335results about How to "Crystal fine" patented technology

The invention discloses a calcination process of active lime. The calcination process adopts a preheating-suspension calcination device comprising a multi-stage cyclone preheating system, a decomposing furnace and a multi-stage cyclone cooler. The calcination process is characterized in that limestone powder which is broken and homogenized into blocks is ground into fine powder, the fine powder is placed in a storage tank for homogenization, then preheated by the multi-stage cyclone preheating system and sent to the decomposing furnace for calcination, thereby preparing the active lime, and the active lime is further cooled by the multi-stage cyclone cooler for obtaining the active lime; wherein the main control temperature of the decomposing furnace is 850-950 DEG C; and the calcination time is 3-5 seconds. The calcination process utilizes the preheating-suspension calcination reaction method for calcining the active lime, and fuel can use low-grade fuel-biluminous coal. Compared with the traditional process, the calcination time is short, the effective utilization rate of the lime product is high, the product quality is stable, the energy consumption is low, and a production region has no environmental pollution; meanwhile, the calcined active lime is the fine powder, the use is very convenient, and the range of applications is broader in comparison with the active lime calcined by the traditional process, thereby being conductive to promotion and implementation.

The invention discloses methyl sulfonate tinning electrolyte using cerium salt as an additive. The electrolyte comprises the following components: 30 to 120 g/L of stannous methyl sulfonate, 60 to 180 g/L of methylsulfonic acid, 1 to 10 g/L of cerium sulfate, 0.1 to 2 g/L of antioxidant, 5 to 10 g/L of brightening agent and 5 to 10 g/L of surfactant. The invention also discloses a method for tinning a steel strip or a steel plate by adopting the electrolyte. During plating, the cerium salt in the electrolyte lightens the harm degree of 'hydrogen brittleness', and plays roles of the antioxidant and the brightening agent. On the basis of adaptability to the environment, the electrolyte meets the requirements that the process is simple, the solution is stable, the maintenance is easy and the quality of a coating is high.

The invention relates to chemical-copper plating liquid and a copper plating production process, which are used for copper plating of tubular steel and iron pieces and non-metal pieces, and are characterized in that: the chemical-copper plating liquid consisting of copper sulphate, a retarder, a complexant, a reductant and deionized water is used to pretreat a workpiece and then the workpiece is subjected to chemical-copper plating; an anode is 0.3 percent phosphor-containing copper plate; the area ratio of the anode and the cathode is 2:1; the current intensity in the cathode is 0.5 to 4A/dm<2>; the pH value of the copper plating liquid is 1.0 to 3.0; the temperature of the copper plating liquid is normal temperature; and the carrying capacity is 1 to 4dm<2>/kg; the copper plating time is8 to 10 minutes. The liquid and the process have the advantages of firm bonding between cladding and a substrate, stable process, high impurity resistance, long service life, crystalline simple copper cladding, fine cladding crystallization, low porosity, high anticorrosion performance, simple operation, convenient maintenance, no formaldehyde, no damages to human bodies and environment and environmentally-friendly product.

The invention discloses a neodymium-iron-boron magnet of an aluminum or aluminum alloy composite coating and a preparation method thereof. An aluminum or aluminum alloy film is deposited on the neodymium-iron-boron magnet by adopting multi-arc ion plating technology, and then phosphate treatment is performed. The coating is uniform and dense, and is well combined with a matrix. The neodymium-iron-boron magnet applied with the aluminum composite coating with thickness of 10 to 20 microns tolerates high pressure and high humidity (100 to 130 DEG C, 2 to 2.6atm, and 95 to 100 percent RH) for over 200 hours, and tolerates NaCl salt fog corrosion (3.5 to 5 weight percent of NaCl and 25 to 35 DEG C) for over 500 hours. The coating process has high efficiency and low cost; and the prepared composite coating has good corrosion resistance and adhesion performance, and has no influence on the magnetism of the neodymium-iron-boron matrix (mainly small-size magnet).

