328 results about "Plasma flame" patented technology

The ultrafine particle producing process introduces materials for producing ultrafine particles into a thermal plasma flame under reduced pressure to form a vapor-phase mixture, introduces a reactive gas and a cooling gas toward an end portion of the thermal plasma flame in supply amounts sufficient for quenching the vapor-phase mixture to generate the ultrafine particles and allows the resultant ultrafine particles to come into contact with the reactive gas so as to produce the ultrafine particles whose surfaces are coated with a thin film including one or more components compound derived from decomposition and/or reaction of the reactive gas, for example, an elementary carbon substance and/or a carbon. According to the process, thin film-coated ultrafine particles having high level uniformity in particle size and shape can be produced.

The invention relates to manufacturing glass fiber preforms. It relates to a method comprising rotating preform about its own axis, and displacing a plasma torch in translation relative to the preform in a direction parallel to the axis of the preform, the axes of the flame and of the preform and being offset by a certain distance, and then inserting glass powder into the plasma flame under gravity. According to the invention, the glass powder is accelerated before penetrating into the plasma flame by means of an accelerator gas, and the offset distance between the axes is reduced with increasing acceleration of the powder. The invention is applicable to manufacturing glass fibers, and in particular optical fibers.

A method and apparatus for producing metastable nanostructured materials employing a ceramic shroud surrounding a plasma flame having a steady state reaction zone into which an aerosol or liquid jet of solution precursor or powder material is fed, causing the material to be pyrolyzed, melted, or vaporized, followed by quenching to form a metastable nanosized powder that has an amorphous (short-range ordered), or metastable microsized powder that has a crystalline (long-range ordered) structure, respectively.

The invention relates to a preparation method of a nanometer zirconia heat barrier coating which is mixed with rare-earth oxide and used for liquid-phase plasma spraying. The method comprises that precursor sol is used as a spraying raw material, atomized into fine liquid drops under atomized gas pressure, sent into plasma flame flow and sprayed and deposited on a matrix to obtain the nanometer zirconia heat barrier coating. The precursor sol is hydroxid precursor sol. According to weight proportion, the raw material includes 63 to 73 percent of ZrOCl2.8H2O and 27 to 37 percent of crystalline-state stabilizer oxide which is rare earth oxide. The invention can overcome the problems of poor sol distribution, poor sol flowing performance, chlorid ion erosion, poor sol granule atomizing effect, uneven granule sizes, and the like in the the traditional liquid-phase plasma spraying process. In the invention, a composite coating is prepared, and has the advantages of high depositing efficiency, low cost, wide spraying material, strong adaptability of the liquid-phase precursor, low heat conductivity, good heat and shock resistance, and the like.

To provide a plasma spray apparatus, having a reduced number of jet ports for the working medium transformed into plasma, resulting in a simplified structure thereof, and even when the trajectory of the working medium becomes misaligned, the apparatus remains capable of producing a plasma flame that can properly melt the spray material; thus, the spray material can be used effectively. Two jet paths in the plasma spray apparatus are formed at both sides of one supply port for spray material 17 and are arranged so that the axial directions cross each other at the outside of the nozzle anode 11; two cathodes 13 are disposed inside the two jet paths 12; and the openings of the jet paths 12 are formed into elongated holes so that the center lines thereof are parallel to each other and the areas thereof are the same.

The present invention relates to a burner using plasma, which uses a mixture fuel in which water and industrial waste oil are mixed at an appropriate ratio. A combustion tank has a positive electrode (+), a rod installed at one side of the combustion tank has a negative electrode (−), and direct current electricity is supplied to the combustion tank and to the rod from a direct current electricity supply unit. A steam supply pipe of a steam generator is installed together with a plasma torch unit which is coupled to the combustion tank, such that high-temperature steam is discharged from the steam supply pipe together with the plasma torch generated by the plasma torch unit. Thus, the high-temperature plasma torch generates a high-temperature plasma flame of 800° C. or higher to heat a combustion chamber at the inner wall of the combustion tank. A mixture fuel supply pipe is wound into a coil on the outer surface of the combustion chamber, such that the mixture fuel supply pipe is preheated by high-temperature heat. The mixture fuel in the mixture fuel supply pipe is supplied at an air pressure of 50 through a high pressure pump, and water in the mixture fuel is decomposed into hydrogen and oxygen and waste oil in the mixture fuel is decomposed into carbons. The mixture fuel is injected or sprayed through a nozzle at a high temperature to effectively and completely burn the mixture fuel. The plasma torch unit operates by means of the direct current electricity supplied by the direct current electricity supply unit if needed, to adjust the temperature of the combustion chamber of the combustion tank, thereby enabling the smooth use of the burner.

