158 results about "Boron" patented technology

The invention discloses a neodymium-iron-boron magnet with double main phases and light rare earth diffusion based on asymmetric cerium distribution and a preparation method, and relates to the technical field of neodymium-iron-boron magnets. The method comprises the steps that a diffusion matrix is prepared through a double-main-phase technology, in the double-main-phase technology, the components of a main-phase alloy and an auxiliary-phase alloy are RaCebFe100-a-b-c-dMcBd, R is PrNd alloy or Nd metal, M is at least one of Cu, Al, Zr, Co and Ga, the content of Ce in the main-phase alloy is larger than that of Ce in the auxiliary-phase alloy, then the upper surface and the lower surface of the diffusion matrix are coated with a diffusion source solution, and the diffusion matrix is obtained through heat treatment. Carrying out heat treatment and aging treatment to obtain a neodymium-iron-boron magnet; the diffusion source solution is formed by mixing a diffusion source and a solvent, and the diffusion source is (PrmNdn) aAlbCucZrdCoeMgf. The neodymium-iron-boron magnet obtained through the method has high residual magnetism and high coercive force at the same time, the diffusion efficiency of the diffusion source is high, and the rare earth utilization rate is increased.

The invention relates to the technical field of data processing, in particular to a boron-11 electronic gas analysis method for trace impurity recognition, which comprises the following steps: acquiring a historical time sequence data sequence of the concentration of each gas phase element in a container for storing boron-11 electronic gas at the current monitoring moment; periodically dividing each historical time sequence data sequence to obtain suspected abnormal data in each data segment; according to suspected abnormal data in the recent time sequence data sequence of each gas phase element concentration, the recent monitoring data distribution change abnormal degree and the multi-type correlation change abnormal degree of each gas phase element concentration are obtained, and a self-adaptive concentration threshold value at the current monitoring moment is correspondingly obtained; according to the self-adaptive concentration threshold value corresponding to the concentration of each gas phase element, trace impurity abnormity monitoring is carried out on the boron-11 electron gas at the current monitoring moment, and the accuracy of trace impurity abnormity monitoring is improved by dynamically adjusting the fixed threshold value.

The invention provides an under-water discharge machining system and method for a radiation environment. The under-water discharge machining system comprises a pulse power supply control system, an electric spark machining head device and a servo control system. The pulse power supply control system comprises a power supply control box, a rectifier and a power amplifier which are electrically connected in sequence. And the power amplifier is electrically connected with the servo control system and the electric spark machining head device. The electric spark machining head device is provided with a feedback signal wiring connected to the servo control system. The pulse power supply control system is matched with the servo control system to drive the electric discharge machining head device to guarantee the process of the workpiece to be machined, so that the problem that conventional electric discharge machining equipment cannot be used in the high-radiation and boron-containing water environment is solved.

The invention provides a grain boundary diffusion neodymium iron boron magnet and a preparation method thereof, and relates to the technical field of magnetic materials. The preparation method comprises the steps of surface pretreatment and purification, precise diffusion source construction through magnetron sputtering and diffusion promotion through vacuum heat treatment. The core function of pretreatment is to remove surface impurities and lay a foundation for subsequent deposition of alloy films; the proportion of Tb, Al and Cu in a diffusion source is accurately regulated and controlled in the magnetron sputtering stage, and the synergistic effect is achieved; and the vacuum heat treatment promotes Tb to diffuse into the neodymium iron boron. According to the method, a technical closed loop with pretreatment as a basis, a diffusion source as a core and heat treatment as power is formed, the microstructure of the neodymium-iron-boron magnet is optimized, a complete and continuous shell structure with the moderate thickness is formed, the diffusion depth of heavy rare earth is greatly increased, and the service life of the neodymium-iron-boron magnet is prolonged. Finally, the coercive force of the neodymium-iron-boron magnet is remarkably improved, and the utilization rate of heavy rare earth elements is effectively improved. The problem of low Tb utilization rate in the prior art is solved, and the bottleneck of coercive force improvement is broken through.

The invention discloses a preparation method of a sintered neodymium-iron-boron magnet without heavy rare earth, Pr-Fe-B-M alloy is used as an auxiliary phase alloy, LRe-Fe-B-M alloy is used as a main phase alloy, the auxiliary phase alloy is used for preparing a magnet matrix and performing grain boundary diffusion at the same time, the magnet without heavy rare earth is prepared, praseodymium element is non-uniformly distributed in the magnet, and rare earth element is not uniformly distributed in the magnet. The Pr content of part of the main phase is higher than the overall average content, the crystal boundary praseodymium content is higher than the overall average content, and the magnet surface praseodymium content is higher than the overall average content. The coercive force and the temperature stability of the magnet are improved, the magnet can still keep excellent magnetic performance under the condition that Dy and Tb are not contained, heavy rare earth elements such as Dy and Tb which are scarce in resource and high in price are prevented from being used, the high performance of the magnet is guaranteed, the production cost is reduced, and the resource utilization efficiency is improved.

