1538 results about "Sphericity" patented technology

A refraction measuring instrument for measuring the refraction of an eye to be examined while the subject is viewing an external object in a more natural posture. A measuring light beam from a light source 21 is reflected from a mirror 25, shaped into a beam with a ring cross section, directed to a free curved surface prism 31 along an optical axis O2, reflected from a surface 31b and a beam splitting surface 31a, guided to an eye E along an optical axis O1 together with the visible light from outside the instrument, and form a ring pattern on the fundus F. The measurement beam reflected from the fundus F is received by a CCD 23 through the free curved surface prism 31 and a prism 22, and a ring pattern is imaged. A calculation control device 4 analyzes the imaged ring pattern and calculates the sphericity, the degree of astigmatism, and the astigmatic axis angle. For measurement, the subject A wears the refraction measuring instrument 1 on the head H through a wearing section 1a.

A solder ball having a diameter of 1.2 mm or less, a dispersion of a diameter distribution of 5% or less and sphericity of 0.95 or more, an area ratio of the maximum dendrite being 80% or less of a cross section including a center of the solder ball, comprises a first additional element of 0.5-8 mass% of Ag and/or 0.1-3 mass % of Cu, and 0.006-10 mass %, in total, of at least one second additional element selected from the group consisting of Bi, Ge, Ni, P, Mn, Au, Pd, Pt, S, In and Sb, the balance being substantially Sn. The solder ball is produced by a uniform droplet-spraying method comprising the steps of vibrating a melt of a solder alloy in a crucible under pressure to force the melt to drop through orifices of the crucible; permitting the melt dropping through the orifices to become spherical droplets in a non-oxidizing gas atmosphere; and rapidly solidifying them.

A spherical particle of the present invention contains a sugar alcohol and a crystalline cellulose and/or powdered cellulose, wherein the mass ratio between the sugar alcohol and the crystalline cellulose and/or powdered cellulose is within a range from 50:50 to 90:10, the particle size is within a range from 75 to 250 μm, the sphericity is not less than 0.8, and the bulk density is not less than 0.6 g/ml. Further, a method for producing the spherical particle of the present invention includes a granulation step of rolling a sugar alcohol having an average particle size of not more than 40 μm and a crystalline cellulose and/or powdered cellulose having an average particle size of not more than 50 μm while spraying a liquid thereon.

The invention discloses a method for preparing a spherical powder material used for three-dimensional printing. The method includes the steps of raw material selecting, high-energy ball milling and radio-frequency plasma spherizing. Selected raw materials are metal or alloy powder in the step of raw material selecting; the step of high-energy ball milling is carried out under the argon shielding condition, petroleum ether serves as the ball milling medium, and the metal or alloy powder is aluminum alloy powder, or titanium alloy powder, or nickel-base alloy powder, or stainless steel powder or tungsten alloy powder; according to the step of radio-frequency plasma spherizing, the total gas flow is 100 L/min-200 L/min, the input power of plasma is 50 kW-100 kW, the negative pressure of a gas outlet of a system is minus 1000 Pa-minus 2000 Pa, and the powder conveying amount is 50 g/min-150 g/min. The manufactured spherical powder is high in sphericity degree, even in granularity, low in oxygen content and good in liquidity, has few defects and is suitable for three-dimensional printing. The method for preparing the spherical powder material used for three-dimensional printing has the advantage that the process is accurate and controllable.

The invention discloses a preparation method of mesophase carbon microspheres from coal liquefaction residues serving as raw materials, which comprises the following steps of: firstly carrying out solvent extraction on the coal liquefaction residues, then carrying out a series of processing to obtain refined asphalt with different contents of quinoline insoluble substances, and carrying out thermal polycondensation reaction on the refined asphalt in the presence of a chemical auxiliary agent and a nucleating accelerator at the temperature of 380-450 DEG C, the pressure of 0-5 MPa and the stirring rotation speed of 40-500 r/min for 1-20 hours to obtain the mesophase microspheres. According to the invention, the chemical auxiliary agent and the nucleating accelerator can be added during theheat treatment process to improve the yield and narrow the particle size distribution of the mesophase carbon microbeads, and the mesophase carbon microspheres are prepared from the coal liquefactionresidues serving as the raw materials and have the advantages of low cost, simple preparation process, high yield (up to 35%), narrow particle size distribution, good sphericity, etc.

