52 results about "Ce element" patented technology

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 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 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 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 relates to the technical field of stainless steel thin strip continuous casting, and provides a preparation method of a stainless steel thin strip based on Ce modification solid-solution-free gradient aging strengthening, which comprises the steps of molten steel component design, smelting, thin strip continuous casting, waste heat hot rolling and gradient aging treatment, the gradient aging treatment is cooperated by adding Ce element, the solid-solution annealing step is omitted, and the preparation process is simplified. Energy consumption is reduced, and short-process preparation of the high-strength and high-corrosion-resistance 304 stainless steel thin strip is achieved; the strengthening element Ce and Ni form an L12 type nano precipitate in a 304 matrix, the form, size and distribution of the L12 type nano precipitate can be optimized through gradient aging, and meanwhile the effect of improving corrosion resistance and oxidation resistance is achieved; double-roller thin-strip continuous casting is combined with waste heat single-pass hot rolling, solidification and deformation are completed at a time, primary structures are rapidly cooled and refined through continuous casting, and energy consumption is reduced through waste heat energy of waste heat hot rolling. And finally, gradient aging treatment is adopted, fine precipitated phases are preferentially precipitated, growth is controlled, the number density is adjusted, initial precipitation strengthening and later toughness recovery are considered through gradient heat treatment, and strength-ductility compatibility is achieved.

The invention provides a calcium-based CO2 adsorbent as well as a preparation method and application thereof, and relates to the technical field of calcium-based adsorbents. The adsorbent is prepared by performing ultrasonic pickling on the carbide slag and doping one or more metal elements of Ce, Mg, Zr and Mn, preferably, the Ce element is doped, and the effect is optimal when the doping proportion of CeO2 is 10-15%. According to the adsorbent prepared by adopting the preparation method provided by the invention, due to the introduction of the metal oxide with high tower temperature, the pore structure of the adsorbent is obviously improved, CaO particles can be effectively anchored and isolated by an interfacial effect formed by the metal oxide and CaO, and the reaction activity of the adsorbent is enhanced; in the cyclic CO2 trapping process, the sintering resistance characteristic and the cyclic trapping performance are remarkably improved.

The present invention relates to a sputtering-deposited insulating coating and a preparation method thereof, and belongs to the technical field of insulating coatings. The present invention obtains a smooth and flat pretreated metal substrate with a certain roughness by electrochemically polishing a metal substrate, and then sputter-deposit a Cr-Ce alloy coating on the surface of the pretreated metal substrate, and controls the mass fraction of the Ce element in the Cr-Ce alloy coating. This ensures that the Cr-Ce alloy coating and the pretreated metal substrate have a high bonding strength, and can make the Cr-Si-C insulating coating have good adhesion on the surface of the Cr-Ce alloy coating, thereby improving the service life of the insulating coating. The sputtering-deposited insulating coating prepared by the present invention exhibits good insulating properties, and has a large bonding strength between the insulating coating and the stainless steel substrate.

The invention relates to the related technical field of magnetic materials, and discloses a magnetic material formula and a preparation technology thereof.The magnetic material comprises, by mass, 0.85%-0.95% of B, 0.1%-0.3% of Cu, 0.5%-1% of Al, 0.5%-1% of Co, 0.1%-0.5% of Ga, 0.5%-1.5% of Ho, 0.2%-1% of Dy, 18%-25% of PrNd and 8%-10% of Ce. Compared with a traditional formula, the Ce element lower in price in the formula is greatly used, the cost price of the formula is greatly reduced, and the cost is reduced by about 10%; it is found that the comprehensive magnetic performance is optimal at the second-stage aging temperature of 520 DEG C, in a conventional magnet, a large number of CeFe phases can be formed in the magnet due to addition of a high Ce element, the comprehensive magnetic performance of the magnet is greatly damaged, the adverse effect of Ce element doping is eliminated to the maximum extent through the synergistic effect of multiple elements under the optimal technological condition, and the comprehensive magnetic performance of the magnet is greatly improved. And the amplitude is reduced by 10% under the condition that the magnetic performance is not influenced.