The invention discloses a neodymium-iron-boron rare earth permanent magnet, a preparation method and use thereof. The neodymium-iron-boron rare earth permanent magnet comprises: R: 28.5-33 wt %, wherein RL comprises Pr, Pr≥14 wt %, and RH comprises one or more of Dy, Tb, Gd and Ho; Co: 12-20 wt %; Al: 0.5-1.5 wt %; X: 0.3-1.5 wt %; B: 0.88-1.05 wt %; and a balance of Fe, the microstructure thereof comprises a main phase M, a grain boundary phase A and a grain boundary phase B; the main phase M is R2(Fe, Co)14B having a volume percentage of 90-94%; the grain boundary phase A is R(Fe, Co)2 having a volume percentage of 5-8%; and the grain boundary phase B is R4(Fe, Co)3 having a volume percentage of 1-2%. The neodymium-iron-boron rare earth permanent magnet has a high Co content, a high Curie temperature, a low temperature coefficient, good mechanical properties, a high magnetic energy product and a high coercive force.

A boron dose measurement system, method and apparatus. The system is provided with a first detection apparatus (10), a second detection apparatus (20) and a boron dose measurement apparatus (30), wherein the first detection apparatus (10) detects gamma rays in a target region, in order to obtain first boron measurement information, the first boron measurement information comprising energy spectrum information of the gamma rays; the second detection apparatus (20) detects the gamma rays in the target region, in order to obtain second boron measurement information, the second boron measurement information comprising position information of the gamma rays; the second detection apparatus (20) and the first detection apparatus (10) synchronously perform measurement; and the boron dose measurement apparatus (30) can determine a boron dose distribution in the target region on the basis of the energy spectrum information and the position information of the gamma rays that are obtained by means of synchronous measurement. A boron dose distribution in a target region can be accurately obtained, and the obtained boron dose distribution can meet the requirements for online boron dose monitoring.

The invention relates to a vessel for the long-term storage of DNA in space at a constant temperature of -196 °C. The aim is to protect biological samples – especially DNA – for decades to centuries from the extreme environmental conditions of space, including vacuum, intense radiation, extreme temperature fluctuations and mechanical stresses. The vessel has a three-layered structure: 1. Inner chamber made of boron nitrogen nanotubes (BNNTs) that offer outstanding protection against cosmic radiation, high mechanical strength, chemical inertness and temperature resistance. 2. Middle insulating layer made of aerogel that minimizes heat exchange and keeps the cryogenic temperature constant. 3. Outer protective layer made of titanium, which protects against micrometeorites, It protects against physical impacts and corrosion. Technical advantages: • Long-term stability of DNA through consistently low temperatures. • Effective radiation protection against cosmic and solar radiation. • Excellent thermal insulation thanks to aerogel. • Mechanical robustness due to titanium. Areas of application: • Securing and archiving genetic material for research, space travel and long-term preservation. • Provision of DNA for future scientific or biological restoration projects. Special feature: The capsule is compact, space-compatible, and can be used as part of space missions, space stations, or interplanetary projects.

The invention provides a preparation method of goethite-boron complex minerals for soil improvement, and belongs to the technical field of preparation of artificial minerals for soil improvement, the preparation method comprises the following steps: 1, mixing solutions; 2, stirring the mixed solution; 3, dropwise adding a sodium hydroxide solution; step 4, centrifugal washing; 5, drying the precipitate; and 6, grinding and screening. According to the goethite-boron composite artificial mineral prepared through the method, the boron loss rate is reduced, the boron slow release performance is improved, the ecological environment effect is improved, the boron fertilizer utilization efficiency is improved, iron nutrition is synchronously provided, and the iron deficiency symptom of calcareous soil is relieved.

The invention belongs to the technical field of rare earth permanent magnet material preparation, and relates to a heavy-rare-earth-free high-performance sintered neodymium-iron-boron magnet and a preparation method thereof. By regulating and controlling the total amount of rare earth and the content and proportion of key elements such as B, zirconium, copper and gallium and matching with a specific three-stage aging process, formation and uniform distribution of an R6 (FeCo) 13M phase are effectively promoted, and high coercive force and excellent demagnetization stability are stably obtained under the condition that heavy rare earth is not contained completely.

