1817results about "Solid state diffusion coating" patented technology

The invention relates to a preparation method and system for an atomic gas chamber for sapphire coating, and the preparation method comprises the steps: S1, placing a cleaned atomic gas chamber on a heating base station of a reaction chamber, and filling the reaction chamber with replacement gas to discharge residual gas in the reaction chamber; s2, filling aluminum source gas into the reaction chamber, and carrying out chemical adsorption on the wall surface of the atomic gas chamber to form a first film layer; s3, filling replacement gas into the reaction chamber to discharge residual aluminum source gas in the reaction chamber; s4, filling oxide gas into the reaction chamber to oxidize the first film layer and convert the first film layer into an aluminum oxide film layer; s5, filling replacement gas into the reaction chamber to discharge residual oxide gas in the reaction chamber; and S6, repeating the steps S2 to S5 to form a preset number of aluminum oxide film layers with a preset thickness on the wall surface of the atomic gas chamber so as to form the atomic gas chamber with the sapphire coating film. The anti-shielding capability of the alkali metal atomic gas chamber can be enhanced, and the electromagnetic wave precision measurement performance of the atomic gas chamber is improved.

The invention discloses a regulation and control process for a nitridation gradient permeable layer of a die-casting special-shaped die, and belongs to the technical field of die nitridation, and the regulation and control process comprises the following steps: S1, carrying out three-dimensional quantitative analysis on the die to obtain three-dimensional information of the die, and dividing the surface of the die into regulation and control areas of four grades of A, B, C and D; s2, regulation and control area parameter mapping: calling a corresponding basic process parameter set from a preset process parameter mapping table according to different grades of the regulation and control area; s3, mold partition ion nitriding; s2, an ion nitriding furnace with multiple paths of independent control anodes and partitioned gas conveying nozzles is arranged, the mold is placed in the nitriding furnace, the process parameter sets, obtained in the S2, of all the regulation and control areas are distributed to a partitioned gas conveying control system and an anode power supply system to conduct permeation on the mold, and the mold is cooled to the room temperature; the industrial problems that due to the fact that geometrical characteristics of a special-shaped mold are complex, the infiltrated layer thickness is not uniform, and the structure property difference is large are solved, and the infiltrated layer with the enough thickness can be obtained in areas difficult to infiltrate such as deep cavities and narrow slits.

The invention discloses a coated titanium anode and an embedding preparation method thereof, and belongs to the technical field of coated titanium anodes, metal salt powder, an organic additive and inert filler are fully mixed to form embedding agent powder, the mass fraction of metal salt is 45-59%, the mass fraction of the organic additive is 1-5%, and the mass fraction of the inert filler is 40-50%; the sintering treatment is as follows: the pretreated titanium substrate is completely immersed in the embedding agent powder, the sintering temperature is 400-600 DEG C, the sintering time is 1-3 hours, and the heating rate is 5-10 DEG C / min. According to the method, low-temperature sintering is realized by precisely regulating and controlling the components and the proportion of the embedding medium and combining process parameters such as low-temperature sintering, and the damage to a titanium substrate is avoided; and meanwhile, the coating binding force of the titanium anode is improved, the service life of the titanium anode is prolonged, and technical innovation and industrial value are achieved.

The invention discloses a copper-molybdenum alloy component and a manufacturing method thereof, and belongs to the technical field of alloy manufacturing. Mo powder is sequentially subjected to vacuum drying treatment, oxidation-reduction treatment and coating treatment, so that the Mo powder has good flowability and powder laying uniformity; under the preset 3D printing condition, the porous Mo framework which is stably formed and complex in structure can be obtained, the problems that an existing rolling composite method is complex in technological process, strict in technological requirement and the like are solved, and the method is suitable for manufacturing parts with small sizes or complex shapes; the porous Mo framework is subjected to vacuum thermocuring and Cu infiltration treatment, and the obtained copper-molybdenum alloy component is excellent in compactness, high-temperature stability, interface bonding strength, heat conduction, electrical conductivity and the like. The problems that a copper-molybdenum alloy obtained in the prior art is poor in wettability and low in density and uniformity, and the mass content of copper is lower than 30%, so that the heat conductivity, the electric conductivity, the air tightness and other performance are low are solved.