A method for preparing shortening/margarine base stock oil commonly used by lard oil base belongs to the technical field of edible oil processing and comprises the steps of using lard oil and parts of hydrogenated oil, extreme hydrogenated oil or high-melting-point palm oil extract as raw materials, adopting immobilized lipase (Lipozyme IM-20, Lipozyme IM-60 and Chirazyme L2) to perform catalysis and enzymic method transesterification, adopting solid fat content (SFC) and melting point change of a system before and after reaction at the temperatures of 20 DEG C and 25 DEG C to investigate influence of the temperatures, enzyme adding amount and time to the transesterification and obtain ideal technical parameters, wherein the reaction temperature is 50-80 DEG C, the Lipozyme IM-20 adding amount is 3%-11% or the Lipozyme IM-60 adding amount is 3%-11% or the Chirazyme L2 adding amount is 5%-11%, and the reaction time is 1-6 hours. The SFC curves, crystal habit, fatty acid, triacylglycerol composition and esterization changes of a mixed system after ester exchange are analyzed, and results show that after the ester exchange, the SFC curves of mixed oil products are smooth, crystallization is fine and smooth, fatty acid composition does not change obviously, triglyceride distribution is even, esterization is enhanced remarkably, the method has good processing characteristics, and prepared shortening/margarine is superior to commercially available shortening in bread baking application. The method for preparing the shortening/margarine base stock oil commonly used by the lard oil base widens the application range of the lard oil and can enable domestic excess lard oil resources to be utilized completely.

The present invention relates to a lithium-ion battery positive electrode material precursor material with high-voltage charge and discharge stability, a composite positive electrode material synthetic method and a composite positive electrode material prepared by the method. The precursor material has the advantages of good sphericity, high density, strong lithium source adaptability, gentle mixing environment, and the like, the synthesized composite material has high tap density, compared with ordinary lithium nickel-cobalt-aluminum material, the composite material sensitivity to ambient moisture and carbon dioxide is reduced, and the composite material has good processing performance and storage performance, and exhibits high specific capacity and high stability characteristics when the composite material is charged and discharged in 2.8-4.4V and 2.8-4.5V voltage windows.

The invention relates to a bath solution preparing method and a low-concentration weakly alkaline cyanide-free copper plating which can ensure that the bonding force exists between a plating layer and a matrix, the plating solution has best stability, better dispersing capacity and deep plating capacity and simple process maintenance. The low-concentration weakly alkaline cyanide-free copper plating comprises a main salt, a conductive salt, a main complexing agent and a secondary complexing agent, wherein the main salt is copper chloride, the conductive salt comprises a mixture of sodium chloride, potassium chloride and ammonium chloride, the main complexing agent is a mixture of tartrate, citrate, nitrilotris(methylene)]tris-phosphonic acid salt, (1-Hydroxyethylidene)bis-phosphonic acid tetrasodium salt and ethylenediamine tetra(methylenephosphonic acid) salt; and the secondary complexing agent is a mixture of ortho-hydroxybenzoic acid, succinimide and derivatives thereof and dimethyl hydantoin. The invention has the advantages of capability of ensuring the bonding force of the plating and the matrix, best stability and better dispersing capacity and deep plating capacity and simple process maintenance.

Belonging to the technical field of preparation and application of electronic ceramics, the invention relates to a preparation method of a perovskite-like varistor ceramic material CaCu3Ti4O12 (CCTO) with a high dielectric constant. With nitrates of Cu and Ca as well as Ti (OC4H9)4 as starting materials, the method of the invention combines a hydrothermal method for preparing nanometer CCTO powder so as to prepare high performance CCTO varistor ceramics, thus realizing the purposes of lowering temperature, and improving varistor as well as dielectric properties.

The invention relates to electroplating of aluminum wheel boss, in particular to non-cyanide zinc-deposited solution and a non-cyanide plating method of the aluminum wheel boss using the non-cyanide zinc-deposited solution. The non-cyanide zinc-deposited solution is mainly prepared from the following components: 350 to 450 mL/L cylinder opening agent, 8 to 12 mL/L regulator, 120 to 130 mL/L extender, and the balance of water. The cylinder opening agent contains quaternionic metallic ions of copper, iron, nickel and zinc. The non-cyanide plating method comprises the steps of preplating treatment, zinc deposition for two times, nickel preplating/high-density non-cyanide copper preplating, acid bright copper plating, polishing, pretreatment and multilayer nickel chromium plating; and the non-cyanide zinc-deposited solution is used in the twice zinc deposition. The electroplating technology adopts the process of substituting cyanide with a multielement composition additive, does not contain the cyanide and a strong complexing agent, is non-toxic and harmless, is simple in wastewater disposal and belongs to the process of cleaner production.

