603 results about "Mg alloys" patented technology

The invention discloses composite powder, a metal anti-corrosion coating composition, a preparation method of the metal anti-corrosion coating composition and a metal anti-corrosion method. Zn < 2 + > and imidazole ligands are self-assembled on the surface of GO in situ in DMF to prepare composite powder with stable pore channels and barrier and self-repairing functions, and the composite powder is dispersed in an epoxy matrix to prepare the coating. When the coating is damaged, the MOF releases Zn < 2 + > to form a passive film with the ligand, and the GO network delays medium diffusion and enhances mechanical properties. And the coating has remarkable salt mist resistance and self-repairing performance, and is suitable for corrosion prevention of metals such as steel, aluminum-magnesium alloy and the like.

The invention relates to the technical field of rotary furnaces, in particular to a continuous feeding and discharging rotary furnace for rare earth silicon magnesium alloy preparation, which comprises a bottom table and a barrel rotationally mounted on the bottom table, and further comprises a feeding mechanism, and the feeding mechanism comprises a feeding pipe fixedly mounted on the bottom table and positioned on the left side of the barrel; a plurality of spiral augers are evenly installed in the feeding pipe in the circumferential direction, and the feeding pipe is provided with a rotating assembly used for driving the spiral augers to rotate and a distance adjusting assembly used for periodically adjusting the distance between every two adjacent spiral augers along with rotation of the rotating assembly. Raw materials are conveyed into the barrel through mutual cooperation of the rotating assembly, the distance adjusting assembly and the anti-clamping assembly, in the feeding process, the distance adjusting assembly can periodically adjust the distance between the adjacent spiral augers along with rotation of the spiral augers, and the situation that the raw materials are clamped in the conveying process is prevented.

The invention relates to the technical field of metal material processing engineering, discloses a full-automatic full-process modeling method and system of crystal plasticity finite element model for laser welding weld, which adopts MATLAB to call ABAQUS and PYTHON for co-simulation programming. In this text, a full-automatic modeling method of the crystal plasticity finite element model for laser welding weld is proposed, and a one-key crystal plastic finite element model for laser welding weld is established based on EBSD experimental data. In addition, the full-process full-automatic modeling method of crystal plastic finite element for laser welding weld is universal, and can be used for the establishment of the crystal plasticity finite element model for the microstructure of the base material of aluminum alloy, titanium alloy, magnesium alloy, stainless steel and other materials.

The present invention relates to a medical magnesium rare earth alloy powder and a preparation method and application thereof, belonging to the technical field of metal additive manufacturing. It is used to solve the problem that the existing magnesium alloy powder is used for additive manufacturing of formed bone implants, which will lead to excessive degradation rate of magnesium alloy bone implants, decreased biocompatibility, poor corrosion resistance and antibacterial properties, and fail to meet the performance requirements of bone implants. A medical magnesium rare earth alloy powder, the composition by weight percentage is: Sc: 0.5-2.75%, Zr: 0-0.5%, Y: 4-7%, and the rest is Mg and non-removable impurity elements. The magnesium alloy powder of the present invention has high purity, few impurities, slight surface oxidation, is suitable for laser additive manufacturing, has no obvious component deviation, and is controllable in composition; the magnesium alloy bone implant obtained by additive manufacturing has good corrosion resistance, can continuously provide mechanical support, and the number of mechanical support days is ≥85 days, which is better than the performance requirements of bone implants in my country's medical industry.

The large-area contact type threaded degradable magnesium alloy aorta blood vessel anastomat comprises a conical inner ring, a conical outer ring and a sleeve outer ring which are sequentially arranged from inside to outside, a blood vessel clamping space is formed between the conical inner ring and the conical outer ring, and the conical outer ring and the sleeve outer ring are in threaded fit. The sleeve outer ring is rotated to adjust the size of the blood vessel clamping space. The blood vessel anastomosis device is simple in structure, reasonable in design and convenient to use, the size of a blood vessel clamping space is adjusted by rotating the conical outer ring and the sleeve outer ring, so that blood vessels are fixed, blood vessel anastomosis is rapidly achieved, meanwhile, the traditional outward turning type end face combination mode is avoided, the contact area between the blood vessels is greatly increased, and blood leakage is prevented.

