13 results about "Nicr alloy" patented technology

The invention discloses a nano ceramic reinforced metal-based coating and a preparation method and application thereof, and belongs to the technical field of electromagnetic rail gun guide rail materials, a first NiCr alloy is used as a base coat, a second NiCr alloy with the first TiN ceramic phase content gradually increased is used as a transition layer, and a third NiCr alloy with the second TiN ceramic phase uniformly distributed is used as a protective layer. And the nano-ceramic reinforced metal-based coating is obtained through magnetron sputtering. The second NiCr alloy with the first TiN ceramic phase content gradually increased is deposited on the surface of the base layer to serve as the transition layer, continuous transition of the thermal expansion coefficient, the elastic modulus and the hardness between the coating and the substrate is achieved, and the coating has high bonding strength. The NiCr alloy is low in hardness and wear resistance, and a high-hardness TiN nitride nano ceramic phase is introduced into the NiCr alloy, so that multiple characteristics of electric conduction, heat conduction, wear resistance and arc ablation resistance of the coating material are realized, and the service life of the guide rail is prolonged.

The application relates to the technical field of NiCr alloy surface modification, in particular to a Ni20Cr alloy and a preparation method and application thereof. The method comprises the following steps: annealing treatment is performed on a Ni20Cr alloy base material to obtain annealed Ni20Cr alloy, then surface pretreatment is performed to obtain recrystallized Ni20Cr alloy; subsequently, deep cold ultrasonic shot blasting treatment is performed on the recrystallized Ni20Cr alloy to obtain the Ni20Cr alloy. By constructing a gradient nanotwin structure on the surface of the Ni20Cr alloy, the mechanical properties and high-temperature oxidation resistance are synergistically improved. The gradient nanotwin structure not only endows the Ni20Cr alloy with excellent strength-plasticity matching, but also exhibits significant oxidation resistance in a high-temperature service environment, and the problems existing in the prior art are overcome.

Surface Heating Element and Manufacturing Method. This invention relates to a surface heating element that generates heat using electricity and a method for manufacturing the same. One embodiment of the invention provides a surface heating element comprising a NiCr alloy, having an adhesion strength of 3N or more relative to a substrate or insulating layer, and a resistivity of 10⁻⁶. ‑4 Ωcm to 10 ‑2 With a strength of Ωcm, this surface-type heating element can be used even at high operating temperatures above 400°C. It suppresses material release, has high fracture toughness, low coefficient of thermal expansion, and heat resistance, thereby improving product reliability and lifespan.

The utility model relates to the technical field of nichrome cutting, in particular to an automatic nichrome electric heating wire cutting machine which comprises a device body, an input roller is installed on one side of the device body, a limiting disc is connected to the outer side of the input roller, a limiting rod is arranged on the upper side of the input roller, and a pressing disc is installed on the limiting rod. A supporting frame is installed on the device body, a lifting frame is movably connected to one side of the supporting frame, a collecting frame is arranged on the bottom side of the lifting frame, cooling boxes are installed on the two sides of the collecting frame, and an output roller is arranged on the other side of the device body. According to the scheme, the possibility that materials deviate in the conveying process is reduced, the possibility that the temperature of a heating wire is continuously transmitted to the device body to affect object conveying is reduced, the waste residue collecting effect of the device in the cutting process is improved, waste residues are prevented from being adhered to a high-temperature area, the contact type cutting effect of the device is also improved, and the cutting efficiency is improved. And the possibility of mistaken touch and failure is avoided.

This invention discloses a method for preparing NiCr alloy sputtering targets, belonging to the field of powder metallurgy technology. The preparation method is as follows: S1, by weight percentage, Ni powder is 38-42 wt% and Cr powder is 58-62 wt%; S2, zirconium balls are added to the raw material at a weight ratio of 1:6 in a mixing tank, argon gas is introduced, and the mixture is then mixed in a ball mill; S3, after the NiCr alloy powder is loaded into a mold, it is pre-pressed in a furnace to 5-8 MPa, held for 5-10 minutes, and then depressurized; a vacuum is drawn to below 10 Pa, and the temperature is raised to 1150-1200℃ in three stages, then held at that temperature and pressurized at a uniform rate to 30-40 MPa. After sintering, a NiCr alloy target blank is obtained, which is then machined to obtain a NiCr alloy target of suitable size. The NiCr alloy target prepared by this invention has low oxygen content, high relative density, and uniform grain size, effectively ensuring the quality of the sputtered film.

