808 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 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 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 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.

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

An aluminum nitride ceramic welding assembly comprises a first aluminum nitride ceramic piece, a second aluminum nitride ceramic piece and a third aluminum nitride ceramic piece, a second pin hole corresponding to the first pin hole is formed in the welding surface of the second aluminum nitride ceramic piece; two ends of the aluminum nitride ceramic positioning pin are respectively inserted into the first pin hole and the second pin hole; and the slurry layer containing rare earth oxide is arranged on the welding surface of the first aluminum nitride ceramic piece, and the distribution density of the rare earth oxide is gradually reduced from the position close to the first aluminum nitride ceramic piece to the position far away from the first aluminum nitride ceramic piece. High-temperature displacement errors are eliminated by means of cooperative positioning of pin holes in the first aluminum nitride ceramic piece and the second aluminum nitride ceramic piece and aluminum nitride ceramic positioning pins; and meanwhile, generation of brittle phases is inhibited by utilizing a form that the distribution density of rare earth oxides in the slurry layer is gradually reduced from near to far, so that the effects of a high-precision welding interface and joint strength enhancement are obtained, and the reliability and the service life of the aluminum nitride ceramic component are improved.

The invention discloses a preparation method of a high-hydrophobicity liquid lead bismuth alloy nitride coating capable of increasing a high-temperature contact angle, which comprises the following steps of: pretreating a substrate, depositing a FeCrAl coating on the surface of the substrate by adopting magnetron sputtering, and nitriding the FeCrAl coating to obtain a nitride coating; the invention further discloses the high-hydrophobicity liquid lead bismuth alloy nitride coating for improving the high-temperature contact angle. According to the preparation method, the FeCrAl coating is nitrided, so that the surface strength and corrosion resistance of the FeCrAl coating are improved, the formed FeCrAl nitride layer with a compact structure has high lyophobicity on the liquid lead bismuth alloy, the material surface is in a non-wetting state all the time, the liquid lead bismuth alloy can be effectively prevented from permeating into an alloy matrix, and the service life of the material is prolonged. The material is suitable for being used as a cladding material of a lead-cooled fast neutron reactor.

A preparation method for high-nitrogen austenitic stainless steel. The high-nitrogen austenitic stainless steel comprises the following chemical components in percentages by weight: carbon: ≤0.02%; silicon: 0.4-0.8%; manganese: 10.2-12.5%; chromium: 24.5-26.5%; nickel: 13.5-16.5%; molybdenum: 3.2-4.8%; nitrogen: 0.75-0.95%; phosphorus: ≤0.03%; sulfur: ≤0.0025%; vanadium: 0.016-0.022%; niobium: 0.026-0.034%; copper: 0.2-0.35%; aluminum: 0.01-0.02%; cerium: 0.015-0.025%; and the balance of iron and inevitable impurities. The preparation method comprises the steps of raw material charging, vacuum melting, refining, nitrogen-added alloying, deoxidation and desulfurization, casting, electroslag remelting, and secondary casting. The preparation is implemented by using the processes of smelting in a pressurized induction furnace and electroslag remelting under a protective atmosphere; and nitrogen is added by using a method in which a nitrogen alloy and pressurized nitrogen permeation are combined.

The invention discloses a manufacturing method of an aluminum nitride copper-clad lining plate. The manufacturing method comprises the steps of laser cutting, protective film printing, by-product cleaning, solder printing, sintering, laminating exposure and development, copper etching, solder etching and plate splitting. By optimizing and integrating the process route, the aluminum nitride substrate with a'cutting seam 'does not need to be customized by a substrate supplier, so that the purchase cost is reduced; secondly, about 11% of solder printing is reduced, meanwhile, consumption of subsequent solder etching liquid medicine is reduced, and the manufacturing cost is reduced; the product area in contact with the alkaline liquid medicine is controlled on the cutting seam and the product surface within 10 microns of the edge of the cutting seam, so that adverse effects on the product are avoided; and the rubber discharging efficiency in the sintering stage is improved to a certain extent.