The invention belongs to the technical field of insulation heat dissipation coatings, and particularly relates to a magnesium alloy high-pressure-resistance surface treatment liquid and a preparation method thereof. The coating comprises the following raw materials in parts by weight: 30-40 parts of organic silicon modified waterborne epoxy resin, 9-12 parts of modified hexagonal boron nitride, 10-15 parts of modified graphene, 2-4 parts of a curing agent, 0.5-2 parts of a flatting agent, 1-2 parts of a defoaming agent and 25-50 parts of acetone. A coating formed on the surface of a magnesium alloy base material through the magnesium alloy high-pressure-resistance surface treatment liquid has high volume resistance, high breakdown voltage resistance, high corrosion resistance and high heat conductivity coefficient, and the magnesium alloy high-pressure-resistance surface treatment liquid can be applied to the field of new energy and can also be applied to the fields of aerospace, 3C electronics and the like. And the market prospect is wide.

The invention discloses a biomedical magnesium-based composite material as well as a preparation method and application thereof, and belongs to the technical field of biomedical materials. The preparation raw materials of the biomedical magnesium-based composite material comprise nanometer manganese coated micron titanium particles and magnesium-zinc-zirconium alloy powder; the mass of the micron titanium particles accounts for 1%-5% of the mass of the magnesium-zinc-zirconium alloy powder, and the mass of the nano manganese accounts for 1%-2% of the mass of the magnesium-zinc-zirconium alloy powder; the magnesium-zinc-zirconium alloy powder contains 1wt%-6wt% of zinc, 0.5 wt%-1wt% of zirconium and the balance of magnesium; a nano-scale MnZn2 phase is formed in the biomedical magnesium-based composite material, and part of manganese exists in a magnesium alloy matrix formed by magnesium-zinc-zirconium alloy powder in a solid solution form; the magnesium-based composite material contains 5%-15% by volume of nano twin crystals. The magnesium-based composite material has excellent mechanical properties, corrosion resistance and good biocompatibility, and can meet the requirements of clinical application.

The present invention relates to the field of surface treatment technology, and in particular to a preparation method and application of a conductive anti-corrosion coating for a magnesium alloy bipolar plate, wherein the preparation method comprises the following steps: S1, mixing a conductive high molecular polymer, an adhesive and an organic solvent to obtain a coating; S2, coating the coating on the surface of the magnesium alloy to form a coating. The present invention uses a magnesium alloy with extremely low density as a substrate, and arranges a corrosion-resistant coating on the surface of the substrate. The corrosion-resistant coating uses a conductive high molecular polymer such as polyaniline as a matrix material. Polyaniline has corrosion inhibition behavior and anion exchange properties. While protecting the underlying metal substrate, it can exchange anions with chloride ions in a corrosive environment to inhibit the penetration of corrosive anions. At the same time, not only is an adhesive added to enhance the bonding strength between the polyaniline coating and the magnesium alloy and to bond the polyaniline particles, but nano-oxides are also added as corrosion inhibitors to further improve the corrosion resistance of the coating.

The invention relates to a method for preparing a heterostructure magnesium alloy based on low-temperature friction stir additive in the field of metal processing, and designs a high-quality and high-efficiency cooling tool, which mainly comprises the following steps: firstly, cooling alcohol to low temperature by using liquid nitrogen; then the magnesium alloy plate to be machined is fixed to a cooling tool in a lap joint mode, and the tool mainly comprises a device body (1), a cooling liquid inflow hole (2), a cooling liquid outflow hole (3), a workpiece containing groove (4), a liquid storage chamber (5), a pressing plate (6) and fastening screws (7); then low-temperature alcohol is introduced, an advancing path and technological parameters are set, first-layer stirring friction additive manufacturing is conducted, and in the machining process, a stirring head and a workpiece are always kept to be submerged in cooling liquid; then, the surface obtained after material adding is milled to be flat, a layer of plate is overlaid on the other unmachined surface again, and the plate is fixed into the workpiece containing groove; and finally, second-layer friction stir additive manufacturing is conducted on the other face of the plate according to the same parameters and the same path. The method can be suitable for additive manufacturing of low-melting-point metal such as magnesium alloy and aluminum alloy at the same time, the multi-scale gradient heterostructure magnesium alloy can be prepared at the same time, the preparation efficiency is improved, and high-quality and low-cost preparation of heterostructure materials is achieved.