The application discloses a coating for improving the paint adhesion of a metal part of a distribution box, which is prepared by the following steps: depositing a first oxide layer on the surface of the metal, wherein the first oxide layer comprises Zn and Ce elements; depositing a second oxide layer on the surface of the first oxide layer, wherein the second oxide layer comprises Zn and Ce elements, and the molar ratio of the Zn and Ce elements in the first oxide layer is different from that in the second oxide layer; depositing a third oxide layer on the surface of the second oxide layer, wherein the third oxide layer comprises Zn and Dy elements; and depositing a fourth oxide layer on the surface of the third oxide layer, wherein the fourth oxide layer comprises Zn and Dy elements, and the molar ratio of the Zn and Dy elements in the third oxide layer is different from that in the fourth oxide layer. The coating can improve the paint adhesion to the metal substrate.

The invention discloses a preparation method of a GH4698 alloy bar for improving room temperature and impact performance. The preparation method comprises the following steps: preparing a high-temperature alloy ingot by adopting a vacuum induction and vacuum self-consumption double-vacuum melting mode; and the bar with the specification of phi 200mm is prepared by adopting a high-temperature homogenization and fast forging forming mode. According to the method, the high-performance GH4698 bar is creatively prepared by optimizing the Ce element content, purifying the impurity content of the grain boundary, not weakening the pinning effect of grain boundary carbide, reducing the crack cracking tendency of the grain boundary and remarkably improving the bonding strength of the grain boundary through the mode of double vacuum smelting, homogenization and fast forging forming; the problem that the warm tensile property and the impact property of the current GH4698 bar do not meet the technical requirements is solved.

The embodiment of the application discloses a chemical analysis method for residual cerium oxide of a glass substrate, comprising the following steps: placing the peeled glass substrate into an acidic solution and uniformly covering the surface of the glass substrate, taking out the glass substrate after standing and cleaning the surface of the glass substrate with ultrapure water, pouring the cleaned liquid into the original soaking hydrofluoric acid to form a soaking solution; transferring the soaking solution into a polytetrafluoroethylene digestion tank and placing it on an electric heating furnace for heating and drying, adding concentrated hydrochloric acid for multiple times for dissolving after the liquid is completely dried, and cooling and cleaning after dissolving to configure a solution; formulating a standard solution configuration table for the configured solution, measuring the Ce element concentration C Ce of the to-be-measured solution according to the element detection spectral line condition, and measuring the Ce element concentration C Ce0 of the reagent blank solution, wherein the method is used for pre-treating the glass, and the content of the residual cerium oxide on the surface of the glass substrate is rapidly analyzed after grinding.

The invention discloses a high-entropy rare earth cerate ceramic coating for shielding neutrons and X-rays and a preparation method of the high-entropy rare earth cerate ceramic coating, and belongs to the technical field of radiation protection materials. The general formula of the chemical composition of the coating is (Sm < 0.2 > Gd < 0.2 > Er < 0.2 > Tm < 0.2 > Yb < 0.2 >) 2Ce2O7, and the coating has an A2B2O7 type pyrochlore or defective fluorite structure. A site is formed by atomic-scale mixing of five rare earth elements including Sm, Gd, Er, Tm and Yb, the molar content of each element is 5%-35%, and neutron and X-ray shielding functions are synergistically exerted through high-entropy design; and B site is Ce element. The preparation method comprises the following steps: proportioning corresponding oxides in proportion, performing ball milling, performing high-temperature sintering to synthesize high-entropy ceramic powder, performing spray drying granulation, and performing deposition on the surface of a matrix treated by the NiCoCrAlY bonding layer by adopting an atmospheric plasma spraying technology to form the coating. Atomic-scale uniform distribution of multiple functional elements is achieved through high entropy, a shielding blind area of a traditional composite material is eliminated, and the coating has the advantages of efficient cooperative shielding, excellent anti-radiation stability and environment friendliness and is suitable for radiation protection in the fields of aerospace, nuclear energy, medical treatment and the like.

