504 results about "Oxidation resistance" patented technology

The invention discloses a graphite piece silicon carbide coating and a preparation method thereof, and belongs to the technical field of inorganic non-metallic materials. The method comprises the following steps: firstly, carrying out surface polishing, cleaning and drying pretreatment on a graphite piece; then a solution containing phosphinazine functionalized silazane and a boron-silicon carlamide compound is adopted for spraying the pretreated graphite piece, drying and curing are conducted, and a surface modification layer is formed; and finally, placing the surface-modified graphite piece in chemical vapor deposition equipment, and depositing at specific temperature, pressure and atmosphere to form the silicon carbide coating. According to the method, uniform nucleation and crystallization of the silicon carbide coating are effectively promoted through unique surface modification treatment, and the compactness and uniformity of the coating and the binding force of the coating and a matrix are remarkably improved. The obtained coating graphite piece has excellent thermal corrosion resistance, oxidation resistance and mechanical property, the service life and the use frequency of the coating graphite piece in semiconductor epitaxial equipment are remarkably prolonged, the whole preparation process is environmentally friendly, and the coating graphite piece is suitable for coating treatment of a large graphite base material.

The invention provides a method for preparing a zirconium boride ceramic material through pressureless sintering, and belongs to the technical field of zirconium boride ceramics. The method comprises the steps of preparing zirconium boride composite powder, modifying silicon carbide nanowires and mixing and sintering. The method for modifying the silicon carbide nanowire comprises the steps of acid treatment and modification, the modification step comprises the following steps: adding aluminum isopropoxide into absolute ethyl alcohol, adding a nitric acid solution, stirring for 1.5-2.0 hours at the temperature of 60-63 DEG C, adding the acid-treated silicon carbide nanowire, carrying out ultrasonic dispersion and water bath evaporation, then drying, putting into a muffle furnace, and carrying out heat preservation for 2.0-2.2 hours at the temperature of 490-500 DEG C to obtain a modified silicon carbide nanowire; the ceramic material prepared by adopting the method disclosed by the invention is high in density, good in mechanical property and excellent in high-temperature oxidation resistance and stability in a complex environment.

The invention discloses high-conductivity low-temperature sintering composite copper paste and a preparation method and application thereof, and belongs to the technical field of conductive paste. The composite copper paste consists of the following components in percentage by mass: 70-90% of a conductive phase, 2-10% of a binding phase and the balance of an organic carrier. Wherein the conductive phase comprises cuprous hydride modified copper powder and a copper complex; the copper complex is formed by a copper compound and an organic ligand through a coordination reaction. The copper paste can be sintered to form an electrode or a circuit in a nitrogen atmosphere at a temperature of less than or equal to 300 DEG C, and has the advantages of low resistivity, good oxidation resistance, strong adhesion and the like, and the cost of the copper paste is obviously lower than that of silver paste. The invention also provides a preparation method of the composite copper paste and an application of the composite copper paste in preparation of an electronic component electrode or a conductive circuit.

The application belongs to the technical field of welding materials, and discloses a preformed soldering sheet and a preparation method thereof, the preparation method comprising: a flux preparation method, wherein benocyclobutene resin, a thixotropic agent, an active agent, a surfactant, an antioxidant, a corrosion inhibitor and a solvent are weighed, mixed and heated and stirred to mix, and then cooled to obtain the required flux; a processing method of a preformed soldering sheet body soldering strip, wherein lead-free filler metal is melted at high temperature to form a soldering strip; and a preformed soldering sheet preparation method, wherein the soldering strip is uniformly coated with the flux by a coating machine, and the flux is cured and attached to the soldering strip after baking; the preformed soldering sheet is obtained by the above preparation method. The application realizes improved welding quality of the soldering sheet coated with the flux film and solder metal oxidation resistance, and the preformed soldering sheet has high stability, good wettability and good weldability, and can meet the requirements of the market for the use of the preformed soldering sheet with low cavities.

