394 results about "Hot filament" patented technology

One or more highly-oriented, multi-walled carbon nanotubes are grown on an outer surface of a substrate initially disposed with a catalyst film or catalyst nano-dot by plasma enhanced hot filament chemical vapor deposition of a carbon source gas and a catalyst gas at temperatures between 300° C. and 3000° C. The carbon nanotubes range from 4 to 500 nm in diameter and 0.1 to 50 μm in length depending on growth conditions. Carbon nanotube density can exceed 10⁴ nanotubes/mm². Acetylene is used as the carbon source gas, and ammonia is used as the catalyst gas. Plasma intensity, carbon source gas to catalyst gas ratio and their flow rates, catalyst film thickness, and temperature of chemical vapor deposition affect the lengths, diameters, density, and uniformity of the carbon nanotubes. The carbon nanotubes of the present invention are useful in electrochemical applications as well as in electron emission, structural composite, material storage, and microelectrode applications.

Hot-filament chemical vapor deposition has been used to deposit copolymer thin films consisting of fluorocarbon and siloxane groups. The presence of covalent bonds between the fluorocarbon and organosilicon moieties in the thin film has been confirmed by Infrared, X-ray Photoelectron (XPS) and solid-state ²⁹Si, ¹⁹F, and ¹³C Nuclear Magnetic Resonance (NMR) spectroscopy. The film structure consists of chains with linear and cyclic siloxane groups and CF₂ groups as repeat units.

A prepn. method of silicon thin film heterojunction solar cell includes following steps: cleaning substrate, semiconductor cleaning technology is used to do primary cleaing to substrate surface, then do ultrasonic cleaning in deionized water several times; nitrogen blow drying; prepare nitrinsic amorphous silicon layer by heater chemical vapour phase depositing technology, tungsten filament temp. is measured by pyrometer, temp of heater and sample are determined separately by two electric thermo-couples, temp. is controlled by electric temp. controller; to react and grow thin film on substrate surface; to redeposit a transmitting layer on intrinsic amorphous silicon thin film; front and back electrodes forming, sputtering technology is used to form front and back electrodes; finally to proceed vacuum heat annealing process. The thin film produced by the invention has illumination stability, the photoconduction gain can reach to 10 to the power 6 on Am1.5 100mW/cm2 standard illumination.

The present invention relates to a device for improving plasma activity in a magnetron sputtering reactor containing substrates to be coated where a primary plasma is created by a DC or AC voltage applied between the substrates and an additional electrode. Increased plasma activity is obtained by thermionic emission of electrons from a hot filament heated by either DC or AC current or combinations thereof. The device is particularly useful for increasing the adhesion of layers deposited by magnetron sputtering on cutting tool inserts made of cemented carbide, high speed steels, cermets, ceramics or cubic boron nitride.

The invention discloses a preparation method of graphene on a diamond (111) surface, which mainly comprises the steps of: (1) growing an undoped diamond transition layer on a substrate: placing the substrate on a substrate support of a cavity of a hot filament chemical vapor deposition system, and growing a diamond transition layer; (2) growing a B-doped diamond film on the diamond transition layer; and (3) forming the grapheme through annealing and self-organization. By the preparation method, larger-size samples can be prepared, and the size is from nano scale to micron scale even millimeter scale. The method for preparing the graphene through self-organization, and is easier to realize; the grown grapheme has higher area controllability, can reach the micron scale or larger size which cannot be realized by most existing methods. In addition, the diamond has multiple excellent characteristics, and the boron-doped diamond substrate is not symmetrical, therefore, the graphene formed on the boron-doped diamond substrate can easily generate an energy gap, which is more beneficial to application of the graphene to devices.

The invention discloses a preparation method of a double-sided passivated crystalline silicon solar cell, belonging to the technical field of photovoltaic power generation. The preparation method comprises the following steps of: firstly, respectively carrying out surface precleaning and surface texturing on P-shaped single crystal silicon and a polycrystalline silicon wafer by adopting an alkaline solution and an acid solution; secondly, diffusing by using phosphorus oxychloride as a diffusion source to form a PN junction; thirdly, removing a phosphosilicate glass on the surface of the silicon wafer by adopting a chemical wet method, and etching the edge of the silicon wafer by adopting a plasma; fourthly, preparing a silicon nitride film on the surface of an emitting region of a P-type silicon wafer by adopting a plasma enhanced chemical vapor deposition method; fifthly, preparing a mixed phase film material of hydrogenated microcrystalline silicon and amorphous silicon by adopting a hot filament chemical vapor deposition method, depositing a film at one side of the P-type silicon wafer, and passivating the defects and a dangling bond on the surface of the P-type silicon wafer; and sixthly, sintering a screen printing back electrode and a screen printing positive electrode to form the solar cell. The invention lowers the probability of compounding photo-generated minority carriers on the back surface, enhances the long-wave light quantum efficiency and creates the conditions of transportation and collection of the photo-generated carriers.