The present application relates to a kind of based on computational thermodynamics optimization rare earth Ce modified Al-Si-Mg base casting alloy heat treatment process method, belong to casting aluminum alloy heat treatment technical field.The steps of the method of the present application include: constructing thermodynamic database, the solid solution temperature curve of Mg2Si aging strengthening phase in the alloy to be handled, the equilibrium dissolution temperature of AlSiCe rare earth phase and the influence law of Ce element on Al matrix vacancy formation energy;Select temperature interval as solid solution treatment window, carry out solid solution treatment and quenching cooling to form supersaturated solid solution;Subsequently, artificial aging treatment is carried out, and the aging temperature is determined according to the influence law of the vacancy formation energy.The present application accurately determines the temperature window by thermodynamic calculation, which takes into account the full solid solution of Mg2Si phase and the thermal stability of AlSiCe rare earth phase, realizes the synergistic regulation of aging strengthening phase and rare earth phase, and effectively improves the comprehensive mechanical properties of alloy.

The application discloses a high-cerium-content and high-purity industrial pure iron smelting production method, and belongs to the technical field of special steel smelting in the steel metallurgy. The method realizes the "ultra-pure" pretreatment of the molten steel through a set of coupled process design, creates an "inert" environment for the addition of Ce, and then realizes the efficient and stable alloying of the Ce element through a unique addition time, mode and protection means, so that the high-cerium-content and high-purity industrial pure iron with the Ce content being greater than or equal to 0.50%, the total impurity content being extremely low and the composition being uniform is finally produced.

The invention provides an aluminum alloy and a preparation method thereof. The aluminum alloy comprises the following elements in percentage by mass: 12-16% of Ce element, 0.2-0.6% of Sc element, 0.4-0.8% of Zr element, less than or equal to 0.15% of inevitable impurities and the balance of Al element, wherein at the room temperature, the tensile strength of the aluminum alloy ranges from 500 MPa to 610 MPa, and the ductility ranges from 5% to 12%; at the temperature of 300 DEG C, the tensile strength of the aluminum alloy is 230-260 MPa, and the ductility is 8-15%; in the aluminum alloy, the mass content of an Al11Ce3 phase is 0.20%-0.28%, and the mass content of an Al3 (Sc, Zr) phase is 0.014%-0.020%. The aluminum alloy disclosed by the invention has excellent room-temperature mechanical properties and high-temperature mechanical properties, and can better meet the requirements of the aerospace field on the heat-resistant aluminum alloy.

The invention discloses a Ce-based rare earth permanent magnet and a preparation method thereof. The Ce-based rare earth permanent magnet has a chemical formula of REaFe100-a-b-c-dAlbBcMd according to atomic percent, wherein 13.5 < = a < = 17, 1.1 < = b < = 2.0, 5.2 < = c < = 5.6, 0.1 < = d < = 5, and 6.5 < = (b + c) < = 7.5. By controlling Ce-based rare earth alloy components and modulating the synergistic effect of Al, B and other elements, a columnar crystal and rare earth-rich intergranular phase non-aggregated rapid hardening sheet is prepared, and the permanent magnet is prepared through the processes of crushing powder preparation, oriented pressing and sintering. According to the method, the columnar crystal rapid hardening sheet can be obtained by using a small amount of or even not using rare earth elements such as Nd, Pr, Gd, Dy and Tb, the prepared permanent magnet is high in abundance rare earth Ce content, low in expensive rare earth elements such as Nd and Pr and higher in magnetic performance, the production cost of the permanent magnet can be greatly reduced, and a technical approach is established for balanced utilization of the rare earth elements and solving of accumulation of the Ce element.