862 results about "Mg alloys" patented technology

The invention relates to a magnesium/magnesium alloy biomedical appliance with compound coating and the preparation method thereof. The biomedical appliance comprises a magnesium/magnesium alloy matrix (1), a film (2) made of degradable high-polymer material on the surface of the magnesium/magnesium alloy matrix and an iron film (3) on the surface of the degradable high-polymer material; the preparation method comprises the following steps: firstly, the magnesium/magnesium alloy material is processed into a biomedical appliance in specific shape; secondly, the degradable polymer film is coated; and thirdly, the iron film is plated through magnetron sputtering. The magnesium/magnesium alloy biomedical appliance with compound coating has the advantages that not only the superior performances of metallic material and degradable high polymer material are maintained, but also the service life of the appliance is effectively prolonged, the operation is safe, and the medical clinical needs are met.

The invention relates to a hydroxyapatite coating magnesium alloy medical implantation material and a preparation method thereof. The hydroxyapatite coating magnesium alloy medical implantation material is characterized in that: the surface of a magnesium alloy substrate is attached with a hydroxyapatite coating layer. The preparation method of the hydroxyapatite coating magnesium alloy medical implant material can adopt the bionic solution growing method, the ion beam deposition method, the coating and sintering process, the plasma spray method, the discharge plasma sintering method or the electrophoresis deposition method. The magnesium alloy material with the hydroxyapatite coating structure which is provided by the invention can effectively slow down the degradation rate of the magnesium alloy; at the same time, the coating layer can not only have great tissue compatibility, but can also be conductive to connective tissue attachment and the growth of the bone tissues, improve the bone healing rate and shorten the healing time.

This invention discloses a surface treatment method for Mg-based material. The method comprises: (1) performing micro-arc oxidation treatment on Mg or Mg alloy work piece as the anode in a Cl--free alkaline micro-arc oxidation electrolyte; (2) activating; (3) performing preliminary chemical plating of Ni; (4) performing chemical plating of Ni; (5) performing thermal treatment. The micro-arc oxidation treatment comprises: (1) applying a positive pulse with an average current density of 5-20 A/dm2 until the voltage is automatically elevated to a critical value, and applying a constant working voltage of 50-80 V (total time = 5-30 min); (2) applying a positive pulse of 30-300 V and a negative pulse of 0-200 V with an average current density of 0.5-15 A/dm2 (total time = 10-60 min). The activation comprises: (1) performing anode alkaline coarsening treatment for 3-10 min; (2) performing surface activation treatment; (3) performing cathode alkaline electrification reduction activation treatment; (4) performing cathode acidic electrification dispergation activation treatment. The treated Mg alloy work piece has high corrosion resistance of ceramic materials and the properties and touch sense of metal materials.

The application relates to a stack-layered magnesium-air batteries, which is characterized in that a plurality of assembly units is connected in series or in parallel to form the stack layer structure, electrolyte is injected before using, the assembly unit comprises an isolation air feed plate, an air electrode, an isolation membrane, an anode; a plurality of units are repeatedly stacking ordered, winded integrally by a fastener, and assembled into a outer shell; liquid injection pores are disposed on the outer shell, an electrolyte storage slot is disposed on the bottom of the shell, wherein the liquid injection pore is also used as an air inlet pore; the anode is made form magnesium alloy; the electrolyte storage slot is pre-filled with water absorption material; the isolation membrane is made from water absorbing paper dried after water absorbing resin dipping; structure of the isolation air feed plate a hollow plate or a comb-shaped plate with sieve pores, which not only is used as the insulation between batteries, but also functions as a channel for delivering air from external space to the air electrode. The electrolyte needed for the batteries are inputted from the liquid injection pore, stored in the electrolyte storage slot, and distributed to each assembly unit by capillary action of the isolation membrane.