The invention discloses a low-cost, flame-retardant, high-strength, high-thermal-conductivity and corrosion-resistant Mg-Al-Ca-Mn alloy and a preparation method thereof, relates to an Mg-Al-Ca-Mn alloy and a preparation method thereof, and aims to solve the problem that an existing magnesium alloy is difficult to meet the requirements of high plasticity, corrosion resistance, thermal conductivity and flame resistance at the same time. The invention provides a low-cost, high-strength, corrosion-resistant, heat-conducting and flame-retardant Mg-Al-Ca-Mn-X alloy, X is one or a combination of more of Y, Gd, La, Ce, Sm and Nd according to any ratio, the microstructure of the alloy is regulated and controlled through alloy component optimization, rare earth microalloying, a heat treatment process and a plastic deformation process, and the mechanical property of the alloy is improved. The alloy prepared by the invention has excellent mechanical property, corrosion resistance, heat-conducting property and flame retardant property. The method is applied to the field of metal materials.

The utility model relates to a magnesium particle preheating charging hopper for a magnesium alloy semi-solid forming machine, which comprises a shell (1), the shell (1) is funnel-shaped, a top cover (11) is arranged at the top opening of the shell (1), an interlayer (12) is arranged on the side wall of the shell (1), and the bottom opening of the shell (1) is used for being communicated with a charging barrel of the magnesium alloy semi-solid forming machine. One end of the top cover (11) is hinged to one side of the top of the shell (1), the other end of the top cover (11) is connected with the shell (1) in a clamped mode through a buckle (2), an exhaust port (111) is formed in the top cover (11), and a heating piece is arranged in the interlayer (12). The magnesium particle moisture removal device can remove moisture of magnesium particles added into the magnesium alloy semi-solid forming machine.

The invention relates to a multifunctional magnesium alloy coating with high biocompatibility and a preparation method and application thereof. Comprising the following steps: (1) carrying out surface treatment on a magnesium alloy substrate; (2) micro-arc oxidation treatment; (3) after preparing a coating solution, carrying out double-sided ultrasonic atomization spraying; and (4) drying, soaking and cleaning. According to the preparation method, a micro-arc oxidation treatment technology and a double-sided ultrasonic atomization spraying technology are combined for the first time, pores and cracks of the MAO coating serve as binding sites, effective loads are provided for the silk fibroin / nano-hydroxyapatite particle coating, the MAO coating and the SF / nHAp coating are fully combined, and the composite coating is prepared. According to the coating, the MAO coating and the SF / nHAp coating are combined for the first time, the defect of rapid degradation when the magnesium alloy serves as an in-vivo implant is effectively overcome, the corrosion resistance of the magnesium alloy is remarkably improved, the release rate of hydrogen after implantation is reduced, and rising of the pH value around the implant is slowed down.

The invention relates to the technical field of cardiovascular stents, in particular to an alloy cardiovascular stent and a surface coating process thereof. The preparation method comprises the following steps: performing electrolytic polishing, washing and drying on a magnesium alloy intravascular stent, immersing the magnesium alloy intravascular stent into a sodium hydroxide solution for alkali heat treatment, and washing and drying to obtain a pretreated magnesium alloy intravascular stent; immersing the pretreated magnesium alloy intravascular stent into a dopamine solution for reaction to obtain a polydopamine modified magnesium alloy intravascular stent; preparing a polymer coating on the surface of the polydopamine modified magnesium alloy intravascular stent by using a physical spraying method to obtain a polymer modified magnesium alloy intravascular stent; and immersing the polymer modified magnesium alloy intravascular stent into the nanoparticle solution, and carrying out ultraviolet irradiation, washing and drying to obtain the polymer modified magnesium alloy intravascular stent. The corrosion resistance of the magnesium alloy intravascular stent is improved, the degradation rate of the stent in vivo is effectively reduced, and the stent surface is endowed with good biocompatibility.

