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.