64results about How to "High in boron" patented technology

The invention relates to a smelting method for stably increasing the content of boron in boron-containing steel. The smelting method is characterized in that high-carbon ferromanganese, high-carbon ferrochromium and iron-core aluminum are subjected to the deoxidation alloying in the steel tapping process of a converter, and a whole-course bottom argon blowing and wash heat technology is adopted for reducing oxygen content and nitrogen content in the steel; after steel tapping is completed, molten steel is lifted to an argon station, and the molten steel is converted to an LF (Ladle Furnace) after ferroaluminium is added for adjusting the activity of oxygen in the steel to a required control range; and submerged arc operation, soft argon blowing control, a deep deoxidation technology and a titanium alloy technology are adopted for refining in the LF, then boron alloying is carried out, and later the long-time soft argon blowing is carried out, thus the recovery rate of boron in the steel reaches 82%-86%, the problems of low and instable recovery rate of boron are solved, the fluctuation quantity between the furnaces is less than 0.0005%, the ideal control level is achieved, the dependence of boron alloying on vacuum refining is eliminated, and the requirement of subsequent process for the quality of the boron-containing steel is ensured.

The invention relates to a preparation method of room-temperature regenerated phenolic resin and a recycling technology and application thereof. The preparation method comprises the following steps of according to parts by mass, melting and blending 100 parts of thermoplastic phenolic resin and 18.4 to 55 parts of boric acid compound at the temperature of 60 to 100 DEG C, so as to obtain boron-containing thermoplastic phenolic resin; or, dissolving 100 parts of thermoplastic phenolic resin and 20 to 50 parts of boric acid compound into an organic solvent with low boiling point at the temperature of 40 to 60 DEG C, so as to obtain the boron-containing thermoplastic phenolic resin; curing, so as to obtain the room-temperature regenerated phenolic resin. The preparation method has the advantages that the preparation technology of the resin is simple; the resin is dissolved into the mixing solvent of ethyl alcohol and water at room temperature, so that the resin can be recycled; the resin can be used for preparing the recyclable fiber reinforced boron-containing thermoplastic phenolic resin-based composite material. The prepared boron-containing thermoplastic phenolic resin has the advantages that the function of arylboronic acid ester structure promoting the heat-resistant property of the thermoplastic phenolic resin is fully realized, and the technology of the resin and the mechanical property of the composite material can be simultaneously realized.

The invention discloses a smelting technology of ultralow boron steel, and belongs to the technical field of steel smelting. The smelting technology specifically comprises the stages of KR molten ironpretreatment, converter smelting, LF refining, pouring, cast blank stack cooling and cleaning, heating and rolling and steel plate stack cooling. According to the smelting technology, the boron content in molten steel can be controlled to be 0.0005% or below, the smelting requirements of the ultralow boron steel can be completely met, according to a prepared steel plate, the yield strength is higher than or equal to 462 MPa, the tensile strength is higher than or equal to 560 MPa, the ductility is higher than or equal to 25%, the impact strength at the temperature of minus 40 DEG C can reach186 J or above, and the overall performance is excellent.

Processes for the rapid and efficient drying of boron-containing compounds, in particular boron-containing minerals and ores, are described, as well as the products which result from such processes. The process comprises the steps of providing a boron-containing material; introducing the boron-containing material into a pre-heated furnace; heating the boron-containing material in the furnace at a temperature between about 800° F. and 1000° F.; retaining the boron-containing material within the furnace for a time ranging from about 5 minutes to about 120 minutes; and removing the boron-containing material from the furnace and allowing it to cool to ambient temperature. Optionally, the process may also comprise one or more steps of grinding and/or sizing the boron-containing material to a specific particle size prior to the introduction of the material to a furnace. The boron-containing compounds that can be processed in this manner include both naturally-occurring and/or synthetic boron-containing materials, in particular boron-containing minerals and ores such as colemanite, ulexite, probertite, kernite, and mixtures thereof.

The invention relates to a method for regulating and controlling thickness of an iron-based amorphous alloy strip. According to the method, the thickness of the iron-based amorphous alloy strip is regulated and controlled by utilizing a method of iron-based alloy melt composition and heat treatment temperature under the condition of not changing rapid solidification process conditions so as to reduce the preparation difficulty of the thick iron-based amorphous alloy strip. The method has the characteristics of low implementation cost, high efficiency, high controllability and repeatability, high technical reliability and the like, and is suitable for wide application in the technical field of metal functional material preparation.

