202 results about "Boron trichloride" patented technology

Decontamination formulations for neutralization of toxic industrial chemicals, and methods of making and using same. The formulations are effective for neutralizing malathion, hydrogen cyanide, sodium cyanide, butyl isocyanate, carbon disulfide, phosgene gas, capsaicin in commercial pepper spray, chlorine gas, anhydrous ammonia gas; and may be effective at neutralizing hydrogen sulfide, sulfur dioxide, formaldehyde, ethylene oxide, methyl bromide, boron trichloride, fluorine, tetraethyl pyrophosphate, phosphorous trichloride, arsine, and tungsten hexafluoride.

A novel polycrystalline stoichiometric fine SiC fiber substantially free of impurities is produced using a novel pre-ceramic polymer. The pre-ceramic polymer is prepared by reacting a mixture of chlorodisilane, boron trichloride, and a vinyl chlorodisilane with an excess of hexamethyldisilazane to form the pre-ceramic polymer resin, which may then be melt-spun, cured, pyrolyzed and heat-treated to obtain the finished SiC fiber. The manufacturing process for the production of the fine SiC ceramic fiber allows for flexibility with respect to cross-linking, in that low-cost thermal treatments may replace more complex methods, while obtaining fibers with improved materials properties as compared to currently available SiC fibers.

The invention relates to a preparation method for a SiBN(C) ceramic fiber precursor. The preparation method comprises the steps of synthesizing SiBN(C) ceramic fiber precursor molecules by using methyl dichlorosilane (MeHSiCl2), hexamethyl disilazane (HMDZ), boron trichloride (BCl3) and methylamine (CH3NH2) at a temperature ranging from-40 DEG C to-80 DEG C; removing toluene from an anhydrous toluene solution of the SiBN(C) ceramic fiber precursor molecules; heating to a temperature of 130-300 DEG C to obtain a prepolymer; then adding active group-terminated polydimethylsiloxane or active group-terminated long carbon chain molecules; keeping for 10-100 h at the temperature of 130-300 DEG C; defoaming and melt-spinning. Aiming at the problems of large friability, low strength and the like of the SiBN(C) ceramic fiber precursor, the SiBN(C) ceramic fiber precursor with excellent flexibility is prepared by employing a copolymerization method, thereby providing a foundation for continuous and integrated preparation of SiBN(C) ceramic fibers.

The invention relates to a preparation method for a SiBNC fiber/SiBNC composite material. The preparation method for the SiBNC fiber/SiBNC composite material comprises the following steps: (1) preparing a precursor polymer by polymerizing a micromolecular monomer boron trichloride, methyl hydrogen dichlorosilane and hexamethyldisilazane; (2) pretreating the surface of the SiBNC fiber and performing pre-crosslinking with the precursor polymer; (3) performing thermoforming to obtain a prefabricated product; (4) performing infusible treatment on the prefabricated product; and (5) performing ceramic treatment at high temperature. The SiBNC fiber/SiBNC composite material prepared by the method has high density, uniform components, low porosity, high-temperature resistance and excellent mechanical performance.

The invention relates to a boron-carbon-nitrogen ceramic fiber and a preparation method thereof. The boron-carbon-nitrogen ceramic fiber is of a continuous fiber, the chemical composition is of BxC3Ny, in the formula, x equals to 0.1-1.5, y equals to 0.1-1.5, the resistivity is 1.0 multiplied by 10<-2>-1.0 multiplied by10<3>omega.cm, and the tensile strength is 1.0-2.0GPa. The preparation method disclosed by the invention comprises the following steps of taking polyacrylonitrile precursors as raw materials, and performing circulating treatment with boron trichloride and ammonia so as to get the continuous boron-carbon-nitrogen ceramic fiber. The preparation method has the advantages of simple process, low cost and easy industrialized production; and the chemical composition and the resistivity of the boron-carbon-nitrogen ceramic fiber can be regulated, and the fiber can be applied to the field of functional composite materials with the functions of stealth, heat insulation and the like.

