49results about How to "Excellent hydrogen resistance" patented technology

The invention relates to an Y2O3 / Al2O3 / Cr2O3 composite gradient hydrogen resistant coating and a preparation method thereof. The hydrogen resistant coating is used for resisting hydrogen permeation on a stainless steel structural member, especially resisting the hydrogen permeation on an inner stainless steel tube in a solar energy high-temperature vacuum collector tube. The composite gradient hydrogen resistant coating is composed of the stainless steel tube and an Y2O3 / Al2O3 / Cr2O3 composite coating which is applied on an inner surface of the stainless steel tube. The composite coating is prepared through a metal-organic chemical vapor deposition method, wherein a Cr2O3 coating, an Al2O3 coating and an Y2O3 coating are successively deposited to form the Y2O3 / Al2O3 / Cr2O3 composite gradient hydrogen resistant multilayer coating being 0.1-20 [mu]m in thickness. The hydrogen resistant coating is strong in combination strength with a substrate, is simple in preparation process and is low in cost, and is improved in hydrogen resistant performance by more than 300 times.

The invention relates to a high-binding-strength aluminum oxide resistance to hydrogen permeation and corrosion-resistant insulating layer and a preparation method and application thereof. The coating can be prepared by cold spraying, chemical vapor deposition, magnetron sputtering, thermal spraying and other methods on the surface of the substrate to prepare a layer of iron-chromium-aluminum alloy mixed in a certain proportion, and then obtain a thickness of 0.05-1μm by thermal oxidation. α‑Al is dense and has good bonding strength with the substrate, and has excellent hydrogen permeation resistance effect 2 o 3 Oxide layer, the temperature of the substrate during all operations can be controlled below 800°C. In addition to excellent hydrogen permeation resistance, strong self-healing ability and corrosion resistance and insulation ability, the hydrogen permeable layer provided by the present invention has the biggest outstanding advantage of excellent bonding strength with the substrate. The hydrogen-resistant coating can be used as a hydrogen-permeable barrier layer for stainless steel structural parts, especially for a hydrogen-permeable barrier layer on the surface of fusion reactor inner cladding components.

The steel according to the invention is characterized in that, in order to keep its weight content of molybdenum below 0.45%, its chemical composition, besides the iron and the inevitable residual impurities that result from the smelting of the steel, corresponds to the following analysis, given as percentages by weight:0.3≦C %≦0.50.20≦Mo %<0.450.4≦Mn %≦1.00.4≦Cr %≦2.00.04≦Ni %≦0.80.02≦Nb %≦0.0450.03≦V %≦0.300.02≦Ti %≦0.05, with Ti>3.5 N0.003≦B %≦0.005%S %≦0.015P %≦0.015,and optionally 0.05≦Si %≦0.20; Al %≦0.05 and N %≦0.015.By cold forming a hot-rolled wire rod resulting from continuous casting, it is possible to obtain, after heat treatment, “ready-to-use” coined parts, such as cap screws for example for the automotive industry, that offer a tensile strength from 1200 to more than 1500 MPa while having a good hydrogen embrittlement resistance, and this with a specially controlled “raw material” production cost.

The present invention provides an optical fiber preform having a core made of Ge-free silica glass, wherein the core has at least one of the following characteristics (1) and (2) in spectrometry: (1 ) has an absorption peak at a wavelength of 240nm to 255nm; (2) the wavelength at which the ultraviolet transmittance is below 50% is greater than 170nm.

The hydrogen-resistant motor based on rare earth permanent magnets of the present invention belongs to the technical field of permanent magnet motors; the present invention includes a motor stator, a motor rotor and a rare earth permanent magnet, the motor stator is provided with a motor rotor, and the motor stator and the motor rotor are provided with There are rare earth permanent magnets; the rare earth permanent magnets are Sm 2 (CoCuFeZr) 17 For the magnet, the mass percentage of Sm is m, the sum of the mass percentages of Co and Fe is n, and n>3m. The present invention makes the rare earth permanent magnet Sm 2 (CoCuFeZr) 17 Magnet densification, combined with heat treatment, makes the surface of rare earth permanent magnets more dense and stable, so as to reduce the path of hydrogen atoms entering the grain boundary from the surface of the material, and improve the hydrogen resistance of rare earth permanent magnets, so as to prevent hydrogen gas from entering the magnet.