The embodiment of the invention discloses a gas phase infiltration device applied to a turbine blade. According to one specific implementation mode, the device comprises a lower base, a preheating chamber, a transition supporting seat, a multi-stage gas distribution chamber and an upper base which are coaxially arranged, the lower base is connected with a gas inlet pipeline, and mixed gas circulates in the gas inlet pipeline; the preheating chamber is arranged at the top end of the lower base, aluminum particles are contained in the preheating chamber, and the mixed gas enters the preheating chamber through the lower base and reacts with the aluminum particles to form process gas; the transition supporting seat is arranged at the top end of the preheating chamber; the multi-stage gas distribution chamber is arranged at the top end of the transition supporting seat and is connected with the preheating chamber; turbine blades are fixed in the multi-stage gas distribution chamber; the upper base is arranged at the top end of the multi-stage gas distribution chamber, the upper base is provided with a gas outlet hole, and process gas penetrates into the surface of the turbine blade through the multi-stage gas distribution chamber and is finally discharged through the gas outlet hole. According to the embodiment, the production efficiency can be improved.

The invention relates to the technical field of pipeline steel for oil and gas transmission, in particular to a novel low-C low-Cr corrosion-resistant pipeline steel plate, a preparation method and a pipeline steel pipe, and the novel low-C low-Cr corrosion-resistant pipeline steel plate comprises the following chemical elements: less than or equal to 0.03 wt% of C, less than or equal to 0.025 wt% of Sb, 0.50-1.20 wt% of Al, 0.0005-0.0012 wt% of Mg, 0.0012-0.0042 wt% of Ca, less than or equal to 0.50 wt% of Cr, 0.10-0.30 wt% of Ni, 0.10-0.30 wt% of Si, 1.20-1.80 wt% of Mn, 0.10-0.30 wt% of Mo, 0.02-0.06 wt% of Nb, 0.03-0.08 wt% of V, 0.01-0.03 wt% of Ti, less than or equal The manufactured steel plate is low in manufacturing cost, excellent in yield strength, tensile strength, ductility, impact toughness, corrosion resistance, hydrogen induced cracking resistance and other mechanical properties and suitable for seabed and land oil and gas conveying pipeline engineering in the high Cl <-> and CO2 / H2S corrosion environment.

The invention belongs to the field of hard alloy materials, and provides a modified high-performance non-magnetic hard alloy and a preparation process thereof. The surface of a WC particle is chemically plated with a Ni-P-B-Cr-Cu amorphous shell layer, and a binding phase is converted into Ni3P and Ni3B nanophase through two-stage sintering. The WC alloy comprises the following components in parts by weight: 85-95 parts of WC, 12-25 parts of a binding phase and 0.5-1.4 parts of a grain growth inhibitor, the nanophase accounts for 35-50% of the volume of the binding phase and 35-50% of the total volume of the binding phase, and the grain size is 80-125 nm; the average grain size of WC is 0.6-1.0 [mu] m; and the thickness of an interface P enrichment layer is 8-15 nm (the coverage rate is 85-95%). Through interface engineering and controlled crystallization from amorphous to nanocrystalline, the relative magnetic conductivity is 1.001-1.015, the hardness HRA is 90.5-93.0, the strength TRS is 2.2-3.0 GPa, the toughness KWP is 300-450 N / mm, and the magnetic saturation strength is 0.02-0.15 T. The problem of decoupling of the magnetic property and the mechanical property of a traditional non-magnetic hard alloy is solved, and the non-magnetic hard alloy is suitable for magnetic sensitive environments such as semiconductor equipment, precise measurement, MRI tools and oil service logging.

To provide a component that enables suppression of strength degradation in an excess carburized portion, including degradation of impact resistance and bending fatigue characteristics.SOLUTION: A vacuum carburizing steel containing, in mass%, C: 0.15-0.30%, Si: 0.70-1.20%, Mn: 0.90-3.00%, Cr: 0.50-1.50%, Mo: 0.10-1.00%, Al: 0.020-0.050%, Nb: 0.020-0.100%, and N: 0.0100-0.0300%, the balance being Fe and unavoidable impurities, wherein P and S among the unavoidable impurities satisfy P: 0.030% or less and S: 0.030% or less, and formulas A, B, C, and D: A: 0.12≤3[Al]+4[Nb]≤0.50, B: 0.20≤[N] / [Al]≤0.80, C: 5.0≤3[Si] / 0.5[Cr], D: 1.95≤-2[Si]+3[Mn]+[Cr]+2[Mo], are all satisfied.SELECTED DRAWING: Figure 1