A preparation method of boron doped graphene comprises the steps of: oxidizing graphite to obtain the graphite oxide; dispersing the graphite oxide in deionized water, conducting ultrasonic treatment for 1-3 h, filtering and drying to obtain the graphene oxide; mixing the graphene oxide with potassium hydroxide, placing the mixture in an inert gas atmosphere, heating to 800-1000 DEG C, insulating for 1-2 h, and cooling to room temperature to obtain a first mixture; removing oxides of potassium, washing and drying to obtain graphene; mixing the graphene with boron trioxide, placing the mixture in an inert gas atmosphere, heating to 800-1300 DEG C, insulating for 0.5-3 h and cooling to room temperature to obtain a second mixture; and removing residual boron trioxide, washing and drying to obtain boron doped graphene. By adopting the preparation method, boron doped graphene with high boron content can be obtained.

The invention relates to a preparation method of a boronized silicon nitride fiber. The preparation method comprises the steps of firstly preparing a high-activity Si-N fiber by transforming an infusible polycarbosilane fiber, carrying out dehydrogenation coupling reaction on excessive N-H in the high-activity Si-N fiber and B-H compounds generated by virtue of pyrolysis of boron hydrides so as to chemically introduce an element B, and carrying out boron hydrides in ammonia gas, so as to prepare the boronized silicon nitride fiber. Compared with the prior art, the boronized silicon nitride fiber prepared by virtue of the preparation method is relatively high in boron content, nitrogen content and fiber strength and relatively uniform in boron distribution. The preparation method has the advantages that the process is simple and convenient, and the cost is low. Compared with SiBN fiber prepared by virtue of a polyborosilazane precursor route, the preparation method has relatively great cost advantage and is applicable to large-scale production, and existing decarburization-nitridation systems do not need to be changed.

The invention discloses an epoxy-resin-based neutron shielding material and a method for preparing the same. The epoxy-resin-based neutron shielding material is prepared from epoxy resin matrix composite boron carbide fillers. Epoxy resin for the epoxy-resin-based neutron shielding material is o-cresol-formaldehyde epoxy resin, a curing agent is phenolic resin, and a curing accelerator is imidazole or an imidazole compound. The epoxy-resin-based neutron shielding material and the method have the advantages that the epoxy-resin-based neutron shielding material which is an epoxy resin/boron carbide composite material prepared by the aid of the method is excellent in neutron shielding performance; processes are easy to operate and popularize and low in cost.

The invention discloses an ultraviolet-transmitting high-boron glass tube, which is prepared from the following raw materials by weight: 20-25 parts of boric acid, 12-18 parts of borax pentahydrate, 8-18 parts of anhydrous borax, 1-4 parts of aluminum hydroxide, 60-65 parts of quartz sand, 0.4-0.7 part of tartaric acid and 0.2-0.5 part of titanium oxide. The ultraviolet-transmitting high-boron glass tube provided by the invention has the characteristics of uniform outer diameter and wall thickness, good lamp working performance, high ultraviolet transmittance and the like; the preparation method comprises the following steps of: (1) uniformly mixing boric acid, borax pentahydrate, anhydrous borax, aluminum hydroxide, quartz sand, tartaric acid and titanium oxide, adding the mixture into anelectric melting furnace, completely melting the mixture into molten glass at 1480-1520DEG C, cooling the molten glass to 1000-1100DEG C, and enabling the molten glass to flow into a rotating pipe ofa forming machine; and (2) enabling the molten glass in the rotating pipe in the step (1) to enter a heat preservation box for homogenizing forming, then enabling the molten glass to flow into a cooling runway of 400-600DEG C, and enabling the molten glass to enter a dragger for drawing and cutting, thus obtaining the ultraviolet-transmitting high-boron glass tube. Standardized production of continuous feeding and continuous drawing is achieved through a Danla method (parallel drawing method).

The invention relates to a preparation method of a boronized ashless dispersant. The method comprises the following steps that firstly, an amine compound and epoxy glycidol are subjected to a ring-opening reaction to prepare an intermediate product amine; then, polyisobutene maleix anhydride, basic oil and the intermediate product amine are subjected to a reaction, and polyisobutene succinimide is prepared; finally, the polyisobutene succinimide, a boron compound and a solvent are subjected to a reaction to prepare the boronized ashless dispersant. According to the preparation method, the boron content, the hydrolytic stability and the low-temperature oil sludge dispersion performance of the boronized ashless dispersant are improved, and the product can be used for internal combustion engine oil, gear oil, transmission fluid and other lubricating oil.