The utility model belongs to the field of door and window sealing strips, and particularly relates to a high-sealing dustproof sealing strip which comprises a sealing strip body, the sealing strip body comprises a limiting shell, an adhesive layer is arranged at the bottom of the limiting shell, and an arc-shaped sealing gasket is arranged in an inner cavity of the limiting shell. The anti-cracking performance and the anti-freezing performance of the sealing strip body can be improved through the protective layer, the high-temperature resistance and the corrosion resistance of the sealing strip body are improved through the reinforcing layer, the oxidation resistance and the abrasion resistance of the sealing strip body are improved through the protective layer, and the sealing strip body is prevented from being abraded due to opening and closing of doors and windows; therefore, the sealing and dustproof performance of the sealing strip body is improved, and the problems that an existing sealing strip is usually installed in a door and window frame, due to the fact that a door and a window are opened and closed frequently, the sealing strip is prone to being abraded, and the sealing and dustproof performance of the sealing strip becomes poor are solved. And the durability and the service life of the sealing strip are improved and prolonged by utilizing good flexibility and weather resistance of the material.

The invention belongs to the technical field of high polymer materials, and particularly relates to a high-strength plastic film and a preparation method thereof. The high-strength plastic film is prepared from the following raw materials in parts by weight: 80 to 90 parts of polylactic acid, 5 to 10 parts of polyurethane resin, 2 to 6 parts of flame-retardant modified halloysite, 2 to 6 parts of antioxidant modified halloysite, 0.5 to 2 parts of silane coupling agent and 1 to 3 parts of plasticizer. According to the invention, the halloysite is subjected to flame-retardant modification and antioxidant modification and is added into a PLA matrix, so that the halloysite can be used as an inorganic filler to reinforce the rigidity and strength of the PLA matrix, and also has flame-retardant and antioxidant dual functions; meanwhile, the tubular structure of the halloysite nanotube can form a zigzag path in a PLA matrix, so that diffusion of water vapor and oxygen is delayed, the water vapor permeation amount and the oxygen permeation coefficient are reduced, and the halloysite nanotube can be applied to food packaging to prolong the fresh-keeping period of food.

The invention belongs to the technical field of data center cooling, and discloses a narrow fraction mineral base oil single-phase immersed cooling liquid and a preparation method thereof in order to solve the problem of poor stability of the cooling liquid, and the preparation method comprises the following steps: preparing a dispersant; the preparation method comprises the following steps: adding an antioxidant and nano heat-conducting particles into narrow fraction mineral base oil, and stirring to obtain a product a; heating narrow fraction mineral base oil, adding a dispersing agent and an anti-rust agent, and stirring to obtain a product b; and finally mixing and stirring the product a and the product b. The cooling liquid provided by the invention takes the narrow fraction mineral base oil as a matrix, solves the problems of poor heat dissipation, weak oxidation resistance and low flash point of the traditional mineral oil through the synergistic effect of all the components, has low viscosity, high flash point, excellent electrical insulation and thermal conductivity, good compatibility and low volatilization rate, is suitable for immersed cooling systems such as a large computing power data center, and has wide application prospects. The high-efficiency heat dissipation and safe operation requirements of high-heat-density equipment can be met, the preparation process is simple, the cost is low, and the industrial application value is good.

The invention relates to a high-temperature-resistant reusable self-aligning roller bearing, and belongs to the technical field of bearings. A roller is arranged between an inner ring and an outer ring, and the inner ring is made of Al0. 5CrCoFeW0. 5Ni high-entropy alloy; the oxidation resistance, the strength, the stability and the wear resistance during working are met; the outer side surface of the inner ring is subjected to ion implantation modification to form a modified layer of the inner ring; the TiAlN coating reduces energy loss, and the first Ag coating is used for conducting heat and reducing oxidation loss; the outer ring is made of an Al < 0.5 > CoCrFeV < 0.5 > Ni high-entropy alloy; the high bearing capacity, the wear resistance, the fatigue resistance, the dimensional stability and the corrosion resistance in the working process are met; the modified layer on the inner side surface of the outer ring is used for improving the surface hardness and enhancing the wear resistance; the CrAlN coating is used for improving oxidation resistance, and the second Ag coating is used for conducting heat and reducing oxidation loss; the roller is made of an AlCoCrFeNi2. 1Nb0. 6 high-entropy alloy; a lubricating structure on the surface of the roller comprises an annular groove and graphite fluoride; a lubricating film is formed when the raceway and the roller rub each other, and the integrity of the lubricating film is maintained.