The plasma spraying and pyrolyzing process of preparing nanometer hollow microsphere powder of nanometer crystalline oxide includes preparing precursor solution, atomizing, plasma spraying and pyrolyzing in plasma flame to form solid molten drop, and cooling in liquid to solidify form the hollow spherical nanometer crystal structure. The process is simple and suitable for industrial production.

The invention belongs to the technical field of graphite purification, and particularly relates to a method and a device for high-purity purification of natural graphite. The method for purifying graphite is characterized by including the steps: 1) preparing a device for purifying graphite; 2) isolating the air; 3) generating high-temperature plasma flame flows, namely loading working gas to a working gas inlet of a plasma torch, and starting the plasma torch to enable the working gas to be connected by ionization puncture to eject high-temperature plasma flame flows from the plasma torch; and 4) using the high-temperature plasma flame flows to purify graphite, namely turning on a flash valve, feeding gas into a gas injection pipe, enabling graphite raw materials to fall into the bottom of a furnace via the high-temperature plasma flame flows to obtain purified graphite, and opening a taking port to take out the purified graphite after the furnace is cooled, wherein a gas inlet valve on the gas injection pipe is in linkage with the flash valve. The method is low in energy consumption, the graphite obtained by the method is high in purity, and the device is simple.

A method of manufacturing a acute tip, multi-wall carbon nanotube radial aggregate, comprising the steps of leading a graphite rod into plasma flame generated in a hydrogen-added inert gas atmosphere to evaporate carbon from the graphite rod and stacking, on the surface of the graphite rod, the acute tip, multi-wall carbon nanotube radial aggregation of novel carbon nano-structure useful as field emission electron sources such as probes for STM and APM, display elements, and displays.

A plasma flame is generated in an interior volume of a tubular member to be a radially directed plasma flame, directed to an inside surface of the tubular member, and reagent chemicals are injected to form soot particles, and the soot particles are deposited on the inner surface by the plasma flame. The plasma flame is generated by establishing an electromagnetic field in a region in the tube interior and inserting a plasma gas feeder nozzle into the tube interior, with the nozzle structured to emit plasma gas in a manner forming the radially directed plasma flame.

The invention provides plasma melting cracking treating equipment belonging to the technical field of machines and solving the technical problems of low incineration temperature, poor incineration effect, insufficient incineration and the like of a traditional incineration furnace. The plasma melting cracking treating equipment comprises a furnace body with a charging port and a discharging port, wherein the furnace body is internally provided with an incineration cavity communicated with the charging port and the discharging port; the furnace body is also provided with a gas outlet communicated with the incineration cavity; the top of the furnace body is also provided with a plasma torch generator capable of generating plasma flames; one end of the plasma torch generator penetrates into the incineration cavity; and the other end penetrates out of the furnace body and is connected with a lifting mechanism capable of driving the plasma torch generator to lift upwards and downwards. The treating equipment has the advantages of higher flame temperature, more sufficient incineration, higher incineration efficiency and the like.

The present invention provides a process for the manufacture of carbon nanostructures, the carbon nanostructures being selected from carbon nanotubes and carbon nano-onions. The method comprises the steps of injecting a carbon-containing gas into a plasma flame generated from a plasma forming gas to provide atomic carbon, which in the presence of in situ generated nanometer sized metal catalyst particles that act as nucleation points for growth of carbon nanostructures, produce the carbon nanostructures, and collecting the carbon nanostructures.

The invention discloses a method for producing a quartz sleeve for a fiber precast rod. The method comprises the following steps of: 1 weight manufacturing; 2 mechanical cold machining; 3 cleaning and drying; 4 tube drawing in a medium-frequency contactless mode; and 5 checkup and packaging, wherein, in step one, a weight is manufactured by adopting an external sedimentation mode of plasma horizontal type solid phase; in step two, an inner hole and an outer circle of the quartz weight are subject to the machining of grinding and honing by adopting a metal cutting machine tool matched with diamond and other grinding tools; in step three, the quartz weight is subject to degreasing, acidification, washing by pure water, drying and packaging for standby; in step four, the net quartz weight is hung in a medium-frequency furnace, heated up to a certain temperature, softened and deformed and drawn into the needed quartz sleeve by a tube drawing machine; and in step five, the quartz sleeve is checked and packaged. The method adopts plasma flame for heating and fully melts down raw materials in order that no bubble is in the gross quartz weight and can not introduce external impurities in order that melted quartz powder has high purity; the melted quartz powder has a characteristic of low hydroxyl group; secondary molding adopts medium frequency for heating and has no hydrogen and oxygen sources; and the final quartz sleeve has low hydroxyl content and good temperature resistance.

