117 results about "Chromium nitride" patented technology

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 the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method of the high-temperature-resistant flux-cored wire. The high-temperature-resistant flux-cored wire containing the rare earth elements comprises a welding wire skin and a flux core. The flux core comprises the following raw materials of dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, ferro-aluminum, potassium cryolite, potassium titanate, sodium titanate, fine iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, nitrided ferrochrome, bismuth oxide, auxiliaries and the balance reduced iron powder. The auxiliary agent is a mixture of a zirconium-iron alloy, a titanium-iron alloy and an aluminum-magnesium alloy. A specific alloy auxiliary is introduced into the flux core to protect stable transition of rare earth yttrium, yttrium and multiple components synergistically optimize the weld joint performance, 253MA heat-resistant steel is matched, slag and electric arc regulation and control components and a reasonable process are matched, and the welding quality of the welding wire is improved.

The invention provides a high-toughness austenitic stainless steel welding rod for 5Ni steel and a preparation method of the high-toughness austenitic stainless steel welding rod. The welding rod comprises a core wire and a coating coated on the surface of the core wire, and based on the total amount of the core wire, the core wire comprises the following components in percentage by mass: less than or equal to 0.09% of C, less than or equal to 0.15% of Si, 1.6-2.5% of Mn, 18.5-20.5% of Cr, 12.5-14.5% of Ni, 2.1-3.2% of Mo and 0.06-0.18% of Ti; 0.12-0.24% of Al, less than or equal to 0.007% of S, less than or equal to 0.008% of P, less than or equal to 0.006% of O, less than or equal to 0.001% of H, less than or equal to 0.012% of S + P, and the balance Fe and inevitable impurities. On the basis of the total amount of the coating, the coating comprises, by mass, 28-38% of carbonate, 15-20% of fluorite, 1-3% of lithium fluoride and sodium fluoride, 8-12% of synthetic mica, 3-6% of potassium silicotitanate, 2-4% of zircon sand, 9-15% of electrolytic manganese metal, 2-4% of ferrotitanium, 2-5% of passivated nickel-magnesium alloy, 1-3% of atomized ferrosilicon, 1-3% of lanthanum cerium fluoride, 1-3% of tungsten and molybdenum, 3-5% of nitrided ferrochromium and 1-2% of CMC. The welding rod is good in all-position welding controllability, extremely low in air hole sensitivity and excellent in low-temperature toughness, and can meet the requirements for high-quality and efficient welding of 5Ni steel.

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 relates to the technical field of coatings, in particular to a PVD (Physical Vapor Deposition) coating process method applied to a galvanized sheet stamping die, which comprises the following steps of: pretreating the die, cleaning the surface of the die by a wet process, placing the die in a vacuum deposition cavity, vacuumizing, and heating to a preset temperature in an inert gas environment; plasma pretreatment is conducted on the surface of the mold, a high-power pulse magnetron sputtering cathode of a chromium target is selected to discharge in the argon working environment to generate plasma rich in chromium ions, and negative bias voltage is applied to the mold; starting at least one unbalanced magnetron sputtering cathode, gradually increasing the target current by the unbalanced magnetron sputtering cathode in a current ramp-up mode so as to improve the target voltage, and synchronously introducing nitrogen as a reaction gas, so that a nitride transition layer is deposited on the surface of the mold; and a high-power pulse magnetron sputtering cathode and an unbalanced magnetron sputtering cathode synchronously work on the transition layer to carry out multi-source reactive sputtering deposition, so that a multi-layer hard coating formed by alternating titanium aluminum vanadium and chromium nitride is formed. By combining the high-power pulse magnetron sputtering technology and the unbalanced magnetron sputtering technology, the problems that in the prior art, a coating is poor in adhesive force and insufficient in high temperature resistance are solved.

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.