The invention relates to the technical field of composite metal materials, in particular to a silver-coated graphene copper composite material and a preparation method thereof, and aims at solving the problems that traditional silver-coated copper powder is high in silver consumption, copper is oxidized due to the fact that a silver layer is prone to being damaged, and conductivity is insufficient. The method comprises the steps that a graphene coating layer is formed on a copper powder substrate in situ through chemical vapor deposition, and graphene copper powder is obtained; performing etching treatment on the graphene copper powder to controllably expose part of the copper substrate so as to form anchoring points for silver ion deposition; carrying out reduction treatment on the etched graphene copper powder so as to ensure that an anchoring site has chemical activity; in a reductive liquid phase environment, enabling a chemical silver plating solution to react with the graphene copper powder subjected to reduction treatment, and guiding silver ion deposition by utilizing an anchoring point, so as to form a silver coating layer on the surface of the graphene coating layer; and separating and drying the reacted system to obtain the silver-coated graphene copper composite material. The material is better in oxidation resistance and conductivity, and the process is free of waste liquid.

According to the silicon carbide / diamond multi-layer composite film and the preparation method thereof, a polycrystalline silicon carbide matrix in the multi-layer composite film is a bottom layer, and the multi-layer composite film has high strength, high rigidity, high heat conductivity and oxidation resistance; the components of the gradient SiC-C transition layer gradually change from pure SiC to rich C-SiC and then to diamond-like carbon, and the gradient SiC-C transition layer is used for slowly releasing thermal stress and enhancing binding force; the nanocrystalline diamond is used as the top layer and has high hardness, low friction coefficient, particle scouring resistance and high infrared transmittance; the silicon carbide / diamond multi-layer composite film is obtained through a chemical vapor deposition method, the process is mature, and the silicon carbide / diamond multi-layer composite film has good heat conduction performance and infrared transmittance and is suitable for infrared guidance systems with extremely severe working environments, such as optical materials of fairings, optical windows and the like.

The present disclosure provides a high-temperature resistant nano-copper produced by laser direct writing, a preparation method and an application thereof. The high-temperature resistant nano-copper exhibits excellent oxidation resistance, thermal stability and superior conductivity. In this disclosure, the preparation is simple, and the nano-copper oxide ink can be stored for extended periods without being affected by oxidation. It is suitable for various manufacturing processes including printing, coating, and other similar methods. Moreover, based on laser direct writing, the processing efficiency is high, enabling the one-step integration of multi-performance of the high-temperature resistant nano-copper. The high-temperature resistant nano-copper described in the present disclosure can be used as an interconnection circuit in an integrated sensor system based on all-laser in-situ direct writing, and can be widely applied in fields of aerospace, automobile, electronics, etc.

The invention discloses a high-flame-retardant temperature-resistant corrosion-resistant optical fiber composite cable and a preparation method thereof, and belongs to the technical field of cable manufacturing, and the high-flame-retardant temperature-resistant corrosion-resistant optical fiber composite cable sequentially comprises an optical fiber unit, a conductor layer, an insulating layer, a shielding layer, a corrosion-resistant layer and a sheath layer from inside to outside. The optical fiber unit adopts a ceramic silicone rubber buffer layer; the conductor layer is a nickel-plated copper alloy stranded wire, and the oxidation resistance is enhanced through nano titanium dioxide sol treatment; the insulating layer is of a three-layer co-extrusion structure; the shielding layer adopts an aluminum-plastic composite belt and tinned copper wire braided composite structure; the anti-corrosion layer is a polytetrafluoroethylene film subjected to plasma treatment; the sheath layer is made of two-component ceramic silicone rubber, is flexible after being vulcanized at normal temperature, and is converted into a ceramic body at high temperature. According to the optical fiber composite cable, through the collaborative design of a multi-layer structure, the performance of excellent continuous use stability, high salt mist environment corrosion resistance and the like is achieved, the optical fiber composite cable is suitable for high-temperature, corrosion, fire and other severe environments, and the safety and durability of the composite cable are remarkably improved.

