摘要:
A device for reducing plasma irregularities includes an electrode assembly capable of applying an electric potential to said plasma. The electrode assembly includes a portion for reducing the plasma irregularities. The portion which reduces the plasma irregularities includes alternately a buried portion which is capable of altering the potential within the buried element, or else a conditioned portion of the surface which controls reflectivity and/or emissivity of portions of a surface of the electrode assembly differently.
摘要:
An arcless, atmospheric-pressure plasma generating apparatus capable of producing a large-area, temperature-controlled, stable discharge at power densities between about 0.1 W/cm3 and about 200 W/cm3, while having an operating gas temperature of less than 50° C., for processing materials outside of the discharge, is described. The apparatus produces active chemical species, including gaseous metastables and radicals which may be used for polymerization (either free radical-induced or through dehydrogenation-based polymerization), surface cleaning and modification, etching, adhesion promotion, and sterilization, as examples. The invention may include either a cooled rf-driven electrode or a cooled ground electrode, or two cooled electrodes, wherein active components of the plasma may be directed out of the plasma and onto an external workpiece without simultaneously exposing a material to the electrical influence or ionic components of the plasma.
摘要翻译:一种无弧大气压等离子体发生装置,其能够以约0.1W / cm 3至约200W / cm 3的功率密度产生大面积,温度控制,稳定的放电,同时具有小于50°的工作气体温度 描述了用于处理放电以外的材料的C. 作为实例,该装置产生活性化学物质,包括可用于聚合(自由基诱导或基于脱氢的聚合),表面清洁和改性,蚀刻,粘附促进和灭菌的气态亚稳态和自由基。 本发明可以包括冷却的rf驱动电极或冷却的接地电极或两个冷却的电极,其中等离子体的有源部件可以被引导出等离子体并且被引导到外部工件上,而不会将材料暴露于电气影响或 等离子体的离子组分。
摘要:
An arcless, atmospheric-pressure plasma generating apparatus capable of producing a large-area, temperature-controlled, stable discharge at power densities between about 0.1 W/cm3 and about 200 W/cm3, while having an operating gas temperature of less than 50° C., for processing materials outside of the discharge, is described. The apparatus produces active chemical species, including gaseous metastables and radicals which may be used for polymerization (either free radical-induced or through dehydrogenation-based polymerization), surface cleaning and modification, etching, adhesion promotion, and sterilization, as examples. The invention may include either a cooled rf-driven electrode or a cooled ground electrode, or two cooled electrodes, wherein active components of the plasma may be directed out of the plasma and onto an external workpiece without simultaneously exposing a material to the electrical influence or ionic components of the plasma.
摘要翻译:一种无弧大气压等离子体发生装置,其能够以约0.1W / cm 3至约200W / cm 3的功率密度产生大面积,温度控制,稳定的放电,同时具有小于50°的工作气体温度 描述了用于处理放电以外的材料的C. 作为实例,该装置产生活性化学物质,包括可用于聚合(自由基诱导或基于脱氢的聚合),表面清洁和改性,蚀刻,粘附促进和灭菌的气态亚稳态和自由基。 本发明可以包括冷却的rf驱动电极或冷却的接地电极或两个冷却的电极,其中等离子体的有源部件可以被引导出等离子体并且被引导到外部工件上,而不会将材料暴露于电气影响或 等离子体的离子组分。
摘要:
An apparatus and method for plasma finishing of fibrous materials including paper and knitted, woven and non-woven fibrous substrates such that desired characteristics are imparted are described. The method includes depositing a monomer comprising at least one fluorocarbon monomer with chemical additives, as required, at atmospheric pressure onto the paper or knitted, woven or non-woven substrate; exposing the monomer on a single surface of the fibrous material to an inert gas, atmospheric-pressure plasma, thereby causing polymerization of the monomer species; and repeating this sequence using multiple sequential deposition and plasma discharge steps to create a layered surface having durability against abrasion for both water-based laundry methods and dry-cleaning methods, and normal wear, without affecting the feel, drape, appearance or breathability of the substrate material. The present method uses a high-power, continuously operating plasma that is 104 times more powerful than the prior art plasma sources utilized in the textile industry, and produces a durable finish with between 0.5 and 2 s of plasma exposure. This is sufficiently rapid to meet commercial fabric processing throughput, and repeated cleaning of the electrodes is not required.
