91 results about "Ce element" patented technology

The composition general formula of the vanadium-based hydrogen storage alloy is VxTiyCrzCCe, x is larger than or equal to 0.7 and smaller than or equal to 0.8, y is larger than or equal to 0.04 and smaller than or equal to 0.1, z is larger than or equal to 0.1 and smaller than or equal to 0.18, x + y + z = 1, and a is larger than or equal to 0.001 and smaller than or equal to 0.005. The prepared vanadium-based hydrogen storage alloy has the advantages that the preparation process is simple, the hydrogen storage alloy which is easy to activate, high in capacity and good in cycling stability can be obtained by adding trace Ce, and the vanadium-based hydrogen storage alloy is suitable for large-scale generation preparation and commercial application. The alloy is prevented from being locally oxidized in the smelting process due to a small amount of Ce element, and the problem that the hydrogen absorption capacity is reduced due to excessive rare earth elements is avoided, so that the activation performance of the alloy is improved, and meanwhile, the high hydrogen storage capacity is obtained.

The invention discloses a preparation method of an aluminum alloy cast rod. The preparation method comprises the following steps: mixing and melting an intermediate alloy containing an aluminum element, an intermediate alloy containing a Mn element and an intermediate alloy containing a Fe element; an online refiner is added; carrying out refining treatment on the molten liquid, and carrying out slagging-off operation to remove impurities; an intermediate alloy containing the Ce element is added into the molten liquid obtained after refining and slagging-off, and the final adding amount of the Ce element in the aluminum alloy casting rod is 0.3-1 wt% by mass; and the melt added with the Ce element is filtered, the treated melt is cast, and the aluminum alloy cast rod is obtained. The strength, the tensile strength and the yield strength of the aluminum alloy modified through the method are all remarkably improved.

The invention relates to the technical field of aluminum alloy materials, and provides a high-thermal-conductivity 6xxx aluminum alloy, a preparation method thereof and an electronic product structural part. Wherein the 6xxx aluminum alloy comprises the following components in percentage by mass: 0.3 to 0.5 percent of Mg, 0.2 to 0.35 percent of Si, 0.08 to 0.12 percent of Ce, less than or equal to 0.10 percent of Cu, less than or equal to 0.15 percent of Fe, less than or equal to 0.05 percent of Mn, less than or equal to 0.10 percent of Zn, less than or equal to 0.05 percent of Ti, less than or equal to 0.15 percent of total impurities and the balance of Al; and Mg / Si is in the range of 1.3 to 1.5. According to the 6xxx aluminum alloy and the preparation method thereof, the content and the mass ratio of Si and Mn are accurately regulated and controlled, meanwhile, a trace Ce element is added, the thermal conductivity and the anodic oxidation performance of the 6xxx aluminum alloy are improved, solid solution and aging processes are further matched, the beta ''phase and the grain size are controlled, and the alloy has the excellent anodic oxidation performance while having the high thermal conductivity.

The invention discloses a coating for improving the paint adhesion capability of a metal part of a distribution box, and the coating is prepared by the following steps: depositing a first oxide layer on the metal surface, the first oxide layer comprising Zn element and Ce element; a second oxide layer is deposited on the surface of the first oxide layer, the second oxide layer comprises a Zn element and a Ce element, and the molar ratios of the Zn element and the Ce element of the first oxide layer and the second oxide layer are different; a third oxide layer is deposited on the surface of the second oxide layer, and the third oxide layer comprises a Zn element and a Dy element; and a fourth oxide layer is deposited on the surface of the third oxide layer, the fourth oxide layer comprises a Zn element and a Dy element, and the molar ratios of the Zn element and the Dy element of the third oxide layer and the fourth oxide layer are different. The coating provided by the invention can improve the adhesive ability of the paint to a metal substrate.

The invention discloses a titanium alloy seamless tube and a preparation method thereof. The titanium alloy seamless tube comprises the following chemical components in percentage by mass: 5%-6.5% of Al, 1.5%-3% of Mo, 1.5%-2% of V, 3%-4% of Zr, 2.5%-3.6% of Sn, 0.5%-1.5% of Nb, 0.2%-0.5% of Si, 0.4%-0.6% of B, 0.8%-1.2% of Ce and the balance of Ti and other inevitable impurity elements. The preparation method comprises the working procedures of titanium alloy smelting, pipe blank casting, forging, heat treatment and cold rolling. According to the titanium alloy seamless tube, on the basis of TA15 alloy, components are optimized, the proportion of all the elements is regulated and controlled, and B and Ce elements in a specific proportion are further added; the preparation method is matched with the titanium alloy component, the structure uniformity and the surface quality of the pipe are improved, and the prepared titanium alloy seamless pipe has the excellent performance of high strength and high toughness.