Disclosed are a fluidized bed without a sieve plate and a method for preparing boron trichloride using same. The method comprises: filling the bed body (1) of a fluidized bed without a sieve plate with a powder raw material, i.e. an alkaline earth metal boride, via a raw material supplying device (4); opening a carrier gas source (2), feeding the carrier gas into the bed body (1) of the fluidized bed without a sieve plate, so that the powder raw material i.e. the alkaline earth metal boride is in a fluidized state in the bed body (1) of the fluidized bed without a sieve plate; opening a heating device (5) to heat the bed body (1), feeding a reaction gas i.e. anhydrous hydrogen chloride when the temperature reaches the specified temperature; and after the reaction reaches the specified time, opening and starting a separating device (7), so as to obtain the necessary boron trichloride.

A method of manufacturing a thin film magnetic head capable of improving a yield while making a pole width extremely minute with high precision is provided. A write gap layer and a bottom pole are selectively etched in a region other than a portion corresponding to a front end part through the RIE with the front end part having an extremely minute uniform width as a mask in an atmosphere of gas including at least chlorine out of chlorine and boron trichloride and at an ambient temperature within a range of 300° C. to 300° C. The width (pole width) of a pole portion can be made uniform with high precision along a length direction so that the yield of the thin film magnetic head can be improved.

The invention discloses a preparation method of high-purity boron trichloride-11, and belongs to the field of preparation methods of boron compounds. The preparation method comprises the steps such as pretreating raw materials, synthesizing boron trichloride-11 through reaction of aluminum chloride and boron trifluoride-11, filtering, preliminarily separating, rectifying and purifying, collecting the high-purity boron trichloride-11 product, treating tail gas, and the like. The high-purity boron trichloride-11 prepared by the preparation method disclosed by the invention is high in purity which can reach over 99.9999%, can satisfy requirements of manufacturing integrated circuit semiconductor apparatuses on a large scale, effectively improves interference resistance and radiation resistance of an integrated circuit, and can be used as the raw material for manufacturing raw materials such as a high-purity boron-11 isotope material, a special boron fiber material and light-guide fiber.

The invention relates to a high-boron content silicon-boron-carbon-nitrogen precursor and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing functional, bifunctional and trifunctional chlorosilane containing unsaturated groups and hexamethyl-disilazane at a low temperature according to a certain ratio, raising the temperature and completely reacting, dropping 1,3-diethyl cycloborazane under low temperature conditions according to a certain ratio, fully reacting the reactants, and finally performing reduced pressure distillation to obtain the solvent and by-products produced by the reaction, thereby obtaining faint yellow viscous liquid or a solid product, namely the SiBCN ceramic precursor. According to the synthetic method disclosed by theinvention, a novel Polyborosilicate resin is prepared by adopting a 'double boron source', the boron content of the prepared SiBCN ceramic can reach 20%, and the problems that the boron content is low and improvement of high temperature resistance and oxidation resistance of the ceramic is not obvious can be solved. The elementary composition regulation range of the precursor disclosed by the invention is wide, and resins which are suitable to serve as a high-temperature-resistant coating, a fiber reinforcement or a ceramic-based composite material matrix and have different elementary compositions can be prepared.

The invention relates to a bromfenac sodium preparation method. The preparation method comprises specific steps as follows: indole reacts under the action of DMSO (dimethylsulfoxide) to produce 3-bromoindole; 3-bromoindole is added to 2-methoxyethanol, acid is added for hydrolysis, and 2-indolinone is obtained; boron trichloride is added to methylbenzene, a methylbenzene mixed solution of p-bromobenzonitrile and 2-indolinone is added dropwise, aluminum chloride is then added, acid is added, a reaction is performed, and 7-(4-bromobenzoyl)-1,3-dihydro-indol-2-one is obtained; hydrolysis is performed with an alkaline solution, acid is added for neutralization, and bromfenac is obtained; ethanol is added to bromfenac, bromfenac and a sodium hydroxide solution form salt, the salt is cooled and subjected to recrystallization, and bromfenac sodium is obtained. Compared with the prior art, the synthetic route is short, high-purity bromfenac sodium can be prepared, the quality meets the latest standards of pharmacopoeia, industrial production is facilitated, and the method can provide powerful guarantee for industrial production of bromfenac sodium and intermediates of bromfenac sodium.

