32results about How to "Oxidation barrier" patented technology

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 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 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.