1400 results about "Nitriding" patented technology

The invention discloses a high-strength and high-toughness aluminum nitride ceramic and a preparation method thereof, and relates to the technical field of ceramics, a sol-gel method is adopted to coat the surface of aluminum nitride with a stable shell layer to form a core-shell structure, meanwhile, the low lattice mismatch rate of a core-shell interface is utilized to reduce thermal resistance, and toughness and thermal conductivity are both considered; according to the external magnetic field tape casting method, the magnetic dipole moment orientation principle is utilized, an external magnetic field is applied in the tape casting stage, the in-plane mechanical property is improved, and the fracture toughness is improved through the magnetism of aluminum nitride whiskers; a reinforcement is introduced to improve the mechanical property and corrosion resistance of the aluminum nitride ceramic material, multi-granularity powder is compounded, large-particle aluminum nitride powder is used as a sintering and heat-conducting framework material, and high activity provided by submicron particles is utilized to promote sintering, so that the sintering temperature of aluminum nitride can be remarkably reduced, and the performance is greatly improved; and the aluminum nitride substrate expands more application fields on a future packaging circuit.

The invention provides a low-cost metal modified electrode material, a preparation method and application, solves the problems that a carbon nitride material is difficult to recover and poor in sustainability, and improves the photoelectrocatalysis capability of an active carbon material. Further constructing a packed bed cathode coupled microbial fuel cell system; the treated industrial wastewater is high-salt coking wastewater from Anshan steel, a PEC-MFC system filled with electrogenesis microorganisms is used for realizing wastewater recycling and harmlessness, and energy-saving, high-efficiency and one-step treatment of the industrial wastewater is completed.

The invention relates to the technical field of aluminum nitride powder preparation, and particularly discloses an aluminum nitride powder preparation device and a preparation process thereof.The aluminum nitride powder preparation device comprises a bottom plate, two mounting frames are fixedly mounted on the top face of the bottom plate, and a rotating frame is rotatably mounted between the two mounting frames through a rotating shaft; mounting shafts are rotationally mounted on the two opposite inner walls in the rotating frame, and the ends, close to each other, of the two mounting shafts are jointly and fixedly connected with a rotating ring which is obliquely arranged. The grinding barrel is driven by the switching assembly to adjust inclination around the axis center of the grinding barrel, so that raw material powder can be sequentially subjected to step-by-step ball milling in the two grinding cavities, the particle size of the raw material powder is rapidly reduced under the action of a large grinding medium, the total ball milling time is shortened, and the cold welding phenomenon is reduced; and the raw material powder is subjected to high-precision ball milling through a small grinding medium, so that the raw material powder is further refined, the influence of cold welding on the ball milling quality is reduced, and the agglomeration phenomenon is reduced.

The invention belongs to the field of metal materials, and provides a hard alloy wear-resistant steel ball suitable for mine ore grinding and a preparation method thereof.The hard alloy wear-resistant steel ball is prepared from waste steel pig iron as a basic raw material and chemical components including 2.1%-2.2% of C, 9.8%-10.0% of Cr, 0.10%-0.20% of V and 0.03%-0.06% of Ti; a core-shell precipitated phase microstructure design with MN / MCN as a hard core and chromium carbonitride as a gradient self-passivation shell layer is formed through medium-frequency induction furnace smelting, controlled nitrogen introduction establishment of a V-Ti-C-N microalloy system, bottom pouring solidification and austenitizing quenching and tempering heat treatment processes, and the performance indexes that the surface hardness is HRC60-63 and the core hardness is HRC54-58 are achieved; the average particle size of a core-shell precipitated phase is in dispersed distribution of 20-200nm, the shell thickness is 5-50nm, and the alloy steel ball has excellent wear resistance and corrosion resistance under the high-impact and high-wear working conditions of wet ore grinding, solves the problem of insufficient wear resistance and corrosion resistance of a traditional alloy steel ball, and has wide mine ore grinding application value.