The application relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method thereof. The high-temperature-resistant flux-cored wire containing rare earth elements comprises a wire sheath and a core; the core comprises the following raw materials: dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, aluminiferous iron, potassium cryolite, potassium titanate, sodium titanate, iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, chromium-iron nitride, bismuth oxide, an additive, and the balance of reduced iron powder; the additive is a mixture of zirconium-iron alloy, ferrotitanium alloy and aluminum-magnesium alloy. The application introduces a specific alloy additive into the core to protect the transition of the rare earth yttrium, optimizes the welding performance of the yttrium and multiple components in cooperation, matches the 253MA heat-resistant steel, adjusts the components of the molten slag and the electric arc, and reasonably processes the technology, so that the welding quality of the wire is improved.

One aspect of the present invention is a layered film–coated glass plate (100) that includes: a glass plate (10) that has a first principal surface (11) and a second principal surface (12); and a layered film (20) that is on the first principal surface (11). The layered film (20) has, in order from the first principal surface (11) side, a first dielectric layer (21), a first functional layer (22), a second dielectric layer (23), a second functional layer (24), and a third dielectric layer (25). The first functional layer (22) and the second functional layer (24) contain at least one of titanium nitride, chromium nitride, zirconium nitride, and tantalum nitride, and the first dielectric layer (21), the second dielectric layer (23), and the third dielectric layer (25) contain silicon nitride or aluminum nitride. The first dielectric layer (21) has a film thickness of 60–150 nm and a visible light transmittance of no more than 8%. The visible light transmittance on the second principal surface (12) side is no more than 35%.

There is provided an object holder configured to support an object, the object holder comprising a support surface having a plurality of support elements, the support elements comprising a metal-Si multilayer, a metal-Ge multilayer, and / or a chromium nitride layer, the metal-Si multilayer, the metal-Ge multilayer, and / or the chromium nitride layer are thermally treated to provide a selectively alterable height of the respective support elements, via a thermal treatment of the metal-Si multilayer, the metal-Ge multilayer, and / or the chromium nitride layer. Also provided are a stage comprising such an object holder, an apparatus for controlling the flatness of a surface comprising such an object holder, an optical element for a lithographic apparatus, an apparatus for controlling the flatness of a surface, a lithographic apparatus or tool comprising such an object holder, and a method of manufacturing the same. A method of controlling the shape of a surface, a method of manufacturing an object holder, a method of correcting the flatness of an object holder or an optical element, and the use of such an apparatus or method in a lithographic apparatus or process.

The present application relates to a kind of metal surface high wear-resistant corrosion-resistant composite strengthening layer and preparation method thereof, the composite strengthening layer is composed of bearing layer, transition layer, functional layer, bearing layer is nitriding layer, transition layer is oxygen permeation layer, functional layer is nanocomposite ceramic layer, bearing layer preparation method is ion nitriding, thickness is 20 μm~300 μm;Transition layer thickness is 1 μm~3 μm, is prepared by three-stage ion oxygen permeation;Functional layer preparation method is the composite layer of vacuum ion deposition chromium nitride layer and multinary nitride layer.The composite strengthening layer of the present application is small, and the organization structure is dense, and the combination strength is high, and the surface hardness is high, and the friction coefficient is small, the composite strengthening layer combines the performance advantage of single strengthening layer, that is, it has better wear resistance, and it also has better corrosion resistance, especially improves the wear resistance and corrosion resistance of part in service condition, especially suitable for the sealing surface strengthening of chemical ball valve.

A method for producing a chromium nitride (CrN) thin film is provided. The method includes reactive radio frequency magnetron sputtering chromium onto a substrate in the presence of a gaseous mixture including nitrogen and argon to form the CrN thin film, where a ratio of the nitrogen gas to the argon gas is 1:2 to 1:10, and where the CrN thin film has an average thickness of 500 to 1500 nm. The CrN film as prepared by the method of the present disclosure can be used in sensors for cryogenic temperature.

