13 results about "Acicular" patented technology

The polyamide composition is prepared from the following components in parts by weight: 70 parts of polyamide resin, 20 to 40 parts of needle-like wollastonite and mica powder and 0.5 to 3 parts of silane coupling agent, wherein the weight ratio of the needle-like wollastonite to the mica powder is (0.4-2.2): 1, the particle size of the needle-like wollastonite is 570-1600 meshes, and the particle size of the mica powder is 180-850 meshes. The needle-shaped wollastonite and the mica powder are compounded, so that the binding force at a welding part during injection molding can be effectively improved, the strength of a welding mark is further improved, and meanwhile, warping can be improved.

The invention relates to a preparation method of polyhedral molybdenum powder, belongs to the technical field of rare metal powder metallurgy, and solves the problems that in the prior art, molybdenum powder is easy to sinter to cause agglomeration and the morphology is not easy to control. Comprising the following steps: (1) mixing a peroxymolybdic acid solution with metal cations, and performing evaporative crystallization to obtain metal cation-doped peroxymolybdic acid powder with a needle-like crystal structure; in the mixture of the peroxymolybdic acid solution and the metal cations, the mass concentration of the metal cations is 0.05-0.1%; and (2) the acicular crystal structure peroxymolybdic acid powder doped with the metal cations is put into a material boat of a reduction furnace, primary reduction and secondary reduction are sequentially carried out, and the polyhedral molybdenum powder is obtained. The morphology of the molybdenum powder prepared by the method is easy to control.

The invention discloses a method for crystallizing alpha-cyclodextrin, and belongs to the technical field of cyclodextrin production. The invention discloses an alpha-CD crystallization method, which controls crystal growth by regulating and controlling a crystallization kinetic process, shortens a crystallization period, can obtain higher alpha-CD crystallization yield in a shorter crystallization time, does not need to add an organic solvent, and is simple in preparation process, easy to operate, short in crystallization period and suitable for industrial production. Meanwhile, the defect that alpha-cyclodextrin generates fine crystals under the condition of high supersaturation degree is overcome, the particle size of the crystals is greatly increased, the product quality and the crystallization yield are further improved, subsequent centrifugal separation is facilitated, and the method is suitable for large-scale production. The obtained alpha-cyclodextrin crystal is higher in purity, more uniform in particle, good in fluidity, stable in quality, needle-shaped, smooth and flat in crystal face, high in bulk density, small in angle of repose, simple in process and convenient for industrial production.

The application discloses an aragonite whisker preparation method and system based on image recognition and multi-model prediction, and comprises the following steps: in each sampling period, a microscopic image of reaction slurry is subjected to mask extraction, skeleton thinning, cross point breaking and ellipse fitting processing, an average observation vector of crystal size is decoupled and output, a 2D-PBM is input with estimated liquid phase ion concentration, a two-dimensional growth kinetics model is combined, and a posterior state vector at the current moment is obtained; an ESN proxy model is used to replace the 2D-PBM, and the crystal morphology evolution trajectory in the future time domain is deduced within the current sampling period; air inlet component fluctuation is fed forwardly compensated, and adjustment instructions for temperature and air inlet flow are output and executed. The application realizes direct and real-time closed-loop control on the aspect ratio of acicular crystals, suppresses morphology degradation caused by impurity fluctuation, and improves product quality and aragonite phase purity.

Disclosed in the present application are a precursor with a core-shell structure, and a preparation method therefor and the use thereof. The precursor with a core-shell structure comprises a porous nickel-rich core and a manganese-rich or aluminum-containing shell that coats the surface of the core, wherein primary crystal grains forming the core are of a thin needle shape, and primary crystal grains forming the shell are of a thick block shape. By means of the method of the present application, during a coprecipitation reaction process, an internal loose and porous structure is manufactured by means of micro-oxidation, and a core-shell structure is formed; and a positive electrode material prepared from the precursor has improved rate capability, cycling performance and safety performance. By means of the method of the present application, a precursor having an internal porous structure can be formed without needing to add an extra pore-forming agent or a specific organic additive, thereby effectively avoiding the problem of reduced product performance due to impurity residues or increased cost due to subsequent impurity removal; and the preparation method is simple, and is easily applied to mass production.

The application belongs to the technical field of energy materials, and provides a low-temperature response organic molecular crystal, a preparation method thereof and application thereof as an energy material. 18 H 14 N2O)and compound 2 (C 18 H 12 N2O2)two kinds of cold braking flexible crystals, green (compound 1) and white (compound 2) needle-shaped crystals can be prepared by a liquid phase diffusion method, the fluorescence quantum efficiencies of the two are 0.62 and 0.67 respectively under 365nm ultraviolet light excitation, and the crystals can realize optical signal transmission as optical waveguide devices in straight state and curved state, and the optical loss is low. The crystal will have an instantaneous explosive transition at-120℃, with impact energy release, which can affect the surrounding environment, and the luminescent performance remains unchanged before and after the explosion, and the crystal can be used as an energy material at low temperature. The finding provides a new idea for the development of low-temperature propellant materials and the exploration of low-temperature energy conversion crystals, and has great application potential in the field related to low temperature.

