46 results about "Radiofrequency plasma" patented technology

A plasma reactor for processing a workpiece includes a reactor chamber, an electrostatic chuck within the chamber for supporting a workpiece, an RF plasma bias power generator coupled to apply RF power to the electrostatic chuck and a refrigeration loop having an evaporator inside the electrostatic chuck with a refrigerant inlet and a refrigerant outlet. Preferably, the evaporator includes a meandering passageway distributed in a plane beneath a top surface of the electrostatic chuck. Preferably, refrigerant within the evaporator is apportioned between a vapor phase and a liquid phase. As a result, heat transfer between the electrostatic chuck and the refrigerant within the evaporator is a constant-temperature process. This feature improves uniformity of temperature distribution across a diameter of the electrostatic chuck.

A plasma reactor for processing a workpiece includes a reactor chamber, an electrostatic chuck within the chamber having a top surface for supporting a workpiece and having indentations in the top surface that form enclosed gas flow channels whenever covered by a workpiece resting on the top surface. The reactor further includes thermal control apparatus thermally coupled to the electrostatic chuck, an RF plasma bias power generator coupled to apply RF power to the electrostatic chuck, a pressurized gas supply of a thermally conductive gas, a controllable gas valve coupling the pressurized gas supply to the indentations to facilitate filling the channels with the thermally conductive gas for heat transfer between a backside of a workpiece and the electrostatic chuck at a heat transfer rate that is a function of the pressure against the backside of the workpiece of the thermally conductive gas. The reactor further includes an agile workpiece temperature control loop including (a) a temperature probe in the electrostatic chuck, and (b) a backside gas pressure controller coupled to an output of the temperature probe and responsive to a specified desired temperature, the controller governing the gas valve in response to a difference between the output of the temperature probe and the desired temperature.

The invention relates to a powder preparation method for an induction heating and radio frequency plasma combined atomizing powder system. The powder preparation method comprises the following steps that (1), raw materials are prepared and processed; (2), the system is pre-vacuumed and a protective atmosphere is established; (3), wire materials are straightened and conveyed; (4), high-frequency induction preheating is carried out; (5), radio frequency plasma melting is carried out; (6), powders are prepared by atomizing; (7), separation and dust removal are carried out; and (8), the powder size is graded. The powder preparation method for the induction heating and radiofrequency plasma combined atomizing powder system uses high purity metal wire material instead of the powders as the raw materials, so that the carrying of raw materials to adsorb gas and water is reduced; a technology of the high frequency induction heating combined with the radio frequency plasma smelting and gas atomization is adopted, during the whole process of heating, melting, and the gas atomization is free of pollution and impurities in the protective atmosphere, and the degree of superheat of liquid flow ordroplets is increased during the process of radio frequency plasma smelting; and high quality spherical powders can be obtained by adopting high pressure atomizing nozzles atomizing, and the yield ofmetal powders per unit time is increased.

A radiofrequency plasma spark plug configured to equip a combustion chamber including: an annular shell with a main axis; a central electrode made of a conductive material, extending along the main axis and including an inner portion arranged inside the annular shell and an outer portion arranged outside the annular shell; an annular electrically insulating part extending at least about the inner portion of the central electrode so as to be interposed between the shell and the electrode, the insulating part only covering part of the outer portion of the central electrode. The insulating part includes an annular flange concealing the entire circular terminal surface of the shell relative to the uncovered part of the electrode.

ZnO layer with thickness of 1-8nm is developed on sapphire substrate or silicon substrate through plasma in radio frequency assistant molecular beam epitaxy device. Detection and control are carried out for gas flow by using flowmeter and leakage valve on the said molecular beam epitaxy device. When ion capture trap is opened, only, neutral particles are allowed to enter into development room; and when closed, plasma enters into the development room. Since different stabilities of polar surface and nonpolar surface of ZnO, initialized Nano rings in ZnO are formed on surface of substrate. Then, ZnO is developed along ring so as to form Nano tube. The invention develops orientated ZnO Nano tube in high quality without need of introducing catalyst or template.

