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1498 results about "Surface oxide" patented technology

Oxide Surface. Surface oxides are formed in three stages: (1) oxygen chemisorption, (2) formation of the oxide layer, and (3) thickening of the oxide (9).

Technological process for producing super-thick plate

The invention relates to a process for producing an ultra-thick plate and belongs to the field of rolling and producing an ultra-thick steel plate in the metallurgical industry. The invention mainly overcome the defect of producing the ultra-thick steel plate by a traditional model casting manufacturing blank and an electro-slag remelting manufacturing blank. The method comprises the following steps: cutting and fixing lengths of the blanks, mechanically conditioning the blanks (eliminating, leveling and cleaning a single-surface oxide layer of a casting blank with a milling machine, a planer or a shot blast); clamping an assembly (relatively superposing the cleaning surfaces of the two blanks after processing, placing the two blanks oppositely and clamping the blanks); mounting the blanks in a vacuum chamber of an electronic beam welding machine for purpose of vacuuming; sewing the assembly on the electronic beam welding seal edge, heating the assembly in a furnace and rolling the assembly through temperature control; and then producing the ultra-thick steel plate. Compared with the traditional electro-slag remelting production process, the process has the advantages of high production efficiency, reduced electric power consumption, less investment of production devices and low production cost. Compared with the traditional die casting production process, the process solves the problem of segregation and looseness of a large-scale die casting ingot center part; the finished product ratio is high; and the finished product ratio of blank assembly is over 90 %.
Owner:SHANDONG IRON & STEEL CO LTD

Composite machining process for inner and outer rings of narrow-series thin-walled high-precision conical thin-walled bearings

ActiveCN102310310AImprove forging production efficiencyImprove pass rateEngineeringRejection rate
The invention discloses a composite machining process for inner and outer rings of narrow-series thin-walled high-precision conical thin-walled bearings, belongs to the technical field of forging, turning, heating and grinding machining of the inner and outer rings of bearing components, and mainly solves the problems of low production efficiency and high rejection rate in a conventional machining method. The composite machining process is mainly characterized by comprising the following steps of: (1) cutting bar stock into straight material sections; (2) after heating, forming a single-forged inner ring and double combined-forged outer rings by using a pressing machine; (3) spheroidizing and annealing; (4) performing shot blasting to remove surface oxide scales; (5) after cutting the double outer rings, performing rough turning and soft grinding; (6) performing additional tempering; (7) performing the soft grinding on the outside diameter of the outer rings, and performing finish turning and rolling; (8) performing heat treatment in quenching and tempering furnaces, and performing shot blasting again; and (9) performing rough grinding machining, the additional tempering, finish grinding machining, super-finishing, cleaning and assembling. The composite machining process has the characteristics of great improvement on product qualification rate and production efficiency, and suitability for batch production on the premise of no increase of equipment investment, and is mainly used for machining the inner and outer rings of the narrow-series thin-walled high-precision conical thin-walled bearings.
Owner:XIANGYANG AUTOMOBILE BEARING CO LTD

Supercapacitor electrode material preparation method based on three-dimensional graphene

A supercapacitor electrode material preparation method based on three-dimensional graphene comprises the steps that foamed nickel with surface oxide removed is steeped in oxidized graphene dispersion liquid, the oxidized graphene is made to be deposited on the foamed nickel, and then the foamed nickel is aired to remove moisture at room temperature after being taken out. The steeping method comprises the steps that the foamed nickel is steeped in the oxidized graphene dispersion liquid with the concentration of 0.5mg/ml-10mg/ml, and is aired after ultrasonic processing is carried out for 1-30 minutes; the quality of the oxidized graphene deposited on the foamed nickel is controlled through the concentration of the oxidized graphene and steeping times, and the steeping times is 1 to 30 times. The prepared oxidized graphene/foamed nickel composite electrodes are reduced through ascorbic acid, then a part of metal nickel is etched and removed by using a chemical etching method or a part of the metal nickel is simultaneously reduced, etched and removed through hydroiodic acid to obtain graphene/foamed nickel composite electrodes. The supercapacitor electrode material preparation method based on the three-dimensional graphene is simple, easy to operate, capable of improving the performance of supercapacitors and reducing manufacturing cost, and suitable for mass production.
Owner:NANJING UNIV