Disclosed is a preparation method of a boron-doped silicon nitride fiber. The preparation method comprises: preparing a high-activity Si-N fiber by adopting conversion of a dis-molten polycarbosilane fiber; realizing chemical introduction of the B element by utilizing HX elimination reaction between spare N-H in the high-activity Si-N fiber and borazine containing a B-X (X=H, Cl, Br, and I) bond; and performing nitridation in ammonia gas to prepare the boron-doped silicon nitride fiber. Compared with the prior art, the boron-doped silicon nitride fiber prepared through the method in the invention is relatively high in boron content, nitrogen content, and fiber strength, and is uniform in dispersion. According to the invention, the technology is simple; the cost is low; and no change is needed in a current decarburization-nitridation system, so that the preparation method is suitable for mass production.

The invention discloses a three-dimensional continuous network hydrophilic boron-doped diamond radiator and a preparation method and application thereof. The hydrophilic boron-doped diamond radiator comprises a three-dimensional continuous network metal framework, a diamond layer and a boron-doped diamond layer, the diamond layer is arranged on the surface of the three-dimensional continuous network metal framework, the boron-doped diamond layer is arranged on the surface of the diamond layer, the boron content in the boron-doped diamond layer is gradually increased from bottom to top, and micropores and/or pointed cones are distributed on the surface of the boron-doped diamond layer. According to the three-dimensional continuous network hydrophilic boron-doped diamond radiator and the preparation method and application thereof, the diamond film layer with excellent heat conduction performance is prepared on the surface of the three-dimensional continuous network metal framework firstly, then the boron-doped diamond layer with function modification performance is arranged on the surface of the diamond film layer, gradient setting is carried out during boron doping, trace boron doping is adopted for the bottom layer making contact with the diamond layer, purity is kept, and heat conductivity is guaranteed, then the boron doping concentration is gradually increased, so that the top layer adopts the relatively high boron content, and high-temperature heat treatment is used in combination to obtain excellent hydrophilicity.

The invention discloses a surface treatment method for a nuclear reactor waste container. The method includes the following steps of S1, mixing Al alloy and B<4>C powder in the mass ratio of 5-7% to 30-95% for 60-240 min by using a high-speed mixer to obtain mixed powder; S2, carrying out ultrasonic screening on the surface of the mixed powder obtained in the S1 by using ultrasonic waves to obtainB<4>C/Al composite particles; S3, directly spraying the B<4>C/Al composite powder in the S2 onto the surface of the nuclear reactor waste container through a spray gun by adopting a hypersonic flamespraying method to obtain a layer of B<4>C/Al composite coating, and then repeatedly spraying the B<4>C/Al composite powder back and forth on the surface of the nuclear reactor waste container throughthe spray gun to stack the B<4>C/Al composite coatings layer by layer, wherein the thickness of each layer of the B<4>C/Al composite coating is 10-20 micrometers. The structural strength requirementof the container is met, the aim of radioactive shielding is achieved, the bonding force of the B<4>C/Al composite coatings to the nuclear reactor waste container and the density of the B<4>C/Al composite coatings are improved, the porosity of the B<4>C/Al composite coatings is reduced, and it is ensured that B<4>C is uniformly dispersed.

The invention discloses a modified phenolic resin for friction materials and a preparation method thereof, belonging to the technical field of modified phenolic resins. The preparation method comprises the following steps: (1) cardanol-formaldehyde reaction: mixing cardanol, catalyst A and formaldehyde , react at a temperature of 50-80°C for 0.5-5h, then add phenol in batches, after reacting for 1-5h, under a vacuum of 0.02-0.04MPa and a temperature of 60-90°C, dehydration under reduced pressure for 0.5-2h; (2) Polymerization reaction: add boric acid, nano ZrO2 and catalyst B to the product obtained in step (1), at a temperature of 100-110°C, a vacuum of 0.05-0.08MPa, dehydration reaction under reduced pressure for 1-5h, and heat up After reaching 120-160°C, the material is discharged to obtain the finished product. The modified phenolic resin prepared by this method is applied to friction materials, which can make the friction materials have excellent thermal properties, mechanical properties and friction properties.

A coated tool has a substrate and a hard material coating deposited on the substrate. The hard material coating has a layer structure in the following order, starting from the substrate: a titanium nitride layer, a titanium boron nitride transition layer, and a titanium diboride layer. The titanium boron nitride transition layer has a boron content that increases from the titanium nitride layer in the direction of the titanium diboride layer. The boron content does not exceed 15 at %.