The invention relates to an Y2O3 / Al2O3 composite gradient hydrogen resistant coating and a preparation method thereof. The coating is used for resisting hydrogen permeation in a high-temperature vacuum collector tube. The composite gradient hydrogen resistant coating is composed of the stainless steel tube and an Y2O3 / Al2O3 composite coating which is applied on an inner surface of the stainless steel tube. The composite coating is prepared through a metal-organic chemical vapor deposition method, wherein an Al2O3 coating and an Y2O3 coating are deposited repeatedly on the inner surface to form the multilayer Y2O3 / Al2O3 composite gradient hydrogen resistant coating being 0.1-20 [mu]m in thickness. The coating is in a multilayer alternated structure with the most inner layer being Al2O3 and the most outer layer being Y2O3. The hydrogen resistant coating is strong in combination strength with a substrate, is simple in preparation process and is low in cost, and is improved in hydrogen resistant performance by more than 200 times.

This austenitic stainless steel contains, by mass %: C: 0.3% or less, Si: 0.1% to 1.5%, Mn: 5.5% to 20%, P: 0.050% or less, S: 0.005% or less, Cr: 10% to 20%, Ni: 4.0% to 12%, N: 0.40% or less, Cu: 4.0% or less, O: 0.02% or less, and either one or both of Ca: 0.01% or less and Al: 0.3% or less, with a remainder being Fe and inevitable impurities, and the following Formula (1) is satisfied.[Ni]+[Cu]+12.93[C]+1.11[Mn]+0.72[Cr]+0.88[Mo]−0.27[Si]+7.55[N]≥29.3   Formula (1)

The present invention relates to a submarine photoelectric composite cable non-universal type optical unit and its manufacture method. Its structure includes the following several portions: several optical fibres, plastic tube, stainless steel tube, water-proof material, high-strength armouring steel wire and external protective layer. Said invention also provides the concrete steps of its manufacture method.

The invention discloses a dispersed proton conductive ceramic electrolyte membrane and a preparation method thereof. The film is formed on the surface of the ceramic tube and is made of film material SrCe 1‑x Yb x o 3‑α and SrCe 1‑ x Er x o 3‑α composed of dispersed thin films, in which SrCe 1‑x Yb x o 3‑α Main phase, SrCe 1‑x Er x o 3‑α Dispersed in the main phase. The preparation method comprises the following steps: (1) ultrasonically cleaning the surface of the ceramic tube for 15-30 min, and drying; (2) simultaneously depositing SrCe on the surface of the ceramic tube by metal-organic chemical vapor deposition technology. 1‑x Yb x o 3‑α and SrCe 1‑x Er x o 3‑α , the metal reaction sources are Yb organic reaction source and Er organic reaction source respectively, and the carrier gas is H 2 ; By adjusting the reaction source temperature and reaction time to make SrCe 1‑x Yb x o 3‑α phase becomes the main phase, and finally a dispersed proton-conducting ceramic electrolyte film is obtained. The film of the present invention has the characteristics of high bonding strength with the substrate, high compactness, uniformity and stability, and excellent hydrogen resistance performance, and can be applied to solid oxide fuel cells, electrolysis of water for efficient production of hydrogen, synthesis of ammonia under normal pressure, separation and purification of hydrogen, etc. aspect.

The invention discloses a corrosion-resistant shake-proof hammer and a surface treatment technique thereof and relates to the technical field of shake-proof hammers of power transmission equipment. The corrosion-resistant shake-proof hammer is composed of, by mass, 0.35%-0.87% of carbon, 0.75%-2.58% of silicon, 12.25%-15.87% of chromium, 3.6%-5.3% of nickel, 0.8%-1.2% of molybdenum, 5.2%-12.6% of manganese, 0.005%-0.009% of niobium, 2.3%-3.5% of aluminum, 3%-8% of copper and the balance ferrum. The corrosion-resistant shake-proof hammer has the advantages of being large in density and good in shake-proof effect; and by spraying a surface coating on the shake-proof hammer, the corrosion resistance and abrasion resistance of the shake-proof hammer are remarkably improved, and thus the service life of the shake-proof hammer is remarkably prolonged.