238results about How to "Uniform crystallization" patented technology

The present invention provides the laser irradiation apparatus that has a galvanometer mirror and an f-theta lens optical system, can offset the change of the energy due to the transmittance change of the f-theta lens, and can scan a laser beam while the change of the energy on a substrate is suppressed. Further, the laser beam energy that is incident on the lens is controlled in advance by combining the optical system changing the branching ratio of polarization of the laser beam and the optical system having dependence on direction of polarization of the laser beam and changed continuously according to the transmittance of the lens on which the laser beam is incident. The laser energy is controlled to offset the transmittance of the lens, and thereby energy fluctuation of the laser beam irradiation of a substrate can be prevented.

The invention provides for growing semiconductor and other crystals by loading a vessel in its lower portion with a seed crystal, loading a charge thereon in the vessel, heating the charge to a molten state and electromagnetically stirring the melt using magnetic and electric fields to obtain a more uniform composition of melt and slowly reducing the temperature of the melt over the crystal to grow a more uniform crystal from such stirred melt.

A method and apparatus for initializing optical recording media is provided that detects the intensity of a reflective light off of an optical recording media and analyzes the initializing condition based on the detected intensity during an initializing process. The light is radiated on a rotating phase-change optical recording medium. The light may be moved in a radial direction of the optical recording medium. The detected intensity of the reflected light may be used to identify crystallized portions and amorphous portions of the optical media. The initialization process can be adaptively controlled to ensure proper initialization. If desired, re-initialization can be limited to those areas detected to be outside of the predetermined parameters.

The invention provides a tantalum target and a manufacturing method thereof; the manufacturing method comprises the steps: firstly, performing a first forging to a tantalum ingot and obtaining a primary forged blank; performing a second forging and a first thermal treatment to the primary forged blank obtained in the previous step and obtaining a secondary forged blank; performing a third forging and a second thermal treatment to the secondary forged blank obtained in the previous step and obtaining a tertiary forged blank; performing a fourth forging and a third thermal treatment to the tertiary forged blank obtained in the previous step and obtaining a quartus forged blank; and finally, rolling and performing a fourth thermal treatment to the quartus forged blank obtained in the previous step and obtaining the tantalum target; the first forging is a rotary forging; the temperature of the first forging is 800-1400 degrees centigrade. The prepared tantalum target is uniform in texture distribution, small in grain size and capable of satisfying usage requirements in high-level semiconductor film-coating industries.

The invention belongs to the technical field of glass ceramic materials, and concretely relates to a high-strength transparent glass ceramic. The glass ceramic comprises, by mass, 65-73% of SiO2, 3-10% of Al2O3, 1.5-4% of Na2O, 10-14% of Li2O, 1.5-4% of P2O5, 1.5-5% of Zr2O and 0-1% of a clarifier, a ratio of (Al2O3+ZrO2) to P2O5 is equal to or more than 2 and equal to or less than 6; and a ratioof P2O5 to (Na2O + K2O) is more than -0.5 and less than 0.5, and the crystal phase of the high-strength transparent glass ceramic contains Li2Si2O5 or LiAlSi4O10. The glass ceramic of the present invention has a transmittance of at least 88% and the surface Vickers hardness after reinforcement is at least 750 kgf/mm<2>.

The invention relates to an acid cleaning and phosphorizing method of an electromobile frame, belonging to the technical field of metal surface treatment. The method comprises the following steps: (1) degreasing the metal frame; (2) cleaning with water; (3) immersing the metal frame in an acid cleaning solution to carry out acid cleaning; (4) flushing with water; (5) immersing in a surface conditioning tank to carry out surface conditioning; (6) immersing in a phosphorizing tank to carry out phosphorization and film formation; (7) cleaning in a clean water tank; and (8) drying in a phosphorizing line baking oven. The invention has the advantages of low technical difficulty, strong operability, simple technique, low deposit amount, high film formation speed, is simple and convenient for maintenance, greatly lowers the labor intensity of workers, and reduces the technical pollution; and the finally obtained grey phosphorized film has the advantages of uniform crystallization and moderate thickness, and greatly prolongs the service life of the electromobile metal frame.

The invention discloses a manufacture method of a fused cast zirconia-alumina brick. The brick is prepared from 35.69% of zircon sand, 15.3% of zirconia, 47.01% of powdered alumina and 2% of sodium carbonate. The manufacture method comprises the following steps: 1. weighing the raw materials in weight percent and then evenly mixing; 2. adding the mixed raw materials after the furnace temperature rises to 1850 DEG C, and then heating up to melt for 90 minutes; 3. keeping the temperature for 30 minutes after the furnace temperature rises to 2780-2800 DEG C, and then carrying out secondary oxygenblowing; 4. lowering the furnace temperature to 1860-1880 DEG C for casting after the oxygen blowing, and carrying out deep gas discharge and afterteeming of a casting solution in a mouldboard; 5. and annealing. The brick has obvious high temperature resistance and erosion-resistant performance when being used on a glass kiln; compared with the original zircon corundum bricks, the service life ofthe fused cast zirconia-alumina brick is prolonged by two years, thereby bringing considerable economic benefits to users. The fused cast zirconia-alumina brick receives authorization and trust fromexperts and clients of dozens of countries, such as Japan, Britain, France, India and the like.