The invention relates to a high-density small-particle-size nickel-cobalt-manganese hydroxide and a preparing method thereof. The nickel-cobalt-manganese hydroxide and the preparing method thereof are characterized in that: the general chemical formula of the nickel-cobalt-manganese hydroxide is NixCoyMnz(OH)2, wherein the sum of the x, the y and the z is 1, the x is not more than 0.8 and not less than 0.3, the y is not more than 0.4 and not less than 0.1, and the z is not more than 0.4 and not less than 0.1. The nickel-cobalt-manganese hydroxide is provided, so that problems of small-particle-size nickel-cobalt-manganese hydroxides prepared by methods at present, namely nonuniform element distribution, poor particle appearance, loose surfaces, difficult particle size control, nonuniformity, low tap density, and the like are overcome. A complexing control crystallization coprecipitation method is adopted. By a special technical process of producing nucleuses, growing, and subjecting particles to continuous frictional collision under a continuously increased solid liquid ratio, an aqueous solution of a nickel-cobalt-manganese soluble salt and an aqueous sodium hydroxide solution are subjected to coprecipitation under complexing of ammonia to obtain the small-particle-size nickel-cobalt-manganese hydroxide having characteristics of uniform element distribution, good degree of sphericity, uniform particle size distribution and high tap density.

The invention provides a short-flow preparation method of micro-sized spherical titanium powder, which belongs to the technical field of powder preparation. The hydrogenation-dehydrogenation technique and the radio frequency plasma body fusion spheroidization technique are integrated, and the titanium hydride powder is selected as raw material; the titanium hydride powder absorbs heat in the high-temperature plasma and quickly decomposes and dehydrogenates, and the titanium hydride power is cracked and crushed in the process of dehydrogenation to produce the micro-sized titanium powder. By using the method, the processes of the dehydrogenation and the spheroidization of the generated titanium powder are finished in one step directly through the plasma processing, and the short-flow preparation of the micro-sized spherical titanium powder is realized. The invention has the advantages that the hydrogenation-dehydrogenation technique and the radio frequency plasma fusion spheroidization technique are combined, so as to shorten the production flow, enhance the production efficiency and reduce the production cost. Simultaneously, the prepared spherical titanium power has fine and even particles, good liquidity, high sphericity and low oxygen content, thereby the requirements of technical industrial production such as the injection figuration, the gel die casting figuration, and the like are satisfied.

A method of forming substantially spherical ceramic beads that includes conveying an aqueous ceramic slurry to a nozzle tip that is immersed in an inert water-immiscible fluid layer. The nozzle tip is spaced a predetermined distance away from a rotating disk that is also immersed in the immiscible fluid layer. The rotating disk creates a shear force that at the nozzle tip that dislodges droplets of the aqueous ceramic slurry from the nozzle tip into the immiscible fluid layer. Once dislodged, the droplets assume a substantially spherical shape and a substantially mono-modal size distribution. The droplets are permitted to pass from the immiscible fluid layer into an aqueous gelling solution wherein the droplets are converted into rigid beads. In a preferred embodiment of the invention, the rigid beads are recovered from the gelling solution, washed, and then sintered to obtain a density of greater than about 98% of theoretical density and a sphericity of greater than about 0.95. The method can be used to fabricate substantially spherical zirconia-containing beads having a diameter within the range of from about 0.1 mm to about 2.0 mm that are useful, for example, as grinding media.

