32results about How to "Oxidation barrier" patented technology

The invention discloses a processing method for inhibiting browning of dried fruit slices. The processing method comprises the following steps: raw material pretreatment, plant colloid embedding, liquid nitrogen pre-cooling, low-temperature mixed gas quick freezing, low-temperature vacuum lyophilization, heat pump drying and packaging. According to the processing method, the shortcomings of the existing dried fruit slice processing method and the quality defect of a product are overcome; the processing time is further shortened, the energy consumption is reduced, the production efficiency is improved, browning of the dried fruit slices is effectively inhibited, the drying quality is high, the color, the fragrance, the shape, the biological activity and the nutritional components of the dried fruit slices are retained to the maximum extent, and the preservation time is long.

The invention discloses a GaAs (111) wafer cleaning method. The GaAs (111) wafer cleaning method comprises steps that, a GaAs (111) substrate is treated by an organic solvent to remove oil stain and organic matters on the surface; the GaAs (111) substrate is immersed in hydrogen peroxide, is then taken out, is cleaned by deionized water, is immersed in hydrochloric acid, is taken out and is cleaned by deionized water; the acquired GaAs (111) substrate is immersed in hydrogen peroxide, is cleaned by deionized water, is immersed in hydrochloric acid and is cleaned by deionized water for at least one time. According to the method, the surface of the GaAs (111) substrate is treated by the hydrogen peroxide to acquire a structured nature oxide layer and is then corroded by the hydrochloric acid, as the GaAs (111) surface is the structured nature oxide layer, GaAs defects with bad quality in the surface can be effectively removed, so oxide quantity and roughness of the GaAs surface can be greatly reduced. The cleaning method is employed in combination with an ammonium sulphide solution for passivation, so the clean GaAs surface can be prevented from being oxided by oxygen in the air for long time.

The invention discloses an anti-oxidation treatment technology before steel structure material heat treatment. The anti-oxidation treatment technology specifically comprises the following steps of (1)steel structure material pretreatment, (2) steel structure material roughening treatment, and (3) steel structure material surface spraying treatment. According to the anti-oxidation treatment technology, by processing a steel structure material, on the premise that the strength of the steel structure material meets the industrial requirement, the grain size of the steel structure material is increased as much as possible, the surface height of the steel structure material is made to be different, and accordingly, the surface roughness of the steel structure material is improved; then, spraying powder is sprayed onto the surface of the steel structure material, an anti-oxidation coating is formed, oxygen is stopped from scattering into the steel structure material, and the situation thatthe steel structure material oxidizes in the heat treatment process, and oxide scale is generated is effectively prevented; and in addition, the corrosion resistance and the abrasion resistance of thesteel structure material can be improved through the coating subjected to heat treatment, influence on direct using or follow-up machining of workpieces is avoided, and the wide application prospectis achieved.

The invention provides a semiconductor structure and a formation method thereof. The formation method comprises the following steps: providing a substrate, wherein the substrate comprises device areasand an isolation area, the device area substrate having fin portions and an initial isolation structure, the initial isolation structure covering side walls of the fin portions, the side walls, adjacent to the isolation area, of the initial isolation structure and the isolation area substrate forming an isolation groove; carrying out ion implantation on the side walls of the isolation groove to inject doping ions, and forming a barrier layer on the surfaces of the side walls of the isolation groove; after ion implantation, forming an isolation layer filling the isolation groove; and after forming the isolation layer, etching the initial isolation structure to expose the top portions and partial side wall surfaces of the fin portions and forming an isolation structure. The formation methodcan reduce the problem of inconsistency of fin portion width, and thus the performance of the semiconductor structure is improved.

The invention belongs to the technical field of thin film sensors, and provides a thermal shock-resistant high-temperature composite insulating layer and a preparation method thereof; the composite insulating layer includes a two-layer structure, which is Al from bottom to top 2 o 3 ~ Al‑O‑N gradient layer and microcrystalline Al 2 o 3 thin film insulating layer; the Al 2 o 3 ~The bottom layer of the Al‑O‑N gradient layer is Al 2 o 3 layer, the top layer is an amorphous Al-O-N film layer, and along the film growth direction, the content of N element increases. The composite film insulating layer of the present invention can form uniform and dense coverage on different parts such as the plane, bending, and folding of special-shaped precision components, effectively improve the uniformity and high-temperature insulation performance of the insulating layer, and effectively ensure the reliability of the film sensor under high temperature conditions and stability; at the same time, the solution method is used to prepare, and the sol-gel method can easily complete the coating of larger workpieces, which is beneficial to the realization of batch production; and the sol-gel method is low in cost and easy to operate. These factors make the present invention provide Composite insulating layer has a broader application prospect.