The invention discloses a chemically strengthenable self-crystallizing glass ceramic and a preparation method thereof. The glass ceramic has crystals with the average crystal size ranging from 5 nm to60 nm, a main crystal phase of the crystals is at least one of a beta quartz solid solution, nepheline and a nepheline solid solution, the crystals account for 30%-90% by mass of the glass ceramic, and the glass ceramic contains 8%-13% of Li2O by mole, the content ratio of Al2O3 to Li2O is greater than or equal to 1.8, the sum of the content of the Li2O and the content of the Na2O is 10% to 15%,and nucleating agents ZrO2, TiO2 and fluoride are not added in the glass ceramic. The glass ceramic has the advantages of high aluminum content, high lithium content and low sodium content in composition, and contains no nucleating agent; the high lithium content increases the crystallization tendency of the glass substrate to realize uniform crystallization; the crystal growth speed can be controlled by the high aluminum content, so that the glass ceramic network structure is firm, and the mechanical strength is improved; the low nano content can reduce the dielectric constant of the glass ceramic.

The invention discloses an electroslag remelting slag for smelting plastic mould steel. The slag comprises the following raw materials by mass percent: 30-45% of CaF2, 20-30% of Al2O3, 20-30% of CaO and 5-10% of SiO2. A preparation method comprises steps of: uniformly mixing the added raw materials; roasting; slugging; and standby applying. The viscosity of the electroslag remelting slag can be increased, the air permeability of the electroslag remelting slag can be lowered, moreover, the environmental pollution can be reduced, and the thermal efficiency and electrical efficiency of electroslag remelting are increased; and the plastic mould steel is remolten by an electric furnace and an electroslag furnace, has the thickness of 100-300 millimeters, has high purity, low sulphur content, less non-metallic inclusions, smooth steel ingot surface, uniform and dense crystallization and uniform metal tissue and chemical ingredients, and can fully satisfy market requirements.

The invention discloses production equipment and a production technology for an HDPE (high density polyethylene) spirally enwound structure-wall pipe (Krah pipe).The equipment comprises a base trolley, cooling fans, a mold roller, rolling wheels, a servo motor, an infrared heating device and a rotating rod. The technology comprises material mixing, feeding, vacuum feeding, extrusion, enwinding, turning, demolding, modification, electric fuse distribution, inspection and storage. According to the production equipment and the production technology, infrared high-frequency heating is adopted, the heating efficiency is high, the cost is low, and the operation is simple and convenient; the ring stiffness is increased by above 30% due to addition of short-glass-fiber master batches; characteristics of HDPE are adopted, so that the comprehensive performance of the pipe is improved; the weld seam quality of the pipe is guaranteed, and the weld seam quality and the overall external pressure resistance of the pipe are also improved.

The invention discloses an alkaline non-cyanide zinc plating nickel alloy plating solution and an electroplating process thereof. The plating solution is prepared with hydantoin or a hydantoin derivative as a main coordination agent by adding an auxiliary coordination agent, zinc sulfate, nickel sulfate, potassium carbonate and water. The plating solution comprises 20 g-400 g/L of the main coordination agent, 5 g-300 g/L of the auxiliary coordination agent, 5 g-200 g/L of the zinc sulfate, 1 g-150 g/L of the nickel sulfate and 5 g-435 g/L of the potassium carbonate. The electroplating process of the plating solution comprises the steps of substrate pretreatment and zinc-nickel alloy electroplating. A constant current electroplating mode is adopted for zinc-nickel alloy electroplating. The electric current density is 0.5 A-5 A/dm2. The temperature of the plating solution is 30 DEG C-60 DEG C. The distance between a cathode and an anode is 0.5 cm-25 cm. The stirring speed of the plating solution is 0 rpm-3000 rpm. The electroplating time is 1 min-120 min. According to the plating solution and the electroplating process thereof, the hydantoin or the hydantoin derivative serves as the main coordination agent for the first time, and zinc-nickel alloy with the nickel content of 10 wt.%-13 wt.% is obtained through electro-deposition by using the main coordination agent and the auxiliary coordination agent in a combination mode. An obtained coating is good in corrosion resistance. The stability of the plating solution is improved immensely compared with using of a single coordination agent.