The invention discloses a magnesium alloy with zinc and nickel compound plating layers and a preparation method thereof. A zinc plating layer of the magnesium alloy is taken as a bottom layer with the width between 20 microns and 25 microns, a nickel plating layer is taken as a surface layer, and the total width of the zinc plating layer and the nickel plating layer is less than or equal to 40 microns. The method comprises the following steps: firstly, plating preliminary treatment, i.e. zinc is activated in an acid solution and then soaked in sulphate; secondly, zinc electrodeposition, i.e. after the zinc is soaked in the sulphate in the first step, the zinc layer of the magnesium alloy is electrodeposited; thirdly, nickel bright plating, i.e. the magnesium alloy which is nicely processed in the second step is brightly plated with nickel in a nickel plating solution; fourthly, sodium silicate water solution sealing. With the method, the obtained zinc plating layer is nicely combined with a base body, has uniform width and high corrosion resistance, can be taken as a protective plating layer to be singly used and can be also taken as a transition layer to carry out plating or chemical plating or other protective or decorative platings, and the nickel plating layer obtained from the zinc plating layer by plating is nicely combined with the zinc plating layer and is uniform, exquisite, bright and beautiful.

The invention relates to a magnesium alloy micro-arc oxidation electrolyte and a micro-arc oxidation method. The electrolyte comprises phytate (or phytic acid), a calcic electrolyte, and further one or more added electrolytes as follows: carbonate, silicate, boric acid or borate, and aluminate or aluminum hydroxide. The micro-arc oxidation method comprises the following steps of: pre-treatment; micro-arc oxidation; and post-treatment. The micro-arc oxidation electrolyte provided by the invention does not contain Cr<6+>, F<-> and PO4<3->, and even if strong base used is less, so that the environment is not polluted. The film obtained by the micro-arc oxidation method is smooth in surface, good in corrosion resistance and better in antibacterial performance and biological activity. According to the method, raw materials are easily available, and the method is suitable for industrialized production.

This invention provides a method for coating a ceramic film on a metal, which can form dense films on various bases of metals such as magnesium alloys. The formed ceramic film has excellent abrasion resistance, causes no significant attack against a counter material, and has excellent corrosion resistance. The method comprises electrolyzing a metallic base in an electrolysis solution using the metallic base as a working electrode while causing glow discharge and/or arc discharge on the surface of the metallic base to form a ceramic film on the surface of the metallic base. The electrolysis solution contains zirconium oxide particles having an average diameter of not more than 1 μm, satisfies the following formulae (1) to (3): 0.05 g/L≦X≦500 g/L (1), 0 g/L≦Y≦500 g/L (2), and 0≦Y/X≦10 (3); and has a pH value of not less than pH 7.0. In the formulae (1) to (3), X represents the content of zirconium oxide particles in the electrolysis solution; and Y represents the content of a compound of at least one element selected from the group consisting of Mg and the like, other than zirconium oxide.

An Al material clad Mg-base band is prepared from the Mg plate or Mg plate ingot as basic material and the cladding Al sheets through hot rolling or cold rolling to attach said Al sheets to both surfaces of basic material. It has high cold deformation power and anticorrosion ability.

An alloy and an implant having a three-dimensional structure based on such alloy. The alloy comprises a MgZnCa alloy containing nanosized precipitates being less noble than the Mg matrix alloy and having a Zn content ranging 0.1 wt. % Zn to 2 wt. % Zn and a calcium content ranging from 0.2 wt. % to 0.5 wt. %, and having less than 0.04 wt. % of one or more other elements with the remainder being Mg. For these micro-alloys, any second phase generated during the solidification process can be completely dissolved by a solution heat treatment. Finely dispersed nanosized precipitates can then be generated by a subsequent aging heat treatment step. These precipitates are used to “pin” the grain boundaries and to prevent the coarsening of the grain structure during further processing to achieve grain sizes below 5 μm.

The invention relates to a preparation method of a surface coating capable of lowering the degradation rate of a fully-degradable magnesium alloy vascular stent. The method comprises the following steps: preparing a silane coupling agent on a magnesium alloy surface in a way that a silane coupling agent and an organic solvent are mixed, the silane coupling agent is grafted to the magnesium alloy surface of a biodegradable vascular stent by adopting a dip coating method and heating and curing are performed to form a coating; and preparing a polymer coating on the surface pre-treated by the silane coupling agent in a way that a spin-coating method is adopted to coat a polymer on a sample surface treated by the silane coupling agent, vacuum drying is realized and the polymer coating is formed after solvent volatilization. Through the technical scheme, a strong binding force exists between the polymer coating on the magnesium alloy surface pre-treated by the silane coupling agent and the surface of the fully-degradable magnesium alloy vascular stent, so that the magnesium alloy base body is prevented from excessively quick degradation, and the biocompatibility is improved; and as the coating is completely degraded with the base body at last, no toxic or side effects are brought to a human body.