The invention discloses a sintered neodymium-cerium-iron-boron magnet with high comprehensive magnetic performance, which is prepared by uniformly mixing and pressing alloy powder with a chemical formula of (Nd1-xCex) aM100-a-b-cFebBc and one or more kinds of X-B alloy powder and carrying out sintering and tempering treatment, a is more than or equal to 28 and less than or equal to 33, b is more than or equal to 58 and less than or equal to 69, c is more than or equal to 0.8 and less than or equal to 1.1, x is more than 0 and less than or equal to 20, and b is more than or equal to 1 and less than or equal to 3. M is one or more of Zn, Ga, Co, Cu, Nb, Si, Mn and Al, and X is one or more of Ti, Hf, Zr, Cr and Mo. The preparation method comprises the steps of raw material proportioning, rapid hardening melt-spinning, hydrogen crushing, airflow grinding powder preparation, mixed powder compression, sintering and tempering heat treatment. The X-B compound is introduced, a multi-stage induction system is constructed in the magnet, directional migration and enrichment of Ce elements in a grain boundary area are effectively regulated and controlled, an excellent magnetic microstructure with a Ce-rich grain boundary phase and a main phase mainly comprising Nd2Fe14B is formed, a grain boundary engineering strategy without additional heavy rare earth element compensation is provided, and the preparation method has the advantages of being simple in process, low in cost and easy to popularize. And efficient utilization of high-abundance rare earth resources and comprehensive improvement of performance are achieved, and good technical advancement and industrial application prospects are achieved.

The present invention belongs to the technical field of rare earth permanent magnet materials and relates to a cerium-containing rare earth permanent magnet. The chemical formula of the permanent magnet is as follows: (Ce x RE 1‑x ) 30 Fe 69.1‑y B 0.9 TM y , wherein: 0.018≤x≤0.18, 0.5≤y≤2.5; RE is one or more of Pr, Nd, Dy, Tb, Ho; TM is one or more of Ga, Co, Al, Cu, Nb, Zr, Ti; in the permanent magnet, the rare earth Ce element replacing RE is CeFe 2 phase exists at the grain boundary, and the main phase of the permanent magnet has RE 2 Fe 14 B phase structure; the permanent magnet is obtained by preparing quick-setting sheets, crushing and powdering, magnetic field orientation molding, sintering and heat treatment. The present invention is a high-performance and low-cost rare earth permanent magnet containing cerium. The rare earth permanent magnet is doped with a certain amount of high-abundance rare earth Ce in the neodymium iron boron magnet. Compared with the existing neodymium iron boron magnets on the market, the cost of raw materials is greatly reduced, but the magnetic properties of the permanent magnet can still be maintained without reduction, and it has significant cost and price advantages.

The invention belongs to the technical field of casting, and particularly relates to a fine ellipsoidizing method for a high-niobium and high-nitrogen nickel-based alloy NbN precipitated phase, a trace amount of rare earth Ce element is introduced in the smelting process, precipitation of an irregular large-size NbN phase in the high-niobium and high-nitrogen nickel-based alloy can be effectively controlled, the NbN remelting difficulty during homogenization is reduced, and the high-niobium and high-nitrogen nickel-based alloy is obtained. And control over the crack sensitivity of the casting blank in the die casting and hot rolling processes is facilitated. In addition, the method is high in transportability in the casting process of other high-niobium metal and has a good application prospect.

The invention provides a medium-strength high-conductivity die-casting aluminum alloy and a preparation method, and belongs to the technical field of high-pressure die-casting aluminum alloys. Wherein the aluminum alloy comprises the following components in percentage by weight: 1.0 to 4.0 percent of Fe, 0.05 to 0.85 percent of Ni, 0.1 to 0.78 percent of La and Ce, at most 0.05 percent of single impurity element, and the balance of Al. The aluminum alloy adopts specific Fe, Ni, La and Ce elements in percentage by weight, and Mn, Cr, V and Ti elements are strictly controlled, so that the tensile strength reaches 150-180 MPa, the yield strength reaches 70-90 MPa, the ductility reaches 15-20% and the conductivity reaches 50-59% IACS in an as-cast state, and the aluminum alloy has excellent conductivity and far exceeds the strength of pure aluminum; the aluminum alloy material provided by the invention is relatively low in Ni content, so that the material price is greatly reduced, and large-scale application of a high-conductivity material is promoted.