The invention discloses a multifunctional coating with a compact-porous double-layer structure on the surface of magnesium alloy and a preparation method, and belongs to the technical field of biological materials. According to the multifunctional coating, magnesium alloy serves as a substrate, a compact layer and a porous layer are sequentially stacked from the substrate to the outside, and the compact layer is composed of two-dimensional transition metal carbide / nitride, calcium silicate nanowires and a positively charged polymer. The porous layer is composed of copper-containing complex / biopolymer composite fibers, mineralized silk fibers loaded with bioactive metal ions and astragalus polysaccharide on the surface, and natural polymers. According to the multifunctional coating with the compact-porous double-layer structure prepared on the surface of the magnesium alloy, the porous layer on the surface layer has a unique porous structure, growth and proliferation of osteoblasts can be well promoted, meanwhile, the multifunctional coating has the characteristics of pressure resistance, bacteria resistance and oxidation resistance, the compact layer on the bottom layer can improve the corrosion resistance of the magnesium alloy, and the service life of the magnesium alloy is prolonged. The coating is particularly suitable for surface coating of magnesium alloy implant materials and can be used in the field of medical instruments.

The invention discloses a nanocarbon-copper heterogeneous interface construction method for improving the electromagnetic shielding and heat-conducting properties of a graphene / magnesium composite material and a composite material based on the nanocarbon-copper heterogeneous interface construction method, and belongs to the technical field of heterogeneous interfaces. The method comprises the following steps: mixing intrinsic graphene, a surfactant and a foaming agent, performing ultrasonic dispersion treatment in solvent water, and performing freeze drying to obtain an intrinsic graphene preform; performing chemical vapor deposition on the intrinsic graphene preform serving as a substrate, and performing in-situ deposition of nanocarbon on the surface of the intrinsic graphene preform to obtain an intrinsic graphene-nanocarbon preform; a copper-containing oxidizing agent and a reducing agent are added into ethyl alcohol for ultrasonic treatment, an ethyl alcohol solution is obtained, the intrinsic graphene-nanocarbon prefabricated body is added into the ethyl alcohol solution, standing and drying treatment are conducted, then heat treatment is conducted, and an intrinsic graphene-multi-dimensional nanocarbon-nanocopper prefabricated body is obtained; and heating is conducted under argon protection, a magnesium alloy matrix is placed on the intrinsic graphene-multi-dimensional nano carbon-nano copper prefabricated body for liquid-solid infiltration extrusion, and the intrinsic graphene reinforced magnesium-based composite material is obtained. The method is used for solving the problems that existing intrinsic graphene of a three-dimensional network structure cannot have excellent electromagnetic shielding performance and heat-conducting performance at the same time, and existing magnesium-based composite materials only conduct single electromagnetic shielding performance or heat-conducting performance regulation and control.

The invention discloses a magnesium alloy corrosion resistance prediction method based on machine learning, and relates to the technical field of metal material performance prediction.The method comprises the following steps that magnesium alloy corrosion resistance data are obtained and preprocessed, and a magnesium alloy data set is obtained; aiming at a random forest algorithm and a gradient boosting tree algorithm, training, optimizing and evaluating the prediction model by using the magnesium alloy data set to obtain an optimal prediction model; and for the optimal prediction model, inputting components and environmental parameters of the magnesium alloy, and outputting a corrosion resistance prediction value. According to the method, the prediction precision and the material design efficiency can be remarkably improved, the method is suitable for biomedical application of orthopedic implants, intravascular stents and the like, and an efficient and reliable technical path is provided for research and development of the degradable magnesium alloy.

The utility model discloses an electromagnetic compatibility assessment device, and belongs to the technical field of wireless communication. The equipment comprises a data processing module, a signal generator module, a low-frequency / high-frequency amplifier, a combining unit, a shielding frame and a power supply module, and accurate evaluation of the electromagnetic compatibility of the weak current equipment is realized through modular design. The signal generator module adopts a multi-band vector signal generator to generate configurable interference signals; the low-frequency amplifier and the high-frequency amplifier respectively adopt independent high-precision amplification circuits; and the combining unit couples the two paths of signals into a composite interference signal and outputs the composite interference signal. The shielding frame is made of double-layer aluminum magnesium alloy and is combined with a metal machine frame to form a composite shielding system. And the data processing module regulates and controls parameters in real time through the touch screen, analyzes response data of the tested equipment based on an FFT algorithm, and generates a visual evaluation report.