The invention discloses a method for preparing bismuth ferrite powder by a solvothermal method. The method comprises the following steps of: (1) weighing and analyzing pure Fe(NO3)3.9H2O and Bi(NO3)3.5H2O according to a molar ratio of 1:1, dissolving the Fe(NO3)3.9H2O and the Bi(NO3)3.5H2O into a nitric acid solution, and stirring through magnetic force to prepare a uniform mother salt solution; (2) dropping an KOH solution into the mother salt solution, stirring through the magnetic force to obtain a precipitate, and washing and drying the precipitate to obtain a hydrothermal reaction precursor; (3) putting the hydrothermal reaction precursor into a hydrothermal kettle, adding a mixture of absolute ethyl alcohol and water as a solvent, and taking the KOH as a mineralizing agent; (4) sealing the reaction kettle, putting the reaction kettle into an oven with a temperature of 120-130 DEG C, taking out a product in the reaction kettle after reacting, and filtering to obtain a precipitate; and washing and drying the precipitate to obtain the bismuth ferrite powder. The method for preparing the bismuth ferrite powder by the solvothermal method has the advantages of low preparation temperature, energy saving, good bismuth ferrite crystallization and simple process control and apparatus required by synthesis.

When high purity silicon is produced through a gas-phase reaction between silicon tetra-chloride and zinc in a reaction furnace, the produce silicon is obtained as block or molten state. after the reaction in which the silicon is not in contact with air and reaction temperature is maintained at melting point of the silicon or less.

The invention discloses a method for preparing lanthanum-doped bismuth titanate nano powder by a sol-gel hydrothermal method, which comprises the following steps of: dissolving Bi (NO3) 3.5H2O and La (NO3) 3.6H2O into glacial acetic acid solution to obtain solution A; dropwise adding Ti (OC4H9) 4 into organic solvent to obtain solution B; dropwise adding the solution B into the solution A, and preparing even sol by magnetic stirring; putting the sol into a drying oven, and drying to obtain xerogel; grinding to obtain powdered hydrothermal reaction precursor; putting the hydrothermal reaction precursor into a hydrothermal kettle, and adding pure water taken as solvent and NaOH taken as mineralizer into the hydrothermal kettle; sealing the reaction kettle, and putting the reaction kettle into the drying oven at 160-170 DEG C; taking out products after reaction, and filtering to obtain precipitate; and finally, washing and drying the precipitate to obtain the lanthanum-doped bismuth titanate nano powder. The method can be used for preparing the lanthanum-doped bismuth titanate nano powder under the condition of low temperature, so that the energy is saved, and lanthanum-doped bismuth titanate is perfect in crystallization.

The preparation method for cyan-free silver plating lustre-coating agent comprises: adding 0.1-1mol/L heliotropin into saturated 0.1-2mol/L NaHSO3 solution for ultrasonic oscillating; dissolving 0.1-2mol/L triethanolamine and 0.1-1mol/L butynediol into the solution, adding solvent to dilute to 1L. This invention overcomes the defects in prior art withnot sulfur-containing compound, and has well dispersion.

The invention discloses anodic phosphorous copper balls and a preparation method thereof. The method comprises the following steps of: (1) after yellow phosphorus or red phosphorus and oxygen-free copper are melted by adopting a medium-frequency induction furnace, stirring the melt uniformly through a magnetic stirring tank to obtain phosphorous copper solution; (2) producing a phosphorous copper bar with a diameter of 20 to 50 millimeters by using the phosphorous copper solution prepared in the step (1) and an up-draw process, and continuously stamping the phosphorous copper bar to obtain copper balls of different sizes in different dies; and (3) performing polishing, burr removal, cleaning and drying treatment on the copper balls obtained in the step (2) in turn to obtain the anodic phosphorous copper balls. The anodic phosphorous copper balls have the advantages of compact crystal, thin and small crystal grain, high phosphorous copper film generating speed, exquisite and firm phosphorous copper film texture and dropping resistance, and can reduce the cleaning frequency of an anode, effectively improve the utilization rate of the anode and remarkably improve the copper plating effect.