A Mg—Gd—Y—Zn—Zr alloy with high strength and toughness, corrosion resistance and anti-flammability and a process for preparation thereof are disclosed. The components and the mass percentages thereof in the Mg—Gd—Y—Zn—Zr alloy are: 3.0%≤Gd≤9.0%, 1.0%≤Y≤6.0%, 0.5%≤Zn≤3.0%, 0.2%≤Zr≤1.5%, the balance being Mg and inevitable impurities. The process for preparation thereof comprises: adding pure Mg into a smelting furnace for heating, then introducing mixed gases of CO₂ and SF₆ into the furnace for protection; adding other raw materials in sequence when the pure Mg is completely melted; preparing an ingot; conducting a homogenization treatment on the ingot prior to extrusion; conducting an aging treatment on the extruded alloy. A wrought magnesium alloy having superior overall performances and good fracture toughness, corrosion resistance and anti-flammability, with a small amount of rare earth element is obtained by adjusting the proportion of the alloy elements and by conventional casting, extrusion and heat treatment processes. The cost of the alloy is reduced while the strength of the alloy is maintained.

The invention provides a high-strength and high-elasticity-modulus casting Mg alloy and a preparation method thereof. The Mg alloy comprises 6-12wt% of Gd, 1-5wt% of Li, 1-5wt% of Y, 2-6wt% of Al, the balance of Mg and inevitable impurities, wherein the total content of Si, Fe, Cu and Ni in the impurities is smaller than 0.03wt%. The preparation method of the Mg alloy includes the sequential steps of vacuum melting and heat treatment. Compared with the prior art, the preparation method has the advantages that by adopting a vacuum induction melting furnace for melting, inclusions generated in the melting process are reduced, and the retention time of a melt at a high temperature is substantially shortened; the effects of solution strengthening and age hardening of the Mg alloy can be fully exerted under the optimized heat treatment process.

This invention relates to the manufacture of secondary batteries charged by Mg including electrode materials, electrolytic material and their preparation method in which the negative is made of Mg alloy with component of MgMxMy(o<x, y<0.5) alloy above binary (M is Ni, Cu, Ti, Co, Si, B etc.), the positive is made of nanometer degree M2Co2O4(O<z<2, O<t<3) or MoS2 and the liquid electrolyte is metal organic compound Mg(ZnBuCl2)2. The said battery system has balance of charge/discharge with open voltage of about 2.0 V.

A deironing boride flux for Mg-alloy contains magnesium chloride, potassium chloride, sodium chloride, calcium chloride, calcium fluoride, barium chloride, and boron oxide and/or sodium borate as deironing agent. Its advantages are high power removing impurities and Fe from molten Mg-alloy, easy separation, and low cost.

A fire-retarding paint for casting Mg-alloy with lost mould is prepared from magnesia sand powder, perlite powder, mica powder silica sol, white emulsoid, polyacrylamide, carboxymethylcellulose sodium, adsorbent and flame-retarding agent through preparing solution from adsorbent, carboxymethylcellulose sodium, polyacrylamide and water, and mixing with others. It can make the Mg-alloy casting havesmooth surface.

The invention relates to a medical degradable and absorbable Mg-Sr-Ca series magnesium alloy implant and a preparation method thereof. The medical implant is made of a Mg-Sr-Ca series alloy, wherein strontium is 0 to 5 percent (but not 0) of the weight of the Mg-Sr-Ca series alloy; calcium is 0 to 2 percent (but not 0) of the weight of the Mg-Sr-Ca series alloy; a small amount of one or more of trace elements, namely manganese, zirconium, tin, rare earth and yttrium may be contained, and are not more than 2 percent of weight of the Mg-Sr-Ca series alloy; and the balance is magnesium. In-vivo and in-vitro tests prove that the Mg-Sr-Ca series alloy implant is nontoxic, has high histocompatibility, and is a reliable biomedical implant material.