The invention relates to the technical field of alloy coating materials, and particularly discloses an anti-oxidation coating for a high-pressure hot-pressing mold and a preparation method of the anti-oxidation coating. The high-pressure hot-pressing mold anti-oxidation coating comprises a transition layer and a functional layer which are sequentially arranged from a mold base body to the outside, the transition layer is a TiN-SiC gradient composite layer, the functional layer takes Al2O3-NiCrAlY as a base body, and nano ZrB2 and rare earth CeO2 which are subjected to double modification treatment are compositely doped; and the dual-modified nano ZrB2 is ZrB2 particles which are coated with a silane coupling agent KH-560 and a NiCr alloy. The anti-oxidation coating of the high-pressure hot-pressing mold has both oxidation resistance and wear resistance, and the high-temperature hardness stability and wear resistance of the anti-oxidation coating are effectively enhanced.

The application belongs to the technical field of additive manufacturing, and particularly relates to an inner hole laser cladding composite powder material and a preparation method thereof. In order to solve the problems of poor uniformity and flowability of the inner hole laser cladding composite powder material in the prior art and the limitations in hardness, wear resistance and corrosion resistance, the application provides an inner hole laser cladding composite powder material and a preparation method thereof. The material comprises tungsten carbide powder, NiCr alloy powder, silver and a mixed crystal of calcium fluoride and barium fluoride, is mixed and ball milled, is pre-sintered and then ball milled again, is then subjected to gas atomization treatment and laser pretreatment, and finally a nickel plating layer is formed on the surface of the powder through chemical plating. The composite powder material has high hardness, high wear resistance, good corrosion resistance and high temperature stability, is suitable for inner hole laser cladding, and significantly improves the service life and performance of a workpiece.

The utility model provides a shell of a shell and tube heat exchanger with a nichrome medium tube set. The shell comprises a first shell plate, a second shell plate, a third shell plate and a fourth shell plate. The first shell plate, the second shell plate, the third shell plate and the fourth shell plate are enclosed and are connected through solder to form a shell; the cross sections of the first shell plate, the second shell plate, the third shell plate and the fourth shell plate are arranged in an arch shape. According to the utility model, the plurality of groups of shell plates made of metal materials are assembled to form the shell, so that the shell has higher loading capacity. The first end face and the third end face of the shell plate respectively extend towards the second end face, intersect with the second end face and are integrally arranged, so that the cross section of the shell plate made of metal materials is in an arch shape, and then the local geometric curvature is enhanced; at the moment, the shell plate with the arched cross section is beneficial to uniformly distributing pressure to different parts of the shell plate, so that stress concentration is reduced, and local deformation is prevented.

The utility model provides a flow collecting cover of a shell and tube heat exchanger provided with a nichrome medium tube set. The flow collecting cover comprises at least one set of first flow collecting cover, second flow collecting cover and third flow collecting cover and a tube plate. The first flow collecting cover, the second flow collecting cover and the third flow collecting cover are each provided with a flow collecting cover shell, and a groove body is formed in the tube plate. The flow collecting cover shell extends into the tank body, and a brazing filler metal filling layer is arranged between the outer wall, extending into the tank body, of the flow collecting cover shell and the tank body. The groove body is formed in the tube plate, and the brazing filler metal filling layer is matched with the tube plate and the flow collecting cover, so that connection between the flow collecting cover and the tube plate is achieved; therefore, the second flow collecting cover is additionally arranged, a U-shaped connector of a traditional range extending pipeline is replaced by the additionally arranged second flow collecting cover, installation is easy, when integrated welding is carried out in a brazing furnace, all welding spots are concentrated on the pipe plate, the number of the welding spots is reduced, and then the probability of leakage points is greatly reduced.

