coating layer is formed on the surface of chromium powder through a sol-gel method, and coated chromium powder is obtained; the coated chromium powder and the copper powder are subjected to vacuum induction gas atomization treatment, and spherical copper-chromium alloy powder is obtained; the spherical copper-chromium alloy powder is printed on the surface of the copper-based material, and a prefabricated body of the copper-based-copper-chromium contact composite material is obtained; and after the contact layer is subjected to hot isostatic pressing treatment, the prefabricated body is subjected to annealing treatment, and the contact is prepared. According to the method, the high conductivity of the base material and the high wear resistance of the contact layer can be coordinated, so that the arc ablation resistance is improved; through the combination of electron beam printing and hot isostatic pressing, the porosity of the material can be remarkably reduced, and the material is suitable for high-performance contact components in the fields of high-voltage switches, rail transit and the like.

The present invention provides a method for producing a molybdenum-vanadium-aluminum-chromium alloy with high uniformity. The composition of the molybdenum-vanadium-aluminum-chromium alloy is as follows: Mo 25% - 28%, V 24% - 27%, Cr 28% - 31%, with the balance being Al, O ≤ 0.05%, C ≤ 0.05%, and the segregation of the main content being < 0.6%. It relates to the field of metallurgical technology. The technological steps are as follows: (1) Prepare an ammonium molybdate-ammonium dichromate-ammonium metavanadate precursor by hydrothermal method using sodium molybdate, sodium metavanadate, sodium dichromate, and ammonium chloride; (2) Perform high-temperature treatment on the precursor to obtain a MoO3 / V2O5 / CrO3 composite material; (3) Mix the MoO3 / V2O5 / CrO3 composite material, refined aluminum powder, and calcium oxide in proportion, load them into a furnace and ignite to undergo a thermite reaction to obtain a molybdenum-vanadium-aluminum-chromium alloy ingot. Compared with the molybdenum-vanadium-aluminum-chromium alloy produced by the traditional thermite method, the uniformity of the present invention is greatly improved, and it can be used for the production of titanium alloys such as TB2, TB9, TB15, and TB16.

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 discloses an improved LSTM (Long Short Term Memory)-based method and device for predicting a corrosion behavior of an iron-chromium alloy in a closed environment. The method comprises the following steps: acquiring corrosion dynamics experimental data of the iron-chromium alloy; based on the improved LSTM model, constructing an iron-chromium alloy corrosion model; the corrosion kinetics experimental data are input into the ferrochromium alloy corrosion model, and corrosion kinetics prediction data are obtained; based on the improved LSTM model, combining physical constraint conditions to construct an iron-chromium alloy oxidation weight gain prediction model; obtaining a weight change prediction value and an oxidation rate prediction value of the iron-chromium alloy through the iron-chromium alloy oxidation weight increment prediction model; and obtaining the corrosion behavior of the ferrochromium alloy according to the corrosion kinetics prediction data, the weight change prediction value and the oxidation rate prediction value. The method can improve the accuracy of iron-chromium alloy corrosion behavior prediction, and can be widely applied to the technical field of machine learning.

A method for extracting metals from saprolite lateritic nickel ore, comprising: subjecting saprolite lateritic nickel ore to ore dressing and ore milling, so as to obtain lateritic nickel ore powder; mixing the lateritic nickel ore powder, water, an acid and a reducing agent and performing normal-pressure acid leaching, so as to obtain a leaching residue and a leachate; adding a soluble fluoride salt and sodium salt into the leachate so as to obtain a silicon-aluminum residue and a silicon and aluminum-removed liquid; adding a phosphorus source into the silicon and aluminum-removed liquid, and performing solid-liquid separation to obtain ferric phosphate and a post-iron-precipitation liquid; performing primary cyclone electrolysis on the post-iron-precipitation liquid, so as to obtain a zinc-chromium alloy and a post-primary-cyclone-electrolysis liquid; performing secondary cyclone electrolysis on the post-primary-cyclone-electrolysis liquid, so as to obtain a nickel-cobalt alloy, manganese oxide and a post-secondary-cyclone-electrolysis liquid; and adding sodium carbonate into the post-secondary-cyclone-electrolysis liquid to perform a precipitation reaction, so as to obtain magnesium carbonate and a post-magnesium-precipitation liquid. The method achieves short-process separation and extraction of different valuable metal elements such as zinc, chromium, nickel, cobalt and manganese from saprolite lateritic nickel ore, and is an economical, efficient, green and environment-friendly extraction technique.

The invention relates to a drainage type heating plate suitable for tunnel ice melting. The drainage type heating plate is characterized by comprising a radiation heating plate and a drainage plate, the radiation heating plate and the drainage plate are fixed together through screws and are mounted on the tunnel wall, so that the radiation surface of the radiation heating plate faces upwards or outwards; a flow guide hole is formed in the radiation heating plate, a flow guide plate is mounted below the radiation heating plate, and water after ice melting is guided to one side by the flow guide plate; the radiation heating plate is a carbon fiber radiation heating plate or a nichrome radiation heating plate. The drainage type heating plate which is good in heating effect and suitable for tunnel ice melting overcomes the defect that the heating effect is poor due to the fact that the wall surface is uneven, and secondary disasters caused by the fact that water flows to a pull wire or a steel rail are prevented.