The invention provides a steel surface defect online detection method, device and system and a storage medium, and relates to the technical field of defect detection. The method comprises the following steps: acquiring a preset reference spot map; wherein the reference spot map is obtained by establishing a coordinate system for a first aluminum nitride spot image on the surface of a defect-free steel sample under a scanning electron microscope; after the target steel leaves the annealing furnace, generating raised aluminum nitride spots on the surface of the target steel through a pulse nitriding process by utilizing the residual temperature of the target steel; collecting a second aluminum nitride spot image on the surface of the target steel, converting the second aluminum nitride spot image into the coordinate system, and generating an online spot map; and taking the reference spot map as priori knowledge of a pre-trained defect identification model, inputting the online spot map into the defect identification model, and identifying the defect of the target steel. According to the invention, the interference of the steel surface condition and the image quality can be overcome, and the online detection accuracy and efficiency of the steel are improved.

The invention discloses a high-alloy steel nitriding-laser quenching composite surface strengthening method which comprises the following steps: sequentially polishing the surface of high-alloy steel by using 240-mesh waterproof abrasive paper and 2000-mesh waterproof abrasive paper, then sequentially putting the high-alloy steel into ethanol and acetone for ultrasonic cleaning, and nitriding the pretreated high-alloy steel to form a nitriding layer; and cooling to room temperature along with the furnace under the atmosphere of nitrogen or ammonia gas to obtain the high alloy steel containing the nitriding layer. And blackening treatment is conducted in the atmosphere of argon or nitrogen, then laser quenching treatment is conducted, and high alloy steel surface strengthening treatment is completed. According to the nitriding-laser quenching composite surface strengthening process, the problems that a high alloy steel nitriding layer is shallow (smaller than 0.2 mm), interface brittleness is achieved, and the retained austenite content is high (larger than 20%) are effectively solved, the total treatment time is shorter than or equal to 16 h, the surface hardness of a modified layer is larger than or equal to 600 HV0.1, the thickness of the modified layer is larger than or equal to 1.5 mm, and the nitriding-laser quenching composite surface strengthening process is suitable for preparing key components such as aviation gears and heavy-duty bearings.

The invention discloses non-quenched and tempered steel for an automobile piston and a production process of the non-quenched and tempered steel. The steel comprises the following chemical components in percentage by weight: 0.37%-0.40% of C, 0.60%-0.75% of Si, 1.40%-1.50% of Mn, less than or equal to 0.025% of P, 0.020%-0.040% of S, 0.10%-0.20% of Cr, 0.012%-0.025% of Alt, 0.08%-0.13% of V, 0.015%-0.030% of Ti, less than or equal to 0.05% of Mo, less than or equal to 0.10% of Ni, less than or equal to 0.10% of Cu, 0.015%-0.020% of N and the balance of Fe and inevitable impurities, and the ratio of Alt to N is 0.6-1.0. The RH-LF process is innovatively developed, and stable control over the nitrogen content, zero blockage of a water gap and reduction of bending deformation of steel are achieved in cooperation with the manganese nitride alloy, nitrogen control through bottom blowing of nitrogen, the Ca alloying process and the rolling heat preservation process.

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 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 discloses a rare earth alloy nitride composite soft magnetic material and a preparation method thereof, and belongs to the field of metal soft magnetic materials. The material comprises an alloy nitride and a coating layer which is positioned on the surface of the alloy nitride and coats the alloy nitride, wherein the composition of the alloy nitride is Ce2 (FexCo1-x) 17N3-delta, the composition of the coating layer is Fe4N, the rare earth alloy nitride composite material is expressed as Ce2 (FexCo1-x) 17N3-delta-coated Fe4N, x is the atomic ratio of Fe, and delta is a nitrogen deficiency coefficient. A nitrogen-rich compound is adopted for carrying out in-situ nitridation on a Ce2 (FexCo1-x) 17 material, Ce2 (FexCo1-x) 17N3-delta can be generated, a coating layer mainly comprising Fe4N can be formed on the surface of the Ce2 (FexCo1-x) 17N3-delta, and the composite material is obtained. Compared with Ce2 (FexCo1-x) 17, the composite material has the advantages that the eddy-current loss is obviously reduced while the high-frequency magnetism is improved.