This invention discloses a high-boron Y–Ce–Co co-substituted nanocrystalline material and its preparation method. The general chemical formula of the nanocrystalline material, expressed as a percentage by mass, is: [RE x (Y y Ce 1‑y ) 1‑x ] z Fe 100‑z‑u‑v‑w Co u M v B w The composition is defined as follows: 0 ≤ x ≤ 0.9, 0.05 ≤ y ≤ 0.9, 25 ≤ z ≤ 35, 5 ≤ u ≤ 50, 0 ≤ v ≤ 3, 1.7 ≤ w ≤ 3. This invention utilizes Y–Ce–Co co-substitution to synergistically regulate the lattice occupancy, elemental valence states, and magnetic exchange interactions of the main phase, significantly improving the temperature stability of the Ce-rich system. Addressing the issues of abnormal grain growth and excessive Laves phase precipitation caused by Co introduction, increasing the mass percentage of B significantly enhances the alloy's amorphous forming ability, refines the main phase grains, and suppresses the formation of harmful second phases. Based on this compositional design, a low-linear-velocity melt rapid quenching process (12 to 18 m / s) can directly prepare materials with uniform nanocrystalline structures without subsequent crystallization annealing, achieving high coercivity and high temperature resistance while significantly reducing raw material costs.

The application discloses a neodymium-iron-boron magnet material and a preparation method thereof, and an electronic device containing the same. The neodymium-iron-boron magnet material comprises the following components: R: 28.0-32.0 wt%, R comprises Nd, R further comprises Tb and / or Dy, the content of Nd is greater than or equal to 27.0 wt%; Cu: 0.16-0.40 wt%; Ga: 0.07-0.24 wt%; Al: less than or equal to 0.10 wt%; B: 0.96-1.10 wt%; Co: 0.15-2.0 wt%; M: 0.10-0.25 wt%, M is selected from at least one of Ti, Zr and Nb; and a phase with a chemical composition of R w Fe 100‑w‑x‑y‑z Co x Cu y Ga z is contained in the two-particle grain boundary of the neodymium-iron-boron magnet material. The neodymium-iron-boron magnet material in the application can realize a significant improvement in coercive force under the condition of adding a small amount of heavy rare earth element Tb, while maintaining a high remanence and squareness.

The invention belongs to the technical field of neodymium-iron-boron magnets, and relates to a neodymium-iron-boron magnet preparation method based on matching of powder particle size and main phase grain size, which comprises the following steps: (1) preparing a neodymium-iron-boron alloy rapid hardening sheet by adopting a rapid hardening process; the main phase is a columnar crystal, and the average size of the short axis of the main phase is 2.1-3.4 microns; (2) sequentially carrying out hydrogen decrepitation and jet milling on the neodymium-iron-boron alloy rapid hardening sheet to obtain neodymium-iron-boron powder; the difference value between the D50 particle size of the neodymium iron boron powder and the average size of the short axis of the main phase is less than or equal to 1 mu m; and (3) carrying out orientation molding, compression molding, sintering treatment and tempering treatment on the neodymium-iron-boron powder to obtain the high-performance sintered neodymium-iron-boron magnet. According to the method, the average size of the main phase short axis in the rapid hardening sheet is effectively matched with the D50 particle size value of the neodymium iron boron powder by accurately controlling the rapid hardening and powder manufacturing process, it is ensured that a complete and uniform rare earth-rich phase coating layer is formed on the surface of the neodymium iron boron particle, and the microstructure is optimized from the source.

This application discloses a method for offline analysis of powder ionization conditions, comprising the following steps: placing a silicon wafer on a target plate of a plasma device; generating a plasma beam under preset powder ionization conditions using the plasma device; injecting powder into the plasma device so that the plasma beam bombards the powder until powder injection is complete; detecting whether a first condition and a second condition are met, wherein the first condition includes at least 70% of the powder injected into the plasma device ablation and brightening upon bombardment by the plasma beam and / or forming a coating on the silicon wafer; the second condition includes the coating containing chemical bonds formed by elements of the powder and / or detecting spectral lines generated by ionization of the powder upon bombardment by the plasma beam. If the first and second conditions are met, the powder is determined to be effectively ionized. Otherwise, the powder is determined to be ineffectively ionized. The method of this application can obtain basic research data on the boronization of boron powder.

