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126results about How to "prevent oxidation" patented technology

Flame tube head assembly brazing method

The invention discloses a flame tube head assembly brazing method and belongs to the technical field of aero-engine part manufacturing. In a brazing method of a traditional flame tube head assembly, an assembly substrate at a positioning welding point is oxidized due to the fact that a tube front section and a splash pan are positioned through argon arc welding, so that during brazing, brazing filter metal cannot moisten the substrate at the positioning welding point, the brazing seam is not continuous, and a design requirement of a continuous brazing seam cannot be achieved, and after brazing, a cold air hole is blocked by the brazing filter metal, the brazed rate between a sleeve and a swirler cannot achieve a design requirement of more than 80%. The flame tube head assembly brazing method has the advantages that the assembly substrate at the positioning welding point is avoided from being oxidized due to positioning through energy storage spot welding, enabling the paste brazing filter metal to moisten the substrate at the positioning welding point and guaranteeing the continuous brazing seam design requirement; enabling a to-be-welded position on the internal side of the sleeve to satisfy the brazed rate requirement and avoiding the brazing filter metal blocking the cold air hole during the brazing process due to the fact that check soldering flux pains inside the cold air hole; the operability is strong and production costs are obviously reduced.
Owner:SHENYANG LIMING AERO-ENGINE GROUP CORPORATION

High-stability recyclable surface-enhanced Raman substrate and preparation method

InactiveCN104404512AIsolated from the outside environmentprevent oxidation
The invention realtes to a high-stability recyclable surface-enhanced Raman substrate and a preparation method and belongs to the technical field of trace-amount organic substance detection. In the method, a silver nanorod array thin film is prepared through an inclined growing method and then an amorphous-state titanium oxide thin film is uniformly deposited onto a surface of the silver nanorod array thin film through an atomic layer deposition method to obtain a silver-at-titanium oxide composite nanorod array thin film as the surface-enhanced Raman substrate. By means of the substrate, a surface-enhanced Raman signal is free from being attenuated greatly due to the ultrathin titanium oxide layer. The substrate is excellent in enhancement effect. Meanwhile, the titanium oxide thin film enables silver nanorods to be isolated from external environment so that the silver nanorods are enhanced in anti-oxidizing and anti-vulcanizing performance, thereby greatly enhancing stability of the substrate. The titanium oxide, as a photocatalytic material, can catalytically decomposing organic substances adsorbed on the surface of the substrate with combination of an ultraviolet light. The substrate, after being irradiated by the ultraviolet light, can be recycled as a clean substrate. The substrate has a wide application prospect in the field of the trace-amount organic substance detection.
Owner:TSINGHUA UNIV

Melting and iron-smelting device of heat storage type electric arc furnace

The invention provides a melting and iron-smelting device of a heat storage type electric arc furnace, which comprises a furnace body of the electric arc furnace and matched equipment, at least one pair of combustion chambers and at least one pair of heat storage devices, the device is further provided with at least one pair of gasification boxes which are arranged between the furnace body of theelectric arc furnace and the combustion chambers, and at least one layer of coal grid is arranged in each gasification box. Each gasification box is provided with a bypass, and valves are arranged onan outlet, an inlet and the bypass of each gasification box. The device aims at preventing reduced substances at the gas inlet from being oxidized after that circulating gas or air enters the electricarc surface; oxygen-containing gas preheated by the heat storage devices, in particular to the air, firstly enters the combustion chambers to be mixed with fuel sprayed into the combustion chambers for burning before entering the electric arc furnace, and high-temperature flue gas is exhausted from the combustion chambers and then enters the gasification boxes to carry out gasification reaction with coal in the coal grids for generating CO, thereby forming a reducing atmosphere, optimizing the environment of melting, reducing and iron-smelting of the electric arc furnace, being conductive tothe reducing process of the reduced substances, improving the quality of reduced iron products and reducing environmental pollution.
Owner:SHIJIAZHUANG XINHUA IND FURNACE CO LTD

Array substrate, manufacturing method thereof and display device

The invention provides an array substrate, a manufacturing method thereof and a display device. The manufacturing method comprises the steps of forming a first conducting layer and a second conductinglayer in a first area and a second area of a substrate, binding pins which are located in the first area and used for being electrically connected with a driving chip are formed, the second conducting layer is located on the side, away from the substrate, of the first conducting layer, and the first area and the second area are spaced; removing the second conductive layer in the second region, and forming a conductive electrode which is located in the second region and is used for being electrically connected with the light-emitting element through a connecting piece; wherein the adhesive force between the first conducting layer and the connecting piece is larger than that between the second conducting layer and the connecting piece, and the second conducting layer is used for preventingthe first conducting layer from being oxidized. The manufacturing method has the advantages that the manufacturing process is simplified, the oxidation resistance of the binding pin is improved, and the adhesive force between the connecting piece and the conductive electrode is improved, so that the light-emitting element is firmly fixed on the array substrate.
Owner:TCL CHINA STAR OPTOELECTRONICS TECH CO LTD

Preparation method for low oxygen content and high alloying nickel-based mother alloy and powder

