130results about "Boron/borides" patented technology

In hexaboride particles having particles of a hexaboride of at least one element (X) selected from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sr and Ca, or a dispersion of such particles, the surfaces of the hexaboride particles have physically been coated with a surface treatment agent containing silicon, selected from a silazane type treatment agent, a chlorosilane type treatment agent, an inorganic treatment agent having at least one alkoxyl group in the molecular structure, and an organic treatment agent having at least one alkoxyl group at a molecular terminal or in the side chain, or have been coated with the surface treatment agent, having chemically combined with hexaboride particles on the surfaces of the hexaboride particles.

An ion source(s) is configured to generate ions from one or more elements including a plurality of different isotopes or unique molecular combinations of two or more different isotopes from at least one of the selected elements. A selection filter(s) directs a subset of the ions onto a catalytic transmembrane to grow nanotubes of a specific isotope composition on the opposite side of the transmembrane. The nanotubes may be uniformly or selectively doped with dopant atoms. A controller can configure the selection filter(s) to sequentially pass different subsets of ions to form isotope, molecular or element junctions in the growing nanotubes.

In a refining method for boron-containing silicon, boron-containing silicon is irradiated with an electron beam in a vacuum vessel to melt the boron-containing silicon. A boron compound-forming substance is introduced into the vacuum vessel, and boron contained in the molten silicon is formed into a boron compound. After at least a portion of the boron compound has vaporized, irradiation with the electron beam is stopped. The high-purity molten silicon can then be solidified.

An enriched method of iron and boron by using low-grade ferroboron ore pertains to the field of iron-smelting, in particular to an enriched method of iron and boron by using low-grade ferroboron ore, which applies for the exploitation and use of low-grade ferroboron ore. The method is characterized in that the low-grade ferroboron ore of boron content between 5 percent and 10 percent is taken as raw material and is calcined, cracked, grinded, mixed with solid reducer, baked and magnetic-picked to get the boron concentrate power of boron content between 12 percent and 15 percent and the iron concentrate power of iron content between 60 percent and 90 percent. Consequently, the limited resource of boron and iron is sufficiently used, which has great significance for both the society and economic benefit.

A technique for boron implantation is disclosed. In one particular exemplary embodiment, the technique may be realized by an apparatus for boron implantation. The apparatus may comprise a reaction chamber. The apparatus may also comprise a source of pentaborane coupled to the reaction chamber, wherein the source is capable of supplying a substantially pure form of pentaborane into the reaction chamber. The apparatus may further comprise a power supply that is configured to energize the pentaborane in the reaction chamber sufficiently to produce a plasma discharge having boron-bearing ions.

Methods of controlled hydrolysis/alcoholysis and regeneration of a borohydride are disclosed. Examples of the present invention show that hydrolysis of sodium borohydride or lithium borohydride with dilute acid provides simultaneous generation of H₂ and boric acid for recycling. Other examples of the present invention show methods for regenerating a borohydride by reacting an aluminum hydride to a borate compound to provide a regenerated borohydride.

The invention relates to an apparatus for producing nanotubes, the apparatus being adapted to produce doped and/or undoped single-walled or multi-walled nanotubes, the apparatus comprising at least a thermal reactor. In accordance with the invention, the reactor is at least of the hottest part thereof and at least partly manufactured from a material that is at least partly sublimed into the thermal reactor as a result of the thermal reactor being heated, and the sublimed material at least partly participates in the growth of the nanotubes.

The invention discloses a boron extraction technology. Brine water after extracting lithium from salt lake is used as raw paderial and 2-thyl-1,3-hexanediol respectively with mixture alcohol of isooctal alcohol and isoamyl alcohol extracts borone from the brine water and optimum processing condition for extracting boron from brine water using the mixture alcohol is obtained after performing experiments from the aspects of extractant volume fraction, acidity, phase ratio, extraction time, extraction temperature, saturation extraction volume, back washing agent concentration and back washing time: extractant volume fraction 30%, water phase pH 3, phase ratio 1:1, extraction time 10min, maximum saturation capacity 61.4g/L(B2O3).

A cleaner production method for preparing superfine powder through a self-propagating metallurgy method is carried out according to the following steps: (1) mixing and conducting ball-milling on the powdery oxide and magnesium powder, then compacting into a blank, putting the blank into a self-propagating reaction furnace to cause a self-propagating reaction, and naturally cooling to the room temperature to obtain a coarse product; (2) using hydrochloric acid to leach and separate magnesium oxide in the coarse product after breaking, and filtering to obtain a solid phase and a leaching agent; (3) washing and drying the solid phase and making the solid phase into ultrafine powder; (4) processing the leaching agent through a spray-pyrolysis mode to obtain a nanoscale magnesium oxide and pyrolysis tail gas, wherein the hydrogen chloride in the pyrolysis tail gas is absorbed to form hydrochloric acid and is circularly used back in the leaching process. The cleaner production method producing the ultrafine powder through the self-propagating metallurgy mode has the characteristics of low material cost, low energy consumption, simple operation, low requirement on process conditions and the like, and the product is high in purity, small in particle size and high in powder activity.