The invention relates to a magnesium alloy internal fixation and implant material used in orthopedic surgeries, which is characterized in that the pure magnesium is used as the substrate, and calcium and zinc elements are added into the pure magnesium; wherein, the zinc accounts for 2-5%, and the calcium accounts for 1-3%. The magnesium alloy internal fixation and implant material used in orthopedic surgeries has the advantages of enjoying favorable biocompatibility, excellent mechanical property and controllable degradation rate, and meeting the demands for internal fixation and implant materials in orthopedic surgeries, thus being particularly suitable for screw plate systems and intramedullary pin systems.

This invention involves a process of forming an oxide coating with dimples on Al, Mg and Ti alloys. The oxide coating with dimples on its surface is produced by the process consisting of an electrochemical etching on the surface of those alloys followed by plasma oxidation in an alkaline electrolytic solution using a high voltage power supply. The as-prepared coating has smooth surface finish and improved properties being suitable for wear and corrosion protection of materials which have contacts with each other. The present invention can also be applied onto Al—Si and Mg alloys for wear and corrosion-wear prevention of sleeveless aluminium and magnesium engines.

The invention relates to a degradable magnesium alloy implanting material for bone fixation and a preparing method of the degradable magnesium alloy implanting material. The implanting material is prepared from, by mass percent, 0.5-4% of Mg, 0.5-4% of Ag and the balance Y. The preparing method of the implanting material comprises the steps of ingot casting metallurgy, extruding, rolling and heat treatment. The prepared implanting material meets the requirement of plates, rods and profiles, wherein the plates, the rods and the profiles serve in biological fluid environments. By means of alloy materials, the good comprehensive mechanical performance needed by bone fixing materials is ensured, the beneficial effects of being capable of inhibiting bacteria, resistant to corrosion, free of cytotoxicity, good in biological mechanical property and the like are achieved, and the alloy materials can be degraded under the biological fluid environments. The implanting material can serve as bone nails or marrow nails or bone fraction plates or other various devices to be used under the medical conditions, and the comprehensive performance is good; and especially, the implanting material has both the biomechanical property and the biodegradable performance at the same time, and the typical defect of existing metal materials of a titanium alloy or stainless steel or high polymer materials in application of the department of orthopaedics is overcome.

The invention relates to a plating assistant agent for zinc-aluminum-magnesium alloy hot dipping for a steel wire and belongs to the technical field of steel and iron material surface plating processes. The plating assistant agent is composed of 35-45 percent of ZnCl2, 2-10 percent of NaF2, 0.5-3.5 percent of CeCl2, 4.5-8.5 percent of SnCl2, 0.5-2 percent of H2O2, 0.1-05 percent of a surfactant and water in balancing amount. The surfactant is fatty alcohol ether sodium sulfate and/or sodium dodecyl sulfate. According to the invention, through a reasonable plating assistant agent formula, zinc-aluminum-magnesium alloy plating is obtained on the surface of the steel wire through hot dipping. The plating and the steel wire keep original performance respectively, more than 99.9 percent of a metallurgical bonding interface is obtained, the plating is compact in structure, plating leakage is avoided, and a zinc-aluminum-magnesium ternary eutectic with excellent corrosion resistance is formed. The corrosion resistance performance of the alloy plating is 2-4 times than that of normal hot-dipped pure zinc plating. The plating assistant agent is low in cost, can be used repeatedly and facilitates industrial production.

The invention relates to the technical field of surface treatment of bio-medical metal materials, in particular to a hydrophobic composite biological activity coating on the surface of pure-magnesium or magnesium alloy and a preparation method of the hydrophobic composite biological activity coating. The method includes the technical processes of preparing a micro-arc oxidation coating on the surface of a magnesium matrix material firstly, preparing a hydroxyapatite coating on the basis of the micro-arc oxidation coating to form a composite active coating, and carrying out hydrophobic treatment on the composite active coating finally to form the hydrophobic composite biological activity coating. The hydrophobic composite biological activity coating on the surface of the magnesium alloy is composed of magnesium oxide, magnesium phosphate and hydroxyapatite and has a compact layer ranging from 5 micrometers to 10 micrometers and a band-shaped hydroxyapatite array, the contact angle of the coating and simulated body fluid is larger than 90 degrees, and the coating shows hydrophobicity. The hydrophobic composite biological activity coating has the beneficial effects of high corrosion resistance, good biocompatibility, good bone induction capacity and the like, and has the wide application prospect.