The invention discloses an ultralow-temperature high-toughness non-magnetic steel flux-cored wire for a controllable nuclear fusion device and a preparation method of the ultralow-temperature high-toughness non-magnetic steel flux-cored wire. A special stainless steel strip is adopted to wrap a metal powder type flux core, and the flux core accounts for 29.6%-30.4% of the total mass of the flux-cored wire; the flux core comprises the following components: 14%-18% of electrolytic manganese, 21%-23% of chromium metal, 0.3%-1.0% of ferrotitanium, 4.4%-5.0% of nitrided ferrochromium, 27.5%-28.5% of nickel powder, 0.5%-1.0% of 52 # ferrosilicon, 8%-9% of molybdenum powder, 0.1%-0.3% of lithium fluoride and the balance of atomized iron powder. The problems that an existing non-magnetic steel welding material is insufficient in toughness and high in magnetic conductivity at the ultralow temperature of-269 DEG C are solved by optimizing flux-cored alloy elements of (nickel-chromium-nitrogen) synergistic stable austenite, matching with a manufacturing process of sealed baking and roller die drawing forming of powder at the temperature of 120-140 DEG C and a welding process protected by argon (Ar) with the purity of 99.999%. The AKV2 of a welded joint is larger than or equal to 34J at the temperature of-269 DEG C, the tensile strength is larger than or equal to 620 MPa, the relative permeability is smaller than or equal to 1.02, the problems that nitrogen of an existing solid welding wire is difficult to control, and hardening is easy can be solved, and the welding wire is completely matched with the extreme working condition of a controllable nuclear fusion device.

The invention belongs to the technical field of ceramic composite substrate processing, and discloses a high-strength and high-thermal-conductivity aluminum nitride ceramic composite substrate preparation device which comprises a preparation assembly, driving assemblies are arranged on the front side and the rear side of an inner cavity of the preparation assembly correspondingly, a discharging table is arranged on the inner sides of the driving assemblies, and a clamping structure is hinged to the outer side of the discharging table; a feeding mechanism and a discharging mechanism which are located below the discharging table are arranged on the two sides of the preparation assembly correspondingly. Through the arrangement of the connecting rod and the corrugated block, when the driving assembly operates, the whole discharging table is driven to move upwards through the transmission chain, the connecting rod is driven to move to the outer side of the corrugated block, then the corrugated block extrudes the connecting rod and drives the connecting rod to move in a reciprocating mode, and meanwhile the connecting rod drives the movable block to move; and the whole supporting frame is driven to rotate, so that the green body rotates on the inner side of the heating plate, the green body is uniformly sintered, and flaws are avoided.

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.

This invention proposes a metal soft magnetic powder core with excellent low-frequency magnetic properties and its preparation method, belonging to the field of magnetic materials. Using at least nano-boron powder and iron-silicon soft magnetic alloy powder as raw materials, high-temperature diffusion and high-temperature nitriding treatments are employed. Part of the nano-boron powder forms a high-resistivity iron-silicon-boron permeation layer on the surface of the iron-silicon soft magnetic alloy powder, while some nano-boron powder forms a boron nitride insulating layer with both high resistivity and high thermal stability between the iron-silicon soft magnetic alloy powders, effectively controlling eddy currents. Hot pressing further increases the density of the metal soft magnetic powder core, reduces the demagnetizing field, thereby improving permeability and reducing hysteresis loss. Thus, excellent low-frequency magnetic properties of high density, high permeability, and low loss are simultaneously obtained in the metal soft magnetic powder core.

The invention belongs to the technical field of material surface modification, and discloses a plasma electrolytic nitriding method for a laser cladding high-entropy alloy layer, which comprises the following steps: S1, providing an electrolyte for plasma electrolytic nitriding; s2, the pretreated workpiece serves as an anode, graphite serves as a cathode, a power source is switched on, and the anode and the cathode are immersed in the electrolyte in the high-voltage environment with the voltage being 270-350 V; s3, after the voltage is slowly reduced to 140 V to 260 V, liquid-phase plasma electrolytic nitriding treatment is conducted for 5 min to 25 min; wherein a FeCoCrNi high-entropy alloy layer is formed on the workpiece through laser cladding treatment in a cladding manner. The plasma electrolysis nitriding technology is used for nitriding the high-entropy alloy cladding coating subjected to laser cladding, a high-quality nitriding layer with higher surface hardness, higher wear resistance and corrosion resistance and a compact and controllable structure can be obtained, the method is more environmentally friendly and energy-saving, the effect on stainless steel and other materials difficult to treat is remarkable, and thermal deformation of a workpiece can be greatly reduced.