A method to grow a boule of silicon carbide is described. The method may include flowing a silicon-containing precursor and a carbon-containing precursor proximate to a heated filament array and forming the silicon carbide boule on a substrate from reactions of the heated silicon-containing and carbon-containing precursors. Also, an apparatus for growing a silicon carbide boule is described. The apparatus may include a deposition chamber to deposit silicon carbide on a substrate, and a precursor transport system for introducing silicon-containing and carbon-containing precursors into the deposition chamber. The apparatus may also include at least one filament or filament segment capable of being heated to a temperature that can activate the precursors, and a substrate pedestal to hold a deposition substrate upon which the silicon carbide boule is grown. The pedestal may be operable to change the distance between the substrate and the filament as the silicon carbide boule is grown.

A processing system for integrated substrate processing in a substrate processing tool. The processing system contains a substrate holder configured for supporting and controlling the temperature of the substrate, a hot filament hydrogen radical source for generating hydrogen radicals, and a controller configured for controlling the processing system. The hot filament hydrogen radical source includes a showerhead assembly containing an internal volume and a showerhead plate having gas passages facing the substrate for exposing the substrate to the hydrogen radicals, and at least one metal wire filament within the internal volume to thermally dissociate H₂ gas into the hydrogen radicals.

The invention discloses a hot-filament chemical vapor deposition batch preparation method of a complicated-shape diamond coated cutting tool in the technical field of mechanical machining, comprising the steps of: placing a sandwich type foundation on which the cutting tool is arranged on a CVD (Chemical Vapor Deposition) equipment water-cooling worktable through inserting a cutting tool holder of a pretreated complicated-shape hard alloy cutting tool; adopting two lines of hot filaments, wherein the upper line of hot filaments is as high as the nose of the hard alloy cutting tool and the lower line of hot filaments is as high as the bottom of the cutting edge of the cutting tool; and filling hydrogen and acetone and depositing a diamond coating on the surface of the complicated-shape hard alloy cutting tool. According to the the invention, the surface temperature of an underlayer at the cutting edge can be effectively reduced, the rate of the deposition is not decreased and the quality of the diamond coating is improved.

The invention provides a nano-diamond film with Si-V luminescence and a preparation method thereof. The nano-diamond film is prepared on a single crystal silicon substrate by use of a hot filament chemical vapor deposition method; heat preservation is performed on the film for 5-150 minutes in air at a temperature ranging from 500 to 700 DEG C, and then the nano-diamond film with Si-V luminescence is obtained. The nano-diamond film prepared has relatively high Si-V luminescence intensity which has very important scientific significance and engineering value for the application of the nano-diamond film in the fields such as single photon sources, quantum information processing, photoelectric devices, biomarkers, semiconductor devices and field emission displays.

The invention relates to a diamond coated cutter, which comprises a drill tip, an edge part and a handle part, and is characterized in that: (1) a substrate material is a hard alloy with less than 6 mass percent of Co; (2) the drill tip and the edge part of the cutter are coated with a diamond coating; (3) the head part of the cutter has a drilling and milling integrated structure, the apex angleof the drill tip is double apex angles of 135 degrees and 90 degrees or a disc angle of 5 to 10 degrees, and the thickness of the coated diamond coating is 10 to 30mu m. The coated cutter is manufactured by the following steps of: (1) selecting an appropriate hard alloy substrate material; (2) forming the cutter; (3) pretreating a cutter coating; and (4) preparing the diamond coating on the drilltop and the edge part of the cutter through hot filament chemical vapor deposition (CVD). The phenomena of burrs and obvious surface layer peeling when the coated cutter processes a fiber composite material are avoided.

A Hall-current ion source with a narrow ion beam energy distribution is presented. A narrow ion beam energy distribution is provided by a utilization of a multi-chamber anode through which a working gas is applied and delivers a uniform working gas distribution in a discharge channel. Introduction of a working gas through a lower part of anode makes applied electric potential in a narrow area and leading to enhanced conditions for a working gas ionization, high ion beam current, high translation of a discharge voltage into a “monochromatic” ion beam mean energy distribution. A multi-chamber anode with a slit exit for introduction of a working gas into area under anode is utilized to prevent a backflow of insulating and dielectric depositions on anode parts, and under anode area makes a nominal operation with reactive gases without a phenomenon called as “anode poisoning” during long operating hours. The ion source with a shielded Hot Filament design shows very effective ion beam neutralization properties; it produces less heating of the substrate than a traditional one; it has a cleaner ion beam because its beam is not contaminated by the Hot Filament material particles. In the design with two Hot Filaments the ion source operation is extended for tens of hours.