The invention belongs to the technical field of synthesis of lithium ion battery ternary anode material precursors, and particularly relates to a preparation method of a nickel-cobalt-manganese hydroxide. The method comprises the following steps: preparing a small-particle-size nickel-cobalt-manganese hydroxide by a nucleation/crystallization isolation method: introducing a nickel-cobalt-manganese mixed metal solution, sodium hydroxide and ammonia water under the condition of a high pH value at the same time for nucleation, adding a certain amount of additive at the end of nucleation to help a crystal nucleus to be dispersed rapidly, and entering a crystal nucleus growing stage to obtain a spherical particular nickel-cobalt-manganese hydroxide with D50 being equal to 2 to 3 mum, high dispersity and high degree of sphericity; controlling the washing condition, so that the sulfur content of the nickel-cobalt-manganese hydroxide is as low as 1,500ppm. The method has the advantages of easiness and convenience in operation, high flexibility, no need of modifying a reaction kettle, easiness for expanded production and the like.

The invention relates to 316L stainless steel powder for the 3D printing technology and a preparation method thereof. The vacuum melting technology is adopted for the method, an ultrasonic vibration and air flow classification method is used for matching powder of different granularities, and the 316L stainless steel powder suitable for the 3D printing technology of different types of metal is prepared through the vacuum degassing technology. Compared with the prior art, the 316L stainless steel powder has the advantages of being high in sphericity degree, uniform in granularity distribution, low in oxygen content, low in impurity content, capable of meeting performance requirements of different 3D printing technologies for powder material and promoting the development of the metal material increasing manufacturing technology and the like.

The invention belongs to a process for preparing and processing powder material by taking plasma as a heat source, in particular to a process and an apparatus of metal titanium powder material for powder metallurgy, plasma spray, injection forming, gel injection molding and the like. The invention has the advantages that: the adoption of the high temperature spheroidization and rapid condensation special spheroidization technique can improve the sphericity and purity of titanium powder, and both a reactor and the titanium powder spheroidization process are cooled with circulating water, thereby ensuring the sealing performance of equipment, also reducing the use of inert gases, effectively reducing costs, improving the production efficiency and guaranteeing the purity of spherical titanium powder.

The present invention provides a particulate composition wherein an oil component (A) comprising a water-insoluble bioactive substance is poly-dispersed while forming a domain in a matrix comprising of a water-soluble excipient based on a water-soluble polymer, and wherein the sphericity of the particulate composition is not less than 0.9 and a method of producing the same. The particulate composition simultaneously has excellent water solubility, workability, tabletability and heat-resistance. It also provides a food, food with nutrient function claims, food for specified health uses, nutritional supplement, nutritional product, animal drug, drink, feed, pet food, cosmetic, pharmaceutical product, therapeutic drug, prophylactic drug and the like, which contain the particulate composition.

The invention relates to a urea-formaldehyde resin coated epoxy acrylic resin microcapsule for a resin-base self-repair coating and a preparation method thereof. The preparation method is characterized by comprising the following steps: adding capsule core raw materials epoxy acrylic resin and acrylate reactive diluent into a water solution containing an emulsifier and a defoaming agent, dispersing the capsule core with a homogenizer or emulsifying machine to form a stable emulsion; regulating the pH value of the stable emulsion system to 2-3, adding capsule wall raw materials urea, formaldehyde and crosslinking agent, stirring until the capsule is formed, and after the reaction finishes, regulating the pH value of the system to neutral; and repeatedly washing with hot water and acetone, centrifuging, and carrying out vacuum drying to obtain the epoxy acrylic resin microcapsule. The capsule provided by the invention has the advantages of favorable sealability, regular sphericity, controllable grain size and controllable capsule wall thickness, and can be widely used for self-repair of a UV-cured acrylic resin coating or epoxy resin coating at low temperature and room temperature, thereby prolonging the service life of the coating material and widening the application range of the resin-base coating.

To provide a toner that can provide long-term removability and high-definition images with reduced image layer thickness and densely-packed toner particles, a developer capable of forming high-quality images using the toner, a toner container for containing the toner, a process cartridge using the toner, an image forming apparatus using the toner, and an image forming method using the toner. The toner of the present invention is a toner having a substantially spherical shape with irregularities on its surface and containing at least a binder resin and a colorant, wherein a surface factor SF-1 that represents the sphericity of toner particles is 105 to 180, a surface factor SF-2 that represents the degree of surface irregularities of the toner particles is correlated with the volume-average diameter of the toner particles, and the toner particles have an inorganic oxide particle-containing layer within 1 μm from their surfaces.