The application provides a full-core fouling deposition prediction method and device based on a porous medium model. The method comprises the following steps: S1, modeling a pressurized water reactor core as a porous medium model and performing regular coarse grid division; S2, solving the porous medium model based on a core power distribution obtained in a previous iteration step to obtain a flow field and a phase field distribution at the current iteration step; S3, calculating a fuel rod cladding surface temperature based on the core power distribution and the flow field and the phase field distribution; S4, calculating a phase change mass transfer rate by using a boiling phase change rate model based on the cladding surface temperature and local thermal parameters; S5, calculating a fouling deposition rate by using a deposition model based on total mass balance based on the phase change mass transfer rate; S6, calculating a fouling deposition mass and a boron compound mass according to the fouling deposition rate; and S7, performing neutron calculation by taking the fouling deposition mass and the boron compound mass as input to obtain an updated core power distribution.

The invention relates to a single event effect sensitivity detection method and device, equipment and a storage medium. The method comprises the following steps: acquiring a to-be-analyzed area of a to-be-detected sample; emitting a primary ion beam to the to-be-analyzed area through a secondary ion mass spectrometer; the primary ion beam is used for exciting an area to be analyzed to generate secondary ions; determining the target signal intensity of the to-be-analyzed area according to the mass-to-charge ratio and the signal intensity of the secondary ions received by the secondary ion mass spectrometer; and under the condition that the boron-10 isotope content corresponding to the target signal intensity is higher than a preset threshold value, determining that the to-be-detected sample is sensitive to the thermal neutron single event effect. By adopting the method, the detection cost can be reduced while the detection accuracy is ensured.

The invention discloses a method for preparing a high-performance cerium neodymium iron boron magnet based on a powder modification process, and belongs to the technical field of rare earth permanent magnet materials. The component-process collaborative optimization strategy is characterized in that a proper low-melting-point rare earth alloy diffusion source is selected and a magnetic powder rotating coating process is combined according to the change characteristics of magnetocrystalline anisotropy fields HA in main phase grain cores with different Ce substitution amounts based on magnet component design; and a high-HA magnetic hardening shell layer is constructed on the surface layer of the main phase crystal grains in situ. Therefore, by regulating and controlling the components of the shell layer, the HA in the core and the HA in the shell layer reach a dynamic synergistically enhanced balance state, and the synchronous reversal of the core-shell structure in the demagnetization process is ensured, so that the demagnetization process is inhibited to the greatest extent, and the coercive force of the magnet is improved.

A neodymium-iron-boron magnetic material, a preparation method therefor and an application thereof. The neodymium-iron-boron magnetic material comprises the following components in percentage by mass: 29.5-31.5 wt. % of R, where RH>1.5 wt. %; 0.05-0.25 wt. % of Cu; 0.42-2.6 wt. % of Co; 0.20-0.3 wt. % of Ga; 0.25-0.3 wt. % of N; 0.46-0.6 wt. % of Al, or alternatively Al is less than or equal to 0.04 wt. % but is not 0; 0.98-1 wt. % of B; and 64-68 wt. % of Fe; wherein R is a rare-earth element and comprises Nd and RH, RH is a heavy rare-earth element and comprises Tb, and a mass ratio of Tb to Co is less than or equal to 15 but is not 0. The neodymium-iron-boron magnetic material has higher Hcj and Br, and lower absolute values of temperature coefficients of Br and Hcj.

A novel synthetic crystalline molecular sieve material, designated boron ITQ-21, is provided. The boron ITQ-21 can be synthesized using an N,N-diethyl-5,8-dimethyl-2-azonium bicyclo [3.2.2] nonane cation as a structure directing agent. The boron ITQ-21 may be used in organic compound conversion reactions and / or sorptive processes.

According to various embodiments, a chemical compound of boron with carbon is used as a target material for forming a layer (220) by means of a plasma to which the target material is exposed.

A chemical oxidation-nucleation granulation integrated device for removing and recycling boron in water is divided into an inner cylinder and an outer cylinder, the outer cylinder is a pre-oxidation reaction tank, and the inner cylinder is a nucleation granulation reactor. The water to be treated enters from the top of the outer cylinder, and an oxidizing agent and an alkaline substance are added for pre-oxidation. The water outlet at the bottom of the outer cylinder enters the inner barrel nucleation granulation reactor under the action of water pressure. By adding a precipitant, the coagulation of boron on the surface of the crystal seed is improved, the boron is induced to crystallize and nucleate rapidly and densify, and the content of boron in the water is reduced. The present application can realize efficient removal of boron in water. Compared with the traditional coagulation and sedimentation method, the present application not only reduces the dosage of reagents, but also reduces the sludge production, improves the treatment efficiency, precipitates boron in the form of crystals, facilitates subsequent recycling of boron, improves the water quality of the effluent, avoids waste of boron resources, and realizes maximum utilization of resources.