The invention belongs to the field of cutting tool production and manufacturing, and particularly relates to a coated tool suitable for titanium alloy machining and a preparation method thereof.The coated tool sequentially comprises a toughening matrix, a CrN coating, a Cr-B-N coating, a CrB2 / CraAlbNc coating and a (CrxAlyBz) N coating from inside to outside, the CrB2 / CraAlbNc coating is formed by circularly stacking CrB2 sublayer / CraAlbNc sublayer composite structure units, the CrB2 sublayer / CraAlbNc sublayer composite structure unit comprises a CrB2 sublayer and a CraAlbNc sublayer, the number of cycles is 1-4, and the CrN coating, the Cr-B-N coating, the CrB2 / CraAlbNc coating and the (CrxAlyBz) N coating are all prepared through a chemical vapor deposition method. According to the method, a matrix toughening process is optimized and combined with a multi-layer composite coating which is prepared by adopting CVD and has specific components, so that the binding force, hardness, wear resistance, high-temperature oxidation resistance and bonding resistance of the coating and a matrix are remarkably improved, and the problems that a tool is prone to oxidation, bonding wear, tipping and the like in the titanium alloy machining process are effectively solved.

The invention relates to the technical field of energy storage safety, and particularly discloses wide-temperature-range flame-retardant cooling liquid, a preparation method of the wide-temperature-range flame-retardant cooling liquid, an immersed energy storage device, a data center and electric equipment.The wide-temperature-range flame-retardant cooling liquid is introduced into the flame-retardant cooling liquid, the modifier can improve the wide-temperature-range performance of the flame-retardant cooling liquid, and the flame-retardant performance of the flame-retardant cooling liquid is improved; good applicability in extremely cold and high-temperature environments is ensured; the modifier has good breakdown resistance and thermal oxidation stability, so that the insulating property and oxidation resistance of the flame-retardant cooling liquid can be further improved; in addition, the modifier contains phosphorus element which can play a synergistic flame-retardant role with flame-retardant elements in the flame retardant, so that the flame-retardant property of the flame-retardant cooling liquid is further enhanced; meanwhile, the modifier also has good compatibility with other components in the flame-retardant cooling liquid, so that the cooling liquid can be uniformly dispersed, and the problem that the insulating property, the flame-retardant property and the wide temperature range property become poor due to system layering caused by poor compatibility is avoided.

The invention belongs to the technical field of preparation of low-carbon magnesia carbon bricks, and particularly relates to a low-carbon magnesia carbon brick for a ladle slag line and a preparation method of the low-carbon magnesia carbon brick. According to the low-carbon magnesia carbon brick for the steel ladle slag line, 98 # fused magnesia with the particle size being larger than or equal to 3 mm and smaller than 5 mm, larger than or equal to 2 mm and smaller than 3 mm and larger than or equal to 1 mm and smaller than 2 mm serves as coarse aggregate, 98 # fused magnesia with the particle size being larger than or equal to 0.088 mm and smaller than 1 mm serves as medium aggregate, a mixture of 98 # fused magnesia with the particle size being smaller than 0.088 mm, fused magnesia-calcium sand and zircon sand serves as powder, crystalline flake graphite and a phenolic resin binding agent are added, and the low-carbon magnesia carbon brick for the steel ladle slag line is obtained through sintering. According to the low-carbon magnesia carbon brick for the steel ladle slag line, calcium hexaluminate, magnesium silicide, chromium carbide and a rare earth compound are used as additives, and the raw materials are mutually matched and have a synergistic effect, so that the prepared low-carbon magnesia carbon brick for the steel ladle slag line has excellent mechanical strength, oxidation resistance and slag resistance.

The present application belongs to the technical field of copper foil oxidation resistance detection and analysis, and discloses a copper foil oxidation resistance detection method and system based on glossiness analysis, which comprises the following steps: obtaining a glossiness attenuation standard curve of copper foil samples with different oxidation resistance grades; dividing the glossiness attenuation standard curve according to the inflection point position to obtain different oxidation stages and glossiness change ranges; obtaining a to-be-detected glossiness attenuation curve of the to-be-detected copper foil; obtaining a glossiness attenuation standard curve with the highest similarity to the to-be-detected glossiness attenuation curve among all the glossiness attenuation standard curves, and calculating the first defect influence degree of the to-be-detected copper foil at different oxidation stages according to the glossiness change range of the to-be-detected glossiness attenuation curve at the same oxidation stage; correcting the first defect influence degree to obtain the second defect influence degree, so as to calculate the final similarity between the to-be-detected glossiness attenuation curve and all the glossiness attenuation standard curves; and dividing the oxidation resistance grade of the to-be-detected copper foil according to the final similarity.