The invention discloses a method for preparing titanium alloy parts by increasing and decreasing materials. The method specifically comprises the steps that titanium hydride particles are prepared, specifically, titanium sponge is adopted as a raw material, the titanium sponge reacts with hydrogen to produce titanium hydride, and after the reaction is completed, the produced titanium hydride is crushed; spheroidized titanium particles are prepared, specifically, the crushed titanium hydride particles are subjected to radiofrequency plasma spheroidizing treatment; material increasing and decreasing processing is conducted, specifically, a three-dimensional CAD model is generated according to the parts and imported into a software program of a material increasing and decreasing mixed processing system; software generates a plurality of deposition layers and deposition modules, and the deposition path and deposition parameter of each deposition module are set; and detecting is conducted in real time, the material is subjected to material decreasing processing repair according to original data and real-time detected data. According to the method, high-precision spheroidized titanium alloy particle materials are combined with a material increasing and decreasing manufacturing technology, and the method can be widely applied in industry.

The invented method carries processing for nano TiO2 in radiofrequency plasma generating device by using gas to raise photoelectric conversion efficiency of TiO2 photocell. The method is as following: placing nano TiO2 in radiofrequency plasma generating device, after vacuumizing, at least one of following gas Ar, He, N2, N2+H2 is added to radiofrequency plasma generating device; adjusting following parameters: gas flow rate 0.01-0.90 liter/minute, power of radio frequency 50-1000W, temperature 100-550deg.C and processing time 0.5-10 hour. The product is obtained after processing. The processed product possesses better performance of photovoltaic conversion, and conversion efficiency is raised to 30%-80%.

The invention belongs to the field of preparation and research for a spherical metal-based powder, and provides a method for preparing a superfine spherical molybdenum-based powder. The method comprises the following steps: S1, preparation for a precursor solution: a metal molybdenum source and a nanometer oxide in raw materials are dissolved in an appropriate amount of solvent and then stirred toobtain the transparent precursor solution; and S2, preparation for a superfine spherical powder product: radiofrequency plasma spheroidization is carried out on the obtained precursor solution, the precursor solution is conveyed to an atomizing nozzle by carrier gas and atomized, and then arrives at a high-temperature area for radiofrequency plasma heating, a solute in the precursor solution is decomposed to obtain the nano-composite powder of WO3 and the corresponding oxide, then the nano-composite powder reacts with H2 to obtain oxide-dispersion-strengthened molybdenum powder, then the composite powder is melted and becomes spherical under the effect of surface tension, and is cooled to obtain the product. The method provides a new thought for preparing the superfine spherical oxide-dispersion-strengthened molybdenum powder, and has the advantages of being short in production period, low in cost, convenient to operate, and the like.

A method for cleaning the surface of a silicon substrate, covered by a layer of silicon oxide includes: a) exposing the surface for 60 to 900 seconds to a radiofrequency plasma, generated from a fluorinated gas, to strip the silicon oxide layer and induce the adsorption of fluorinated elements on the substrate surface, the power density generated using the plasma being 10 mW/cm² to 350 mW/cm², the fluorinated gas pressure being 10 mTorrs to 200 mTorrs, and the substrate temperature being lower than or equal to 300° C.; and b) exposing the surface including the fluorinated elements for 5 to 120 seconds to a hydrogen radiofrequency plasma, to remove the fluorinated elements from the substrate surface, the power density generated using the plasma being 10 mW/cm² to 350 mW/cm², the hydrogen pressure being 10 mTorrs to 1 Torr, and the substrate temperature being lower than or equal to 300° C.

The invention relates to a radiofrequency plasma generating device that comprises: a supply circuit (2) including a switch (M) controlled by a control signal (V1) for applying a voltage (Vinter) on an output of the control circuit at a control frequency; at least two plasma-generating circuits (BB1, BB2, BB3, BB4) connected in parallel at the output of the supply circuit, each circuit having its own resonance frequency and being capable of generating plasma when a high voltage level is applied to the output of the supply circuit at a frequency substantially equal to the resonance frequency of the plasma generation circuit; and a supply control device (5) for determining the control frequency from the resonance frequencies (F1, F2, F3, F4) of the plasma generation circuits in order to selectively control each circuit according to the control frequency used.