The present disclosure relates generally to creating metal carbide parts or parts with metal carbide layers. In some aspects, the present disclosure relates to converting metal parts to metal carbide parts or parts with metal carbide layers. In other aspects, the present disclosure relates to metal-impregnated coatings that may be used to form metal carbide layers on parts. In yet other aspects, the present disclosure relates to metal-impregnated resins being used as material for 3D printing, casting, or coating disposable substrates, or otherwise forming objects that become standalone ceramic parts upon heat treatment and carburization of the metal.

The invention relates to a core-shell structure whisker toughened hard alloy. The core-shell structure whisker toughened hard alloy comprises a hard alloy matrix and a core-shell structure whisker, the core-shell structure whisker comprises a tungsten core part and an outer tungsten carbide shell layer. According to the core-shell structure whisker toughened hard alloy provided by the invention, the core-shell structure whiskers are added into the hard alloy, and the obdurability of the hard alloy is improved by utilizing the obdurability of the tungsten core part; the outer tungsten carbide shell layer is utilized, the hardness of the whisker is improved, the carbon content of a hard alloy system can be balanced in the sintering process, the wettability between the whisker and a hard alloy matrix is improved, sintering densification is promoted, and the interface bonding force between the whisker and the hard alloy matrix is improved. And finally, the strength and toughness of the hard alloy are improved on the premise of not obviously reducing the hardness of the hard alloy.

The invention discloses a gradient coating preparation method combined with a gas phase aluminizing process, and relates to the technical field of thermal spraying, and the gradient coating preparation method comprises the following technological processes: S1, carrying out sand blasting treatment on a common gas turbine hot part material GH3536, and then carrying out transferred arc activation treatment on the sand-blasted surface by using vacuum plasma equipment; s2, Ni < 23 > Co < 20 > Cr < 12 > Al < 4 > Ta < 0.6 > Y powder is sprayed; s3, spraying of Ni < 23 > Co < 20 > Cr < 10 > Al < 0.6 > Y powder is conducted; s4, spraying of Ni20Cr10Al powder is carried out; s5, Ni5Al powder is sprayed; s6, a beta-NiAl layer containing an Al2O3 protective film is prepared on the surface of the coating and the surface of the part through the gas phase aluminizing technology; gradient coatings with different components are prepared through atmospheric plasma spraying, and finally a beta-NiAl layer containing an Al2O3 protective film is formed on the surfaces of the gradient coatings through gas phase aluminizing.

The invention discloses a preparation method of a molten salt corrosion resistant coating on the surface of a TiAl alloy, relates to the technical field of surface treatment, and aims to solve the technical problems of low binding force between an existing TiAl alloy matrix and a coating interface and poor corrosion resistance of the coating. The preparation method of the molten salt corrosion resistant coating on the surface of the TiAl alloy comprises the steps that a Zr-Y alloy is infiltrated on the surface of the TiAl alloy through a double glow plasma method, and a Zr-Y infiltrated layer is formed on the surface of the TiAl alloy; the TiAl alloy is subjected to heat preservation for 1-5 hours under the condition that the temperature ranges from 850 DEG C to 900 DEG C; a Zr-Cr-Y alloy is infiltrated on the surface of the TiAl alloy, and a Zr-Y / Zr-Cr-Y infiltrated layer is formed on the surface of the TiAl alloy; the TiAl alloy is subjected to heat preservation for 2-3 hours under the condition that the temperature ranges from 900 DEG C to 950 DEG C, and is oxidized under the condition that the temperature ranges from 860 DEG C to 920 DEG C;

The utility model discloses a zinc impregnation furnace with a multipoint temperature acquisition wireless transmission and temperature control device, which is characterized in that a plurality of independently controlled heating devices are arranged in a hearth of the zinc impregnation furnace along the length direction, a furnace core is provided with a plurality of heating sections, a multipoint temperature measuring thermocouple is arranged in the furnace core, and each temperature measuring point corresponds to one heating section; the multi-point temperature measuring thermocouple is connected with the wireless transmitter, a wireless receiver, a signal distributor, a PIC controller and a heating device controller are arranged in the control cabinet, a temperature display instrument is arranged on the control cabinet, the wireless receiver is connected with the signal distributor, the signal distributor is connected with the PIC controller and the heating device controller, and the heating device controller is electrically connected with the heating device. The plurality of temperature measuring points are arranged in the furnace core, the temperature measuring points are used for measuring the temperature of the heating section, and the heating device controller is used for timely controlling and adjusting the working state of the heating device according to the measured temperature, so that the temperature in the furnace core is uniform, and the zinc impregnation quality of a workpiece is improved.