The invention discloses a preparation method for synthesizing boron carbide powder at a low temperature, and belongs to the field of boron carbide ceramic material. The method comprises the following steps of: mixing boric acid, glycerol and nano active carbon powder in a certain ratio by using an ultrasonic cleaner; heating the mixed liquid in a tube furnace under the condition of the heating temperature of 450 to 700 DEG C, the heat preservation time of 0.5 to 3 hours and the heating rate of 5 to 10 DEG C per minute; grinding the heated product by using an agate mortar to form granules with a granule diameter less than 1 millimeter; filling the granules into a graphite jar with screw threads, and screwing down the graphite jar; treating the graphite jar in a vacuum or argon atmosphere at a high temperature, heating the graphite jar to between 1,400 and 1,500 DEG C at a heating rate of 10 to 20 DEG C per minute, preserving the heat for 1 to 5 hours, and cooling the product along with the furnace; and screening the obtained product to obtain the boron carbide powder with the granule diameter less than 10 microns. The whole process has low energy consumption and low preparation cost, and does not introduce exogenous impurities.

The invention discloses a method for preparing pure boron, which comprises the following steps of: weighing corresponding powdery materials in a weight ratio of B2O3 to Mg of 1 to 2-3; performing ball milling and mixing on the materials for 8 to 16 hours; putting the mixture in a mould and compacting the mixture under the pressure of between 10 and 60 MPa; putting ignition powder on the surface of the mixture; then reacting the mixture in a high pressure kettle; blowing the high pressure kettle with argon gas at room temperature so as to discharge the air therein; discharging the air again when the temperature of the container is raised to 180 DEG C; introducing the argon gas of 1 to 6MPa into the container and continuing to raise the temperature of the container; raising the temperature in the container to about 260 DEG C to perform reaction on the ignition powder and release a large amount of heat so as to initiate the reaction between the reaction materials; and finally cooling the reaction product along with the furnace under the protection of the argon gas to room temperature so as to prepare the boron-containing material, wherein the boron content is more than 90 to 98 percent and the particle size is 0.1 to 10 mu m.

The invention discloses a method for separating boron isotopes by simulated moving bed chromatography. The method is used to selectively separate isotopes 10B with high thermal-neutron-absorption cross section from boric acid by simulated moving bed chromatograph with a sassolite solution as a raw material, deionized water as a mobile phase, and weak-base anion-exchange resin as a stationary phase. The method comprises the following steps of: preparing a boric acid aqueous solution with certain concentration, filtering the boric acid aqueous solution for removing impurities to obtain a sampleinjection solution for a simulated moving bed, then loading samples by the simulated moving bed, collecting condensed boric acid rich in isotopes 10B at an extraction port, and then obtaining a target product by evaporation concentration. The method for separating the boron isotopes is continuous and has high separation efficiency.

The invention discloses a synthesis method of boron hydride [NH3BH2NH3]B3H8 and belongs to the technical field of synthesis of boron hydride. The technical scheme is characterized in that ammonia borane is added to a reaction container under waterless and oxygen-free conditions, a tetrahydrofuran solution THF.B3H7 of B3H7 is added and stirred at the temperature of 0-50 DEG C for a reaction, and the target product boron hydride [NH3BH2NH3]B3H8 is prepared. The method is simple to operate, low-toxicity, harmless, safe, reliable and suitable for large-scale production.

The method for preparing boron powder by using combustion synthesis process includes the following steps: mixing boron oxide and magnesium powder according to the ratio of 1-2.5:1 (weight), under the protection of argon gas grinding them for 3-30 hr. by using high-energy mill, making the said material into blank or directly using powder material and placing it into combustion synthesis reactor, using detonating process or using resistance wire to make initiation and implement combustion synthesis reaction, after the reaction is completed, using acid to wash and remove magnesium oxide so as to obtain the boron powder whose purity can be up to 90-97%.

The invention provides a method for purifying amorphous rough boron powder through pressurizing and leaching. The method comprises the following steps of: adding diluted hydrochloric acid of a certain proportion to the amorphous rough boron powder, heating and pressurizing during mixing, and carrying out leaching reaction; and naturally cooling down to room temperature to obtain a mixture, filtering the mixture, cleaning filter residue by water, drying and sieving to obtain amorphous boron powder with purity of more than 97%, wherein the contents of impurities, such as Mg, O, Si, Fe and the like are respectively below 0.9%, 0.2%, 1.0% and 0.3%. According to the method for purifying the amorphous rough boron powder through pressurizing and leaching, disclosed by the invention, the purification of rough boron is carried out by a hydrometallurgy pressurizing leaching method, thus the purification process is simple, the cost is low, the additional value is high and the purity of boron power can be over 97%. The method for purifying the amorphous rough boron powder through pressurizing and leaching, disclosed by the invention, has the advantages of novel technique, innovativeness and high additional value, and can solve a problem that the purity of the amorphous boron powder prepared by the current thermal magnesium reduction method is too low.