The invention relates to a radiofrequency plasma synthetic method for extracting alumina from aluminum residues. The method is characterized in that a thermal plasma technology is used for constructing a radiofrequency plasma synthesis apparatus as a high-temperature heat source, through processing of the thermal plasma and high temperature purifying of the aluminum residues, thereby the alumina is extracted from the aluminum residues to obtain the alumina ceramic powder, at the same time, the aluminum residues can be processed, alumina is produced, and the aluminum residues can be transited to merchantable products. The radiofrequency plasma synthesis apparatus comprises a powder feeder, a radio frequency generator, a thermal plasma source, a reaction chamber, a powder collection unit and a vacuum pump.

The invention discloses a bendable plasma surgical electrode for treating intervertebral disc protrusion, which relates to the technical field of medical instruments, comprising a sub-needle, an insulating head, a loop tube, a relay cannula, a four-lumen tube, an outer cannula, a cannula fixing frame, a handle mechanism, a housing and a cable, wherein the sub-needle is embedded in the insulating head, the insulating head is embedded in the loop tube, and the sub-needle and the loop tube form a positive and negative electrode loop on the head through an electrically conductive liquid and are isolated by the insulating head. The invention relates to a flexible plasma surgical electrode for treating intervertebral disc protrusion, which has multiple therapeutic functions, has small postoperative trauma, simple operation and high safety, can precisely perform ablation and decompression, solves the shortcomings of the existing therapeutic methods, and meets the treatment needs of a patientgroup.

The invention relates to a device for generating a radiofrequency plasma, which comprises a supply module (20) applying, on an output interface, an excitation signal (U) at a setpoint frequency (Fc), adapted for generating a spark (40) at the output of a plasma-generation resonator (30) connected to the output interface of the power module, and a control module (10) supplying the setpoint frequency to the power module upon a command for generating the radiofrequency plasma, wherein said device is characterised in that the control module includes a means for determining an optimal excitation frequency, capable of adapting the setpoint frequency (Fc) to the resonance conditions of the device after formation of the spark.

The invention provides a heat treatment waste gas plasma recombination power generation method and a plasma recombination reactor.The heat treatment waste gas plasma recombination power generation method comprises the following technical steps that 1, tail gas of heat treatment equipment is generated; 2, the tail gas of the heat treatment equipment is pretreated; 3, the pretreated tail gas is guided into the plasma recombination reactor for a recombination reaction; 4, gas prepared in the step 3 is guided into a gas turbine generator for power generation.The heat treatment waste gas plasma recombination power generation method and the plasma recombination reactor have the advantages that an existing traditional treatment technique-waste gas burning is replaced with a plasma recombination treatment technique on the basis of a target of a factory on heat treatment waste gas energy regeneration, the heat treatment waste gas can be effectively recombined into energy gas under the normal temperature condition by adopting low-energy consumption radiofrequency plasma to cooperate with a nanometal catalyst, the energy gas is connected to the gas turbine generator for power generation by cooperating with improvement of a power generator, and therefore the effects of low carbon emission and energy regeneration are simultaneously achieved.

The invention relates to a radiofrequency plasma surgical electrode including an electrode head, a surgical electrode rod, a surgical electrode handle and a plug cable; one end of the surgical electrode handle is connected with one end of the surgical electrode rod, and the other end of the surgical electrode handle is connected with the plug cable; the electrode head is arranged at the other endof the surgical electrode rod; the electrode head is an L-shaped electrode head. The electrode head of the radiofrequency plasma surgery electrode is the L-shaped electrode head, a surface membrane can be picked up when the handle is in a tightly clamping manner, a tissue is vaporized, cut, melted, shrunk, hemostatic and repaired, and the membrane is damaged; moreover, the problem of hemostasis ofthe nerve surface membrane is solved, and intraoperative bleeding is prevented.