ActiveCN106636702Aprevent oxidationreduce oxygen content
The invention discloses a preparation method for a low oxygen content and high alloying nickel-based mother alloy and powder and belongs to the field of powder metallurgy. The technological process of the preparation method includes the steps that firstly, a pure mother alloy ingot is prepared by means of duplex processes of vacuum smelting and electroslag remelting. In the process of vacuum smelting, a calcium oxide crucible is adopted, raw materials are pre-treated, carbon blocks are added in a refining stage for deoxidization, elements prone to the burning loss are supplemented at the end stage of smelting, and the mother alloy ingot in designed components is obtained. In the process of the electroslag smelting, by adjusting the shape, the depth, the viscosity and other parameters of a slag pond, the float-up condition of the nonmetallic inclusion is created, and the mother alloy is further purified. After the mother alloy ingot subjected to electroslag remelting is subjected to scaling, the mother alloy ingot is subjected to high-speed disk grinding breakage under the protective atmosphere, and the ultra-thin mother alloy powder is obtained. The particle size of the K418 mother alloy powder prepared through the method is smaller than 20 microns, the oxygen content is lower than 200 ppm, the sulfur content is lower than 20 ppm, after the alloy podwer is mixed with carbonyl nickel powder, sintering compacting at low temperature can be achieved, and the production cost and the process energy consumption of a high temperature alloy of the powder are greatly reduced.
Owner:UNIV OF SCI & TECH BEIJING

Extraction separation device for biopharmaceutical

InactiveCN110694298Aprevent oxidationExpand the mixing range
The invention discloses an extraction separation device for biopharmaceutical and belongs to the technical field of biopharmaceutical. The extraction separation device comprises a liquid allocation cabinet, a waste gas purification mechanism, a centrifugal mixing mechanism and a solid-liquid separation mechanism, wherein a discharge funnel communicating with the interior of the liquid allocation cabinet is arranged at the bottom of the liquid allocation cabinet; a discharge pipeline communicating with the interior of the discharge funnel is arranged on the discharge funnel; a liquid inlet pipeline is arranged at the upper section of the liquid allocation cabinet; a filtering net is arranged inside the liquid allocation cabinet; the solid-liquid separation mechanism comprises a push plate,a moving strip, an anti-plugging component and a discharge component; and the push plate is horizontally arranged at the bottom of the moving strip. The extraction separation device has the beneficialeffects that through the solid-liquid separation mechanism, solid-liquid separation can be achieved, mesh holes of a filtering net can be prevented from being blocked, an extraction liquid and a liquid can be sufficiently mixed through the centrifugal mixing mechanism, a gas can be conveyed into a purification cylinder through the waste gas purification mechanism under the action of a fan, and centralized treatment on the gas can be achieved.
Owner:陈龙刚

Online melting carbon fiber reinforced aluminum-magnesium composite plate cast rolling molding device and method

PendingCN109365531AImprove the bonding strength of the interfaceprevent oxidation
The invention belongs to the technical field of metal-based composite materials, and particularly relates to an online melting carbon fiber reinforced aluminum-magnesium composite plate cast rolling molding device and method. The technical problems that in an existing continuous fiber reinforced aluminum-magnesium composite plate technology, the technology is complex, molten metal is prone to being oxidized, the interfacial bonding strength is low, and the composite plate quality is poor are solved. The online melting carbon fiber reinforced aluminum-magnesium composite plate cast rolling molding device comprises a rolling mill system, an online heating system, a gas protecting system, a leather plate, a core plate and a reinforced carbon fiber cloth. The online melting carbon fiber reinforced aluminum-magnesium composite plate cast rolling molding device has the advantages that the process of preparing the fiber material reinforced metal-based composite plate through the cast rollingtechnology is short, and the interfacial bonding strength is high; the smelting and pouring links in a traditional cast rolling technology are replaced with online melting, and therefore oxidization caused by metal liquid transferring is avoided; and the structure is compact, the technology is stable, the temperature is easy to control, and the composite plate size precision is high.
Owner:TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Online solid solution heat treatment process for high-performance copper alloy strip

ActiveCN110541132Aavoid surface scratchesprevent oxidation
The invention discloses an online solid solution heat treatment process for a high-performance copper alloy strip. The online solid solution heat treatment process for the high-performance copper alloy strip is based on an online solid solution heat treatment device for the copper alloy strip. The copper alloy strip is unrolled from a coiled material and is heated, and then the heat preservation,the air cooling, the strip profile correction and other technological operations are performed, so that the continuous online solid solution treatment of the copper alloy strip is realized. The onlinesolid solution heat treatment process has the following five advantages: one. the feed-in speed of the copper alloy strip is synchronized with the rotating speeds of a synchronous roller sealing doorand a rewinding synchronous tensioning wheel to prevent the surface of the copper alloy strip from being scratched; two. the reducing gas protection is adopted to prevent oxidation of the surface ofthe strip; three. the strip is heated by stage, the temperature rises gradually and is uniform, the surface of the strip is free during cooling treatment, and therefore, the residual internal stress is small; four. the profile of the copper alloy strip is corrected by adopting a furnace front S-roller device, multiple sets of middle pinch rolls and a furnace rear S-roller device, so that the stripprofile of the finished product is flat; and five. the process has the characteristics of uniform cooling and fast speed, and the finished copper alloy strip has extremely high mechanical propertiesand consistency.
Owner:珠海大华新材料有限公司
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