The invention relates to an organism implant, components thereof and a preparation method thereof. The organism implant is made of degradable magnesium alloy, and is particularly suitable for being used as a fixing buckle for fixing cruciate ligaments, the total mass of the components of the degradable magnesium alloy is 100%, the content of magnesium accounts for 96.49%-98.9%, the content of calcium accounts for 0.1%-0.5%, the content of zinc accounts for 1-3%, and the sum of the content of other impurities accounts for not more than 0.01%; and the degradable magnesium alloy is obtained by preparation methods of vacuum smelting, solid solution heat treatment, extrusion process and rotary forging process. According to the organism implant, the components thereof and the preparation methodthereof, the biological implant has the characteristics of high strength and low degradation rate, and is suitable for being used as a material of the organism implant.

A Mg-alloy radiator contains Mg (more than 85.6%), Al (2.5-9.7 %), Zn (0.2-1.0%), Mn (0.1-0.3%), Si (0-0.1%), Fe (0-0.005%), Cu (0-0.3%), Ni (0-0.002%), RE (1.5-3.0%) and impurities (0-0.002%). It is made up of Mg-alloy ingot through heating it to 250-400 deg.C and extruding out at 200-250 deg.C, 2-8m/min and 150-210 MPa. Its advantages are light weight and high heat radiating power.

The invention provides a treatment method for alloying the surface of a superhigh-strength aluminum alloy. The treatment method comprises the following steps: firstly, manufacturing a Cu-Cr alloy cast ingot of which the Cr content is 3-20 percent by using a vacuum induction smelting method; carrying out surface removal and grinding treatment and then fixedly mounting the Cu-Cr alloy cast ingot on a target device of vacuum magnetron sputtering equipment; mounting the aluminum alloy subjected to clean surface grinding treatment on a matched clamp and mounting the aluminum alloy into a vacuum chamber of the vacuum magnetron sputtering equipment; opening the vacuum magnetron sputtering equipment; plating a Cu-Cr alloy film with the thickness of 2-10mum on the surface of an aluminum alloy substrate; and feeding the surface-plated Ni-Cr alloy film into strong-current pulse electron beam equipment for carrying out surface alloying treatment on the electron beams. According to the method disclosed by the invention, a layer of Cu-Cr alloying layer with high microhardness and favorable wear resistance and corrosion resistance is formed on the surface of the aluminum alloy. The alloyed layer and an aluminum alloy matrix are better bonded; and the surface strength of the aluminum alloy can be effectively improved and the wear resistance and corrosion resistance of the surface of the aluminum alloy are improved.

The invention relates to a method for preparing a biodegradable magnesium alloy surface modification fluoridated hydroxyapatite coating. The method comprises the following steps of: pretreating a magnesium alloy substrate, wherein the adopted transfer solution is prepared from sodium dihydrogen phosphate dehydrate and calcium nitrate tetrahydrate; soaking a substrate sample obtained by pretreatment in the transfer solution for 5-100 hours, thus obtaining a calcium-phosphorus coating; soaking a calcium-phosphorus coating sample in an alkali fluoridated transfer solution for 10-48 hours, so as to obtain a fluoridated calcium-phosphorus coating, wherein the alkali fluoridated transfer solution is prepared from sodium hydroxide and sodium fluoride, the concentration of the sodium hydroxide is 3-4g/L, the concentration of the sodium fluoride is 4-5g/L, and heat treatment is not performed; performing heat treatment on the fluoridated calcium-phosphorus coating at the temperature of 300-350 DEG C for 2-5 hours, thus obtaining the fluoridated hydroxyapatite. According to performance detection, the fluoridated hydroxyapatite (FHA) coating prepared by combining a heat treatment process is shaped like a slender sheet and is divergently arranged from the center to the periphery; the electrochemical test proves that the self-corrosion potential of the substrate is improved through the FHA coating; the immersed corrosion experiment proves that an actual protective effect of the FHA coating on the magnesium alloy substrate is better than that of a fluoridated apatite (FA) coating.