The present invention relates to use of boron derivatives as therapeutics in Leishmaniasis disease. The objective of the present invention relates to the use of sodium perborate tetrahydrate (SPT), which is almost completely effective on Leishmania parasites, but does not show toxicity in healthy cells, in antileishmanial therapy. Considering the methods and techniques which have been developed, the success achieved in the use of SPT and boron derivatives as therapeutics against Leishmaniasis observed within the scope of the invention lays the groundwork for treatments of other infectious diseases and enables the design and development of novel preventive and therapeutic methods. There is provided a novel treatment that can be an alternative to conventional drug therapies (such as amphotericin B antimonials) applied in the treatment of Leishmaniasis, which have difficult patient compliance due to side effects.

The invention discloses a metal intercalation boron-carbon superconducting material GeB2C2 under normal pressure and a preparation method of the metal intercalation boron-carbon superconducting material GeB2C2. The material has a two-dimensional Kagome lattice structure, the space group is P6 / mmm (No.191), the lattice constants are a = b = 2.732, and c = 16.784. Through calculation and prediction of a first principle, the material has a superconducting transition temperature of about 48 K under a normal pressure (0 GPa) condition, and is dynamically stable. The superconducting mechanism is derived from a strong electroacoustic coupling effect, and the coupling constant lambda is about 1.64. The material is composed of Ge, B and C elements rich in earth crust, the raw materials are easy to obtain, the cost is low, and the large-scale preparation potential is achieved. Compared with a traditional normal-pressure superconducting material, the material disclosed by the invention has a relatively high superconducting transition temperature; compared with a high-voltage superconductor, a high-voltage environment is not needed, and the preparation and application threshold is remarkably reduced. The material can be applied to the fields of high-performance superconducting filters, superconducting nanowire single-photon detectors, small superconducting magnets and the like, and has important scientific research values and good practical application prospects.

A boron nitride material according to the present disclosure includes a 2 or more hexagonal boron nitride, and a carbazole ring-containing compound attached to at least a portion of the surface of the 2 or more hexagonal boron nitride. The boron nitride material is in a scale shape. The two or more hexagonal boron nitrides each have a scaly shape.

A positive electrode material, a preparation method thereof and application thereof are provided. The positive electrode material includes secondary particles formed by the agglomeration of primary particles, and each of the primary particles includes an active material having a chemical formula of LiMz(MnxFe1-x)1-z(BO3)y(PO4)1-y, where M includes at least one of Mg, Ti, Nb, Al, Ni, and a rare earth element, 0.4≤x≤0.7, 0.0025≤y≤0.01, and 0≤z≤0.003; boron element in the primary particles has a mass percentage of 0.5% to 1%, and B—O bonds are provided between adjacent primary particles. In the positive electrode material, by introducing boron element into the active material, B—O bonds are formed between adjacent primary particles in the positive electrode material. The fluxing effect of the B—O bonds may enhance the compactness between the primary particles, reduce the spacing between adjacent primary particles.

The invention discloses a preparation method for growing large-size isotope hexagonal boron nitride at normal pressure and high temperature and application of the large-size isotope hexagonal boron nitride in neutron detection, and the method comprises the following steps: uniformly mixing nickel powder, chromium powder and boron powder to obtain a mixture of boron and nickel-chromium alloy; then carrying out deoxidation treatment under the protection gas flow; reducing the pressure of the system, introducing mixed gas of protective gas and reactive protective gas to normal pressure, and protecting; finally, the deoxidized mixture is subjected to secondary stepped heating, heat preservation is carried out after primary heating, and the temperature of primary heating is higher than that of secondary heating; and naturally cooling to room temperature to generate the hexagonal boron nitride crystal. According to the method, the nickel-chromium alloy is adopted as the metal fluxing agent, the large-size and high-quality isotope hexagonal boron nitride single crystal is successfully prepared under the normal pressure condition through the optimized gas atmosphere and stepped temperature control, and the method has important application value in the fields of neutron detection, two-dimensional materials and the like.

The application discloses a kind of high coercivity neodymium-iron-boron permanent magnet materials without heavy rare earth and preparation method thereof, and the preparation method comprises the following steps: preparing alloy powder, the main phase of alloy is R2Fe14, and the volume fraction of main phase is not less than 95%, R is light rare earth element, and does not contain heavy rare earth Dy and Tb;Alloy powder is formed into compact in the orientation field with magnetic field intensity not less than 1.8T;The compact is sintered at 1000-1100 DEG C, and then two-stage tempering treatment is carried out, the first stage tempering temperature is 700-900 DEG C, and the second stage tempering temperature is 440-550 DEG C, and high coercivity is obtained under the condition of no heavy rare earth by composition design and sintering tempering process cooperation.