The invention relates to a high-nitrogen steel preparation method capable of efficiently and accurately increasing nitrogen through pressurized gas phase nitriding and bottom blowing nitrogen, which comprises the following steps: filling a furnace chamber of a pressurized induction furnace with first target nitrogen pressure, and entering a molten steel surface gas phase nitrogen increasing stage; and then pressurizing and bottom blowing nitrogen, controlling the pressure of the bottom blowing nitrogen by adjusting the output pressure of a nitrogen cylinder, controlling the bottom blowing flow, and entering a pressurized gas phase nitriding and bottom blowing nitrogen increasing stage. And then pressurizing bottom nitrogen blowing is stopped, second target nitrogen pressure needed by casting continues to be filled into the furnace cavity of the pressurizing induction furnace, and the molten steel surface gas phase nitrogen increasing stage under the casting nitrogen pressure enters. By combining the bottom blowing nitrogen, the nitrogen increasing efficiency is improved, the preparation period is greatly shortened, and therefore the production efficiency of the high-nitrogen steel is improved. Besides, the nitrogen pressure, the bottom blowing flow and the nitrogen increasing amount are accurately controlled in stages, dynamic prediction is carried out in combination with a calculation formula, accurate control over the liquid nitrogen content of the steel is achieved, and the requirements of different high-nitrogen steel products are met.

The present invention belongs to the technical field of metal materials and their processing, and discloses a treatment method for double glow plasma nitriding on the inner wall surface of a titanium alloy round tube, and obtains a TC4 round tube with a nitriding layer on the inner wall, which significantly improves the hardness and wear resistance of the inner wall of the TC4 titanium alloy round tube, prolongs the service life of the parts, and meets the urgent needs of modern industry for high wear-resistant parts. After cleaning, drying, vacuuming, double glow plasma nitriding, furnace cooling, and precise control of parameters such as heating rate, gas ratio and nitriding time, the thickness and performance of the nitriding layer are precisely controlled, ensuring the stability and repeatability of the treatment effect. The obtained TC4 round tube sample was tested, and the metallographic structure of the nitriding layer on the inner wall was closely combined with the matrix, with a small risk of falling off and a relatively thick layer thickness of up to 17±1µm, and an average hardness of up to 713.04HV, which can reach 2.2 times the hardness of the matrix.

The invention provides nickel-based superalloy powder and a preparation method and application thereof, nickel-based superalloy and a preparation method and application thereof, and relates to the technical field of alloys. The preparation method comprises the following steps: smelting a nickel-based high-temperature alloy raw material to obtain alloy liquid; and the alloy liquid is atomized and crushed, and the nickel-based high-temperature alloy powder is obtained. Compared with traditional nickel-based superalloy preparation, aluminum nitride and titanium nitride raw materials are added in the nickel-based superalloy powder preparation process, aluminum nitride and titanium nitride are separated out in the alloy powder preparation process to form a strengthening phase, and the tensile strength and the elongation at break of the nickel-based superalloy can be improved; and particularly, as a main raw material for additive manufacturing of high-performance metal components, the material has a very good application prospect.

The invention relates to the technical field of stainless steel pneumatic cylinder barrels, and particularly discloses a wear-resistant stainless steel pipe for a pneumatic cylinder barrel and a preparation process thereof.The wear-resistant stainless steel pipe for the pneumatic cylinder barrel comprises the steps that firstly, a powder metallurgy method is adopted, tungsten carbide, cerium oxide, chromium nitride and other components are added into stainless steel powder, and the performance of a steel pipe base body is enhanced; the corrosion-resistant alloy layer is deposited on the surface of the steel pipe, so that the corrosion resistance, wear resistance and other properties of the steel pipe are enhanced, finally, a silicon nitride wear-resistant ceramic layer is sintered on the surface of the corrosion-resistant coating, and two lubricants of graphite and molybdenum sulfide are synthesized in gaps and holes of the wear-resistant ceramic layer. The defects on the ceramic surface are blocked; and the ceramic coating is endowed with a self-lubricating function.

