19 results about "Cerium fluoride" patented technology

The embodiment of the invention provides a friction material composition, a brake lining, a preparation method of the brake lining, a brake and a vehicle. The friction material composition comprises the following raw materials in parts by weight: 2-10 parts of a fluoride mixture, 8-15 parts of graphite, 8-12 parts of phenolic resin, 4-12 parts of a metal oxide, 15-40 parts of a fiber material and 20-40 parts of other fillers, wherein the fluoride mixture comprises at least two of calcium fluoride, barium fluoride, cerium fluoride, aluminum fluoride, magnesium fluoride, potassium fluoride, sodium fluoride, beryllium fluoride and manganese fluoride. The brake lining prepared from the friction material composition can solve the problems of high wear rate and heat fading at the same time, the service life of the brake lining is prolonged, and the braking effect is improved.

The invention provides a high-toughness austenitic stainless steel welding rod for 5Ni steel and a preparation method of the high-toughness austenitic stainless steel welding rod. The welding rod comprises a core wire and a coating coated on the surface of the core wire, and based on the total amount of the core wire, the core wire comprises the following components in percentage by mass: less than or equal to 0.09% of C, less than or equal to 0.15% of Si, 1.6-2.5% of Mn, 18.5-20.5% of Cr, 12.5-14.5% of Ni, 2.1-3.2% of Mo and 0.06-0.18% of Ti; 0.12-0.24% of Al, less than or equal to 0.007% of S, less than or equal to 0.008% of P, less than or equal to 0.006% of O, less than or equal to 0.001% of H, less than or equal to 0.012% of S + P, and the balance Fe and inevitable impurities. On the basis of the total amount of the coating, the coating comprises, by mass, 28-38% of carbonate, 15-20% of fluorite, 1-3% of lithium fluoride and sodium fluoride, 8-12% of synthetic mica, 3-6% of potassium silicotitanate, 2-4% of zircon sand, 9-15% of electrolytic manganese metal, 2-4% of ferrotitanium, 2-5% of passivated nickel-magnesium alloy, 1-3% of atomized ferrosilicon, 1-3% of lanthanum cerium fluoride, 1-3% of tungsten and molybdenum, 3-5% of nitrided ferrochromium and 1-2% of CMC. The welding rod is good in all-position welding controllability, extremely low in air hole sensitivity and excellent in low-temperature toughness, and can meet the requirements for high-quality and efficient welding of 5Ni steel.

The invention discloses a method for separating and recovering fluorine from a waste acid solution, which comprises the following steps: S1, taking a solution to be treated, and adding an extracting agent for extraction to obtain an organic phase and a water phase; the extraction agent is an N235 extraction agent; and S2, adding a cerium (III) salt solution into the organic phase as a stripping agent, layering, and recovering cerium fluoride precipitate in the stripping solution. According to the scheme, cerium salt is adopted as a stripping agent, and fluorine is separated out in a water-insoluble cerium fluoride precipitation form by utilizing the strong coordination effect between Ce < 3 + > and F <->, so that fluorine in an organic phase is directly converted into a high-purity cerium fluoride product. The method breaks through the limitation that only fluorine is separated and direct recycling is difficult in a traditional reverse extraction process, and one-step method recycling of fluorine is achieved. And the organic phase after reverse extraction can be directly regenerated and recycled, so that the medicament consumption is reduced, and the economical efficiency of the process is also improved.

The application belongs to the technical field of fuel cells, and discloses a porous cerium fluoride catalyst, a preparation method and application thereof. The application adopts an impregnation method to synthesize a composite oxide precursor with silica as a template, obtains the composite oxide after calcination, and then adopts hydrofluoric acid etching and fluorination to prepare cerium fluoride. Finally, the porous cerium fluoride, a carrier, a platinum source aqueous solution and an alcohol solution are mixed to perform a hydrothermal reaction, and the porous cerium fluoride catalyst is obtained. The application etches away the template skeleton by using hydrofluoric acid to form a porous structure. The pore diameter of the cerium fluoride carrier is controlled by adjusting the concentration of the hydrofluoric acid, the specific surface area of the catalyst carrier is increased, more active sites are provided for the adsorption of platinum nanoparticles, the proton transmission speed is accelerated, the amount of noble metal is reduced, and the catalyst activity is improved.