The invention relates to a method for preparing flower indium hydroxide with high specific surface area, which belongs to the technical field of inorganic material preparing process. The method uses In water soluble salt as an indium source, urea as an alkali source and sodium dodecyl sulfate as a surfactant to prepare indium hydroxide powder by a hydro-thermal method, wherein the compositions react at a constant temperature for 12 to 24 hours under a low-temperature hydrothermal condition of between 90 and 105 DEG C; and precipitate is obtained through filtration after the reactant is cooled to room temperature, and is washed, centrifugally precipitated and dried to obtain the flower high specific surface area indium hydroxide assembled by nanometer flakes. The method has the advantages that the method prepares the flower indium hydroxide by the low-temperature hydro-thermal method, not only can make crystal sufficiently grow under unrestricted condition with advantages of high specific surface area, controllable appearance and size of the crystal, perfect crystal and the like, but also can obtain powder body with specific surface area of between 20 and 40 mg; and XRD diffraction indicates that a main crystal phase is In(OH) and grows with preferred orientation along (100) direction, and impurity phase is InOOH with content totally less than 12 percent. The system has excellent application prospect in microelectronics, photoelectricity, sensing devices, catalysts, alkaline cells and other fields.

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 relates to a chemical deposition preparation method of a piezoelectric composite metal electrode. The chemical deposition preparation method particularly aims at a PZT ceramic and polymer coexisting composite material and comprises the following preparation steps: preparing a piezoelectric composite, cleaning, removing oil, wetting, carrying out primary coarsening, reducing, carrying out secondary coarsening, activating a colloid target, peptizing, carrying out chemical plating and passivating. According to the chemical deposition preparation method, a metal coating chemically deposited on the surface of the piezoelectric composite has a bright surface, is fine in crystallization, can uniformly cover the surfaces of ceramics and polymers and has good binding force with the ceramics and polymers. An adopted medium and low temperature technology is capable of ensuring that the piezoelectric composite metal electrode is free of deformation and material separation. The chemical deposition preparation method does not need expensive equipment and is low in cost and suitable for large scale production.

The invention discloses a method for filling a PCB blind hole by electroplating copper, and belongs to the field of circuit board manufacturing. The method is characterized by comprising the following steps of: (i) taking CuSO4.5H2O and dissolving CuSO4.5H2O into deionized water, then, adding 44 mL of concentrated sulfuric acid, starting to sequentially add chloride ions, an inhibitor, an accelerator and a leveling agent after a solution is cooled to the room temperature, and uniformly stirring for later use; (2) transferring a plating solution into an electroplating bath, separately inserting a copper plate and a phosphor copper plate as a cathode and an anode, and performing small-current electrolytic treatment; (3) performing PCB sample pre-treatment; and (4) switching on a power supply, and switching off after controlling current density to perform electroplating. According to the method disclosed by the invention, a layer of thin copper is deposited on a hole wall through a chemical plating method, and hole filling treatment is performed by electroplating copper in an acidic copper sulfate plating solution containing an additive until the whole blind hole or buried hole is filled with a deposited copper layer, so that dispersing power of the plating solution is good, crystals of a coating are fine, and binding force is good.

The invention discloses special grease for refrigeration and prepared by mixing lard oil and palm oil and a preparation method thereof. The preparation method of the special grease for refrigeration includes the steps of heating and melting the lard oil, the palm olein and palm stearin, adding a food-grade emulsifier and water into a totally melt oil phase, carrying out emulsification, then carrying out cooling and kneading, and finally curing to obtain the special grease for refrigeration. The special grease for refrigeration comprises, by weight, 8-12 parts of the lard oil, 10-80 parts of the palm olein, 10-80 parts of the palm stearin and 1-2.5 parts of the food-grade emulsifier. An obtained special grease product for refrigeration is in a beta crystal form, the SFC curve of the product is smooth, crystals are fine, the product has good processing characteristics and certain plasticity, compatibility of the grease is good at low temperature, and the oil separation phenomenon can be prevented from occurring.