The invention discloses a preparation method of modified active carbon. The preparation method comprises the following steps: at first, adding active carbon into a mixture of ethylene glycol dimethacrylate and a boron trichloride-trimethyl amine complex, heating to carry out reactions so as to obtain a product (A), then adding the product (A) into oxalic acid, heating to a temperature of 50 to 60 DEG C under a vacuum condition, maintaining the temperature for 60 to 100 minutes, filtering to obtain a product (B); and finally reacting the product (B) with benzyl triethyl ammonium chloride to obtain the modified active carbon. The technology of the provided preparation method is simple, and the prepared modified active carbon has a good performance on adsorbing heavy metal ions.

It is an object of the present invention to enhance a selection ratio in an etching process, and provide a method for manufacturing a semiconductor device that has favorable uniform characteristics with high yield. In a method for manufacturing a semiconductor device according to the present invention, a semiconductor layer is formed, a gate insulating film is formed on the semiconductor film, a first conductive layer is formed on the gate insulating film, a second conductive layer is formed on the first conductive layer, the first conductive layer and the second conductive layer are etched to form a first conductive-layer pattern, the second conductive layer in the first conductive-layer pattern is selectively etched with plasma of boron trichloride, chlorine, and oxygen to form a second conductive-layer pattern, and a first impurity region and a second impurity region are formed in the semiconductor layer.

The invention discloses a procaterol hydrochloride impurity preparation method, which comprises: 1, adding procaterol hydrochloride to an organic solvent under an alkaline condition, adding an appropriate amount of benzyl halide, carrying out heating reflux until the reaction is complete, and carrying out post-treatment to obtain an intermediate 1; step 2, adding the intermediate 1 into a reaction bottle, then adding an organic solvent, raising the temperature, adding an oxidant aqueous solution, pouring into ice water after heating reaction is completed, and separating out a solid to obtain an intermediate 2; and step 3, adding the intermediate 2 into a reaction bottle, then adding an organic solvent, cooling to a low temperature, slowly adding boron trichloride, keeping the low temperature until the reaction is complete, pouring into ice water, separating out solids, and filtering to obtain the procaterol impurity. Procaterol hydrochloride which is easy to obtain is used as an initial raw material to prepare the procaterol hydrochloride impurity, the synthesis cost of the procaterol hydrochloride impurity is reduced, the preparation steps of the procaterol hydrochloride impurity are simplified, and the selectivity is improved, so that the preparation time is saved, and the preparation efficiency is improved. The total yield of the reaction is 50-70%.

A novel polycrystalline stoichiometric fine SiC fiber substantially free of impurities is produced using a novel pre-ceramic polymer. The pre-ceramic polymer is prepared by reacting a mixture of chlorodisilane, boron trichloride, and a vinyl chlorodisilane with an excess of hexamethyldisilazane to form the pre-ceramic polymer resin, which may then be melt-spun, cured, pyrolyzed and heat-treated to obtain the finished SiC fiber. The manufacturing process for the production of the fine SiC ceramic fiber allows for flexibility with respect to cross-linking, in that low-cost thermal treatments may replace more complex methods, while obtaining fibers with improved materials properties as compared to currently available SiC fibers.