The invention relates to metallurgy, and more particularly to a sheet material made of titanium alloys that are resistant to high heat and oxidation and exhibit structural stability under prolonged operational exposure to temperatures in a range of up to 800° C. and can be used for manufacturing components of a vehicle exhaust system. The present titanium alloy sheet material for the manufacture of components contains: 1.5-3.0 wt % aluminium, 0.1-0.5 wt % molybdenum, 0.1-0.6 wt % silicon, not more than 0.2 wt % iron, not more than 0.15 wt % oxygen, not more than 0.1 wt % carbon, not more than 0.03 wt % nitrogen, not more than 0.015 wt % hydrogen, and the balance titanium. The sheet material has high creep resistance and oxidation resistance values, as well as a stable structure under prolonged operational exposure to temperatures in a range of up to 800° C. The material is suitable for cold forming.

The invention discloses a magnesia-carbon-based refractory brick and a preparation method thereof, relates to the technical field of display optical films, and belongs to the technical field of surface modification of refractory materials. A sacrificial reaction layer and a transition bonding layer are prepared on the surface of the magnesia carbon brick through pretreatment of a base brick, preparation of coating slurry, gradient coating, curing and heat treatment; wherein the sacrificial reaction layer can realize high-temperature instant cooling through a controllable endothermic reaction, and meanwhile, a reaction product forms a compact protective layer to block slag permeation; the preparation process is simple and controllable, the prepared coating is firmly combined with the magnesia carbon brick body, the high-temperature oxidation resistance and the slag penetration resistance of the magnesia carbon brick can be remarkably improved, the service life of the magnesia carbon brick can be remarkably prolonged, and the magnesia carbon brick has the advantages of low cost and high practicability. The method is suitable for magnesia carbon brick protection under severe working conditions of high-temperature metallurgical furnaces and kilns and the like.

The invention discloses a compound and application thereof. The present specification provides a compound which exhibits excellent heat resistance and oxidation resistance, thereby stably maintaining light absorption characteristics even under high-temperature or high-humidity conditions. The present specification also provides a resin film which ensures desired optical characteristics by applying the compound. The present specification also provides uses of the compounds.

It is an aim of the present disclosure to provide a ferritic stainless steel with excellent oxidation resistance and workability. The ferritic stainless steel of the present disclosure includes a chemical composition containing, in mass %, predetermined amounts of Cr, Al, S, C, N, O, and Nb, with the balance being Fe and inevitable impurities, and content ratios of Al and Cr satisfy expressions (1) and (2): 2Al+Cr≤41 (1), and Al+Cr≥23 (2).

Provided is a stainless steel having excellent oxidation resistance, Cr poisoning resistance, and electrical conductivity not only in the use environment of SOFC, but also in the use environment of SOEC. In the present invention, the component composition is appropriately controlled, in particular, 0.60-1.50 mass% of Al, 0.20-0.45 mass% of Nb, 20.0-30.0 mass% of Cr, and 0.05-0.50 mass% of Si, and the relationship of the following formulae (1) and (2): 0.03 * [Cr] + [Al] < = 2.20 (1) and 0.44 * [Si] + [Al] < = 1.52 (2) are satisfied.

The object is to provide a Fe-Ni-Cr alloy for a sheathed heater jacket pipe which is excellent in oxidation resistance, corrosion resistance, and weldability, and which can be used in a humid high-temperature environment. The alloy for solving the object is a Fe-Ni-Cr alloy consisting of, in mass%, C: 0.001 to 0.050%, Si: 0.18 to 1.00%, Mn: 0.20 to 0.80%, P: 0.030% or less, S: 0.0001 to 0.0020%, Ni: 12 to 21%, Cr: 18 to 24%, Mo: 0.20 to 1.50%, Cu: 0.30% or less, Al: 0.10 to 0.70%, Ti: 0.10 to 0.70%, N: 0.002 to 0.015%, B: 0.0001 to 0.0010%, O: 0.0002 to 0.0030%, Ca: 0.002% or less, REM: 0.0010 to 0.0150% of one or two or more of La, Ce, and Y, and the balance of Fe and inevitable impurities, and satisfies formulae 1 and 2. 0.575 x Ni + 1.25 x Cr + 3.43 x Mo - 39 x P - 5.3 x Al - 64 1 x REM - 1018 x O ≥ 20.0 … (Formula 1). 1.5 x Mn + 41.3 x Si + 1469 x S - 1.67 x Al - 1.34 x Ti - 150 x O - 620 x REM ≥ 5.0 … (Formula 2).