The invention provides a high-chromium cast iron surfacing flux-cored wire for a shield tunneling machine and a preparation method of the high-chromium cast iron surfacing flux-cored wire. The high-chromium cast iron surfacing flux-cored wire is formed by wrapping powder with a steel belt, and the powder accounts for 33.0%-36.0% of the total weight of the flux-cored wire; the powder comprises, by mass, 3%-8% of reduced iron powder, 1%-3% of fluorite, 0.5%-1% of rare earth fluoride, 3%-8% of electrolytic manganese, 1%-5% of high silicon iron, 80%-85% of ferrochrome carbide, 5%-9% of graphite and 1%-3% of nickel powder. Wherein the rare earth fluoride is cerium fluoride. The high-chromium cast iron surfacing flux-cored wire for the shield tunneling machine is excellent in welding process, stable in electric arc, small in splashing, attractive in forming and capable of conducting all-position welding.

The application relates to the technical field of magnets, in particular to a cerium-doped high-coercivity neodymium-iron-boron magnet and a preparation process thereof. In view of the problem that the existing cerium-doped magnet has insufficient coercivity and reduced remanence due to uneven distribution of cerium, the process comprises the following steps: fluorination treatment on the surface of a main phase powder, cold pressure forming in a magnetic field, electrophoretic deposition to build a cerium fluoride skeleton, step-by-step vacuum impregnation of cerium salt and a fluorine source, and degreasing, sintering and grain boundary heat treatment. The method controls the uniform enrichment of cerium at the grain boundary, forms a continuous and dense grain boundary phase, effectively improves the intrinsic coercivity, remanence and high-temperature stability, simultaneously improves the corrosion resistance and reduces the dependence on heavy rare earths.

This invention discloses a rare-earth metal fluoride superionic conductor dielectric film and its preparation method. The dielectric film is prepared from a rare-earth metal fluoride superionic conductor using a thermal evaporation method. The rare-earth metal fluoride superionic conductor is selected from scandium fluoride, yttrium fluoride, lanthanum fluoride, cerium fluoride, neodymium fluoride, samarium fluoride, europium fluoride, gadolinium fluoride, holmium fluoride, erbium fluoride, ytterbium fluoride, praseodymium fluoride, promethium fluoride, terbium fluoride, dysprosium fluoride, thulium fluoride, and lutetium fluoride. This invention utilizes thermal evaporation to heat and evaporate the rare-earth metal fluoride source material into a gaseous state within an evaporation system. The gaseous fluoride directly adheres to a substrate placed above the source material and recrystallizes. This allows for controllable thickness and defect number of the rare-earth metal fluoride, resulting in high integration. Therefore, rare-earth metal fluoride superionic conductor dielectric materials show great potential in the design and manufacture of novel functional devices.

A solid-state imaging device according to an embodiment includes: a semiconductor substrate including a photoelectric conversion element; a lens disposed above a first light incident surface of the photoelectric conversion element; and a plurality of columnar structures disposed on a surface parallel to the first light incident surface that is located between a second light incident surface of the lens and the first light incident surface of the photoelectric conversion element. The columnar structure includes at least one of silicon, germanium, gallium phosphide, aluminum oxide, cerium oxide, hafnium oxide, indium oxide, tin oxide, niobium pentoxide, magnesium oxide, tantalum pentoxide, titanium pentoxide, titanium oxide, tungsten oxide, yttrium oxide, zinc oxide, zirconia, cerium fluoride, gadolinium fluoride, lanthanum fluoride, and neodymium fluoride.

The application discloses a welding rod for 1000MPa high-strength steel and a preparation method thereof. The welding rod comprises a coating and a welding core, and the coating is wrapped on the outside of the welding core. The coating powder comprises the following components in parts by weight: 30-35 parts of fluorite, 20-30 parts of dolomite, 5-8 parts of strontium carbonate, 2-5 parts of sodium titanium silicate, 5-10 parts of potassium oxalate, 5-10 parts of atomized ferrosilicon, 2-5 parts of titanium powder, 0.5-1.0 parts of lanthanum cerium fluoride, 1-5 parts of lithium carbonate, 1-2 parts of sodium carboxymethyl starch, 0.5-1.5 parts of copper powder and 8-15 parts of iron powder. The welding rod has excellent all-position welding process performance, the arc is stable during welding, fine droplet transition is presented, the molten slag has moderate fluidity, the welding spatter is small, and the weld formation is fine and beautiful.

The application belongs to the technical field of welding materials, and specifically provides a self-cleaning anti-cracking submerged arc flux, which comprises, in percentage by mass, 25-30% of magnesium fluoride, 8-15% of calcined alpha aluminum oxide, 15-20% of calcium silicate, 3-12% of rutile, 4-9% of silicon-barium alloy, 2-5% of aluminum-barium alloy, 7-10% of silicon-zirconium alloy, 0.5-1.5% of molybdenum iron, 1.5-2.5% of titanium iron, 0.6-2.0% of boron iron, 0.4-0.7% of vanadium-niobium alloy, 0.6-1.2% of strontium carbonate, 1-2% of cerium fluoride, and the balance of iron powder. The self-cleaning anti-cracking submerged arc flux has high toughness and excellent anti-cracking performance, and can be used in combination with H10Mn2, EH14, H08Mn2E and other welding wires to meet the welding requirements of 50-55Kg grade thick plates Q345, Q420, Q460 and other materials at-60 DEG C in the wind power industry.