The invention relates to the field of suspension plasma spraying, in particular to a long-service-life suspension plasma spraying thermal barrier coating based on a platinum-aluminum coating and a preparation method of the long-service-life suspension plasma spraying thermal barrier coating. The preparation method comprises the following steps: preparing a vertical crack or columnar-like structure ceramic layer on the surface of a platinum modified aluminide bonding layer with lower roughness by using suspension slurry prepared from fully-stable tetragonal phase yttrium oxide stabilized zirconium oxide powder and adopting suspension plasma spraying suspension, so as to obtain a thermal barrier coating system with long service life. The problems that in the prior art, due to stress existing between a ceramic layer prepared through plasma spraying and a low-roughness platinum modified aluminide bonding layer, cracks are continuously formed and expanded at an interface, and the service life of a thermal barrier coating system is short are solved. The long-life thermal barrier coating system can be prepared on the platinum modified aluminide bonding layer through suspension plasma spraying.

The invention belongs to the technical field of aluminum alloy surface treatment, and particularly relates to a composite gradient preparation method of an aluminum alloy surface wear-resistant coating, which comprises the following steps: pretreating the aluminum alloy surface, preparing an injection layer with the thickness of 0.05-0.09 mm by adopting a supersonic gas power injection technology, and preparing a transition layer with the thickness of 0.5-0.8 mm by adopting a cold spraying technology, the transition layer is subjected to post-treatment by adopting a laser diffusion technology, and finally, alloy coated powder is cladded on the surface of the transition layer by adopting an ultra-high-speed laser cladding technology, so that the wear-resistant coating with the thickness of 0.7-1.2 mm is prepared; by means of the method, the problems that in the existing aluminum alloy laser cladding layer preparation process, the laser reflectivity is high, a molten pool cannot be effectively formed, the cladding layer dilution rate is high, and air hole defects exist are solved.

The invention discloses an aluminum pipe, a heat exchanger and application thereof, and belongs to the technical field of heat exchange materials. The aluminum pipe comprises an aluminum pipe base material layer and a zinc impregnation layer arranged on the surface of the aluminum pipe base material layer. The zinc impregnation layer has a zinc concentration gradient which is gradually reduced from outside to inside; the maximum zinc concentration of the zinc impregnation layer is 0.01 to 10 weight percent; the thickness of the zinc impregnation layer is larger than 0 and smaller than or equal to 400 micrometers. The zinc impregnation layer is formed on the surface of the aluminum pipe base material layer, corrosion can be limited from expanding to the inner layer, longitudinal expansion of corrosion is avoided, pitting corrosion is inhibited, the zinc content distribution of the zinc impregnation layer at different zinc impregnation depths can be controlled by controlling the maximum zinc concentration and thickness of the zinc impregnation layer, and the corrosion resistance of the aluminum pipe is improved. The zinc impregnation layer has a good anodic protection effect on the aluminum pipe, pitting corrosion extension is effectively inhibited, the corrosion resistance of the aluminum pipe is improved, and the service life of the aluminum pipe is prolonged.

The invention relates to the technical field of plasma application, and discloses a plasma composition control method, which comprises the following steps of: setting the range of a current change rate and adjusting the change rate of a power supply output current; designing a control algorithm based on a dynamic response model between the current change rate and the plasma reaction; a feedback control system is configured based on the plasma state monitored in real time; in the judgment process, when blockage is carried out, the plasma state is adjusted by detecting various process parameters, and the current change rate and the various process parameters are optimized according to the detection result in the adjustment process. By introducing the current change rate, namely the current acceleration, as a key control parameter, regulation and control of the plasma particle density and charge distribution by the current are realized, a plasma composition regulation effect which is more efficient and more controllable compared with traditional constant current or constant voltage control is obtained, and the precision and consistency of material treatment are improved.