摘要:
Contamination levels in plasma processes are reduced during plasma processing, by prevention of formation of particles, by preventing entry of particles externally introduced or by removing particles spontaneously formed from chemical and/or mechanical sources. Some techniques for prevention of formation of particles include interruption of the plasma by pulsing the source of plasma energy periodically, or application of energy to provide mechanical agitation such as mechanical shockwaves, acoustic stress, ultrasonic stress, vibrational stress, thermal stress, and pressure stress. Following a period of applied stress, a tool is pumped out (if a plasma is used, the glow is first discontinued), vented, opened and flaked or particulate material is cleaned from the lower electrode and other surfaces. A burst of filtered air or nitrogen, or a vacuum cleaner is used for removal of deposition debris while the vented tool is open. Following this procedure, the tool is then be used for product runs. Alternatively, improvement of semiconductor process yields can be achieved by addition of reagents to getter chemical precursors of contamination particulates and by filtration of particulates from feedgas before plasma processing. The efficiency and endpoint for the applied stress are determined, by laser light scattering, using a pulsed or continuous laser source, e.g. a HeNe laser.
摘要:
A plasma processing apparatus and process endpoint detection method including a plasma chamber for processing an item that has a first portion of a first material and a second portion of a second material, with the first and second materials having different work functions, and a structure for generating a plasma in the plasma chamber, with the plasma generating structure including at least a pair of RF-power electrodes with one of them being excited by an RF excitation frequency. The apparatus further includes a structure for generating and ejecting electrons from the second material only when the second material is exposed to the plasma, and a structure for increasing the energies of these generated electrons and accelerating these electrons into the etching plasma with sufficient energy to generate secondary electrons in the plasma. The apparatus further includes a structure for receiving a plasma discharge voltage signal, a structure for filtering the discharge electrical voltage signal to remove the RF excitation frequency and any DC components therein, and a structure for amplifying the natural frequencies of excitation and decay of the plasma discharge voltage perturbation signal, to thereby detect the processing endpoint.In a preferred embodiment, the electron energy increasing and accelerating structure includes a structure for generating an electrode voltage sheath, and a structure for generating the electrons within this voltage sheath to thereby accelerate the electrons into the plasma. The electron generating structure includes a structure for directing a beam of photons in a selected energy range onto the item to be processed, which energy range is not sufficient to eject photoelectrons from the first material, but is high enough to generate photoelectrons from areas of exposed second material.
摘要:
Substrates are coated with a curable composition that includes at least one free radical polymerizable monomer and a heat-activated polymerization initiator. The coating is applied to the substrate and cured thereon to produce the coating. Curing is performed by purging molecular air from the vessel containing the substrate, pressuring with an oxygen-deficient gas and then curing the fabric in the oxygen-deficient gas at elevated pressure and temperature.
摘要:
A cooking vessel includes an upper element that defines a cook surface and a lower shell that defines a heat surface for contact with a heat source during heating. The upper element and the lower shell are joined together such that the cook surface and the heat surface are retained in a fixed spatial relationship with each other and a gas-filled cavity is defined between the heat surface of the lower shell and the cook surface of the upper element. An optional temperature sensor may be placed in contact with the gas for cooking temperature readout. Heat is transferred from the heat surface to the cook surface through the gas contained in the gas-filled cavity. Improved heat distribution is accomplished by static and dynamic means of enhancing gas convection. This promotes efficient and even heat distribution at low weight.
摘要:
Apparatus for the processing of materials involving placing a material either placed between an radio-frequency electrode and a ground electrode, or which is itself one of the electrodes. This is done in atmospheric pressure conditions. The apparatus effectively etches or cleans substrates, such as silicon wafers, or provides cleaning of spools and drums, and uses a gas containing an inert gas and a chemically reactive gas.
摘要:
Apparatus and method for cleaning substrates. A substrate is held and rotated by a chuck and an atmospheric pressure plasma jet places a plasma onto predetermined areas of the substrate. Subsequently liquid rinse is sprayed onto the predetermined areas. In one embodiment, a nozzle sprays a gas onto the predetermined areas to assist in drying the predetermined areas when needed.