The invention which discloses a preparation method of cephathiamidine freeze-dried powder injection is characterized in that the cephathiamidine is dissolved in the temperature of 40 to 60 DEG C and after the color removal through activated carbon and filtration, the hot solution is rapidly cooled to minus 41 to minus 30 DEG C in a freeze drier; the temperature is reduced to minus 60 to minus 50 DEG C and the vacuum is pumped and the temperature rises to 20 to 30 DEG C gradually; the obtained cephathiamidine freeze-dried powder injection has the average yield of more than 98 percent, water content of less than 0.4 percent, stable quality of drugs, uniform crystallization and color and plump appearances.

An object of the present invention is to provide a compact laser irradiation device and a laser irradiation method using an optical system including an electric mirror and an fθ lens, which can suppress interference caused by secondary beams on the back side of a substrate Therefore, uniform laser annealing can be performed on the irradiated object, and the throughput can be improved. In the present invention, when it is assumed that the thickness of the substrate on which the object to be irradiated is formed is d, the refractive index is n, and the speed of light in vacuum is defined as c, the pulse width t of the laser beam satisfies the inequality ct<2nd. In the above structure, even if an optical system including an electric mirror and an fθ lens is used, the influence of interference due to the secondary beams on the backside of the substrate can be reduced, so that uniform laser annealing can be performed on the object to be irradiated.

The invention discloses a closed circulating heating thermal phosphorization device and a phosphorization method, relating to the technical field of drilling tool thread phosphorization. The device comprises a fluid heater, a phosphorization pool, a heating controller, a spray head, a circulation pipeline, a rubber check ring and a rubber stopper, wherein the fluid heater and the phosphorization pool are connected through the circulation pipeline; the spray head is fixed above the phosphorization pool; a water outlet of the circulation pipeline is connected with the spray head; a drilling rod is supported by a pipe rack and arranged above the phosphorization pool; the rubber stopper is arranged in a water hole of the drilling rod; the rubber check ring is sleeved on a drilling rod joint, and the inner wall of the rubber check ring is in close contact with the outer wall of the spray head; threads extend into a cavity formed by the spray head and the rubber check ring; and the heating controller is connected with the fluid heater. The invention can control the temperature, the pressure and the flow to carry out semi-soaking type phosphorization on the threads so as to solve the technical problems of difficult temperature constancy and non-uniform medicine liquid spraying in thermal phosphorization.

The invention discloses a modified PEEK (polyetheretherketone) material, which is prepared from the following ingredients in parts by weight: 70 to 80 parts of PEEK, 5 to 20 parts of polytetrafluoroethylene, 3 to 5 parts of Cu, 5 to 10 parts of MoS2 and 8 to 20 parts of carbon fiber. The prepared PEET modified material has better mechanical strength and friction coefficient, and meanwhile, the property homogeneity is better.

The invention discloses a system and a process for preparing low-salt dense soda ash by liquid-phase hydration. The method comprises the following steps of: adding light soda ash with the temperature of more than 93 DEG C, condensate water and saturated solution of sodium carbonate according to a mass ratio of 1:0.22:1.4-1:0.22:2.0 into a hydration tank for hydration, wherein the reaction temperature is controlled to be between 100 and 104 DEG C and the reaction time is 20 to 25 minutes, and crystallizing the soda ash in a form of a monohydrate soda, namely Na2CO3.H2O after the reaction; after separating the monohydrate soda crystal slurry with a hydrocyclone separator, feeding the top liquid into a mother liquor storing barrel and feeding the bottom liquid into a centrifuge; after dehydrating the bottom liquid with the centrifuge to obtain a monohydrate soda filter cake; and drying, cooling and screening the monohydrate soda filter cake to obtain the finished product, namely the low-salt dense soda ash, wherein when the centrifuge is used for dehydrating, water is added to wash off a part of salts. The system can guarantee the constant material level of a material bin so that the feeding of the soda ash is stable. The obtained soda ash product has the advantages of large crystallization granule size, high first-rate product rate and high added value, wherein the product with crystallization granule size of more than 180 mu m is up to over 75 percent; the qualification rate is up to 100 percent; and the first-rate product rate is up to 95 percent.