The invention relates to a high-conductivity semi-hard aluminum alloy material as well as a preparation method and application thereof. The high-conductivity semi-hard aluminum alloy material comprises the following alloy elements in percentage by mass: 0.02-0.04% of B, 0.20-0.30% of Zr, 0.10-0.20% of La, 0.15-0.25% of Ce, less than or equal to 0.01% of (Ti + V + Cr + Mn) and the balance of aluminum and other inevitable trace impurity elements. Through the composite addition alloying design that the B element, the Zr element, the La element and the Ce element are added into the aluminum alloy, an Al3X strengthening phase is generated under a certain preparation technology, and the electric conductivity is improved on the basis that the strength and the heat resistance are guaranteed. The preparation method of the high-conductivity semi-hard aluminum alloy monofilament comprises two stages of aging treatment, in the first stage of aging treatment, heat preservation is carried out for 0.5-1 h at the temperature of 300-325 DEG C, in the second stage of aging treatment, heat preservation is carried out for 1-2 h within the range of 200-230 DEG C, and then room temperature cooling is carried out, due to the two stages of heat treatment, the precipitation speed is increased, the evolution process of a precipitated phase is changed, and finally the aluminum alloy monofilament with good comprehensive performance is obtained.

The invention provides a magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following elements in percentage by mass: 2.0 to 4.5 percent of Zn element, 1.0 to 2.5 percent of Sm element, 0.5 to 1.5 percent of Cu element, 0.1 to 0.6 percent of Ce element, 0.1 to 0.5 percent of A element, less than or equal to 0.15 percent of inevitable impurities and the balance of Mg element, wherein the element A is selected from any one or more of Ca element, Sr element and Zr element; the heat conductivity of the magnesium alloy ranges from 130 W / (m.K) to 142 W / (m.K), the tensile strength ranges from 260 MPa to 285 MPa, the yield strength ranges from 150 MPa to 170 MPa, and the ductility ranges from 10% to 15%. The magnesium alloy disclosed by the invention has relatively high heat conductivity and relatively high strength, so that the requirement of a high-power integrated light-weight electronic component heat dissipation piece is met.

The present application relates to the technical field of steel continuous casting, and particularly relates to a low-reactivity continuous casting protective slag for rare earth steel with high rare earth content and a preparation method thereof. The continuous casting protective slag of the present application comprises the following components in terms of mass fraction: CaO 16-22%, SiO2 22-28%, Al2O3 4-5%, MgO 1-2%, Na2O 9-12%, F ‑ 18-20%, Ce2O3 5-20%, and C 6-8%, and the rest is inevitable impurities. The continuous casting protective slag of the present application has suitable melting temperature, viscosity and surface tension, and the addition of rare earth oxide Ce2O3 can effectively inhibit the reaction between the Ce element in the molten steel and the components of the protective slag, and can be well applied to the rare earth steel with the Ce content in the range of 0.02-0.03%. After use, the physicochemical properties of the protective slag remain stable, and the continuous casting process is effectively ensured to run smoothly and the surface quality of the casting blank is ensured.

The invention provides a copper alloy pipe and a preparation method thereof. The copper alloy pipe is prepared from the following elements in percentage by mass: 0.5 to 2.1 percent of Al element, 0.5 to 2.0 percent of Si element, 0.5 to 2.0 percent of Ni element, 0.05 to 0.08 percent of Ce element, 0.05 to 0.1 percent of Cr element, 0.05 to 0.08 percent of V element, less than or equal to 0.02 percent of inevitable impurities and the balance of Cu element, an alpha phase and a beta phase exist in the copper alloy pipe, and the mass ratio of the alpha phase to the beta phase is (40-80): (20-60). The copper alloy pipe can give consideration to high strength, high conductivity and corrosion resistance, directional regulation and control of the double-phase proportion can be achieved by controlling the mass ratio of the alpha phase to the beta phase, optimization and adjustment are conducted according to the strength and conductivity requirements, and then the copper alloy pipe can be better applied to sea optical cable connecting pieces, underwater equipment connectors and other use scenes.