The invention relates to the field of nitriding furnaces, in particular to an ammonia gas circulating system of a nitriding furnace, which comprises a furnace body, a furnace cover and a gas inlet mechanism, the furnace body is provided with a containing cavity, the furnace cover is connected to the furnace body and covers a cavity opening of the containing cavity, and the gas inlet mechanism comprises a gas inlet main pipe, an annular pipeline, an electromagnetic valve and a detection assembly, one end of the gas inlet main pipe is connected to the outer wall of the annular pipeline, the other end of the gas inlet main pipe is used for being connected with an external ammonia gas storage mechanism, the electromagnetic valves are connected to the annular pipeline, the other ends of the electromagnetic valves extend into the furnace body, the electromagnetic valves are circumferentially distributed around the axis of the annular pipeline at intervals, and the detection assembly is embedded in the containing cavity to control the electromagnetic valves to be opened and closed. External ammonia gas is conveyed to the annular pipeline through the gas inlet main pipe, then the ammonia gas is input into the furnace body through the multiple electromagnetic valves distributed around the axis of the annular pipeline in the circumferential direction at intervals, meanwhile, the detection assembly controls the electromagnetic valves to be opened and closed through the pressure intensity in the containing cavity, the ammonia gas introduced into the nitriding furnace is evenly distributed to all positions in the nitriding furnace, and the uniform nitriding effect is improved.

The invention discloses an electric engine assembly integral forming process based on precision integral casting, which comprises the following steps: designing a split type precision mold through computer aided design software, and carrying out nitriding treatment to improve the performance; selecting a specific aluminum alloy raw material, performing vacuum induction melting and refining, and injecting the aluminum alloy raw material into a preheated and sprayed mold cavity in a low-pressure casting manner; and demolding after air cooling and water cooling are combined, then after-treatment procedures such as deburring and heat treatment are conducted, and finally detection and assembly are conducted. A conformal cooling water channel design and an ultrasonic-assisted smelting technology are adopted in the process innovation, and the casting process is monitored in real time. According to the process, manufacturing procedures are reduced, compared with a traditional mode, the production efficiency is improved by 30%-50%, the cost is reduced by 20%-30%, the assembling problem is effectively avoided, the sealing performance and reliability of the electric engine are improved, the service life of the electric engine is prolonged, high integration is achieved, and the modern industrial requirement is met.

The invention provides a welding method of an aluminum nitride ceramic heating plate, which comprises the following steps of: firstly, accurately grinding and cleaning a welding surface of an aluminum nitride sleeve and a welding surface of an aluminum nitride plate body, and then printing and coating a welding layer material Y2O3-CaCO3-SiO2-MgO on the welding surface of the aluminum nitride sleeve and the welding surface of the aluminum nitride plate body; and finally sintering to obtain the aluminum nitride ceramic heating plate with good sealing performance, high welding strength and high heat conductivity, and the aluminum nitride ceramic heating plate is suitable for large-scale popularization and application.

The invention discloses a preparation method of a laser-assisted titanium alloy ion nitriding wear-resistant coating. The method comprises the following steps: 1, treating a titanium alloy workpiece; secondly, the treated titanium alloy workpiece is subjected to ion nitriding, and a nitriding layer with a hard shell layer structure is formed; 3, performing laser remelting on the infiltrated layer to destroy a hard shell layer structure; and fourthly, the titanium alloy workpiece subjected to laser remelting is subjected to ion nitriding diffusion permeation, and the wear-resistant coating is formed. The wear-resistant coating is prepared on the surface of the titanium alloy workpiece through the laser-assisted ion nitriding method, the hard shell layer structure on the surface of the nitriding layer is eliminated through laser remelting, the thickness and quality of the wear-resistant coating are improved, phase change and workpiece deformation are avoided, and the preparation process is simple, high in reliability and suitable for application and popularization.

The present invention provides a steel sheet having high strength and high ductility, and a method for manufacturing the same.　The steel sheet has a specific component composition and a structure mainly composed of ferrite. The amount of N present as AlN and the total amount of N satisfy relational expression (1), and the amount of Nb present as Nb precipitates and the total amount of Nb satisfy relational expression (2). The yield strength is 500 MPa or greater, the HR30T hardness is 66 or greater, and the total elongation is 7.0% or more. (1): (Amount of N present as AlN) / (total amount of N) ≤ 0.40 The total amount of N is the amount of all N included in the steel sheet. (2): 0.10 ≤ (amount of Nb present as Nb precipitates) / (total amount of Nb) ≤ 0.80 The total amount of Nb is the amount of all Nb included in the steel sheet.