The invention is applicable to the technical field of energy materials, and provides a low-temperature response type organic molecular crystal, preparation thereof and application of the low-temperature response type organic molecular crystal as an energy material. Two cold braking flexible crystals of a compound 1 (C18H14N2O) and a compound 2 (C18H12N2O2) are synthesized, green (compound 1) and white (compound 2) needle-shaped crystals can be prepared through a liquid phase diffusion method, the fluorescence quantum efficiencies of the green (compound 1) and white (compound 2) needle-shaped crystals under excitation of 365nm ultraviolet light are 0.62 and 0.67 respectively, the green (compound 1) and white (compound 2) needle-shaped crystals can serve as optical waveguide devices to achieve optical signal transmission in a straight state and a bent state, and optical loss is low. The crystal can be subjected to instantaneous explosive transformation at-120 DEG C, along with impact energy release, the surrounding environment can be influenced, the luminescence property is kept unchanged before and after explosion, and the crystal can be used as an energy material at low temperature. The discovery provides a new thought for low-temperature promotion material development and low-temperature energy conversion crystal exploration, and has great application potential in low-temperature related fields.

This invention relates to the field of ceramic manufacturing technology and discloses a highly efficient three-dimensional underglaze ceramic manufacturing process, comprising: applying a base glaze layer containing calcium oxide to the surface of the body; applying a painting material containing bimodal magnesium oxide to the surface of the base glaze layer to construct a three-dimensional texture layer; utilizing the initial eutectic liquid phase generated at the interface during the firing heating stage as an ion diffusion channel to drive calcium ions and magnesium ions to undergo bidirectional cross-interface penetration, forming a diopside crystal phase supersaturation zone at the contact interface; and constructing a structural support framework by in-situ precipitation of needle-like crystals. This invention utilizes the mechanical constraint of the crystal framework to limit the displacement of the glaze layer in the molten state, fix the three-dimensional shape, and, together with the porous framework network generated by in-situ crystallization at the interface, alleviates the thermal expansion mismatch stress and eliminates the risk of cracking at the root of the three-dimensional texture.

This invention discloses a method for preparing spherical glutathione crystals, comprising the following steps: (1) raw material dissolution; (2) equipment and solvent pretreatment; (3) crystallization: nucleus induction stage, crystal growth stage, and crystallization termination determination; (4) solid-liquid separation and washing; and (5) vacuum drying. This invention achieves efficient preparation of spherical glutathione crystals through the synergistic effect of specific alcohol-liquid ratios, constant-temperature staged stirring, standardized dissolution, and drying processes. The resulting spherical crystals have regular morphology, fundamentally solving the problem of easy aggregation of traditional needle / plate crystals and significantly reducing the difficulty of separation and purification. Simultaneously, the process parameters of this invention are precisely quantified, highly controllable, easy to operate, and compatible with industrial automation equipment, enabling industrial-scale production and improving the processability and application value of glutathione products.

This invention discloses a low-cost, highly crystalline needle-shaped black phosphorus and its preparation method, belonging to the field of black phosphorus preparation technology. This invention uses inexpensive red phosphorus as raw material, and tin iodide, tin, and silver-containing substances as mineralizing agents. The above materials are mixed in a certain mass ratio and loaded into a quartz ampoule with an inner diameter of 15 mm. The vacuum degree of the ampoule is then evacuated to 10... ‑3 After sealing the tube, the sample is placed in a constant-temperature muffle furnace. The furnace is heated to 550℃~750℃ at a heating rate of 5℃ / min and held for 1-2 hours. Then, it is cooled to 500℃~650℃ within 1 hour and held at that temperature for more than 6 hours. Subsequently, it is cooled to 250℃ within 1 hour and then cooled to room temperature with the furnace to obtain highly crystalline needle-shaped black phosphorus. This invention uses a simple and easy-to-operate chemical vapor phase transport method to prepare highly crystalline needle-shaped black phosphorus at relatively low temperature and pressure.

The application discloses a baloxavir ester crystal form B1 and a preparation method thereof. Using Cu-Kα radiation, the X-ray powder diffraction pattern expressed by a 2θ angle has characteristic peaks at positions of 8.24°±0.2°, 9.80°±0.2°, 11.24°±0.2°, 11.76°±0.2°, 13.50°±0.2°, 14.80°±0.2°, 18.08°±0.2°, 19.44°±0.2°, 20.60°±0.2°, 21.18°±0.2°, 21.46°±0.2°, 22.58°±0.2°, 24.38°±0.2°, 25.28°±0.2°, 27.18°±0.2° and 33.42°±0.2°. The crystal habit is blocky, the filtration resistance is smaller than that of Form I with a fine needle-like crystal habit, the particle sample after grinding has a smaller angle of repose, has better particle flowability, and is more beneficial to subsequent preparation process treatment.

The application discloses a low-deformation preparation method for obtaining fine and uniform equiaxed crystal pure titanium. Before rolling the pure titanium material, the pure titanium material is subjected to solid solution treatment, that is, heated to above the phase transition point temperature, water-cooled after heat preservation for a certain time, so that the titanium material contains alpha prime phase acicular martensite, then cold rolling and recrystallization annealing are performed on the pure titanium plate, and thus the pure titanium plate with uniform grain size and all fine equiaxed crystal structure is obtained. Compared with the traditional pure titanium plate preparation method, the solid solution treatment is added before rolling, then the rolling with low deformation and subsequent annealing are performed, and thus the structure with fine and uniform grain size is obtained.