The invention belongs to the technical field of biomedical composite materials, in particular to a preparation method of a hydroxyapatite bioactive bionic coating containing trace elements. The method comprises the following steps of: firstly, reacting raw materials for preparing hydroxyapatite containing the trace elements according to the proportion at a certain temperature to obtain a suspension; and then transmitting the suspension as a precursor liquid to a high-temperature area of plasma flame and directly spraying the suspension on a biomedical metal substrate to form the hydroxyapatite coating containing the trace elements. The invention has simple process and low production cost; and the obtained hydroxyapatite coating contains the trace elements such as silicon, magnesium and the like closer to human bony bionic components and has better osteogenesis capability and important application value.

The present invention relates to an apparatus for generating flames and more particularly to the microwave plasma burner for generation of high-temperature plasma flame by injecting gaseous, liquid or solid-powder hydrocarbon-fuels into plasma generated by microwaves. The invention provides a compact and portable apparatus for generating plasma flame. The apparatus includes a magnetron, an electrical power supplier, a waveguide system, a microwave power monitering system, stub tuners, a discharge tube, a gas supply system, a plasma ignitor and a fuel supply system. The method and apparatus is described for generation of a large volume of high-temperature plasma by injecting gaseous, liquid or solid-powder hydrocarbon-fuels into the microwave plasma torch to decompose the hydrogen and carbon containing fuels, and to mix the resultant gaseous hydrogen and carbon compounds with air or oxygen gas, instantaneously generating a large volume of high-temperature flames.

The invention relates to a method for spraying suspending liquid plasma to prepare hydroxyapatite bioactive coating, which comprises following steps: adopting hydroxyapatite suspending liquid as plasma spraying raw materials, adopting a pressure tank or an electronic peristaltic pump as a power transmitting device to transmit the hydroxyapatite suspending liquid, adopting an atomizing nozzle with a small angle to inject the hydroxyapatite suspending liquid into a central region of plasma flame directly and radially or adopting a duct with small diameter to inject the hydroxyapatite suspending liquid into the central region of the plasma flame directly and radially in a linear type jet-flow mode, exchanging heat between the suspending liquid and high temperature plasma flame through transmitting and injecting the suspending liquid, and directly generating the hydroxyapatite bioactive coating on the surface of a biological medical metal base through vaporizing liquid in the suspending liquid, crushing particles, smelting and depositing. The method simplifies a tedious technological link for preparing the spraying raw materials in a method for spraying powder plasma, the spraying raw materials and energy are saved, and the structural homogeneity of the hydroxyapatite bioactive coating which is prepared is good.

The invention provides a preparation method of yttrium oxide-stabilized zirconium oxide powder with hollow a spherical nanostructure, belonging to the technical field of material preparation. The method comprises the steps of: taking noncrystal yttrium oxide-stabilized zirconium oxide powder with an amorphous phase structure as raw materials; heating with over-distance plasma flame; collecting by means of water cooling; and drying with low temperature to prepare the yttrium oxide-stabilized zirconium oxide powder with the hollow spherical nanostructure. The prepared powder has the characteristics of low fill density and high fluidity, and the like, and the microstructure is the nanocrystalline hollow spherical nanostructure, therefore, the powder is particularly suitable for a plasma spraying technology to prepare a high-temperature abrasion-resistant good-sealing coating, has simple technological process and high technology content, and can be produced in batch. Meanwhile, the powder material also can be used for the other spraying technologies (such as a hypersonic flame spraying technology and a detonation spraying technology) to prepare an oxygen sensor coating, an oxygen separation membrane, a fuel battery coating, and the like, and can be used for the fields of aerospace, precise instrument, petroleum and electron, etc.

The present invention relates to a preparation method for porous hydroxyapatite coatings. In particular, it is a method of using suspension plasma spraying to prepare porous hydroxyapatite coatings, which belongs to the technical field of biomedical material preparations. The present invention added a pore-forming agent into the hydroxyapatite suspension with a solid content of 16%-45%. After full stirring, the feedstock materials for plasma spraying were transferred into the injection system, and injected into the high temperature area of the central plasma flame. Then, the feedstock materials made the heat exchange with the high plasma flame of plasma spraying gun. Then the sprayed raw materials were subjected to breakup and refinement of the droplets, solvent evaporation, the decomposition and gasification of the pore-forming agent and melting of feedstock materials. Finally, the porous hydroxyapatite coatings are directly deposited onto the substrate surfaces of the biomedical materials.