The present invention belongs to the field of nanostructure preparation and discloses a rare earth Ce-doped Ni5P4 porous nanosheet array, its preparation method, and application. The present invention provides a method for improving the catalytic activity of nickel-based phosphides by heteroatom doping. By introducing heteroatom Ce, the intermediate adsorption / desorption behavior and electronic structure of the catalyst can be effectively adjusted, thereby achieving the effect of improving catalytic performance. The preparation process of the present invention is simple and easy, and the purpose of improving catalytic performance can be achieved by combining a coprecipitation reaction with a low-temperature phosphating treatment. The doping amount of the Ce element in the Ni5P4 porous nanosheet can be controlled by the addition amount of the Ce source, and the nanosheet can be used as an excellent bifunctional electrocatalyst in the electrocatalytic complete water splitting reaction.

The invention discloses an IWCO composite target material and a preparation method thereof, and belongs to the technical field of transparent conductive oxide target materials. The method comprises the following steps: providing In2O3 powder, WO3 powder and CeO2 powder according to an atomic ratio of In: W: Ce of 1: (0.03-0.07): (0.02-0.04); carrying out plasma activation treatment on the WO3 and CeO2 powder to obtain active composite powder; dissolving In2O3, mixing with the active composite powder, generating a ternary coprecipitate through a coprecipitation reaction, washing, drying, calcining and converting into IWCO precursor powder, and grinding and granulating to obtain IWCO particles; carrying out gradient pressure forming to obtain a biscuit; and finally, the IWCO composite target material is prepared through a step-by-step sintering process including air degreasing, inert atmosphere presintering, reducing atmosphere hot-pressing densification sintering and air annealing. According to the method, Ce element atomic-level uniform solid solution is achieved through activation, coprecipitation and calcination, and the segregation degree is smaller than or equal to 0.4 at%; the sintering temperature is reduced by 120-180 DEG C in combination with step-by-step sintering, and the W volatilization rate is smaller than or equal to 0.7 The relative density of the obtained target material is greater than or equal to 99.2%, the resistivity is less than or equal to 1.9 * 10 <-4 > omega.cm, and the target material is suitable for photoelectric devices such as HJT solar cells and flexible OLEDs.

The application discloses a vacuum die-casting motor rotor casting aluminum alloy and a preparation method thereof. According to mass percentage, the vacuum die-casting motor rotor casting aluminum alloy comprises the following components: 3.0-6.5% of Ni elements, 0.3-1.0% of Fe elements, 0.2-0.4% of Mg elements, 0.02-0.1% of B elements, 0.1-0.6% of Ce elements, and the rest is Al, and the rest is impurity elements; wherein, the content of a single impurity element is less than 0.03%, and the total content of the impurity elements is less than 0.2%.

The high-strength extruded magnesium alloy comprises the following components in percentage by weight: 0.25 to 1.45 percent of Ce element, 0.5 to 2.5 percent of Yb element, 1 to 2 percent of Sn element, 1.35 to 1.95 percent of Al element and the balance of metal Mg and some inevitable impurity elements. After the high-strength extruded magnesium alloy is subjected to extrusion and aging treatment, the tensile strength and the elongation of the magnesium alloy at the temperature of 275 DEG C are 373 MPa and 15.6% respectively, and the tensile strength and the elongation of the magnesium alloy at the temperature of 300 DEG C are 321 MPa and 18.3% respectively. The high-strength extruded magnesium alloy has excellent tensile strength, high heat resistance and good formability, and the technical problems that an existing magnesium alloy is not high in strength, poor in heat resistance and not prone to forming machining are solved.