The invention discloses a wear-resistant steel-based mold material for plastic magnetic injection molding and a preparation method of the wear-resistant steel-based mold material, and relates to the technical field of mold steel materials. When the steel-based mold material is prepared, metal chromium, titanium powder, ferromolybdenum, graphite, ferroboron, lanthanum iron and electrolytic iron are weighed according to a specific proportion, and a cast ingot is obtained through vacuum induction melting and argon protection pouring; a calcium fluoride-aluminum oxide-calcium oxide mixed slag system serves as a remelting medium, electroslag remelting, homogenization treatment and oil quenching are conducted on the cast ingot, and a steel ingot is obtained; the steel ingot is subjected to multidirectional forging and temperature-controlled cooling, and forged die steel is obtained; and finally, the forging die steel is subjected to gas nitriding subzero treatment and multi-stage tempering, gradient titanium nitride and chromium nitride metal ceramic layers are induced to be formed on the surface, and the wear-resistant steel-based die material for plastic magnetic injection molding is prepared. The prepared steel-based mold material has high hardness, high wear resistance and corrosion resistance.

The invention relates to the technical field of hydrogen protection, in particular to a hydrogen-resistant wear-resistant coating as well as a preparation method and application thereof. The invention provides a hydrogen-resistant wear-resistant coating which comprises a Zr metal bonding layer, a periodic nano multilayer and a chromium nitride sealing top layer which are sequentially stacked from bottom to top, the periodic nano multilayer comprises CrN ceramic layers and Zr metal layers which are sequentially and alternately stacked on the surface of the Zr metal bonding layer; and the Zr metal bonding layer is made of Zr. The hydrogen-resistant wear-resistant coating has excellent hydrogen resistance and wear resistance at the same time.

The invention provides a method for depositing a GLC film on the basis of the surface of a plastic workpiece through a PVD technology and the corresponding plastic workpiece. The method comprises the steps that S1, the plastic workpiece is subjected to ultrasonic cleaning and baking; s2, a chromium target, a tungsten target and a graphite target are washed through multi-arc ion plating magnetron sputtering coating equipment; s3, vacuumizing the placed plastic workpiece, and introducing argon to open a chromium target to form a metal chromium layer; s4, starting a chromium target and a tungsten target for introducing argon to form a metal chromium-tungsten layer; s5, argon and nitrogen are introduced for starting a bias power supply, a chromium target and a tungsten target are started, and a chromium tungsten nitride layer is formed; s6, turning on a bias voltage power supply, turning off nitrogen, turning on a chromium target, a tungsten target and a graphite target, and introducing argon and acetylene to adjust bias voltage, so as to form a multi-element nano multilayer film structure; s7, turning on a bias power supply, turning off the tungsten target, turning on the chromium target and the graphite target, and introducing argon and acetylene to form a GLC film layer; and S8, a target material power supply, acetylene, argon and a bias power supply are turned off, and the plastic workpiece is cooled.

The invention discloses a low-temperature steel flux-cored wire and a preparation method and application thereof, and belongs to the field of flux-cored wires. The flux-cored wire comprises a stainless steel strip and flux-cored powder filled in the stainless steel strip, and the flux-cored powder comprises, by mass, 37%-41% of electrolytic nickel powder, 18%-22% of metal chromium powder, 2.2%-3.2% of chromium nitride, 2.0%-3.5% of molybdenum powder, 16%-21% of electrolytic manganese powder, 1.6%-1.8% of pre-alloyed silicon-titanium-iron powder, 0.45%-0.55% of rare earth silicon iron, 0.6%-0.8% of vanadium nitride, 0.4%-0.6% of yttrium-stabilized zirconia, 0.08%-0.12% of boron-nickel alloy, 1.5%-2.0% of ferroniobium powder and the balance iron powder. And the balance iron powder. Through the design of the low-carbon and high-alloy flux core powder, the strength of a welding material is matched with that of a low-temperature steel base material, and good toughness, high strength and excellent corrosion resistance of the material are kept in an extremely low-temperature environment.

The present application relates to hydrogen protection technical field, especially to a kind of hydrogen barrier wear-resistant coating and its preparation method and application.The present application provides a kind of hydrogen barrier wear-resistant coating, from bottom to top, including the Zr metal bonding layer, periodic nanometer multilayer and chromium nitride top layer that are sequentially stacked;The periodic nanometer multilayer includes CrN ceramic layer and Zr metal layer that are sequentially and alternately stacked on the surface of the Zr metal bonding layer;The material of the Zr metal bonding layer is Zr.The hydrogen barrier wear-resistant coating simultaneously has excellent hydrogen barrier performance and wear resistance.