A packaging process of a temperature sensor chip comprises the following steps: selecting an aluminum nitride ceramic substrate, and selecting a gold-tin solder sheet with a corresponding size according to the size of the chip; cleaning the aluminum nitride ceramic substrate; manufacturing a double-sided metallization layer of the aluminum nitride ceramic substrate; cutting up the aluminum nitride ceramic substrate on which the metallization layer is deposited according to the size of the chip, then placing a metal tube shell on a sintering mold, placing a gold-tin solder piece on the metal tube shell, placing the cut aluminum nitride ceramic substrate on the gold-tin solder piece, placing the gold-tin solder piece on the aluminum nitride ceramic substrate again, and then placing the gold-tin solder piece on the aluminum nitride ceramic substrate again; and finally placing a chip. Putting the raw materials into an eutectic welding furnace for sintering; and a programmable vacuum eutectic welding furnace is selected for eutectic sintering, after welding is completed, after the temperature is reduced to 70 DEG C or below, a cavity door is opened, and the device is taken out. The beneficial effects are that the temperature sensing performance is high, the insulation effect is good, the technology is reasonable, the operation is simple, the production efficiency is high, and the method is suitable for industrial production.

The invention provides a ceramic heating plate and a processing method of the ceramic heating plate. The machining method of the ceramic heating plate comprises the steps that the ceramic heating plate formed through normal-temperature isostatic pressing is prepared, the upper surface of the ceramic heating plate is made of aluminum nitride, at least an electrostatic adsorption metal wire mesh electrode is embedded in the ceramic heating plate, the process temperature of normal-temperature isostatic pressing forming is lower than 25 DEG C, and the process air pressure of normal-temperature isostatic pressing forming is lower than 200 Mpa; the process temperature of the high-temperature and high-pressure sintering is higher than 1500 DEG C, the process air pressure of the high-temperature and high-pressure sintering is higher than 100 Mpa, and the high-temperature and high-pressure sintering is used for avoiding the use of a binder or a ceramic layer spraying process, so that the heating temperature is increased, the sparking phenomenon of an equipment corrosive agent under high electrostatic adsorption voltage is avoided, and the service life of the equipment corrosive agent is prolonged. The service life of equipment is prolonged; and the safety performance of the process is improved.

The invention discloses a preparation method of angular aluminum nitride large-particle powder, which comprises the following steps: weighing raw material aluminum powder, aluminum nitride powder and a sintering aid according to a ratio, uniformly mixing, carrying out compression molding, carrying out combustion synthesis on a raw material blank in a high-pressure nitrogen atmosphere to obtain aluminum nitride ceramic, and crushing and screening to obtain the angular aluminum nitride large-particle powder of 20-200 mu m. According to the invention, one-step synthesis and sintering of aluminum nitride are realized by utilizing combustion reaction heat release of aluminum powder and nitrogen, the method has the characteristics of simple process and low preparation cost, and the prepared angular aluminum nitride large-particle powder can be used as a high-thermal-conductivity filler for electronic packaging.

The invention provides an ultra-low carbon duplex stainless steel all-position welding flux-cored wire and a welding method thereof.The outer skin of the flux-cored wire is a stainless steel strip, the flux-cored wire is filled with powder, and the powder comprises, by mass, 18-25% of natural rutile, 20-30% of stainless steel powder, 20-30% of stainless steel powder, 20-30% of stainless steel powder and the balance stainless steel powder. 3-5% of sodium titanate; 5-10% of quartz sand; 0.5 to 4 percent of zircon sand; 1-3% of sodium fluoride; 15 to 25 percent of ferromolybdenum; 3-6% of nitrided ferrochrome; 2-4% of electrolytic manganese; 5-8% of nickel powder; 27 to 32 percent of metal chromium; 0.5-2% of magnesium powder; 0.5 to 1.5 percent of bismuth oxide; and 1-4% of silicon iron. The flux-cored wire is used for all-position welding of third-generation duplex stainless steel, welding spatter is small, and weld joint forming is good; the carbon content of a weld joint is extremely low, and through component and welding process control, weld joint metal has strength, plasticity, toughness and corrosion resistance equivalent to those of base metal. And the double requirements of high strength and toughness and high corrosion resistance in the manufacturing fields of submarine pipeline laying, shipbuilding, marine gas field exploitation and the like are ensured.