The application discloses a micro-smoke and odor-free cast steel environment-friendly regenerated coated sand process, which replaces a lubricant with hydroxyethyl ethylene bis-stearamide and corresponding auxiliary triisopropyl phosphate, significantly enhances the hot tensile strength and environmental protection of the coated sand, removes the solidified resin on the surface of the coated sand through a frozen shell breaking mode, greatly improves the shell breaking rate of the coated sand waste sand through modified aluminum nitride and preparation of a shell breaking auxiliary, and prepares a friction auxiliary to enhance the particle shaping of the coated sand regenerated sand, and further enhances the flowability of the coated sand prepared from the regenerated sand.

The invention relates to the technical field of detection of particles mingled in steel. Specifically, the invention relates to a method for detecting aluminum nitride inclusion particles in steel. The method comprises the step of detecting by using an inclusion particulate matter analysis system comprising a scanning electron microscope (SEM) and an energy dispersive spectrometer (EDS), wherein element types collected by the energy dispersive spectrometer comprise an oxygen element. According to the scanned data, the aluminum nitride inclusion particles in the steel can be more accurately screened out, the aluminum oxide inclusion particles which are not easy to distinguish in the prior art are eliminated, the screening result is high in accuracy and efficiency, and the form, the number, the size, the size distribution and the like of the aluminum nitride inclusion particles in the steel can be visually and clearly analyzed from the detection result.

Method of manufacturing a steel strip comprising the steps of: - casting a molten steel into a slab; - reheating the slab at a temperature of 1150°C or more for a time of 1 hour or more; - hot rolling the steel into a strip, preferably using an average F1 slab entry temperature of more than 1000°C; - coiling the hot rolled steel strip; - batch annealing the steel strip: - at a temperature in the intercritical range (i.e. between Ac1 and Ac3), preferably less than 700°C; - in a non-oxidizing and non-nitrogenizing atmosphere; - for a total annealing time of at least 5 hours, preferably at least 10 hours so as to obtain: a Mn enrichment in austenite such that the Mn content is at least 1.25 times the overall Mn content of the steel; and a C enrichment such that the C content is at least 1.2 times the overall C content of the steel; - cooling the steel after batch annealing in air, forced air or water quenching.

This invention provides an engine valve and a method for manufacturing the same, which can suppress galvanic corrosion even when dissimilar metals are joined, and which exhibits excellent wear resistance and corrosion resistance, for use in engines that use CNG, LPG, or alcohol as fuel. [Solution] The engine valve 10 of the present invention is a joint member in which a shaft portion 14 made of martensitic heat-resistant steel SUH11 and a umbrella portion 12 made of austenitic heat-resistant steel SUH35 are joined. A nitride layer is formed only on the surface of the base material on the shaft portion 14 side from the joint portion 13 between the shaft portion 14 and the umbrella portion 12, leaving the surface of the base material exposed on the umbrella portion 12 side from the joint portion 13.

A cutting tap is provided which suppresses breakage and wear of a blade during tapping and has high durability. In a nitriding treatment step (P2), a nitrogen diffusion layer in which nitrogen atoms contained in an atmosphere gas diffuse from the surface of a tool base material of the cutting tap under heating is formed, and then, in a honing treatment step (P3), an abrasive particle is made to collide with a cutting blade portion of the tool base material of the cutting tap to round the cutting blade portion and remove a blade tip. The cutting blade portion is made to have a thick nitrogen diffusion layer in advance by diffusion from a rear clearance face and diffusion from a front rake face, and the nitrogen concentration and hardness of the blade tip of the cutting blade portion are relatively high and mechanically brittle. Therefore, by removing the mechanically brittle blade tip, wear and breakage of the cutting blade portion of the cutting tap are reduced, and a tool performance capable of maintaining good cutting performance for a long period of time can be obtained.