The invention discloses a protective film based on the corrosion resistance of metal niobium at high temperature and a preparation method thereof. The niobium bar is vacuum smelted, rolled and annealed sequentially, and then cut into experimental samples; the lead-bismuth alloy is melted to obtain a liquid Lead bismuth; put the processed experimental sample into the liquid lead bismuth and fix the sample, the Nb in the experimental sample and the oxygen dissolved in the liquid lead bismuth undergo interfacial reaction and diffusion reaction, firstly a layer of NbO surface film is formed; NbO The surface film further reacts with oxygen dissolved in liquid lead-bismuth to regenerate a layer of NbO 2 Protective film: take out the experimental sample and place it on a stainless steel sheet to cool the experimental sample to obtain metal niobium with a protective film. The invention lays a foundation for enlarging the application of refractory metals in China and industry.

The invention belongs to the field of carbon anode new materials for the electrolytic aluminium industry, and particularly relates to a preparation method of a graphene composite protective layer fora pre-baked carbon anode. The preparation method includes the steps of (1), adding graphene oxide in distilled water, stirring uniformly ultrasonically, adding phenolic resin with heating and stirring, performing redox reaction to obtain aqueous dispersion solution of graphene phenolic resin; (2) weighing a certain quantity of aqueous dispersion solution of graphene phenolic resin, sequentially adding graphite powder emulsion and nanometer aluminium oxide into the aqueous dispersion solution of graphene phenolic resin, and performing ultrasonic dispersion to obtain a graphene composite coating; (3), taking the graphene composite coating obtained the step (2), adding distilled water to dilute the graphene composite coating, covering the surface of the pre-baked carbon anode with the dilutedgraphene composite coating, and then drying naturally to obtain the graphene composite protective layer. The protective layer can effectively isolate oxidation action of air and carbon dioxide to carbon blocks; the carbon yield ratio in the air reactivity test is greater than 95%, and particularly the carbon yield ratio is greater than 96% after the CO2 reactivity test.

The invention discloses a preparation method of a refractory metal molybdenum protective film resisting liquid lead-bismuth corrosion. The preparation method comprises the steps of preparing molybdenum by a powder metallurgy method, forging, extruding and processing the molybdenum into a rod, cutting the rod into an experimental sample, and performing annealing; placing a lead-bismuth alloy in a muffle furnace to be melted into liquid lead-bismuth alloy; inserting the molybdenum rod experimental sample into a crucible containing a liquid lead-bismuth alloy, keeping the temperature and the oxygen concentration in the crucible in a saturated state, and performing corroding; cooling the liquid lead-bismuth alloy, rapidly taking out the molybdenum rod experimental sample, and placing the molybdenum rod experimental sample on a stainless steel sheet for rapid cooling; and obtaining a compact PbMoO4 / Pb2MoO5 double-layer structure metal protective film. Through detection and characterization,specific components, morphology, thickness, compactness and other comprehensive information of the protective film are obtained. The PbMoO4 / Pb2MoO5 double-layer protective film prepared by the methodgreatly prolongs the service life of the refractory metal molybdenum in the liquid lead and bismuth, and accelerates the application of the refractory metal molybdenum in the liquid lead and bismuth.

The invention relates to a metalized film used for a rail transit locomotive and a processing technology thereof. The processing technology comprises the steps of insulation basal film pretreatment, primary evaporation for preparing an aluminum coated layer, insulation basal film secondary treatment and performing secondary evaporation on the aluminum coated layer for composite preparing a tin coated layer. Oxidation of the aluminum coated layer can be effectively prevented by the tin coated layer, and sharp declining of the capacity of the capacitor does not occur in working under the AC high voltage and high current. The subsequent capacity of the capacitor does not influenced even insulation defects exist on the insulation basal film; and continuous breakdown of the multilayer insulation basal film does not occur in case of self-healing so that the phenomenon of large-area burning can be avoided. Therefore, the capacitor prepared by coiling of the metalized film can be massively applied to the rail transit locomotive to act as the energy storage component.

The invention discloses a silicon carbide-based composite foamed ceramic of a multilayer hole rib structure and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing silicon carbide, micro alumina powder, silicon powder, ammonium lignosulfonate, polycarboxylate and water so as to prepare slurry I; uniformly mixing micro alumina powder, a silicon source polycarboxylate and water so as to prepare slurry II; then dipping polyurethane sponge in the slurry I, and successively carrying out extruding or slurry centrifugation, drying and heat preservation at 600 to 850 DEG C for 0.5 to 3 h so as to obtain a presintered body of silicon carbide foamed ceramic; subjecting the presintered body of silicon carbide foamed ceramic to vacuum dipping in the slurry II and successively carrying out slurry centrifugation and drying so as to obtain a green body of silicon carbide-based composite foamed ceramic; and carrying out heat preservation at 1300 to 1500 DEG C in an air atmosphere for 2 to 4 h so as to prepare the silicon carbide-based composite foamed ceramic of the multilayer hole rib structure. The preparation method has the characteristics of simple process and low cost; and the prepared silicon carbide-based composite foamed ceramic of the multilayer hole rib structure has high mechanical strength, good thermal shock resistance and excellent high-temperature anti-oxidation performance.

