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908 results about "Micro arc oxidation" patented technology

Micro arc oxidation (Microarc oxidation, MAO, Micro arc anodizing), also known as micro-plasma oxidation (Microplasma oxidation, MPO), which through a combination of electrolyte and corresponding electrical parameters, depended on impact of instantaneous high temperature & pressure generated by arc discharge,...

Method for preparing biomedical titanium and titanium alloy surface antibacterial coatings

The invention discloses a method for preparing biomedical titanium and titanium alloy surface antibacterial coatings. The method comprises steps of firstly, processing the surface of a biomedical titanium or titanium alloy sample to be processed, immersing the biomedical titanium or titanium alloy sample in a glycol aqueous solution containing soluble fluoride and performing an anode oxidation treatment; secondly, immersing the biomedical titanium or titanium alloy sample after being subjected to the anode oxidation treatment in a silver nitrate solution, taking out the biomedical titanium or titanium alloy sample, using ultraviolet light radiation to process the biomedical titanium or titanium alloy sample and obtaining the silver-carrying biomedical titanium or titanium alloy sample; and performing a micro-arc oxidation treatment for the silver-carrying biomedical titanium or titanium alloy sample, performing ultrasonic cleaning and vacuum drying and obtaining the antibacterial coatings. The nano precoating layer preparation, the silver-carrying treatment and a micro-arc oxidation technology are combined, then a large amount of silver can be fixed on the biomedical titanium and titanium alloy sample surfaces and can be released slowly for a long time, the antibacterial performance of titanium and titanium alloys is greatly improved, the antibacterial effect can be kept for a long time, and the bacterial infection caused by the fact that a titanium and titanium alloy apparatus is embedded in a human body is greatly reduced or avoided.
Owner:NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH

Method of preparing hydroxyl apatite bioceramic film by plasma micro-arc oxidization method

The present invention relates to a process for preparing hydroxylapatite bio-ceramic membranes at titanium or titanium alloy surfaces by utilizing differential arc oxidation process. Firstly, preparing electrolytic solution A by using calcium ion salts and phosphate radical ion-containing salts, or preparing electrolytic solution B by adding metal silver ions to the electrolytic solution A; or preparing electrolytic solution C by adding metal silicon ions to the electrolytic solution A; and then, selecting titanium or titanium alloy as anodes and putting them respectively into the electrolytic solution A, B and C, selecting the non-corrodible steel container for containing the electrolytic solutions as cathodes, controlling conditions such as impulse electrical source positive phase voltage, frequency for differential arc oxidation of titanium or titanium alloy, then hydroxylapatite bio-ceramic membrane layers possessing different performances are prepared. Said titanium based bio-ceramic compound material prepared according to said process possesses not only intensity and toughness of metals but also biological activity of hydroxylapatites, and is capable of being applied in the fields such as jackstraw chirurgery implantation body and tooth planting body.
Owner:QINGDAO UNIV OF SCI & TECH

Corrosion-resistant magnesium alloy bracket and preparation method thereof

InactiveCN101797191AThe degradation rate can be adjustedUniform growthStentsAnodisationPlasma electrolytic oxidationMicro arc oxidation
The invention discloses a corrosion-resistant magnesium alloy bracket and a preparation method thereof, which relate to a magnesium alloy bracket with a corrosion-resistant coating and the preparation method thereof. The bracket and the method solve the problems of low bonding strength between the coating and a substrate, poor corrosion-resistant lasting stability, low mechanical bearing capacity and poor bracket coordination and deformation ability of the traditional magnesium alloy bracket. The corrosion-resistant magnesium alloy bracket is prepared by growing a ceramic coating in situ on the surface of the magnesium alloy by a micro-arc oxidation process. The method of the invention comprises the following steps: 1, processing the magnesium alloy to make a net-like bracket and removing oil to obtain the magnesium alloy bracket; 2, performing the micro-arc oxidation reaction; and 3, cleaning and drying the bracket to obtain the corrosion-resistant magnesium alloy bracket. The product of the invention is high in hardness and relatively high in tenacity and can coordinate with a substrate bracket to deform; and the ceramic coating is insusceptible to falling off and is high in body fluid corrosion resistance, so life cycle of the embedded bracket can be prolonged to a maximum extent. The method is simple and low in cost and can realize mass production. The product of the invention is suitable for implants with complex shapes, such as brackets, and is convenient to promote and use.
Owner:HARBIN INST OF TECH

Method for preparing dense enhancement type ceramic membrane based on micro-arc oxidizing and laser remelting

The invention discloses a method for preparing a dense enhancement type ceramic membrane based on micro-arc oxidizing and laser remelting, and relates to a method for preparing a dense enhancement type ceramic membrane on the surfaces of light metals such as magnesium, aluminium and titanium and other alloys. The method is used for solving the problems that a micro-arc oxidizing surface treatment technology for preparing the dense enhancement type ceramic membrane on the surfaces of light metals such as magnesium, aluminium and titanium and other alloys cannot have low energy consumption and high membrane performance at the same time. The method comprises steps of: 1, pretreatment of basic materials; 2, working liquid preparation treatment; 3, micro-arc oxidation; and 4, laser remelting treatment of the micro-arc oxidation (MAO) membrane, and thus obtaining a sample piece of the dense enhancement type ceramic membrane. The prepared membrane has good binding force with a base body, dense tissues, low porosity, high hardness and good corrosion resistance and wear resistance; and the porosity of the membrane can be reduced to below 3%, the harness number can be improved by double times of the original MAO membrane which is not subjected to laser remelting treatment. The method can be used for preparing the dense enhancement type ceramic membrane on the surfaces of light metals such as magnesium, aluminium and titanium and other alloys.
Owner:HARBIN INST OF TECH