The invention relates to the technical field of nitride layer preparation methods, and particularly discloses a mold surface hardness gradient distribution layer thickness adjustable nitride layer preparation method which comprises the following steps: surface nanocrystallization pretreatment: performing ultrasonic shot peening or surface mechanical grinding treatment on the surface of a mold; a nanocrystalline layer with the depth not smaller than 50 microns and the grain size smaller than 100 nm is formed on the surface of the mold; a nanocrystalline layer is constructed through surface nanocrystallization pretreatment, an efficient diffusion channel is provided for nitrogen atoms, precise regulation and control of multi-field coupling plasma nitriding are matched, excessive generation of a brittle white bright layer can be restrained, the smooth hardness gradient from a base body to a nitriding layer is achieved, and the surface hardness and the core toughness of the mold are both considered.

The invention relates to a method for preparing a super-thick compact infiltrated layer through interface reactivation type cyclic nitridation, and aims to solve the problems that an infiltrated layer obtained through existing salt bath nitridation treatment is insufficient in thickness and poor in performance. The method for preparing the super-thick compact infiltrated layer comprises the following steps: 1, putting a preheated workpiece in a nitriding furnace into a molten salt bath medium, and carrying out salt bath nitriding treatment at the temperature of 380-650 DEG C; 2, carrying out layer removal treatment through stress-assisted surface subtractive machining to remove a surface compound layer of the workpiece; thirdly, the salt bath nitriding treatment and the layer removing treatment are repeated for multiple times; and 4, carrying out surface ultrasonic rolling post-treatment on the workpiece subjected to circulating salt bath nitriding. According to the method, a compound layer formed in the nitriding process is removed, the nitrogen atom diffusion driving force of subsequent nitriding treatment is enhanced, the nitrided layer subjected to circulating salt bath nitriding treatment has higher nitrogen concentration, the thicker nitrided layer is prepared, the depth and compactness of the nitrided layer of the metal workpiece can be remarkably improved, and the comprehensive performance of the nitrided layer is enhanced.

The invention discloses a manufacturing process and equipment of a high-performance long-service-life cold working die. The process comprises the following steps: quenching and tempering a cold-work die steel blank to obtain a tempered martensite structure; plasma nitrocarburizing is carried out to form a reinforced diffusion layer; the micro-pit array is machined through pulse laser, and an annular heat-affected softening zone is formed around the opening of the pit; depositing a hard coating, and forming a cantilever structure on the edge of the micro pit; wherein plasma nitrocarburizing is carried out in a low-pressure plasma atmosphere, laser processing and coating deposition are carried out in a vacuum or protective atmosphere, and transfer among the steps is not exposed to the atmosphere. The invention further provides corresponding manufacturing equipment which comprises a heat treatment cavity, a plasma nitrocarburizing cavity, a surface micro-texture machining cavity, a coating deposition cavity and a vacuum transfer cavity. According to the invention, the hardness mutation between the coating and the matrix is relieved, a hardness gradient transition structure is constructed, the fatigue stripping resistance of the coating is obviously improved, and the service life of a mold is prolonged.

The invention relates to a regulation and control method for a nitridation permeable layer of a die-casting die. The regulation and control method comprises the following steps that the die-casting die is pretreated and partitioned; the pretreated mold is placed in nitriding equipment, nitrogen and hydrogen are introduced into the nitriding equipment, the volume ratio of the nitrogen to the hydrogen is (4-5): 1, and heat preservation is conducted after the temperature in the nitriding equipment is increased to a first temperature interval; the nitriding reaction rate in the nitriding equipment is monitored and calculated in real time, and according to the subareas of the die-casting die, a subarea heating program is started, and different areas of the die-casting die are subjected to subarea heating; adjusting the volume ratio of the nitrogen to the hydrogen to be 1: 1, maintaining the temperature of each zone set by the zone heating program, and maintaining the process parameters of the stage until the thickness and hardness of the nitride layer reach target values; and after the nitriding treatment is finished, the mold is cooled to the tapping temperature under the protective atmosphere. The hardness distribution uniformity, the thermal fatigue resistance, the wear resistance and the overall service life of the die-casting die can be improved.