The invention provides a nano composite tungsten-based alloy. The alloy comprises the following components in parts by weight: 84.0 to 87.0 parts of W powder, 7.0 to 9.0 parts of N powder, 3.0 to 5.0 parts of Fe powder, 0.2 to 0.5 part of Co powder, 1.5 to 2.5 parts of Mo powder, 0.8 to 1.0 part of Zr powder, 0.5 to 0.8 part of Cr powder, 0.3 to 0.5 part of Mn powder, 0.4 to 0.5 part of B powder, 0.2 to 0.4 part of Ta powder, 0.1 to 0.3 part of Hf powder, 0.1 to 0.2 part of V powder, 0.1 to 0.3 part of T powder, 0.1 to 0.2 part of silicon carbide powder, 0.1 to 0.2 part of aluminum nitride powder, 0.3 to 0.5 part of yttrium oxide powder and 0.1 to 0.2 part of lanthanum oxide powder. The yield strength of the nano-composite tungsten-based alloy can reach 1270-1520 MPa, the tensile strength of the nano-composite tungsten-based alloy is 1430-1680 MPa, the ductility of the nano-composite tungsten-based alloy is 6-12%, and the impact toughness of the nano-composite tungsten-based alloy is 130-220 J / cm < 2 >.

The invention relates to the technical field of polishing, and particularly discloses a gallium nitride polishing method. The gallium nitride polishing method provided by the invention comprises the following steps: sequentially carrying out first-time polishing treatment and second-time polishing treatment on gallium nitride by using a first polishing solution, a first polishing pad, a second polishing solution and a second polishing pad to obtain polished gallium nitride. According to the method, the GaN surface is polished twice, the grinding material of the polishing solution and the type hardness trend of the polishing pad during the first polishing and the second polishing are limited, on the premise that the polishing rate is increased and the roughness of the GaN surface is reduced, the problem that micro cracks and internal cracks appear on the GaN surface after the GaN surface is treated through an existing polishing process is solved, and the quality of the GaN surface is improved. And the surface quality and the product percent of pass of GaN are greatly improved.

The invention discloses a smelting method of a green invar alloy. The smelting method specifically comprises the following steps: adopting an electric arc furnace smelting, LF (ladle furnace) refining and VD (vacuum degassing) oxygen control and nitrogen increase triple smelting process; in the electric arc furnace smelting process, directly reducing iron within 30% is added, and the remaining proportion is scrap steel; in the LF refining process, precious metals such as a nickel plate, ferromolybdenum and ferrovanadium are added for alloying operation; and a gaseous nitrogen increasing process is adopted in the VD smelting process. According to the method, direct reduction iron and waste steel are adopted as raw materials of the electric arc furnace, the carbon emission in the smelting process is greatly reduced, the requirement for environmental protection is met, the gaseous nitrogen increasing technology is adopted in the VD process, precious nitroalloy raw materials do not need to be used, the smelting cost is reduced, energy consumption is reduced, and the steel grade is rich in'green steel 'labels.

The invention discloses an IrRu / TiOxNy nanobelt composite catalyst and a preparation method thereof, and the preparation method comprises the following steps: loading an IrRu alloy on a titanium-containing nanobelt carrier by using an ethylene glycol reduction method, placing the titanium-containing nanobelt carrier in the middle of a tubular furnace, vacuumizing, introducing NH3, heating to 500-600 DEG C under flowing NH3, preserving heat for 1-5 hours, and cooling to room temperature to prepare the IrRu / TiOxNy nanobelt composite catalyst, wherein the loading capacity of the IrRu alloy is 10 to 30 weight percent. The IrRu / TiOxNy nanobelt composite catalyst disclosed by the invention not only can realize low-loading-capacity IrRu alloy (the loading capacity is only 10-30wt%), but also still has excellent catalytic activity and stability, and the nitridation temperature of the carrier can be remarkably reduced.