The invention provides modified zirconium boride ceramic, a preparation method and application of the modified zirconium boride ceramic in electrolytic aluminum, and belongs to the technical field of ceramic. The preparation method comprises the following steps: preparing zirconium dioxide sol, preparing a reinforcing phase, coating and sintering. The step of preparing the zirconium dioxide sol comprises the following steps: adding a rare earth solution into a zirconium source solution, controlling the adding rate of the rare earth solution to be 1.5-2.0 g / min, stirring while adding, stirring at 42-45 DEG C for 30-35 min, stirring at 60-63 DEG C for 40-50 min, adjusting the pH to 3.2-3.5, adding polyethylene glycol 2000 after aging, and stirring for 50-60 min to obtain the zirconium dioxide sol; the prepared modified zirconium boride ceramic is high in strength, excellent in high-temperature oxidation resistance and thermal shock resistance and good in corrosion resistance, and the stability of the electrolysis process can be effectively guaranteed.

The application belongs to the technical field of carbon / ceramic composite material preparation, and provides an impregnation sealing liquid for carbon / ceramic friction discs, an impregnation sealing method, a densified carbon / ceramic friction disc and application thereof. The impregnation sealing liquid comprises 2-5% of an interface reinforcing metal component, 3-6% of a friction and wear resistant ceramic component, 2-5% of a metal oxide component and the balance of a polymer. The polymer comprises liquid polycarbosilane and liquid polyborosilazane, and the mass ratio of the liquid polycarbosilane to the liquid polyborosilazane is 7-9:1-3. The interface reinforcing metal component comprises one or more of titanium powder, chromium powder, nickel powder, cobalt powder and molybdenum powder. The friction and wear resistant ceramic component comprises one or more of silicon carbide, zirconium boride, boron carbide and zirconium carbide. The metal oxide component comprises one or more of cerium oxide, yttrium oxide and lanthanum oxide. The impregnation sealing liquid can realize the triple improvement of the interface bonding force, the friction stability and the high-temperature oxidation resistance of the carbon / ceramic friction disc.

The invention provides a high-strength corrosion-resistant iron-chromium-aluminum alloy and a preparation method thereof, and relates to the technical field of iron-chromium-aluminum alloys, the high-strength corrosion-resistant iron-chromium-aluminum alloy comprises, by mass, 19-25% of Cr, 8.5-11% of Al, 0.3-0.8% of Nb, 0.1-0.4% of Ti, 0.2-0.6% of Si and the balance Fe and limited impurities, a dispersion strengthening phase is formed by compositely adding Nb and Ti, and the oxidation resistance is improved by synergistically optimizing the proportion of Cr and Al; the preparation method comprises the steps of raw material pretreatment, vacuum melting and refining, directional solidification, homogenizing annealing, hot working and solid solution-aging heat treatment, and process parameters are accurate and controllable. By optimizing the proportion of Cr and Al and compositely adding Nb and Ti, the pain point that strength and corrosion resistance are difficult to cooperate is solved; and meanwhile, homogenizing annealing, directional solidification optimization and heat treatment parameters are added in the process, segregation and internal stress are eliminated, the performance of the prepared iron-chromium-aluminum alloy comprehensively exceeds that of a conventional iron-chromium-aluminum alloy, and the prepared iron-chromium-aluminum alloy is adaptive to high-end scenes and high in stability.