The invention discloses a preparation method for a diamond coated mechanical seal ring. A hard-alloy silicon-carbide/silicon nitride ceramic mechanical seal ring serves as a substrate, and a diamond thin film is deposited on a work surface of the mechanical seal ring through a hot filament chemical vapor deposition (HFCVD) method. The specific process method comprises the steps that firstly, a layer of micron-diamond thin film which is coarse in grain, excellent in abrasion resistance but difficult to polish is deposited on the surface of the substrate; and then thinned nano-diamond particles are deposited between micron-diamond particles by changing process parameters so that sunken parts between the coarse micron-diamond particles can be filled, and the purposes that the surface roughness of a diamond coating is lowered and accordingly subsequent grinding and polishing are convenient. According to the diamond coated mechanical seal ring obtained through the two-step deposition method in the preparation method, abrasion rate of a contact end face can be lowered significantly, and the working life of the diamond coated mechanical seal ring is prolonged significantly compared with a non-coated mechanical seal ring.

The invention provides a method for preparing a diamond coating on a cemented carbide tool. Using plasma CVD technology, a gas mixture containing hydrogen, carbon and silicon is used as the reaction gas to deposit a diamond coating containing diamond phase and silicon on the cemented carbide tool; among them, silicon is carried out in the CVD process of the diamond coating At the same time, it is deposited into the diamond coating and at the interface between the diamond coating and the cemented carbide tool; the existence and enrichment of silicon at the interface of the diamond coating and the cemented carbide tool make the diamond coating more effective on the cemented carbide tool. Tools form high adhesion. The CVD technology includes: microwave plasma CVD technology, hot wire CVD technology, direct current arc plasma CVD technology. The invention has the advantages of effectively improving the adhesion of the diamond coating and simplifying the preparation process of the coating.

The invention discloses a production method of a diamond film coating of a microbit, characterized in that: surface treatment is carried out on the substrate material of the microbit, a multi-steps deposition method is used, and the deposition growth conditions of the diamond film are controlled with hot-filament chemical vapor deposition method, wherein, the deposition growth conditions of the diamond film comprise the temperature of hot filaments, the pressure in the cavity, the selection of reaction source gas, distribution of flow and hot filaments, distance between the top end of the microbit and the hot filaments, spacing of the hot filaments distribution, deposition growth time of the diamond film, surface temperature of the top of the microbit, and the like. By adding the diamond film coating, the ware resistance and cutting ability of the microbit are reinforced, so that the service life of the micorbit is lengthened by more than 5-10 times and the precision of the microbit is not changed, and the frequency of changing drill of the drilling machine is reduced, the production efficiency is improved, and the production cost is greatly reduced.

The invention discloses a hot filament and thermal evaporation vapor deposition thin film device for material preparation. The device consists of a hot filament chemical vapor deposition activation part for activating a source gas to deposit the material and forms a combination with a thermal evaporation part. A substrate bracket does combined movement relative to the hot filament or the thermal evaporation wire or the hot filament and the thermal evaporation wire.

The invention discloses a method for preparing an amorphous silicon carbide ceramic-diamond composite coating. The method comprises the steps of cracking macromolecular organic silane serving as a precursor on the surface of a substrate by adopting a macromolecular precursor cracking method to generate an amorphous silicon carbide ceramic film, and then performing in-situ deposition on the micro diamond film by adopting a hot filament chemical vapor deposition method to obtain the amorphous silicon carbide ceramic-diamond composite coating. Compared with the prior art, the amorphous silicon carbide transition layer prepared by adopting the macromolecular precursor cracking method can be used for effectively blocking residual cobalt phase on the surface of a hard alloy matrix after two-step treatment and improving the rough surface of the hard alloy matrix; and the prepared amorphous silicon carbide ceramic-diamond composite coating has excellent adhesion and extremely high abrasion resistance, and is suitable for preparing high-quality diamond coating cutters.

The invention belongs to the technical field of solar battery devices, and relates to a PIN junction Si-based film solar battery and a preparation process thereof. Concretely, a first P layer, a first I layer and a first N layer of a PIN junction of the core of the Si-based film solar battery are prepared by using a hot filament chemical vapor deposition method by which a passivation layer made of dielectric materials grows between the first P layer and the first I layer. The hot filament chemical vapor deposition method has the advantages of high air source usage, rapid growth speed, reduced interface defect and the like. Compared with the film grown by a PECVD method, the film in the invention has higher H content and less dangling bonds and better film quality. In addition, the passivation layer between the first P layer and the first I layer can passivate the dangling bonds on the interface and increase current carrier mobility at the interface position by tunnel effect, thus greatly improving battery efficiency.

The invention belongs to the field of electrochemistry, and relates to an electrochemical reduction CO2 catalyst based on boron and nitrogen co-doped nano-diamond. A doping agent in the nano-diamond has the nitrogen content of 0-10 at%, the boron content of 0-5 at% and the granularity of 10-500 nm. The nano-diamond is prepared by depositing for 10-20 hours through a hot wire chemical gas-phase depositing method at the tungsten filament temperature of 1900-2200 DEG C and the pressure of 200-2000 Pa, wherein the volume percentage of N2 is 2.5-25%, and the volume percentage of CH4 is 0.5-20%. The catalyst has the advantages of being high in electro-catalysis activity, C2 product selectivity and material stability and the like for electrochemical reduction CO2 reaction, is a nonmetallic electro-catalysis material excellent in performance and low in price, and can be applied to the field of CO2 resourceful utilization.