The invention discloses a low-loss rare earth pyrochlore-based microwave dielectric ceramic material and a preparation method thereof, the chemical formula of the low-loss rare earth pyrochlore-based microwave dielectric ceramic material is Nd < 2-x > Gd < x > Ce < 2-y > GeyO7, x is more than or equal to 0.04 and less than or equal to 0.08, and y is more than or equal to 0.01 and less than or equal to 0.04. The preparation method comprises the following steps: weighing CeO2, Nd2O3, Gd2O3 and GeO2 according to a stoichiometric ratio, and carrying out primary ball-milling mixing; drying, calcining, preserving heat and cooling along with a furnace; carrying out secondary ball milling and drying; and sintering, preserving heat at low temperature and cooling along with the furnace. The synthesis of the (Nd, Gd) 2 (Ce, Ge) 2O7 solid solution is realized through an A and B site synergistic modification strategy, the loss characteristic of the rare earth pyrochlore ceramic material is improved, and the Q * f value of the ceramic material is increased; the valence state change of the Ce element can be inhibited, the structure defect is reduced, and the sintering compactness of the material is ensured.

The invention relates to a preparation method of a high-strength heat-resistant aluminum alloy for enhancing heat resistance by using a rare earth Ce element, and the preparation method comprises the following steps: (1) melting commercial pure aluminum to 740 DEG C to obtain an aluminum melt; (2) Cu, Mn, Zr and Ce elements are added into the aluminum alloy melt in the mode of adding intermediate alloy or simple substances, the aluminum melt needs to be subjected to slagging-off treatment before adding, stirring or ultrasonic treatment needs to be carried out after all the components are added so as to ensure that the components of the melt are uniform, heat preservation is carried out for 20 minutes at the temperature of 690 DEG C to 720 DEG C, then a refining agent is added for treatment, and the refining agent is added for refining; after refining is finished, the melt is immediately subjected to slagging-off treatment; and (3) rapidly pouring the alloy melt into a mold, preheating the mold to 250-350 DEG C in advance, and cooling to obtain the alloy. The aluminum alloy casting part produced by the method can have excellent high-temperature-resistant mechanical property in a temperature environment of 250-350 DEG C.

The application discloses a rare earth cerium micro-alloyed high-entropy alloy material and a preparation method thereof, and belongs to the technical field of rare earth alloy new materials. The method takes FeCoCrNiMn high-entropy alloy with an atomic ratio of 1:1:1:1:1 as a matrix, and adds 0.01%-0.1% of rare earth Ce elements in mass percentage; the alloy ingot is cast by vacuum induction melting and under the condition of circulating water cooling; then, the alloy ingot is subjected to homogenization annealing, secondary cold rolling and three times of annealing treatment, so that the rare earth cerium micro-alloyed high-entropy alloy material is obtained. The method significantly improves the strength and toughness of the alloy by combining the rare earth cerium micro-alloying with the multi-stage cold rolling and annealing process. The yield strength of the obtained high-entropy alloy is increased by 127 MPa at most, the tensile strength is increased by 164 MPa at most, and the fracture strain rate is increased by more than 2%. The method is stable in process, simple in operation and suitable for large-scale production.

The present application relates to the technical field of H13 steel chemical heat treatment, in particular to a method for preparing a diffusion layer by ion implantation Fe-Ce alloy assisted plasma nitriding of H13 steel and application thereof, first, the H13 steel is polished, then different doses of Fe-Ce elements are implanted on the surface of the H13 steel by ion implantation technology, and finally the implanted H13 steel is subjected to plasma nitriding. The purpose of the present application is to use high-energy ion implantation technology to preposition crystal defects such as vacancies and dislocations on the surface of H13 steel, promote the adsorption of nitrogen and facilitate solid solution strengthening, so as to improve the surface hardness; selecting Ce element implantation can reduce the energy barrier of N diffusion to the surface of iron, improve the thickness of the diffusion layer and accelerate the nitriding efficiency; therefore, under the same nitriding conditions, ion implantation Fe-Ce can realize thicker diffusion layer and higher surface hardness, which is helpful to improve the mechanical and friction and wear properties of H13 steel, and is applied to the mold of key parts in the production of automobile, aerospace and precision instrument field.

The invention relates to the technical field of railway steel production, and particularly discloses a Si-RE synergistically modified electric arc spraying zinc-aluminum-magnesium coating steel rail and a preparation method thereof.The preparation method comprises the steps that the steel rail is pretreated, and a clean steel rail with the cleanliness and roughness meeting the requirements is obtained; alloy coating spraying is conducted on the clean steel rail, and a coated steel rail is obtained; rare earth zinc aluminum magnesium alloy wires are adopted for alloy coating spraying and comprise Al, Mg, Si, Ce, Ti and the balance Zn. By adding trace Si and Ce elements into the alloy coating, the density of the coating is increased, the porosity of the coating is effectively reduced, the hardness, wear resistance and corrosion resistance of the coating are enhanced, hole sealing treatment does not need to be conducted again, the process is environmentally friendly, the prepared alloy coating is low in surface porosity and has the self-repairing capacity, and the service life of the alloy coating is prolonged. The steel rail has high binding force and excellent corrosion resistance, the service life of the steel rail can be remarkably prolonged, and a powerful guarantee is provided for railway transportation safety.