The utility model provides a tail gas treatment device in praseodymium-neodymium metal production. The tail gas treatment device comprises an electrolysis workshop, an induced draft fan, a first absorption tower, a second absorption tower and a third absorption tower which are sequentially connected in series, the first absorption tower and the second absorption tower are respectively connected with the acid water treatment device to form a loop, the first absorption tower and the second absorption tower are also respectively connected with the clear water storage tank, and the acid water treatment device is also connected with the cerous carbonate solution storage tank; the third absorption tower is also connected with an alkali absorption liquid treatment device to form a loop. According to the scheme, the equipment is used in cooperation, fluorine in the electrolytic tail gas is converted into cerium fluoride with high recovery value to achieve recovery of fluorine resources, residual fluorine is treated through the alkaline calcium solution to achieve defluorination of the electrolytic tail gas, and the defect that the fluorine resources in the electrolytic tail gas in existing praseodymium-neodymium metal treatment production cannot be fully utilized is overcome.

The invention relates to the technical field of magnets, in particular to a cerium-doped high-coercivity neodymium-iron-boron magnet and a preparation process thereof. In order to solve the problems of insufficient coercive force and reduced residual magnetism caused by non-uniform cerium distribution of the existing cerium-doped magnet, the process comprises the following steps: main phase powder surface fluorination treatment, magnetic field orientation cold press molding, construction of a cerium fluoride skeleton by electrophoretic deposition, step-by-step vacuum impregnation of cerium salt and a fluorine source, and degreasing sintering and grain boundary heat treatment. According to the method, uniform enrichment of cerium at the grain boundary is controlled, a continuous and compact grain boundary phase is formed, the intrinsic coercive force, residual magnetism and high-temperature stability are effectively improved, meanwhile, corrosion resistance is improved, and dependence on heavy rare earth is reduced.

A solid-state imaging device according to an embodiment includes: a semiconductor substrate including a photoelectric conversion element; a lens disposed above a first light incident surface of the photoelectric conversion element; and a plurality of columnar structures disposed on a surface parallel to the first light incident surface that is located between a second light incident surface of the lens and the first light incident surface of the photoelectric conversion element. The columnar structure includes at least one of silicon, germanium, gallium phosphide, aluminum oxide, cerium oxide, hafnium oxide, indium oxide, tin oxide, niobium pentoxide, magnesium oxide, tantalum pentoxide, titanium pentoxide, titanium oxide, tungsten oxide, yttrium oxide, zinc oxide, zirconia, cerium fluoride, gadolinium fluoride, lanthanum fluoride, and neodymium fluoride.

The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a black steel slag microcrystalline plate and a preparation method thereof. The black steel slag microcrystalline plate is prepared from the following raw materials in percentage by mass: 48 to 52 percent of steel slag, 33 to 37 percent of bottom slag, 8.5 to 10.5 percent of sodium carbonate, 0.5 to 1 percent of sodium sulfide, 3 to 3.5 percent of sodium fluosilicate, 0.6 to 0.8 percent of barium titanate, 0.04 to 0.06 percent of porous graphene microflowers, 0.2 to 0.3 percent of cerium fluoride, 0.6 to 0.8 percent of sodium pyrophosphate and 0.02 to 0.03 percent of color complementing agent. According to the black steel slag microcrystal plate and the preparation method thereof, the solid waste absorption amount and the product additional value are remarkably improved, a brand new scheme is provided for low-cost green manufacturing of the black microcrystal plate through the technical path of color control with waste, and the black steel slag microcrystal plate and the preparation method thereof have remarkable environmental benefits and industrialization prospects.

3D printing process (M3) with the following steps: Local injection (M31) of a plasma at a working area of ​​a 3D printing device (10), wherein the plasma has a comprising a surface coating component selected from the group consisting of boron nitride, graphene, carbon nanotubes, tungsten sulfide, tungsten carbide, molybdenum sulfide, molybdenum carbide, calcium fluoride, cesium molybdenum oxide sulfide, titanium silicon carbide and cerium fluoride; and Laser sintering or laser melting (M32) of a powder mixture (Ps) in a selective laser sintering process or a selective laser melting process in the working area of ​​the 3D printing device (10), wherein the powder mixture (Ps) comprises a sintering component selected from the group consisting of ceramic materials, ceramic material combinations, metallic materials, metallic material combinations and metallic alloys.