The invention relates to the technical field of motor clamp springs, and particularly discloses a high-strength ultrathin titanium alloy for a motor clamp spring and a preparation method thereof.The preparation method comprises the steps that firstly, a titanium alloy cast ingot is subjected to hot forging machining, coarse and large crystal grains are crushed, then hot rolling is conducted, and in the hot rolling process, pulse current is adopted for assisting, and the high-strength ultrathin titanium alloy is obtained through the electroplastic effect; the method comprises the following steps: carrying out hot rolling to obtain a grain structure finer and more uniform than traditional hot rolling, then carrying out shot blasting treatment and carbonitriding treatment on the surface of a titanium alloy matrix to enhance the hardness, strength, wear resistance and fatigue resistance of the material, and finally, introducing a residual compressive stress field while eliminating surface defects and increasing surface compactness by adopting a heat-assisted ultrasonic rolling process, so as to improve the wear resistance of the material. The generation and expansion of fatigue microcracks are inhibited, and the anti-fatigue performance of the material is enhanced.

The utility model discloses a large zinc impregnation furnace. The large zinc impregnation furnace comprises a control box, a rotating mechanism, an opening and closing driving mechanism, a cylindrical shell and two zinc impregnation bins, according to the large zinc impregnation furnace, the two zinc impregnation bins are utilized, so that the zinc impregnation furnace can contain a large number of workpieces at the same time; the rotating mechanism is used for driving the sherardizing bins to rotate, the two heating shells contain the two sherardizing bins, the two sherardizing bins are heated through the heating unit, and heating sherardizing of workpieces can be achieved; the two heating shells are driven by the opening and closing driving mechanism to be close to each other and closed, so that the zinc impregnation bin is located in the cylindrical shell, and heat loss is reduced.

The invention discloses a double-ceramic-layer thermal barrier coating of a differentiated columnar crystal structure and a preparation method, and belongs to the technical field of thermal barrier coating corrosion and protection. The invention innovatively discovers and utilizes the double influence of the columnar crystal size on the performance of the coating; the YSZ layer adopts a fine grain structure of 1-1.5 microns, so that the bonding strength and thermal shock resistance of the coating can be obviously improved; and the modified gadolinium zirconate layer adopts a 2-3 [mu] m coarse grain structure, so that the heat conductivity can be reduced, the permeation path of CMAS along a grain boundary can be effectively inhibited, and meanwhile, the modified gadolinium zirconate layer reacts with CMAS to form a compact barrier layer to prevent further permeation of CMAS. Through accurate regulation and control of electron beam physical vapor deposition (EB-PVD) process parameters, differential control of the sizes of the two layers of ceramic columnar crystals is realized, and under the synergistic effect of the two columnar crystal structures with different sizes, the thermal cycle life and CMAS corrosion resistance of the whole coating system in an ultra-high-temperature environment are remarkably prolonged and improved.

The invention discloses preparation and application of a nickel selenide / ferronickel phosphate crystal / amorphous heterogeneous catalyst, and relates to the technical field of electrochemistry. Selenizing the foamed nickel at low temperature in an inert atmosphere to generate a crystalline NiSex layer in situ; and by taking the obtained electrode as a working electrode, carrying out electrodeposition in a deposition solution containing nickel salt, ferric salt, hypophosphite and acetate by adopting a cyclic voltammetry method, so that amorphous NiFePOy is deposited on the surface of NiSex, and a NiSex / NiFePOy crystal / amorphous heterostructure nanosheet layer is constructed and is used for an alkaline medium urea oxidation reaction. The invention has the following beneficial effects: crystalline / amorphous interface coupling and a nanosheet self-supporting structure synergistically improve active sites and charge transfer capability, reduce energy consumption and improve current output; meanwhile, the electrode stability and durability are enhanced; the method has the advantages of low material cost, mild and simple process, suitableness for amplified preparation, and application potential of urea-assisted water electrolysis energy-saving hydrogen production.