The invention belongs to the field of copper-chromium alloys, and particularly relates to a copper-chromium-zirconium-scandium alloy plate strip and a preparation method thereof. The copper-chromium-zirconium-scandium alloy plate strip consists of the following components in percentage by mass: 0.7-0.8% of Cr, 0.03-0.1% of Zr, 0.03-0.1% of Sc, less than or equal to 0.05% of impurity components such as Al, Si, Fe and Sn, and the balance of Cu. According to the method, through the cooperation of the Sc element and the grain boundary pinning effect of Zr and the combination of an appropriate heat treatment process, good regulation and control over the alloy structure are achieved, the inversion relation between the strength and the electric conductivity of a traditional copper alloy is broken through, and the copper alloy plate strip with the excellent mechanical property, the electric conduction and heat conduction performance and the high-temperature softening resistance is obtained; and the requirements of IC lead frames and nuclear energy heat sink materials on high-performance copper alloy can be met.

The utility model provides a nested type grinding roller structure which comprises an assembling layer, a connecting layer and a grinding layer which are sequentially arranged in an annular nested mode from inside to outside, and concave-convex structures in the horizontal direction and the vertical direction are arranged on the outer surfaces of the assembling layer and the connecting layer respectively. The minimum inner diameter of the inner surface of the grinding layer is larger than the maximum inner diameter of the outer surface of the assembly layer. Cheap carbon steel is used in the inner layer, high-chromium alloy with high cost is used in the outer layer, and the problems of high cost, waste of raw materials and the like in the abrasion replacement process due to the fact that the whole body is cast by using the high-chromium alloy are solved; after the fixing of the assembly layer and the grinding layer is removed, the assembly layer can be taken out from the axial direction and replaced with a new grinding layer, so that a new assembly layer does not need to be cast again, the processing time of a new product is saved, the replacement efficiency is improved, and meanwhile, the cost is reduced to a certain extent by repeatedly using the assembly layer.

The invention relates to a high-qualified-rate production method of a disc spring, which is applied to the field of disc springs, and comprises the following steps: raw material selection: selecting a round high-temperature-resistant nickel-chromium alloy stainless steel disc spring as a raw material disc of the disc spring, and selecting the diameter of the raw material disc which is more than 5mm greater than the diameter of a disc spring part; and the thickness of the disc is turned, specifically, according to the material, the compression amount and the pressure index of the disc spring, the expected thickness needed for machining the disc spring is calculated, and the error between the expected thickness and the actual thickness is controlled to be positive 0.5-1 mm. The whole belleville spring can meet the requirement of a higher-temperature environment, it is effectively guaranteed that the belleville spring can work stably in the high-temperature environment, the service life is prolonged, the mechanical property is enhanced, the percent of pass of each belleville spring is kept and improved, the problem that the overall characteristic precision of the belleville spring is reduced is avoided, and the production efficiency is improved. And the smoothness of the surface of the belleville spring is guaranteed, and the problem of damage caused by self friction of the belleville spring is solved.

The invention discloses a high-temperature-resistant special high-frequency flexible cable and a preparation method thereof. Relates to the technical field of special high-frequency cables for high-end equipment manufacturing. The special high-frequency cable comprises a conductor, an insulating layer, an inner shielding layer, an outer shielding layer and a sheath layer which are sequentially arranged from inside to outside, the conductor is of a single-wire structure or a multi-wire stranded structure; a wire forming the conductor is composed of a copper wire core and a chromium plating layer or a chromium alloy plating layer plated outside the copper wire core. The insulating layer is of an extruded structure formed by foaming type modified polyimide materials outside the conductor; the inner shielding layer is an overlapped wrapping structure of a chromium-plated alloy temperature-resistant metal belt outside the insulating layer; and the outer shielding layer is a braided structure with silver-plated nickel-silicon alloy wires outside the inner shielding layer. The flexible cable has excellent electrical signal transmission stability, high temperature resistance and flexible bendability, can be effectively applied to aerospace working conditions, can be repeatedly used for a long time in the working conditions, and is safe and reliable.

This application relates to the technical field of metal heating materials, and specifically, to a metal heating film, and a preparation method and use thereof. In this application, at least one of elements Ru, Pt, and Pd is introduced into a nickel-chromium alloy or a nickel metal to form an alloy with the nickel-chromium alloy or the nickel metal, improving the resistance of the obtained metal heating film to high-temperature corrosion by e-liquid, and reducing the content of Ni, Cr, and other elements in smoke. In addition, after the introduction of the elements Ru, Pt, and Pd, these elements can form the alloy with Ni, Cr, and other elements, which helps melting. In this case, the sintered heating film is denser and more resistant to thermal shocks of the e-liquid, and the heating film is less likely to crack and fail during smoking. Moreover, these elements have a modifying effect on the microstructure of the surface of the heating film, so that various components in the e-liquid can be atomized in a more coordinated manner, leading to better consistency in taste.

The present invention relates to the technical field of stainless steel preparation, and in particular to a high-strength stainless steel casting and a preparation process thereof. In order to improve the strength and corrosion resistance of the stainless steel casting, the present invention limits the content of each component of the blank and increases the amount of chromium added thereto when preparing the stainless steel casting. Subsequently, iron and chromium elements are melted to prepare high-chromium alloy powder, and a transition coating is clad on the surface of the stainless steel blank using the high-chromium alloy powder as the main material. The iron-chromium ratio in the transition coating is 7:(2-4), which is slightly higher than the iron-chromium ratio in the stainless steel blank. The transition coating can effectively alleviate the stress caused by the large component gap between the wear-resistant coating and the stainless steel blank. In addition, the higher chromium element can effectively improve the stability of TiC and WC carbides, prevent the decomposition of carbides, and inhibit the graphitization tendency of carbon, thereby maintaining the stability and hardness of the coating and improving the corrosion resistance of the material coating.