The invention discloses an ultrahigh-strength heat-resistant Mg-Gd-Y-Zn-Zr-Yb wrought magnesium alloy and a high-temperature extrusion forming process thereof, and relates to the technical field of non-ferrous metal materials and processing thereof.The ultrahigh-strength heat-resistant Mg-Gd-Y-Zn-Zr-Yb wrought magnesium alloy is prepared from, by mass, 8.96 wt%-9.33 wt% of Gd, 3.72 wt%-4.12 wt% of Y, 1.17 wt%-1.25 wt% of Zn, 0.24 wt%-0.35 wt% of Zr, 0.23 wt%-0.53 wt% of Yb and the balance Mg and inevitable impurities; the high-temperature extrusion forming process comprises the following steps of preparation of a high-quality casting blank through a semi-continuous casting technology, high-temperature long-time solution treatment, high-temperature reverse extrusion and isothermal aging treatment. Wherein high-temperature backward extrusion is carried out at 400 DEG C, the extrusion ratio is about 7, quenching is carried out in cold water after extrusion, and then aging treatment is carried out; according to the ultrahigh-strength heat-resistant rare earth magnesium alloy prepared through the high-temperature backward extrusion forming technology, the yield strength is larger than or equal to 456MPa, the tensile strength is larger than or equal to 509MPa, and the ductility is larger than or equal to 4.3%; the ultrahigh-strength heat-resistant magnesium extrusion rod is of great significance in promoting the application of magnesium alloy in the high-tech fields of aerospace, national defense and military industry and the like.

The invention belongs to the field of bladder cancer treatment, and particularly relates to a drug delivery system based on combination of a biodegradable magnesium alloy stent and a double-J tube. The system comprises a biodegradable magnesium alloy stent and a double-J tube, the surface of the biodegradable magnesium alloy stent is modified by a calcium phosphate coating to form a fine needle-shaped micro-nano structure, and the biodegradable magnesium alloy stent loads an anti-cancer drug oridonin. The biodegradable magnesium alloy stent loaded with oridonin is accurately attached to a tumor part by means of ultrasonic guidance, and the double-J tube and the biodegradable magnesium alloy stent are combined for use. According to the invention, the loading efficiency of the hydrophobic drug is improved through the modification of the micro-nano structure of the calcium phosphate coating, and the anti-tumor effect of the magnesium degradation product is cooperated, so that the problems of high frequency, high toxicity and poor compliance of traditional bladder cancer perfusion treatment and difficulty in delivery of Ori and other natural drugs are solved, and finally, accurate, long-acting and low-toxicity treatment of bladder cancer is realized.

The present invention discloses a reverse design method for high-performance magnesium alloys based on machine learning. By collecting data on the composition, processing technology and mechanical properties of magnesium alloys, the implicit structure-activity relationship of the composition, processing technology and mechanical properties of magnesium alloys is analyzed by machine learning algorithms, thereby realizing efficient design of new high-performance magnesium alloys based on mechanical performance requirements. The present invention combines an optimization algorithm with a forward model to optimize parameters such as alloy composition, effectively improve the accuracy of prediction (the calculation accuracy can reach 99%), reduce deviations (the error is only 0.5%), and can achieve good fitting effects even with a small amount of alloy data and complex process combinations. The calculation method is simple and easy to implement. The present invention improves the design efficiency of magnesium alloys, reduces experimental costs, and is a reverse design guided by actual performance requirements. It not only solves the problem of small amount of magnesium alloy data, but also provides a new idea for the efficient development and design of high-performance magnesium alloys based on machine learning methods.

The invention provides an electrode loaded with an amorphous catalyst as well as a preparation method and application of the electrode. The preparation method comprises the steps that aluminum metal powder and magnesium metal powder are subjected to first mixing, and mixed aluminum-magnesium powder is obtained; the mixed aluminum-magnesium powder is sprayed on the surface of at least one side of a metal nickel base material in a vacuum plasma spraying mode, and the metal nickel base material loaded with an aluminum-magnesium alloy transition layer is obtained; carrying out second mixing on the amorphous metal source and an auxiliary agent to obtain mixed amorphous powder; the mixed amorphous powder is sprayed on the surface of the side, away from the metal nickel base material, of the aluminum-magnesium alloy transition layer in a cold spraying mode, an amorphous catalyst layer is obtained, and then a first electrode is obtained; and sequentially carrying out heat treatment and alkaline leaching on the first electrode to obtain the electrode loaded with the amorphous catalyst. The aluminum-magnesium alloy transition layer is firstly prepared on the metal nickel base material, and then the amorphous catalyst layer is prepared through the cold spraying technology, so that the binding force between the amorphous catalyst layer and the base material is effectively enhanced.