The invention provides a high-wear-resistance and low-dilution gas shielded welding wire and a preparation method thereof, and belongs to the technical field of welding wire manufacturing. The welding wire consists of the following raw materials in parts by weight: 45-52 parts of iron; 18-22 parts by weight of an electrolytic nickel plate; 6-8 parts by weight of high-purity molybdenum powder; 4-6 parts by weight of nano tungsten powder; 3-4.5 parts by weight of a vanadium nitride alloy; 1.2 to 1.8 parts by weight of a niobium-iron alloy; 0.8-1.5 parts by weight of aluminum magnesium alloy powder; 0.3 to 0.6 part by weight of lanthanum cerium mixed rare earth; 0.15 to 0.25 part by weight of ferroboron alloy; 0.5 to 0.8 part by weight of metal silicon powder; 0.2 to 0.4 part by weight of a magnesium-calcium alloy; and 0.1-0.3 part by weight of titanium hydride powder. The hard framework is formed through gradient distribution of carbides such as molybdenum, tungsten and vanadium, the wear-resisting life is remarkably prolonged, melting mixing of base metal is reduced through the nickel-based alloy, the consistency of deposited metal components is ensured, free hydrogen is fixed through hydrogen trap phases such as titanium and niobium, and a moisture absorption path is blocked in combination with a surface passivation film.

The invention discloses a high-strength stainless steel seamless steel pipe and a machining process thereof, and relates to the technical field of alloy treatment. The processing technology of the high-strength stainless steel seamless steel tube comprises the following steps: step 1, pretreating the stainless steel seamless steel tube to obtain a pretreated stainless steel seamless steel tube; 2, an ion nitriding process is adopted for conducting synchronous nitriding treatment on the inner pipe and the outer pipe of the pretreated stainless steel seamless steel pipe, and the nitrided stainless steel seamless steel pipe is obtained; and 3, the plasma spraying technology is adopted, the surfaces of the inner pipe and the outer pipe of the nitrided stainless steel seamless steel pipe are each coated with a compression-resistant protective layer, and the high-strength stainless steel seamless steel pipe is obtained through microwave treatment. Pretreatment, plasma nitriding treatment and plasma spraying treatment are sequentially conducted on the inner pipe and the outer pipe of the stainless steel seamless steel pipe with the specific component proportion, the compressive strength, the fatigue resistance and other performance of the inner pipe and the outer pipe of the stainless steel seamless steel pipe are synergistically enhanced, and the quality of the stainless steel seamless steel pipe is improved.

The invention discloses a high-performance ultrathin rare earth permanent magnet sheet and a preparation method thereof, and belongs to the technical field of rare earth permanent magnet material preparation. The preparation method comprises the following steps: melting an iron raw material and a part of a samarium raw material under a vacuum condition, then adding the balance of samarium, continuously melting, and pouring the obtained molten alloy onto a cooling roller to obtain a samarium-iron alloy sheet; the samarium-iron alloy sheet is sequentially subjected to homogenization treatment, hydrotreating and nitriding treatment, and nitrided magnetic powder is obtained; adding phosphoric acid and a corrosion inhibitor into the magnetic powder, carrying out wet ball milling, and drying to obtain surface-treated magnetic powder; adding a binder into the surface-treated magnetic powder, and banburying to obtain magnetic particles; the magnetic particles are pressed by a press vulcanizer, the thickness of the prepared rare earth permanent magnetic sheet is only 0.2 mm-0. 4mm, and the magnetic sheet is high in corrosion resistance, sufficient in surface magnetism, high in magnetic performance, low in preparation cost and capable of meeting application requirements of specific scenes.

The utility model relates to the technical field of aluminum nitride sintering frames, in particular to a sintering frame capable of being heated uniformly. The sintering frame capable of achieving uniform heating aims at solving the technical problems that in the prior art, heating is prone to being uneven, and the number of nitriding furnaces for single-time sintering is small. According to the technical scheme, the sintering frame capable of being heated uniformly comprises a bottom plate; the device further comprises a lifting control assembly, a side plate, a transmission shaft, a conveying belt, a guide sliding assembly, an adjustable supporting assembly, a rotary hanging frame assembly, a locking plate, a locking bolt and a sliding wheel. According to the aluminum nitride sintering furnace, a rotatable runway type structure is adopted as a whole, and the multiple sets of hanging frames distributed at equal intervals are arranged on the outer side of the conveying device, so that more aluminum nitride can be sintered at a time, the utilization rate of the space in the sintering furnace is greatly improved, and the sintering efficiency of the aluminum nitride is improved; the distance is adjusted according to the specification of aluminum nitride, the device is suitable for aluminum nitride of different specifications, and it is ensured that aluminum nitride can be evenly heated.