The application relates to a thin film structure, a cubic boron nitride thin film structure, a cutting tool and a manufacturing method and equipment thereof, the thin film structure comprising a preliminary bonding layer-intermediate bonding layer-NCD; wherein the preliminary bonding layer comprises one of CrN and TiN; and the intermediate bonding layer comprises at least one of an oxidation thin film and a nitrogen-oxygen thin film. The preliminary bonding layer such as chromium nitride or titanium nitride is combined with the intermediate bonding layer to bond nanometer polycrystal diamond, under the premise of the hardness of the nanometer polycrystal diamond, so that the cobalt element of the related tool such as a hard alloy surface cannot affect the thin film formed by the nanometer polycrystal diamond, thereby the cobalt element on the surface of the hard alloy is not removed, and under the premise of keeping the smoothness of the tool surface, the process of removing the cobalt element on the surface of the hard alloy by using chemical liquid is avoided, and therefore the application has the advantages of simple process and small pollution.

The application provides a high-strength and high-toughness probe and a manufacturing method thereof. The probe material contains components such as chromium, niobium and copper, which can form a strengthening phase and have excellent corrosion resistance. Nitride coating is formed through nitriding treatment, such as chromium nitride, which can form a hard surface and strengthen the wear resistance of the material surface. The surface plating layer can improve the conductivity of the probe. In the process, heat deformation and dynamic recrystallization of the material can be formed through hot rotary rolling process, so as to effectively refine the grain, realize the fine crystallization of the material, effectively reduce the alloy impurities through multiple melting, and improve the purity of the alloy material, so as to effectively enhance the strength and flexibility of the material and prevent the probe tip from breaking. The method has simple equipment, is flexible and reliable, has strong universality, can realize the production of various high-strength and high-toughness probes at low cost, and the material also has excellent corrosion resistance and can be used to manufacture corrosion-resistant high-strength wires.

The invention discloses a stainless steel current collector for a lithium iron phosphate positive electrode and a preparation process thereof, and relates to the technical field of lithium batteries. Comprising the following steps that 1, 316L stainless steel foil serves as a substrate and is washed and dried for use; 2, sputtering and depositing chromium nitride on the surface of the 316L stainless steel foil to form a chromium nitride layer; 3, the surface of the chromium nitride layer of the 316L stainless steel foil is coated with the functional coating slurry, drying is conducted, and a functional coating is formed; and obtaining the stainless steel current collector.

The invention discloses a friction pair surface treatment method based on a brush electroplating and arc ion plating composite process, which comprises the following steps: carrying out brush electroplating pretreatment through matrix pretreatment, electrocleaning treatment, pickling treatment and activating treatment; a nano nickel-based composite coating is formed on the surface of a driving part of the friction pair by adopting an electric brush plating method; a chromium nitride plating layer is formed on the surface of a driven part of the friction pair through an arc ion plating method; the driving part of the friction pair and the driven part of the friction pair are constructed to form the friction pair, and the friction pair is subjected to opposite abrasion testing. A nickel-based nano composite coating is prepared on the surface of a metal matrix by adopting an electric brush plating technology, and a chromium nitride coating is prepared on the surface of steel by combining an electric arc ion plating technology, so that a friction pair structure which works cooperatively is formed, a composite coating system is optimized, and the mechanical wear resistance of a friction pair is improved, so that the use requirements under complex working conditions are met.