The invention discloses a preparation method of Nb and Ce co-doped WO3 photonic crystal special electrochromic glass, and relates to a preparation method of WO3 photonic crystal electrochromic glass. The invention aims to solve the technical problems that the response speed, the modulation range and the cycle life of WO3 are difficult to consider by the existing single element doping, and the existing preparation method is low in efficiency and high in cost. The intrinsic electrochemical performance of the WO3 material is optimized through synergistic doping of Nb and Ce elements, and meanwhile, the WO3 film with a highly-ordered three-dimensional photonic crystal structure is efficiently and controllably prepared through an innovative gradient temperature control-directional gravity settling method. The invention aims to solve the problems of poor orderliness of photonic crystals, low film forming efficiency and unbalanced WO3 electrochromism performance (that is, response speed, optical modulation range and cycling stability are difficult to consider at the same time) in the traditional method, and finally the electrochromism special glass with excellent comprehensive performance is obtained.

The invention discloses a pearlitic steel rail and a welding method of a joint thereof, the pearlitic steel rail is added with a specific amount of Ce element, and a specific joint welding method is adopted, so that the rail bottom pushing convex crack size of the obtained steel rail joint is reduced from more than 156 [mu] m to less than 25 [mu] m, and the average size of the pushing convex crack is reduced by more than 80%; the other structure properties of the joint meet TB / T 1632, meanwhile, the properties are remarkably improved, the average impact property is larger than 12.6 J, and the average hardness of the section hardness of the welded joint reaches 94%-98% of the average hardness of base metal.

The invention relates to a sputtering deposition insulating coating and a preparation method thereof, and belongs to the technical field of insulating coatings. According to the method, the metal matrix is subjected to electrochemical polishing, the smooth and flat pretreated metal matrix with certain roughness is obtained, then the Cr-Ce alloy coating is deposited on the surface of the pretreated metal matrix in a sputtering mode, the mass fraction of the Ce element in the Cr-Ce alloy coating is controlled, and therefore the Cr-Ce alloy coating can be obtained. By means of the method, it can be ensured that the Cr-Ce alloy coating and the pretreated metal matrix have high bonding strength, the Cr-Si-C insulating coating can be well attached to the surface of the Cr-Ce alloy coating, and then the service life of the insulating coating is prolonged. The prepared sputtering deposition insulating coating shows good insulating performance, and the bonding strength between the insulating coating and the stainless steel substrate is large.

The invention provides an amorphous alloy with high oxidation resistance and corrosion resistance, the composition of the amorphous alloy is (Zr, Hf, Ti) a (Cu, Ni) b (Al, Be) c (Nb, Fe) dRee, a, b, c, d and e are atomic percentages corresponding to the elements, the sum of a, b, c, d and e is 100, the atomic percentages corresponding to the elements are 42 < = a < = 65, 20 < = b < = 45, 11 < = c < = 18, 3 < = d < = 5, 0.05 < = e < = 0.5, and Re is one of Y, Pr, La and Ce elements. The invention further provides a preparation method of the amorphous alloy. The preparation method comprises the following steps: weighing raw materials according to the composition of the amorphous alloy; uniformly mixing the raw materials, putting the raw materials into a vacuum smelting furnace in sequence, and smelting until the melt is uniform; and the required amorphous alloy is obtained after cooling. The invention aims to provide an amorphous alloy with high oxidation resistance and corrosion resistance and a preparation method thereof, and aims to solve the technical problem of insufficient oxidation resistance and corrosion resistance of the amorphous alloy in the prior art.