Ion beam process for deposition of highly abrasion-resistant coatings

An ion beam deposition method is provided for manufacturing a coated substrate with improved abrasion resistance, and improved lifetime. According to the method, the substrate is first chemically cleaned to remove contaminants. In the second step, the substrate is inserted into a vacuum chamber, and the air in said chamber is evacuated. In the third step, the substrate surface is bombarded with energetic ions to assist in the removal of residual hydrocarbons and surface oxides, and to activate the surface. <DEL-S DATE="20010724" ID="DEL-S-00001">Alter<DEL-E ID="DEL-S-00001"> <INS-S DATE="20010724" ID="INS-S-00001">After <INS-E ID="INS-S-00001">the substrate surface has been sputter-etched, a protective, abrasion-resistant coating is deposited by ion beam deposition. The ion beam-deposited coating may contain one or more layers. Once the chosen thickness of the coating has been achieved, the deposition process on the substrates is terminated, the vacuum chamber pressure is increased to atmospheric pressure, and the coated substrate products having improved abrasion-resistance are removed from the vacuum chamber. The coated products of this invention have utility as plastic sunglass lenses, ophthalmic lenses, bar codes scanner windows, and industrial wear parts that must be protected from scratches and abrasion.
Owner:MORGAN ADVANCED CERAMICS

Method for forming fine copper particle sintered product type of electric conductor having fine shape, method for forming fine copper wiring and thin copper film using said method

The present invention provides a process for forming a copper fine particle sintered product type of a fine-shaped electric conductor showing superior electroconductivity, which comprises steps of drawing a fine pattern with the use of a dispersion containing the copper fine particles having a surface oxide film layer, conducting a treatment for reducing the copper fine particles with the surface oxide film layer or copper oxide fine particles included in the pattern at a comparatively low temperature, and baking the resultant copper fine particles. Specifically, the process carries out the processes of; applying a dispersion containing the copper fine particles having the surface oxide film layer thereon or the copper oxide fine particles with an average particle diameter of 10 μm or smaller onto a substrate; and then performing a series of the heat treatment steps of heating the particles in the coated layer at temperature of 350° C. or lower under an atmosphere containing a vapor and a gas of a compound having reducibility to reduce the oxide film by a reduction reaction which used the compound having reducibility as a reducing agent, subsequently repeating a heat treatment combining an oxidizing treatment of a short time with a re-reducing treatment, and sintering the resultant copper fine particles with each other to form a layer of the sintered product.
Owner:HARIMA CHEM INC

Controlled plating on reactive metals

A direct displacement plating process provides a uniform, adherent coating of a relatively stable metal (e.g., nickel) on a highly reactive metal (e.g., aluminum) that is normally covered with a recalcitrant oxide layer. The displacement reaction proceeds, preferably in a nonaqueous solvent, as the oxide layer is dissolved by a fluoride activator. Halide anions are used to provide high solubility, to serve as an anhydrous source of stable metal ions, and to control the rate of the displacement reaction. A low concentration of activator species and little or no solution agitation are used to cause depletion of the activator species within pores in the surface oxide so that attack of the reactive metal substrate is minimized. Used in conjunction with electroless nickel deposition to thicken the displacement coating, this process can be used to render aluminum pads on IC chips solderable without the need for expensive masks and vacuum deposition operations. Such coatings can also be used to preserve or restore wire bondability, or for corrosion protection of aluminum and other reactive structural metals and alloys. A thin layer of immersion gold can be used to protect the thickened coating from oxidation. The solderable aluminum IC chip pads provide the basis for a maskless bumping process for flip chip attachment.
Owner:CALLAHAN CELLULAR L L C

A Ni-Co-Cr-Al-W-Ta-Mo based high-entropy high-temperature alloy and a preparation method thereof

A Ni-Co-Cr-Al-W-Ta-Mo based high-entropy high-temperature alloy and a preparation method thereof are disclosed and belong to the field of high-entropy alloys. The chemical composition of the alloy isNiCoCr<c>Al<d>W<e>Ta<f>Mo<g>Rx, wherein R is one or two of Re and Ru. The method includes removing surface oxide skin of raw material metals by utilizing a mechanical-chemical combined process;cleaning the raw material metals by utilizing industrial ethanol and utilizing ultrasonic shaking; smelting the alloy by using a vacuum arc furnace; charging industrial argon when the vacuum degree is5*10<-2> Pa; after a master alloy is uniformly melted, injecting the alloy into a water cooling copper mould by utilizing a vacuum casting or suction casting device to obtain a high-entropy alloy rod; performing solution treatment at 1250 DEG C for 2-6 h; and then performing ageing heat treatment at 900 DEG C and 950 DEG C for 4-50 h. The disclosed alloy has excellent room-temperature and high-temperature strength, excellent resistance to high-temperature oxidation, and excellent creeping resistance, fatigue resistance and long-term tissue stability, is suitable for manufacturing hot end elements, such as blades and turbine discs, of aero-engines and gas turbines, and is used for engineering machines, special vehicles, coal, ore, railroads, and the like.
Owner:UNIV OF SCI & TECH BEIJING
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