The invention belongs to the technical field of material surface treatment, and particularly relates to a calcium-based phosphate hole sealing treatment method based on a biomedical magnesium alloy micro-arc oxidation coating. Carrying out micro-arc oxidation treatment on the magnesium alloy to obtain a micro-arc oxidation coating; and then hole sealing treatment is conducted in a hole sealing solution composed of calcium-based phosphate, the magnesium alloy surface micro-arc oxidation-calcium-based phosphate hole sealing composite coating is obtained, and the hole sealing solution is a mixed aqueous solution of soluble calcium salt, NH4H2PO4, NaNO3, C10H14N2Na2O8. 2H2O and H3PO4. After magnesium alloy is subjected to micro-arc oxidation treatment, a micro-arc oxidation coating formed on the surface has the defects of cracks, pores and the like, and the corrosion resistance of the coating is not facilitated. In order to further eliminate the influence of the defects in the coating, a novel calcium-based phosphate hole sealing treatment technology is adopted, so that the corrosion resistance of the coating can be remarkably enhanced, and the biocompatibility of the coating can be improved by introducing a calcium element.

The invention relates to the technical field of ion implantation, and discloses a method for implanting organic functional group ions into magnesium alloy, which comprises the following steps: preparing a magnesium alloy sample; surface pretreatment: coating a PLGA solution on the sample, and naturally drying to form a PLGA coating; fixing the sample on ion implantation equipment and then vacuumizing; precursor gas preparation: gasifying imidazole and conveying the gasified imidazole to an ion source area; ionizing the imidazole; the imidazole ions are accelerated to 80keV energy; ions are injected according to the injection dose of 1 * 1017 ions / cm < 2 > and the beam density of 1 [mu] A / cm < 2 >, and the injection depth is about 100 nm; and annealing treatment is conducted, and after annealing is finished, natural cooling is conducted to room temperature. The PLGA coating is coated on the surface of the magnesium alloy, so that the corrosion resistance and the biocompatibility of the magnesium alloy can be effectively improved, and the application range of the magnesium alloy in the field of biomedicine is expanded.

This invention relates to the field of magnesium primary battery preparation technology, and discloses a magnesium aqueous primary battery system, including a positive electrode, a negative electrode, and an electrolyte. The negative electrode is any one of magnesium metal and magnesium alloy. The positive electrode is made of a positive electrode active material, superconducting carbon, and a first-order gelatinizing agent. The electrolyte is made of magnesium bromide, a corrosion inhibitor, and a second-order gelatinizing agent. The preparation method includes the following steps: S1: preparing a positive electrode slurry; S2: preparing an electrolyte by introducing a corrosion inhibitor into the magnesium bromide electrolyte, followed by adding a second-order gelatinizing agent for gelatinization treatment to obtain a slow-release gelatinized electrolyte; S3: preparing a positive electrode steel shell; S4: assembling the battery. The technical solution of this invention not only slows down the corrosion rate of the negative electrode material and improves the utilization rate of the negative electrode material, but also solves the problems of voltage hysteresis and volume expansion during battery discharge; furthermore, it can match the reaction rates of the positive and negative electrodes.

The present invention provides a high-strength heat-resistant magnesium alloy with multiple precipitation phases and a preparation method thereof. The magnesium alloy is an Mg-A-B alloy, and the composition expression of the multiple precipitation phases is A x MgB y (where x and y are equal to 1 or 2), where both A and B are alloy element sets; according to the elements contained in the element sets and the precipitation phases of different lattice types formed by them, it can be specifically divided into face-centered cubic A2MgB type, face-centered cubic AMgB2 type, orthorhombic lattice AMgB type, hexagonal lattice AMgB type, and tetragonal lattice A2MgB2 type multiple precipitation phase strengthened magnesium alloys. The designed Mg-A-B alloy contains at least 5 elements; its microstructure has the following characteristics: (1) Nano-scale A x MgB y multiple precipitation phases are formed in the Mg matrix, and the average equivalent size is ≤20 nm; (2) A x MgB y multiple precipitation phases are not easily coarsened in a high-temperature environment, and the thermal stability of the alloy microstructure is strong. The room-temperature yield strength of the age-hardened peak-state magnesium alloy of the present invention is 300-550 MPa, the tensile strength is 350-600 MPa, and the elongation after fracture is 5-40%.