The invention discloses an anti-oxidation treatment technology before steel structure material heat treatment. The anti-oxidation treatment technology specifically comprises the following steps of (1)steel structure material pretreatment, (2) steel structure material roughening treatment, and (3) steel structure material surface spraying treatment. According to the anti-oxidation treatment technology, by processing a steel structure material, on the premise that the strength of the steel structure material meets the industrial requirement, the grain size of the steel structure material is increased as much as possible, the surface height of the steel structure material is made to be different, and accordingly, the surface roughness of the steel structure material is improved; then, spraying powder is sprayed onto the surface of the steel structure material, an anti-oxidation coating is formed, oxygen is stopped from scattering into the steel structure material, and the situation thatthe steel structure material oxidizes in the heat treatment process, and oxide scale is generated is effectively prevented; and in addition, the corrosion resistance and the abrasion resistance of thesteel structure material can be improved through the coating subjected to heat treatment, influence on direct using or follow-up machining of workpieces is avoided, and the wide application prospectis achieved.

The invention discloses a processing method for inhibiting browning of dried fruit slices. The processing method comprises the following steps: raw material pretreatment, plant colloid embedding, liquid nitrogen pre-cooling, low-temperature mixed gas quick freezing, low-temperature vacuum lyophilization, heat pump drying and packaging. According to the processing method, the shortcomings of the existing dried fruit slice processing method and the quality defect of a product are overcome; the processing time is further shortened, the energy consumption is reduced, the production efficiency is improved, browning of the dried fruit slices is effectively inhibited, the drying quality is high, the color, the fragrance, the shape, the biological activity and the nutritional components of the dried fruit slices are retained to the maximum extent, and the preservation time is long.

The invention provides a slope protection structure of a sea cucumber culturing pond and a construction method thereof, wherein the slope protection structure and the construction method belong to the field of aquaculture. The slope protection structure comprises a freshwater discharging trench, a slope upper edge, a slope surface, fixed pendants and a slope lower trough. The freshwater discharging trough is arranged at the central part in a pond dam and forms an independent ditch along the longitudinal direction of the pond dam. The slope upper edge extends along the dam body and is forms a ridge-shaped member above the pond dam. The slope upper edge is connected with the upper end of the slope surface of the pond. The lower end of the slope surface of the pond is connected with the bottom of the pond. An included angle is formed between the slope surface of the pond and the bottom surface of the pond. The lower end of the slope surface extends to the portion below the bottom surface of the pond along the slope surface, thereby forming the slope lower trough of a recessed structure. The portion above the slope lower trough is compressed by soil at the bottom of the pond. Fixed pendants are arranged on the slope surface in a laying manner. The materials of the slope protection are characterized in that a canvas layer is laid in a manner of clinging to the ground and a cement mortar is laid above the canvas through high-pressure injection. The slope protection structure has advantages of simple laying, low cost, long service life and easy popularization.

The invention provides magnesium alloy smelting protection solvent and a preparation method thereof. The magnesium alloy smelting protection solvent comprises the following chemical components in parts by weight: 8-15 parts of barium carbonate, 12-15 parts of calcium sulfate, 12-17 parts of nanometer zirconium oxide, 12-15 parts of magnesium chloride, 12-20 parts of hydroxyapatite, 12-20 parts of magnesium silicate, and 1-5 parts of lithium chloride. The preparation method is to perform the mixing after the drying. The smelting protection solvent, provided by the invention, is molten to a liquid state in an environment of higher than 500 DEG C in the smelting process, and is spread on the surface of an alloy or molten magnesium to achieve an air isolating effect and to stop the magnesium oxidation so as to obtain excellent protection performance.

The invention provides an atomic oxygen disulfide-resistant molybdenum disulfide-based organic or inorganic hybrid lubricating coating and a preparation method thereof. Composed of oxidation modifier, dispersant, mixed solvent and modified silica sol. The present invention can overcome the problem that the adhesive and lubricant of MoS2 solid lubricating coating bonded by polyamide-imide for space are easily oxidized by atomic oxygen, and is especially suitable for the moving parts of aircraft in the space low-orbit environment, such as gears, screw-nuts, Surface lubrication and anti-cold welding treatment of friction pairs such as shaft-shaft sleeves and slideways.

The invention relates to a device and method for deslagging in steel strip feeding of a gas shield continuous casting crystallizer. The device and method for deslagging are used for the continuous casting crystallizer. Molten steel is positioned in the crystallizer, and the top surface of the molten steel is provided with covering slag. The deslagging device comprises a hollow cover body, the top of the cover body is provided with an upper cover, the upper cover is provided with a feeding port and an air inlet, the upper cover is used for feeding a steel strip, the air inlet is used for inert gas to enter, the lower end of the cover body enters the molten steel, and the bottom of the cover body is connected with a steel deslagging part. The steel deslagging part discharges the covering slag and enters the molten steel, and the size of the steel deslagging part is gradually reduced from top to bottom. The inert gas enters from the air inlet and is discharged through a hole of the feeding port, so as to protect the molten steel from oxidation. In the process of extending the deslagging device into the crystallizer, the steel deslagging part with the wide top and the narrow bottom discharges the covering slag, part of the cover body is soaked into the molten steel, and the covering slag is prevented from entering the cover body. Therefore, in the processing of inserting the steel strip into the molten steel, the molten steel is not touched, and the covering slag is prevented from entering the molten steel.