The application relates to a high-temperature nitriding preparation method of a cobalt-based high-temperature alloy by using nitride dispersion reinforcement, and belongs to the technical field of dispersion reinforcement materials. The cobalt-based high-temperature alloy profile is placed in a high-temperature nitriding furnace, the inner cavity of the nitriding furnace is vacuumized, the cobalt-based high-temperature alloy profile is in a vacuum environment, then argon is filled into the inner cavity of the nitriding furnace, and the temperature is raised to a set temperature of 1100-1200 DEG C; then a mixed gas atmosphere of nitrogen and argon is introduced into the inner cavity of the nitriding furnace, the flow speed is 80-120 mL / min, the cobalt-based high-temperature alloy profile is subjected to nitriding treatment in the furnace for a certain time, and after the high-temperature nitriding process is completed, the temperature is cooled to room temperature at a cooling rate of 20-40 DEG C / min. The method is aimed at cobalt-based high-temperature alloy wire or plate, high-temperature nitriding treatment is carried out in a mixed gas atmosphere of nitrogen and argon, stable nitrides are formed in the alloy organization to play a dispersion reinforcement role, and the problem that the strength of the cobalt-based high-temperature alloy is relatively low can be effectively solved.

A molybdenum silicide layer is formed on a bottom surface in a recessed feature in a silicon or silicon-germanium substrate. The bottom surface may be a silicon or silicon-germanium. A first molybdenum lay er may be deposited on or over the molybdenum silicide layer to fill the recessed feature. In some cases, a second molybdenum layer may be formed on the molybdenum silicide layer. In some cases, the second molybdenum layer may be exposed to nitrogen radicals or nitrogen-containing radicals, forming a molybdenum nitride layer on the second molybdenum layer.

The invention discloses a low-temperature-impact-resistant high-strength bolt for a high-cold railway and a heat treatment method of the low-temperature-impact-resistant high-strength bolt. The bolt is of a special three-layer structure of a base body, a bionic nanometer laminated layer and a high-entropy alloy nitriding layer, wherein the grain size of the base body reaches the ASTM8 level or above; the bionic nano laminated layer is formed by alternately depositing TiN and VC, and the thickness of a single layer is less than 50nm; the high-entropy alloy nitriding layer is made of AlCoCrFeNiTi, the thickness is larger than 50 microns, the heat treatment method comprises the steps of grain refinement pretreatment, lamination preparation through magnetron sputtering, high-entropy alloy laser cladding, electromagnetic field assisted nitriding, oil quenching, cryogenic oscillation, tempering and the like, and intelligent quality control means such as a machine learning model, sound pressure feedback and image recognition are integrated. According to the scheme, the impact energy of the bolt at the temperature of minus 60 DEG C is higher than 55 J, the tensile strength is larger than 1200 MPa, the surface hardness is not lower than 1200 HV, the interface bonding critical load is higher than 80 N, and the problems of low-temperature brittle fracture, obdurability contradiction and quality consistency of the high and cold bolt are solved.

The invention relates to the technical field of battery monomers, in particular to a preparation method of a battery metal shell with a gradient structure heat insulation coating and a battery monomer. Comprising the following steps: S1, pretreating a battery metal shell, and carrying out physical vapor deposition on the outer surface of the battery metal shell to obtain a coated battery metal shell; the coating film is a Ti coating film or a TiZr coating film; s2, carrying out surface nitriding treatment on the coated battery metal shell, and at least obtaining a nitriding layer on the surface of the coated film, so as to obtain the battery metal shell with a gradient structure heat insulation coating; the heat insulation coating structurally comprises a metal diffusion bonding layer and a nitriding layer from inside to outside in sequence, and the metal diffusion bonding layer is at least one intermetallic compound layer; the heat insulation coating with the gradient structure is prepared on the battery metal shell, so that the problems of low surface hardness, poor mechanical stability and poor heat insulation performance of an existing battery monomer aluminum alloy shell are solved.

The application discloses a metal surface heat treatment device with a self-diagnosis function and a treatment method, relates to the technical field of metal heat treatment devices, and comprises a main base, the upper surface of the main base is provided with a cooling soaking pool, and the upper surface of the main base is further provided with an auxiliary mechanism; the auxiliary mechanism comprises a material conveying component and a gas collecting assembly; the material conveying component comprises a conveying frame body arranged on the upper surface of the cooling soaking pool and provided with a feeding conveyor belt on the upper surface; the gas collecting assembly is composed of a detection component and a processing component; the gas collecting assembly comprises a side base connected with one side surface of the main base, and the upper surface of the side base is provided with a treatment box body; and the processing component comprises a regenerative catalytic oxidizer and a receiving pool. In the scheme, the gas collecting assembly can intelligently collect organic mist generated during metal quenching, and the organic mist is treated through condensation or catalytic decomposition; in addition, the treatment product can be reused to improve the performance of the cooling liquid.