The utility model relates to the technical field of parts of extruders, in particular to a screw rod and an extruder with the screw rod. Wherein the tooth starting position of the screw is arranged at a position 6-10cm behind a feeding section of the screw extruder. Compared with the prior art, the screw rod is a novel screw rod, and the novel screw rod has the advantages that the tooth forming position is closer to the rear compared with the tooth forming position of a common screw rod, the material friction and conveying effect is better, the raw material extrusion precision is improved, and the phenomena that the screw rod slips and the pressure of a discharge port of a machine head is unstable are reduced; compared with a screw rod with the same size, the depth of the screw groove is deepened, so that the screw groove can contain more materials, the friction force between the materials and the screw rod is increased, the materials are effectively conveyed, the qualified rate of extruded pipe finished products is improved, and the complex operation of manually adjusting the extrusion amount of the screw rod is avoided; and the coating of the screw rod adopts a chromium nitride coating, has the characteristics of corrosion resistance, wear resistance, high pressure resistance and high temperature resistance, can be suitable for most plastic particles, and has better universality.

The utility model relates to the technical field of engines, in particular to a valve seat, a methanol ejector and an engine. The utility model provides a valve seat which is suitable for a methanol injector and comprises a valve seat body and a corrosion-resistant structure, and the valve seat body is provided with an oil passing channel and an injection hole communicating with the oil passing channel; a needle valve part of the methanol ejector is positioned in the oil passing channel and axially moves relative to the valve seat; a sealing part is arranged on a part of the peripheral surface of the needle valve piece, a sealing surface is formed on a part of the inner wall surface of the oil passing channel, and the sealing part of the needle valve piece is matched with the sealing surface of the oil passing channel to close the spray hole; the corrosion-resistant structure is arranged on the sealing face and comprises at least one chromium coating and at least one chromium nitride coating. The methanol ejector comprises the valve seat. The problem of cavitation of the sealing face of the valve seat of the methanol ejector can be effectively solved, the sealing performance of the valve seat is improved, then the working stability of the methanol ejector is improved, leakage is reduced, and the service life is prolonged.

The invention provides a pot container, a cooking utensil and a manufacturing method of the pot container. The pot container comprises a base body and a coating film. The substrate has a first surface. The coating film comprises a bottom layer, a middle layer and a surface layer. The bottom layer is attached to the first surface through physical vapor deposition, and the bottom layer is a chromium nitride layer. The middle layer is attached to the bottom layer through physical vapor deposition, and the middle layer is a mixed layer of titanium nitride and metallic titanium. The surface layer is attached to the middle layer through physical vapor deposition, and the surface layer is a chromium nitride layer or a mixed layer of chromium nitride and titanium nitride. The first surface of the substrate provides an adhesion basis for the coating film. The bottom layer, the middle layer and the surface layer are sequentially arranged, the layers are tightly combined through the physical vapor deposition technology, the binding force of the coating film and a base body is enhanced, and the problem that the coating film falls off or peels off in the using process is solved. In the scheme, through the arrangement of the middle layer, the coating film has a brand-new structure. All the layers can be tightly combined and mutually supported, so that the non-stickiness is obviously improved.

An object holder configured to support an object is provided. The object holder has a support surface having multiple support elements comprising a metal-Si multilayer film, a metal-Ge multilayer film, and / or a chromium nitride layer, and the individual heights of the support elements can be selectively changed by heat treatment of the metal-Si multilayer film, the metal-Ge multilayer film, and / or the chromium nitride layer. Also provided are an object table comprising such an object holder, an apparatus for controlling the flatness of a surface comprising such an object holder, an optical element for a lithography apparatus, an apparatus for controlling the flatness of a surface, a lithography apparatus or tool comprising such an object holder, a method for controlling the shape of a surface, a method for manufacturing an object holder, a method for correcting the flatness of an object holder or optical element, and the use of such an apparatus or method in a lithography apparatus or process.

To provide a non-stick pan with a silicon nitride or chromium nitride layer. [Solution] A metal pot body has a layer of silicon nitride, chromium nitride, aluminum nitride, or titanium nitride evenly distributed on the surface that comes into contact with food, with the layer having a thickness of 0.02 μm to 100 μm. This reduces the amount of heat directly transferred from the pot body to food, preventing overheating and burning of the food. Non-stick pots with the addition of such nitrides maintain the original color of stainless steel 2 for long periods of use, exhibit good non-stick properties, and are easy to clean.