The invention discloses a powder material for selective laser sintering and a preparation method thereof. The powder material is composed of, by weight, 10-90 parts of resin matrix, 5-90 parts of filler, 0.1-5 parts of coupling agent, 0.1-5 parts of dispersant, 0.1-5 parts of compatibilizer, 0.1-8 parts of flow promoting agent, 0.01-3 parts of antioxidant, 0.05-2 parts of light absorbing agent, 0.01-2 parts of lubricant and 0.05-4 parts of surfactant. The preparation method includes: treating the surface of the filler; blending raw materials; banburying the raw materials; powdering; spherifying powder; performing surface modification on the powder. Compared with the prior art, the powder material and the preparation method have the advantages that the preparation method is simple and supportive of continuous production; the preparation process is energy-saving, environment-friendly and pollution-free; resin in the powder material prepared by the method uniformly coats the surface of the filler, and the powder is high in sphericity and excellent in sintering performance.

An lubricant for electrophotography is applied to a latent image carrier that is supplied with toner having a sphericity of 0.94 or more. The lubricant for electrophotography is added with an inorganic additive having the following relationship:

2Y/1000≦X≦Y/10

where Y is a toner particle size (micrometer), and X is an inorganic additive particle size (micrometer).

The invention provides a method for preparing ultrathin metal powder and belongs to the field of material preparation. The method comprises the steps of smelting, atomization, cooling, solid-liquid separation and the like. In the step of atomization, one or more of water, nitrogen, helium and argon serves/serve as an atomizing medium. According to the method, the metal powder or alloy powder with the grain size smaller than 10 micrometers is basically obtained, the ratio of the metal powder or the alloy powder with the grain size smaller than 10 micrometers is over 50%, the sphericity of the obtained metal powder or the alloy powder is over 90%, the oxygen content is smaller than 100ppm, the gas consumption is small, the cooling efficiency is high, and the requirements for devices are low. The method for preparing the ultrathin metal powder is capable of satisfying the requirements of the metal powder or the alloy powder used for injection forming, thermal spraying, thermal spray welding and 3D printing.

The invention relates to a precipitated iron catalyst for Fischer-Tropsch synthesis reaction, and a preparation method and application thereof. The preparation method comprises the following steps of: (a) feeding ferric salt solution, aid saline solution, the solution of precipitator and a small amount of solution of silicon compounds in a form of concurrent flow into a precipitation reactor; (b)performing coprecipitation reaction on the mixture under certain process conditions in the reactor, and fast cooling, filtering and rinsing pulp obtained after the precipitation reaction is finished;(c) adding a silicon compound binder into a filter cake obtained after the rinsing, adding a nitric acid into the filter cake to adjust pH and performing secondary filtration; (d) performing secondary pulping on the obtained filter cake with de-ionized water or the mixed solution of the de-ionized water and the required aid saline solution; and (e) performing spray-drying molding and baking on the obtained catalyst pulp. The catalyst prepared by the method of the invention has high specific surface area, proper pore volume, high wear strength, high sphericity and smooth surface.

The invention provides a manufacturing method of a wafer level glass microcavity used for packaging an MEMS, which comprises the following steps of: (1) etching a shallow slot on an Si wafer by an Si microfabrication process; (2) placing a right amount of high-temperature gas release agent in the shallow slot; (3) carrying out anodic bonding on the Si wafer and a Pyrex7740 glass wafer in air or vacuum and enabling the shallow slot on the Pyrex7740 glass to form a sealed cavity body; and (4) heating the bonded wafer in the air to the temperature of 810-890 DEG C, keeping the temperature for 3-5min, enabling molten glass corresponding to the sealed cavity body to be in a spherical shape by the high-temperature gas release agent because of positive pressure generated by gas generated by heating, cooling to the normal temperature, annealing and removing a silicon wafer to obtain a wafer level spherical glass microcavity array. The invention adopts the release of the high-temperature gas release agent to provide a gas source, is used for forming the glass microcavity and has the characteristics of low cost, simple method, high forming height and good degree of sphericity.