A compressor of an embodiment includes a compression mechanism part that compresses a refrigerant in a sealed container. The compression mechanism part includes Cr and includes a first member and a second member which slidingly move relative to each other. The first member has a chromium layer and a nitride layer formed on a base member surface in this order. The nitride layer includes CrN and TiN. Carbide is deposited on a surface of the second member.

The present invention discloses a preparation method of a graphite-like carbon nitride-yttrium-stabilized zirconium oxide composite hydrogen barrier coating. First, a low-carbon steel substrate is pretreated to obtain a pretreated substrate; then zirconium n-propyl alcohol, n-propyl alcohol, acetylacetone and yttrium nitrate are mixed and reacted, aged to obtain a yttrium-stabilized zirconium oxide sol; the sol is coated on the pretreated substrate and dried, and the coating, drying and repeated treatments are followed by pre-sintering, followed by repeated coating, drying, and finally heat treatment to obtain a yttrium-stabilized zirconium oxide coating YSZ; melamine and thiourea are mixed, calcined and ground to obtain powdered graphite-like carbon nitride g-C3N4; finally, g-C3N4 powder and a coating coated with YSZ are sintered to obtain a graphite-like carbon nitride-yttrium-stabilized zirconium oxide g-C3N4 / YSZ composite coating. The hydrogen barrier coating prepared by the present invention can solve the problem that hydrogen embrittlement is prone to occur when current steel equipment is used in a hydrogen environment, and improve the safety of steel equipment during hydrogen energy utilization.

To provide an Fe-Ni-Cr alloy that can suppress intergranular cracking (nitriding resistance) and also inhibit the formation of red scale (oxidation resistance) even in a gas atmosphere containing nitrogen and water vapor, such as ammonia combustion gas, at a medium-high temperature range of 500 to 700°C.SOLUTION: The present invention relates to an Fe-Ni-Cr alloy that has a predetermined component composition, a nitriding resistance index of 81 or higher, and 3.0 or more of fine crystalline grains with a grain size of 0.5 μm or less present in the plate thickness direction in the alloy surface layer. The Fe-Ni-Cr alloy is obtained by introducing strain (transformation) on the surface of the alloy material by polishing or the like, then performing heat treatment, and generating fine crystalline grains using the introduced strain (transformation) as a driving force. Nitriding resistance index: Cr+3Ni-10Mo≥81.SELECTED DRAWING: None

The invention discloses an anti-pollution flashover and anti-impact tempered glass insulator and a processing technology thereof.The processing technology comprises the steps that silicon dioxide, sodium carbonate, calcium oxide, magnesium oxide, cerium dioxide, niobium trioxide, scandium trioxide, tungsten carbide and nano boron nitride are evenly mixed according to the formula ratio and fused, and fused liquid is obtained; then slowly injecting the molten liquid into a mold preheated in advance in a nitrogen environment, molding, and demolding to obtain a blank; carrying out primary nitriding treatment, pulsed magnetic field treatment, toughening treatment, heat treatment and secondary nitriding treatment to obtain a toughened glass part; and finally, binding the iron cap, the toughened glass piece and the steel foot into a whole by using an adhesive to obtain the toughened glass insulator. The toughened glass insulator has excellent anti-pollution flashover and anti-impact performance.

The invention discloses high-toughness and high-thermal-conductivity aluminum nitride ceramic and a production process, and relates to the related field of aluminum nitride ceramic. Hexagonal boron nitride and Ti3SiC2 composite particles with the surfaces coated with titanium nitride are introduced into aluminum nitride ceramic, a cerium oxide sintering aid and a reasonable organic adding system are supplemented, synergistic improvement of thermal conductivity and toughness is achieved, Ti3SiC2 is subjected to TiN nanometer coating, interface stability and oxidation resistance are enhanced, combination of Ti3SiC2 and a matrix is improved, and the thermal conductivity and toughness of the aluminum nitride ceramic are improved. The fracture toughness and the mechanical strength of the ceramic are obviously improved; meanwhile, aluminum nitride and hexagonal boron nitride construct an efficient thermal conductivity network, so that the material keeps excellent thermal conductivity, the overall scheme is reasonable in structural design and scientific in component matching, and the obtained ceramic is high in density, high in thermal conductivity, excellent in mechanical property and high in thermal shock resistance.