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 relates to the technical field of metal surface modification, in particular to a magnesium alloy anticorrosive coating and a preparation method and application thereof. The method comprises the following steps: firstly, performing micro-arc oxidation treatment on magnesium alloy to form a substrate layer; then, the micro-arc oxidation coating is subjected to hole sealing treatment through dendritic mesoporous silica loaded with a corrosion inhibitor, and the self-repairing function is given to the micro-arc oxidation coating; then, a layered self-similar coating composed of dendritic mesoporous silica loaded with a corrosion inhibitor and a resin matrix is constructed on the surface of the hole sealing layer, and interface bonding and compactness are enhanced; finally, dendritic mesoporous silica, cellulose nanocrystals, 1H, 1H, 2H, 2H-perfluorodecyl triethoxy silane, organic resin and tetraethoxy silane are introduced, and the super-hydrophobic coating with a micro-nano composite firm structure is formed on the surface layer. The obtained magnesium alloy anti-corrosion coating integrates the characteristics of long-acting corrosion resistance, super-hydrophobicity, self-repairing, high mechanical stability and the like, and the technical problems that a traditional magnesium alloy anti-corrosion coating is prone to physical or chemical damage and insufficient in durability are effectively solved.

The invention discloses a magnesium-titanium composite material with an interpenetrating phase structure for bone implantation, the magnesium-titanium composite material is formed by interpenetrating a reinforced phase made of a titanium alloy material and a matrix phase made of magnesium or a magnesium alloy material, and the reinforced phase and the matrix phase are respectively kept continuous in a three-dimensional space; a reinforcing phase and a matrix phase of the magnesium-titanium composite material have gradient structures in the radial direction; the invention further discloses a preparation method of the interpenetrating phase structure magnesium-titanium composite material for bone implantation. According to the magnesium-titanium composite material disclosed by the invention, the structure is designed into a structure in which the reinforcing phase and the matrix phase are three-dimensionally continuous and interspersed with each other and the two phases are in gradient in the radial direction, so that the magnesium-titanium composite material implant and healthy bone tissue at a bone defect part of a patient realize good biomechanical adaptation; the material is suitable for being used as a bone implant in the field of biomedical metal materials.

The invention discloses a composite coating modified medical magnesium matrix and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a silane hydrolysis solution with a nano calcium carbonate suspension to obtain a mixed solution; soaking the medical magnesium matrix pretreated by the layered double hydroxide coating in the mixed solution for 1-5 minutes, and then quickly taking out; and heating the impregnated medical magnesium matrix at the temperature of 80-150 DEG C to 45-80 DEG C to obtain the modified medical magnesium matrix. Firstly, a layered double hydroxide coating is generated on the surface of medical magnesium or magnesium alloy through a hydrothermal method, and then a nano calcium carbonate composite silane coating is prepared on the layered double hydroxide coating, so that the corrosion resistance of a matrix is improved, and meanwhile, due to compounding of nano calcium carbonate, the biocompatibility and osteogenesis performance of the matrix are improved.

The invention discloses a high-forming-quality easy-to-evaporate light alloy laser additive and a manufacturing method thereof. The high-forming-quality easy-to-evaporate light alloy laser additive comprises a light alloy matrix and a micron-sized ceramic reinforced phase dispersed in the light alloy matrix. The light alloy matrix is magnesium alloy or aluminum alloy; the micron-sized ceramic reinforced phase is TiC, the TiC ceramic reinforced phase accounts for 2-6wt.% of the content of the light alloy matrix, and the micron-sized ceramic reinforced phase TiC is tightly adhered to the surface of the light alloy matrix powder through a low-energy ball milling method. Due to the low melting point, metal elements such as magnesium and aluminum in the light alloy are prone to evaporation under irradiation of high-energy laser beams, metallurgical defects such as splashing and air holes are formed, and therefore the forming quality and the mechanical property of the light alloy are reduced. By adding a proper amount of matched reinforcement phase, the momentum of easily evaporated light alloy powder such as magnesium alloy and aluminum alloy in the laser forming process is reduced, alloy powder splashing is reduced, the forming quality of the alloy is improved, the effect of improving the laser forming property and mechanical property of the light alloy is achieved, and finally the light alloy with high forming quality and high performance is obtained.