Preparation method of ceramic film through chemical conversion and micro-arc oxidation of aluminum and aluminum alloy

The invention belongs to the technical field of surface treatment, and relates to a preparation method of a ceramic film through chemical conversion and micro-arc oxidation of aluminum and aluminum alloy. The preparation method comprises: cleaning aluminum and aluminum alloy, and then carrying out chemical conversion treatment on the cleaned aluminum and aluminum alloy to generate chemical conversion film containing metal ions; and then placing the chemical conversion film in a micro-arc oxidation electrolyte and carrying out micro-arc oxidation treatment on the chemical conversion film to obtain dark micro-arc oxidized ceramic film. In the preparation method provided by the invention, different metal cations such as Mn<7+>, Mo<6+>, Ni<2+>, Ce<2+>, Co<2+> and Zr<2+> are introduced to formthe chemical conversion film containing the corresponding metal ion on the surfaces of the aluminum and aluminum alloy, then the chemical conversion film is placed in different micro-arc oxidation electrolytes, the micro-arc oxidized ceramic film with improved corrosion resistance is obtained by virtue of micro-arc oxidation treatment, and simultaneously the film is colored.
Owner:北京京磁电工科技有限公司

Bio-absorbable medical compound material and preparation method thereof

The invention discloses a bio-absorbable medical compound material and a preparation method thereof. In the invention, an absorbable high polymer material is taken as a substrate, and an oriented and dispersed array is formed in the substrate through magnesium alloy wires or fibers which are subjected to micro-arc oxidation, or a two-dimensional latticed structure or a three-dimensional latticed structure is formed by weaving the magnesium alloy wires or fibers in the substrate for enhancing the mechanical performance of the absorbable compound material; degradable polymer substrates such as polylactic acid and the like are mixed with the wild phases of the magnesium alloy wires or fibers, are molded or extruded into bars or plates under certain pressures, and are treated with subsequent machining, so that various degradable biological medical compound materials can be obtained. The method has the characteristics of mild processing condition and easiness for operating; the product has high mechanical performance, high biocompatibility and wide application prospect, and is suitable for orthopedic internal fixation products of various shapes; the production degradation is safe, stable and controllable; and the pain to a patient caused by secondary operation or advanced invalidation of the conventional orthopedic product is avoided.
Owner:SOUTHEAST UNIV

Preparation method of active antibacterial composite coating on surface of titanium and titanium alloy medical instrument

The invention discloses a preparation method of an active antibacterial composite coating on the surface of titanium and titanium alloy medical instrument. The method includes the following steps: firstly, carrying out ultrasonic washing on the titanium or titanium alloy medical instrument to be treated and then immersing the titanium or titanium alloy medical instrument in NaOH solution for alkali-heat treatment; secondly, carrying out microarc oxidation treatment on the titanium or titanium alloy medical instrument in an electrolyte solution which contains biological active elements and antibacterial ingredients; carrying out hydro-thermal treatment on the titanium or titanium alloy medical instrument, and finally drying under vacuum condition. In such a way, the active antibacterial composite coating can be obtained. In the preparation method, a nano-silver/ titanium dioxide composite antibacterial agent is adopted to form the antibacterial coating on the surface of titanium or titanium alloy matrix, and the antibacterial coating has long antibacterial effect to bacteria commonly seen at an operation wound of a person and has adhesion resistance to common inflammatory bacteria. Meanwhile, the active ingredients such as Ca and P in the coating can improve the biological activity and speeds up the osseointegration, and thereby the antibacterial performance, the clinical curing effect and the application range of the titanium and titanium alloy medical instrument are improved by a large margin.
Owner:NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH

Zinc-doped porous nano-titanium oxide coating and its preparation method

Belonging to the technical field of biomedical ceramic coatings and nano-materials, the invention relates to a zinc-doped porous nano-titanium oxide coating and its preparation method. The preparation method consists of the steps of: providing a zinc-containing electrolytic solution, and supplementing at least one electrolyte for assisting arc striking, and in the electrolytic solution, taking titanium or titanium alloy as the positive electrode and stainless steel as the negative electrode, conducting microarc oxidation treatment to the titanium or titanium alloy with a direct current pulse power supply, thus obtaining a coating with a porous nano-crystal structure, a pore size of less than 20micrometers and a surface crystal grain scale of less than 100nm. Specifically, the coating phase is anatase titanium oxide or a composite of anatase titanium oxide and rutile titanium oxide, and has zinc content of 0.01-50 wt%. The nano-titanium oxide coating of the invention has better biocompatibility than existing titanium oxide coatings. And osteoblasts on the surface of the coating have faster propagation rate and stronger vigor. Thus, the zinc-doped porous nano-titanium oxide coating in the invention can be used as a replacing material for positions such as thighbones, hip joints, dental implants and others that bear heavy loads.
Owner:SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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