The invention belongs to the technical field of chemical tin plating, and particularly relates to a micro-nano powder surface tin plating method which comprises the following steps: pretreating powder, adding main salt, a reducing agent, a coordination agent and an antioxidant into water, and stirring until the main salt, the reducing agent, the coordination agent and the antioxidant are completely dissolved; and the pretreated powder is added into the cylinder opening liquid to be subjected to a reaction, when the surface of the solution is subjected to the reaction, the supplementing liquid is added, stirring continues to be conducted till the reaction is completed, and the micro-nano powder with the tin-plated surface is obtained. According to the method for plating tin on the surface of the micro-nano powder, tin is plated on the surface of the micro-nano split body, so that the surface energy of the material can be effectively reduced, the material can be more easily infiltrated and combined with welding flux in the welding process, the welding performance of the material is remarkably improved, and the material is high in oxidation resistance, high in conductivity, high in dispersity and high in corrosion resistance. The whole process is simple, stable and suitable for large-scale production and application.

The application provides a preparation method of high-oxidation-resistance stainless steel for brake disc, and the process flow of the preparation method is as follows: molten steel obtained by refining general carbon molten iron is continuously cast, hot-rolled, covered and retreated, and pickled; the composition of the molten steel is controlled as follows: Mn 0.3-1.0%, Ni 0.1-0.3%, and Cu 0.10-0.25%; meanwhile, four passes of dephosphorization are simultaneously conducted in the hot-rolling process; meanwhile, in the covering and retreating process, pure nitrogen is selected as the protective gas of the covering and retreating process, the heating of the covering and retreating is controlled to 640 DEG C, and after a certain holding time, the heating is continued, the time of the high-temperature holding section is shortened, and the temperature after cooling is reduced, so that after the pickling, a dense passivation film is left on the surface of the stainless steel product after the removal of the oxide scale, the oxidation resistance of the stainless steel product is improved, and the proportion of the yellow material after quenching in the process of processing the stainless steel product into brake disc is significantly improved.

The application provides an extreme pressure anti-wear agent, a preparation method thereof and heavy load vehicle gear oil, and belongs to the technical field of extreme pressure anti-wear additives. The application provides an extreme pressure anti-wear agent with a chemical structure shown in formula I or formula II. Through molecular design, the prepared extreme pressure anti-wear agent has excellent high-temperature oxidation resistance, can reduce the friction coefficient of the surface of a friction pair, and in the friction process, nitrogen elements and boron elements in the borate ester diffuse from the friction surface to the matrix to form a permeation layer, improve the wear resistance of the surface of the material, play an extreme pressure anti-wear role, make the heavy load vehicle gear oil have better load-carrying capacity and extreme pressure resistance, and thus play an energy-saving and consumption-reducing role.

The invention discloses a corrugated shaping extrusion composite pipeline material and a preparation method thereof, and relates to the technical field of pipeline materials. The material is composed of polypropylene, high density polyethylene, a modified anti-aging agent and a color master batch, the modified anti-aging agent is prepared through condensation polymerization of an amido-containing monomer, formaldehyde, a hydrolyzable metal oxide monomer, a siloxy-containing monomer, an antioxidant and an ultraviolet absorbent in proportion, a microcapsule structure is formed, and slow release and long-acting protection of the antioxidant are achieved. According to the structure, the compatibility of an anti-aging agent and a matrix is effectively improved, the thermo-oxidative aging resistance of the material is enhanced, and the processing fluidity and the mechanical property are improved. The prepared corrugated pipe has excellent oxidation resistance, weather resistance and mechanical strength, and the service life is remarkably prolonged.

The utility model provides a kind of high-temperature-resistant long-life ball bearing retainer, it is related to bearing retainer technical field, and it includes: hold frame body;The retainer body is annular structure, and ball hole is arranged in annular array shape on the inner wall of retainer body;Annular array shape is arranged in the through hole of the outer wall of retainer body, and the through hole is circular hole structure, and the through hole arranged in annular array shape is jointly composed of the heat dissipation structure of retainer body.Utilize nickel-based alloy high melting point (1300 DEG C above) and strong oxidation resistance, so that retainer is not easy to heat softening or oxidation corrosion failure under high temperature working condition (such as industrial kiln, aeroengine), directly prolongs the service life under high temperature environment;Through type circular through hole forms three-dimensional heat dissipation channel, cooperates the forced convection of lubricating medium (oil / gas), and internal heat is quickly taken away.For example in high-speed motor, airflow passes through through hole can make retainer temperature reduce 20%~30%, avoid local overheating to cause material failure.