The invention relates to a preparation method for adding an atomic-scale Ce element into aluminum and aluminum alloy through a Ce-organic metal framework, which comprises the following steps: (1) fully mixing and dissolving (trichloromethyl) carbonate in a certain amount of ethanol aqueous solution to obtain a solution A, (2) fully mixing and dissolving soluble cerium salt in a certain amount of distilled water to obtain a solution B, and (3) adding an atomic-scale Ce element into the solution B to obtain a solution C; (3) stirring and adding the solution A into the solution B at room temperature, standing for 2 hours, centrifuging and washing with distilled water to obtain black powder C; and (4) the dried black powder C is coated with aluminum foil and added into pure aluminum or aluminum alloy melt, the melt temperature ranges from 690 DEG C to 760 DEG C, degassing and impurity removal are conducted on the melt, the melt is poured into a corresponding mold after even stirring is conducted, and the aluminum or aluminum alloy with the atomic-scale Ce element added can be obtained. Compared with the prior art, the Al-Ce intermediate alloy is directly added in a melt in an atomic-scale Ce mode, the processing flow of a traditional Al-Ce intermediate alloy is reduced, the preparation method is simple and mild, the adding amount of Ce can be obviously reduced, and the purposes of reducing cost and improving efficiency are achieved.

The invention discloses a multi-stage combined rolling method for stainless steel resistant to corrosion of sulfate reducing bacteria. The multi-stage combined rolling method specifically comprises the steps that a Cu and Ce element synergistically doped stainless steel cast ingot prepared through a medium-frequency induction melting method is put into a heat treatment resistance furnace for heat preservation, water quenching treatment, grinding, cleaning and blow-drying; rolling the pretreated stainless steel cast ingot for the first time; rolling the stainless steel cast ingot rolled for the first time for the second time; carrying out third rolling on the stainless steel cast ingot subjected to the second rolling; putting the stainless steel cast ingot subjected to three-stage rolling into a furnace for heat preservation, and carrying out acid pickling and passivating treatment; and the stainless steel cast ingot subjected to passivation treatment is subjected to cold rolling and polishing, and the sulfate reducing bacteria corrosion resistant stainless steel is obtained. According to the method, the problems that the Cu and Ce-containing stainless steel is poor in hot working performance, easy to crack and easy to corrode when serving in an extreme environment are solved, and meanwhile, the tensile strength and the elongation of the stainless steel are synergistically improved.

The invention discloses nitric oxide orange red fluorescent powder with high luminous efficiency and large particle size and a preparation method thereof, and belongs to the field of fluorescent powder. The general molecular formula of the fluorescent powder is Ca < 1-x-y > Li < x > Al < 1-x-y > Si < 1 + x + y > N < 3-y > O < y >: zCe < 3 + >, Ce enters a crystal lattice of Ca and serves as a light-emitting element and an activating agent, 0 lt; x is less than or equal to 0.3, 0lt; y is less than or equal to 0.3, 0lt; and z < = 0.05. The fluorescent powder is sintered twice, and the second sintering is that the first sintering material and the raw materials are mixed and then sintered. The relative intensity of the fluorescent powder corresponding to an absorption peak at 25 DEG C and g = 4.215 + / -0.005 in an electron spin resonance method is 4.5 * 10 < 6 > or less. The fluorescent powder has the advantages of uniform particles, large average particle size, high quantum efficiency and high thermal stability. The method is suitable for large-scale production, and regulation and control of the particle size and uniformity can be achieved by adjusting the raw material ratio.

The invention provides a rare earth Ce-based alloy rapid hardening sheet and a preparation method thereof. The chemical formula of the rare earth Ce-based alloy rapid hardening sheet is REaFe100-a-b-c-dAlbBcMd, wherein 13.5 < = a < = 15, 1.2 < = b < = 2.0, 5.2 < = c < = 5.6, 0.1 < = d < = 5, and 6.5 < = (b + c) < = 7.5. The raw materials are smelted into molten liquid, and then the molten liquid is cast to a rotating copper roller through a tundish to be rapidly solidified. According to the method, elements such as Al and B in the alloy are cooperatively adjusted, crystal forming energy and free energy are modulated, competitive growth of a main phase crystal and a rare earth-rich phase is controlled, and directional growth of the crystal of the rare earth Ce-based alloy in the rapid hardening process is formed; the main phase grows in an oriented mode to form columnar crystals, the rare earth-rich phase is not gathered and is thinly distributed on the surfaces of the columnar crystals, and an ideal microstructure is obtained. The Ce content of the columnar crystal rapid hardening sheet is 60 wt.% or above of the total rare earth content, and a new technical approach is established for solving the overstock problem of the high-abundance rare earth Ce element.