The invention provides a rare earth iron alloy and a preparation method of nitride thereof, and belongs to the technical field of rare earth magnetic materials. According to the method, a high-purity phase rare earth-iron compound Yb2Fe17 is obtained by combining a briquetting sealing means with a reduction diffusion technology, the high-purity phase rare earth-iron compound Yb2Fe17 is converted into Yb2Fe17N3-delta through a controllable nitriding technology, redundant CaO is removed through water washing, and high-purity Yb2Fe17N3-delta is obtained through drying. The preparation method of the rare earth iron alloy and the nitride thereof, provided by the invention, has the advantages of simple process, low energy consumption, high purity, small crystal grains and the like, and successfully solves the problem that a pure phase is difficult to successfully prepare by means of electric arc melting and the like due to high volatility of Yb. The method provided by the invention is also suitable for preparing volatile alloy materials containing Sm, Mn and the like. The method has remarkable technical advantages in preparation of materials containing volatile alloys.

The invention provides a preparation method of a high-wear-resistance alloy lining plate, and relates to the technical field of wear-resistance alloys, carbon steel and pig iron are mixed, heated and melted, high-carbon ferromanganese, medium-carbon ferrochrome and ferrosilicon are added, heating refining is carried out, aluminum powder is added, the mixture is put into a mold, cooling and demolding are carried out, heating homogenization, quenching and cooling are carried out, and a mother plate is prepared; mixing bismaleimide, the composite powder and sepiolite fibers, heating and stirring, coating a mother board with the mixture, firstly applying negative pressure, then applying positive pressure, heating and cooling to obtain a substrate layer; and placing the mother board in magnetron sputtering equipment, sputtering on the substrate layer to obtain a chromium nitride functional layer, and cooling to obtain the high-wear-resistance alloy lining board. The composite powder is prepared by mixing and heating chromium carbide powder and a hydrogen peroxide solution, filtering, mixing with an ethanol solution and gamma-aminopropyltriethoxysilane, heating, condensing and refluxing, washing and drying, and mixing and heating with amine-terminated polyether and N, N-dimethylformamide. The wear-resistant stability of the alloy lining plate can be improved.

The invention discloses a surface treatment process for improving the high-temperature wear resistance of a stirring head. The surface treatment process comprises the following steps: 1) cleaning a stirring needle and the bottom of a shaft shoulder for three times by using distilled water, and blow-drying for plating; (2) dipping a plating pen in the composite brush plating solution to carry out electroplating brush treatment on the stirring needle and the bottom surface of the shaft shoulder, wherein the thickness of a plating layer is not less than 80 microns; the composite brush plating solution comprises a nickel-cobalt plating solution, tungsten nitride, chromium nitride and composite powder, wherein the composite powder comprises metal titanium powder, tin powder and chromium powder; by adopting the composite brush plating technology, the stirring needle and the shaft shoulder bottom of the stirring head are subjected to local surface treatment, the hardness of the stirring needle and the shaft shoulder bottom subjected to brush plating is obviously improved, the room-temperature and high-temperature wear resistance is obviously improved, the service life of the stirring head is prolonged, and the production cost of an enterprise is reduced.

A vane (127) for dividing a cylinder chamber surrounded by a cylinder (121T), a piston (125T), and an end plate (160T) of a compressor (1) into a suction chamber (131T) and a compression chamber (133T), the vane (127) being provided with a base material (210) formed of a material having a chromium content of more than 4.5 wt%, and a hard coating (220) covering a front end surface (129a) of the base material (210), the base material (210) having formed therein a base material layer (211) and a nitridation diffusion layer (212), alternatively, in addition to the base material layer (211) and the nitridation diffusion layer (212), a fine layer (213) having Fe4N as the main component is formed on the nitridation diffusion layer (212), and the hard coating (220) is formed on the surface of either the nitridation diffusion layer (212) or the fine layer (213) of the base material (210).

A method for producing a Mo-N based coating structure, comprising providing a substrate (1) to be coated and applying a hard material layer (6) onto the substrate (1), the hard material layer (6) comprising at least one layer (4) of Mo-N having a hexagonal crystal structure and at least one layer (5) of Mo-N having a cubic crystal structure or a mixed hexagonal / cubic crystal structure, the hard material layer (6) being applied by a low-temperature closed-field unbalanced reactive magnetron sputtering coating process.