The invention discloses a method for preparing a SiNCB ceramic material, relates to a method for preparing a ceramic material, and aims to solve the problems that a SiNCB ceramic material prepared by using a conventional method has high possibility of crystallization and instable at high temperature. The method comprises the following steps: I, putting a nitrogen source, a silicon source, an acid-binding agent and a solvent into a reactor to react at the room temperature under the protection of an inert gas; II, performing vacuum extraction filtration on the reaction product, mixing with borane tetrahydrofuran, and putting into a reactor to react; III, adding a boron trichloride n-hexane into the reactor to react, and heating to be the room temperature; IV, performing extraction filtration on the product, and performing vacuum rotary evaporation to obtain a ceramic precursor; V, putting the ceramic precursor into a tubular furnace, performing pyrolysis, and cooling to be the room temperature along the furnace to obtain the SiNCB ceramic material. The SiNCB ceramic material is excellent in oxidation resistance at 1450 DEG C and is not decomposed or crystallized when being used for a long time. The method can be applied to the field of silicon-based ceramic materials.

The invention relates to a method for preparation of an SiBN(C) ceramic fiber precursor by a one-pot technique. The method includes: at a temperature ranging from -30DEG C to -10DEG C, synthesizing an anhydrous n-hexane solution of an SiBN(C) ceramic fiber precursor molecule from dichloromethylsilane, boron trichloride, methylamine and a solvent anhydrous n-hexane; under 70-120DEG C, removing n-hexane from the precursor molecule solution, then adding active group terminated polydimethyl siloxane, raising the temperature to 140-300DEG C, conducting heat preservation for 5-150h to obtain an SiBN ceramic fiber precursor polymer, and carrying out defoaming and melt spinning, thus obtaining the SiBN(C) ceramic fiber precursor. Compared with the existing synthesis methods, the method has the advantages of simple process and convenient operation, and preparation of the precursor can be completed by one-step reaction. The method provided by the invention can effectively solve the brittleness problem of the SiBN(C) ceramic fiber precursor, thus laying the foundation for continuous preparation and cracking of the SiBN(C) ceramic fiber precursor.

The invention discloses a SiBCN metal-free ceramic wave-absorbing material obtained from cracking conversion of benzene ring-containing polymer and a preparation method thereof, wherein the preparation method includes synthesis of benzene ring-containing hyperbranched polyborosilazane and preparation of the SiBCN ceramic wave-absorbing material. The hyperbranched polyborosilazane is synthesized bymethyl dichlorodiphenylsilazane, dichlorosilazane, boron trichloride and hexamethyldisiliazide, then the hyperbranched polyborosilazane is crosslinked and tabletted into a blank body, and the blank body is cracked into the ceramic wave-absorbing material. Starting from the design of the structure of a ceramic polymer precursor, synthesis of a high ceramic yield polyborosilazane precursor and construction of a crosslinking topology system are performed, and the benzene ring is directly introduced into the structure of the polyborosilazane precursor, so that sp2 hybrid carbon atoms in the benzene ring directly form graphite carbon, carbon nanotubes and other structures in situ in cracking conversion process, the high temperature wave absorbent is uniformly dispersed in the structure of an amorphous low-loss carrier, and the metal-free ceramic based composite material with good wave absorbing properties is obtained.

The invention relates to a method for preparing a borosilazane ceramic fiber precursor, which comprises the following steps of: reacting boron trichloride (BC13) with methylamine (CH3NH2) at -80DEG C for 12 to18 hours, reacting at -40 DEG C for 12 to 18 hours to synthesize B(NHCH3)3 micromolecules, and synthesizing Si(NHCH3)4 micromolecules by silicon tetrachloride (SiCl4) and the methylamine (CH3NH2); and removing excessive methylamine from the two type of micromolecules, filtering, mixing, condensing at the temperature of between 135 and 165 DEG C to obtain the precursor with good filament picking effect. The method has the advantages of low cost of raw materials, pure product, and high synthetic yield; and the prepared ceramic fiber precursor is heated to 1,700 DEG C in the ammonia atmosphere, the obtained product has the carbon content of less than 0.05 percent through element analysis, and has good wave permeability and good application prospect.