The application relates to the technical field of alloy coating materials, and particularly discloses a high-pressure hot-pressing die oxidation-resistant coating and a preparation method thereof. The high-pressure hot-pressing die oxidation-resistant coating comprises a transition layer and a functional layer arranged outward from a die base body, the transition layer is a TiN-SiC gradient composite layer, the functional layer takes Al2O3-NiCrAlY as a base body, and is compounded and doped with double-modified nano ZrB2 and rare earth CeO2; the double-modified nano ZrB2 is ZrB2 particles coated with a silane coupling agent KH-560 and a NiCr alloy. The high-pressure hot-pressing die oxidation-resistant coating has oxidation resistance and wear resistance, and effectively enhances the high-temperature hardness stability and wear resistance of the oxidation-resistant coating.

The application relates to the technical field of mechanical transmission devices, in particular to a high-wear-resistance crankshaft and a 3D printing preparation method thereof. The crankshaft comprises a crankshaft eccentric shaft crank, a counterweight connecting disc between the shaft cranks, a crankshaft eccentric shaft bearing positioning table, a large gear ring mounting table and a load bearing mounting table, adopts a composite structure of a 40CrNiMoA / 17-4PH high-strength base matched with a 3D-printed wear-resistant layer, deposits WC-Co hard alloys or Cr3C2-NiCr alloy wear-resistant layers on key working surfaces respectively, and the preparation process comprises base preparation, 3D-printed wear-resistant layer deposition, sand blasting treatment and special heat treatment and finishing suitable for different production requirements, and the core process parameters of each procedure are optimized; the application solves the problems of traditional crankshafts, such as easy stress concentration, fast wear and short service life, the wear rate of the wear-resistant layer is reduced to below 0.02 mm / 1000h, the service life of the crankshaft is prolonged to above 20000h, the performance and cost are considered, and the application is suitable for various transmission working conditions and gear specifications.

The invention relates to the technical field of metal materials, and provides a nickel-chromium-tantalum-aluminum quaternary alloy sputtering target material and a preparation method thereof.The preparation method comprises the steps that NiCr pre-alloyed powder is obtained through a NiCr alloy ingot; crAl pre-alloyed powder is obtained through the CrAl alloy ingot; the NiCr pre-alloyed powder, the CrAl pre-alloyed powder, the Ta powder and the Cr powder are subjected to mechanical ball milling and mixing, and NiCrTaAl alloy powder is obtained; filling a steel ladle sleeve with the alloy powder; argon arc welding and sealing are conducted on the steel ladle sleeve, a vacuum degassing pipe is welded to the steel ladle sleeve, and vacuum thermal degassing is conducted through a degassing furnace; the steel ladle sleeve is subjected to hot isostatic pressing treatment through the hot isostatic pressing technology, and a NiCrTaAl alloy target blank is obtained; and the steel ladle sleeve is removed, and the NiCrTaAl alloy target material for sputtering is obtained. The nickel-chromium-tantalum-aluminum quaternary alloy sputtering target material with the density close to the theoretical density, uniform structure distribution, fine crystal grains and low processing difficulty can be obtained.

The utility model discloses a rapid-heating heating furnace for surfacing of a blast-furnace tuyere, relates to the technical field of heating furnaces, and aims to solve the problems that an existing heating furnace lacks an internal heat radiation reflection structure and function, and the overall heating speed needs to be increased. An upper cover is installed on the upper end opening of the outer furnace body in a covering and buckling mode, a ceramic plate is installed on the inner side of the upper cover in a clamped mode, a nichrome plate is riveted to the outer surface of one side of the ceramic plate through rivets, an interlayer between the ceramic plate and the upper cover is filled with rock wool blocks, and an inner furnace body is installed on the inner side of the outer furnace body. An arc-shaped heating groove is formed in the upper surface of the inner furnace body, a plurality of mounting grooves are formed in the inner wall of the arc-shaped heating groove, and resistance heating pipes are mounted in the mounting grooves in a buckled mode. And the effects that internal heat radiation can be reflected, waste of heat energy is avoided, and the heating speed can be effectively increased are achieved.