The invention provides a submerged-arc welding agent for an extremely low temperature LNG storage tank. The submerged-arc welding agent is used in combination with a matched hastelloy submerged-arc welding wire for the extremely low temperature LNG storage tank. The submerged arc welding flux is prepared from the following components in parts by weight: 22 to 36 parts of alpha type aluminum oxide, 6 to 18 parts of magnesia, 8 to 15 parts of fluorite, 6 to 12 parts of barium fluoride, 0.5 to 1.5 parts of cerium fluoride, 3 to 8 parts of wollastonite, 1.2 to 3.6 parts of mullite, 2 to 5 parts of bentonite, 1.6 to 2.4 parts of potassium cryolite, 0.8 to 3.6 parts of zirconium oxide, 1.6 to 3.2 parts of barium carbonate, 1.6 to 4.8 parts of alloy powder and 18 to 24 parts of water glass. The alloy powder is a combination of manganese-silicon alloy and aluminum-magnesium alloy. The welding flux is combined with a matched welding wire for use, deposited metal is stable and excellent in low-temperature toughness, the corrosion resistance is better, and the welding flux is particularly suitable for the inner wall and key positions of the LNG storage tank.

The application discloses a method for removing calcium and producing cerium fluoride from fluorite-containing fluorocarbon cerite, which comprises the following steps: (1) grinding and sampling fluorite-containing fluorocarbon cerite after flotation, and sieving to obtain a mineral powder; (2) dissolving cerium dioxide to obtain a high-cerium nitrate solution; (3) using the high-cerium nitrate solution as a bottom water, slurry is prepared by using the mineral powder, nitric acid solution is added for stirring and reaction, flocculation and clarification are carried out, and then undissolved and floated minerals and a clear and transparent solution are obtained; the undissolved and floated minerals are filtered, washed and dried for later use; (4) the clear and transparent solution is added into ammonia water to precipitate a crude cerium fluoride product, the pH of the solution is adjusted to 1.0, stirring and reaction are carried out, the crude cerium fluoride product is washed and then calcined to obtain a cerium fluoride product. The method uses the high-cerium nitrate solution and the nitric acid solution to dissolve and float the minerals, and then the floated minerals without fluorite and the cerium fluoride product are obtained; and no reagent such as sodium hydroxide is used, so that the processing difficulty and cost of each section are reduced, and the utilization rate of fluorine sources is improved.

The application discloses a high-pressure-resistant fracturing valve body processing method and relates to the technical field of surface treatment. The processing method comprises sequentially performing substrate pretreatment and functional coating treatment on a valve body substrate, and specifically comprises the following steps: after polishing and cleaning the surface of the valve body substrate, performing supersonic particle bombardment test on the surface of the substrate by adopting alumina pellets to obtain a pretreated substrate; glass flake, boron carbide, molybdenum disulfide, cerium fluoride, titanium white powder, talc powder, polyether modified siloxane, silicon powder, pH sensitive corrosion inhibitor microspheres are sequentially added into graphene / polyether sulfone modified phenolic epoxy resin and mixed, and after uniform stirring, a curing agent is added, and after continuing to stir and add oil, the mixture is coated on the surface of the pretreated substrate, and after drying, a high-pressure-resistant fracturing valve body is obtained. The valve body processing method provided by the application can significantly improve the high-temperature and high-pressure resistance and oil field sewage corrosion resistance of the valve body.

The invention discloses a treatment method of a high-pressure-resistant fracturing valve body, and relates to the technical field of surface treatment.The treatment method comprises the steps that a valve body base body is sequentially subjected to base body pretreatment and functional coating treatment; the method specifically comprises the following steps that after the surface of a valve body base body is polished and cleaned, aluminum oxide pellets are adopted for conducting a supersonic particle bombardment test on the surface of the base body, and a pretreated base body is obtained; glass flakes, boron carbide, molybdenum disulfide, cerium fluoride, titanium dioxide, talcum powder, polyether modified siloxane, silica powder and pH-sensitive corrosion inhibitor microspheres are sequentially added into graphene / polyether sulfone modified novolac epoxy resin to be mixed, a curing agent is added after uniform stirring, stirring and oil adding are continued, the surface of a pretreated matrix is coated with the mixture, and after drying, the graphene / polyether sulfone modified epoxy resin composite material is obtained. And the high-pressure-resistant fracturing valve body is obtained. According to the treatment method of the valve body, the high-temperature and high-pressure resistance and the oil field sewage corrosion resistance of the valve body can be remarkably improved.