The invention discloses a tetrapod-shaped zinc oxide whisker reinforced aluminum alloy hub and preparing method thereof. The aluminum alloy hub is made of compositions including, by weight percent, 8% to 14% of tetrapod-shaped zinc oxide whiskers, 12% to 16% of silicon, 1.0% to 1.5% of strontium, 0.12% to 0.18% of tantalum, 2.0% to 2.8% of magnesium, 1.8% to 2.4% of manganese, 0.40% to 0.56% of chromium and the balance aluminum. The preparing method comprises the steps of burdening, smelting, atomizing and obtaining aluminum alloy powder; performing ball mill mixing, performing cold isostatic pressing, demolding, performing sleeving coating treatment, performing warming pressure maintaining treatment and obtaining a blank; heating, rolling, forging, and spinning forming to obtain a hub workblank; and performing heat treatment, machining and surface treatment, and obtaining a hub finished product. After-casting treatment temperature is reasonably controlled, and the alloy is uniform in crystallization, high in strength, resistant in corrosion and impact, good in heat resistance, free of bubbles and good in casing and forging performance.

The invention discloses a low-consumption soft magnet ferrite material which comprises the following raw materials in parts by weight: 100 parts of a main material, 0.8-0.9 part of an auxiliary material and 6-8 parts of aids, wherein the main material comprises the following raw materials in parts by mole: 56-58 parts of Fe2O3, 30-33 parts of MnO, 8-9 parts of ZnO and 3-4 parts of NiO; the auxiliary material comprises the following raw materials in parts by weight: 2.5-3.5 parts of CaO, 0.8-1.2 parts of V2O5, 0.9-1.1 parts of SnO2, 0.25-0.35 part of TiO2, 0.5-1 part of Co2O3, 0.15-0.25 part of Nb2O5, 0.9-1.1 parts of MoO3, 0.2-0.4 part of Bi2O3 and 0.3-0.5 part of Ta2O5. The low-consumption soft magnet ferrite material has properties of high frequency, high initial magnetic conductivity and low consumption.

The invention discloses a crystallization method of ammonium paratungstate and relates to a production method of ammonium tungstate by adopting hydrometallurgy. The method is characterized in that the invention has a crystallization process that ammonium paratungstate crystal seeds are added into ammonium tungstate solution when the solution is evaporated and concentrated to appear microcrystalline particles for isothermal crystallization under the solution temperature of 90-95 DEG C for 20-40mins; the solution is then heated up to boil and added with weak aqua ammonia to adjust the pH value of the ammonium tungstate solution to 8.0-8.5 and then treated with feeding and filtering when the density of mother liquor reaches 10.8 to 1.10 g/cm <3>; the solution is again washed with the weak aqua ammonia and deionized water and dried to obtain the ammonium paratungstate crystals with large particle size and uniform distribution. The method of the invention effectively controls the crystallization of the ammonium paratungstate through the measures of removing fine crystals through the weak aqua ammonia, adding the crystal seeds, controlling the evaporation speed, etc.; in addition, the produced ammonium paratungstate crystals with large and controllable particle size are uniform and smooth; and the technology is simple and easy to be operated.

The invention relates to the technical field of nonferrous metallurgy, in particular to a super-thick aluminum alloy cast-rolled plate production method for producing aluminum alloy cast-rolled plates through a horizontal cast-rolling machine. The super-thick aluminum alloy cast-rolled plate production method includes the steps of furnace charging, batching, melting through temperature rise, stir for slagging-off, sampling, furnace discharging, refinement through a holding furnace, slagging-off, online refinement, online degassing, filtration, cast rolling and reeling-up. The super-thick aluminum alloy cast-rolled plate production method has the advantages that distribution uniformity of a cast lip is improved, and temperature distribution is uniform; Al-5Ti-1B grain refinement filament adding technological parameters are reasonably determined; all rolling technological parameters are reasonably determined; fourth, qualified 11.5 mm thick and 1550 mm wide plates are successfully cast-rolled; the optimal ratio of cold material to liquid material for batching is reasonably determined; sixth, quality defects causing instable and unqualified thick plates are overcome; seventh, the limit of rolling thickness of the original design of a cast-rolling device is broken through.

The invention discloses a manufacturing method of a ultrathin high-purity rhenium foil. The manufacturing method comprises the following steps: 1) raw material preparation: firstly, high-purity rhenium powder performs the radio-frequency plasma spheroidizing treatment to obtain high-purity spherical rhenium powder or similarly spherical rhenium powder easy to mold by rolling; 2) pure rhenium pressing blank preparation: adhesive is added in the high-purity rhenium powder after the spheroidizing treatment; and a pure rhenium pressing blank is rolled by using a powder rolling mill; 3) sintering: the pure rhenium pressing blank is sintered at high temperature by a vacuum furnace or other forms to prepare a crystal-uniform pure rhenium plate blank; and 4) continuous rolling and annealing: the pure rhenium plate blank adopts multi-roller rolling mill and annealing linked continuous rolling; and a lubricating agent is coated on the surface of the pure rhenium plate blank for continuous rolling and annealing to obtain a finished rhenium foil with a needed size. The manufacturing method has such advantages as short rolling flow, high annealing efficiency and good surface quality.