The invention relates to the technical field of metallurgy, and particularly discloses a material modifier for ultrahigh-chromium high-carbon cast iron, the ultrahigh-chromium high-carbon cast iron and a smelting method of the ultrahigh-chromium high-carbon cast iron. The material modifier for the ultrahigh-chromium high-carbon cast iron is alloy metal powder and comprises the following raw materials in parts by weight: 6-8 parts of ferroniobium powder, 0.2-0.4 part of chromium nitride, 0.2-0.4 part of tungsten nitride, 0.15-0.25 part of vanadium nitride, 0.3-0.5 part of molybdenum nitride, 0.5-1.5 parts of chromium carbide and 3-5 parts of silicon carbide. The impact toughness and Rockwell hardness of the ultrahigh-chromium and high-carbon cast iron using the material modifier for the ultrahigh-chromium and high-carbon cast iron are as high as 4.90 J / cm < 2 > and 68.5 HRC, the toughness and hardness of the ultrahigh-chromium and high-carbon cast iron are improved, the minimum wear rate is 0.30%, and the ultrahigh-chromium and high-carbon cast iron has high wear resistance.

The invention discloses a high-purity high-nitrogen-content cobalt-chromium-molybdenum alloy and a preparation method thereof. The alloy comprises, by weight, 27%-30% of Cr, 5%-7% of Mo, 0.15%-0.35% of C, 0.6%-1% of Si, 0.3%-0.5% of Mn, 0.10%-0.20% of N, the limited amount of Mg, Ni, Fe, P, S, Al and the balance Co. The preparation method comprises the following steps: carrying out surface purification and drying pretreatment on electrolytic cobalt and casting excess materials; adding part of the raw materials into a vacuum induction furnace, and melting after high vacuum pumping; after the new materials are melted down, casting excess materials are added, and inert gas with a certain pressure is filled to restrain splashing; after refining, introducing argon-nitrogen mixed gas in a specific proportion, and adding residual raw materials and chromium nitride in batches under the protection of the argon-nitrogen mixed gas; and after uniform melting, the temperature is adjusted for fixed-point pouring. According to the method, the problems that in the prior art, the nitrogen yield is unstable, the oxygen content and inclusions are high, and splashing is serious in the smelting process are effectively solved, stable preparation of the high-purity cobalt-chromium-molybdenum alloy with the high nitrogen content, the low oxygen content and the low inclusions is achieved, meanwhile, casting excess materials can be used in a large proportion, and cost is reduced.

The invention discloses a smelting method of G115 martensite heat-resistant steel. The smelting method comprises the steps of slag-free tapping of an electric arc furnace, LF large-slag-amount white slag refining, VD deep degassing, B / N coordinated regulation and control, soft argon blowing pouring and the like. The method is characterized in that low-carbon low-phosphorus chromium alloy and high-purity electrolytic cobalt are selected and added in batches at controlled temperature; nitrogen is supplemented with chromium nitride alloy, Fe-B alloy wrapped by pure iron foil is inserted in batches, and the content of N and the content of B are accurately controlled; and Ca-Si line deoxidation and soft argon blowing for inclusion removal are matched with argon injection protection in the atmosphere. According to the process, redundant procedures are omitted, the production cycle is shortened, the content of sensitive elements such as carbon, boron, nitrogen and cobalt is effectively controlled, O in the molten steel is smaller than or equal to 25 PPm, the inclusion removal rate is larger than or equal to 95%, and the endurance strength at the high temperature of 650 DEG C is larger than or equal to 135 Mpa.

The main technical problem to be solved by the present invention is to provide a compressor capable of reducing heat generated by sliding. In a compressor having a compression mechanism part for compressing a refrigerant in a sealed container, the refrigerant is an unsaturated refrigerant or a mixed refrigerant including an unsaturated refrigerant, the compression mechanism part includes chromium, and the compression mechanism part includes a first member and a second member that slide relative to each other. A mixed layer containing chromium nitride and titanium nitride is formed on the surface of the first member, the titanium nitride in the mixed layer is distributed such that the concentration of the titanium nitride increases and decreases regularly in the thickness direction of the mixed layer, and a carbide is deposited on the surface of the second member.