1212results about How to "Process parameters are easy to control" patented technology

The invention relates to a method for preparing alpha semi-hydrated gypsum from dihydrate gypsum. The method comprises the following steps: adding dihydrate gypsum and a crystal modifier into a mixed acid water solution containing sulfur acid and phosphoric acid to carry out crystal transformation, carrying out solid-liquid separation, returning a part of liquid phase into a crystal transformation tank for crystal transformation, and conveying another part of liquid phase to an acidolysis tank for use, wherein the acidolysis tank is used for preparing phosphoric acid by decomposing phosphorite by virtue of sulfuric acid; adding washing water to wash a solid phase, and introducing the washing water into the liquid phase for use. The washed solid phase can be prepared into alpha semi-hydrated gypsum powder through drying and can be prepared into gypsum products such as gypsum boards, gypsum blocks, gypsum components and the like by directly adding water without drying. According to the method, the alpha semi-hydrated gypsum is prepared in the mixed acid water solution containing sulfur acid and phosphoric acid, procedures including desulfuration, removal of impurity and the like on raw gypsum can be omitted, furthermore, mixed acid can be recycled, and the obtained alpha semi-hydrated gypsum product is high in strength and stable in quality.

The invention discloses a torsion type reciprocating extrusion device and a process method thereof, belonging to the technical field of plastic formation. The device comprises a cavity die, a cavity die cover plate and a cavity die fixing plate, wherein the cavity die fixing plate is fixed on a work table, and the cavity die with a variable section spindle structure is arranged between the cavity die fixing plate and the cavity die cover plate. The process method makes materials generate the compound formation of reciprocating extrusion and torsion shearing so as to prepare ultra-fine grained materials with larger volume and uniform tissue.

A process for preparing the crystal phase controllable TiO2 nanocrystals includes such steps as hydrolyzing the Ti-cotnained compound in the aqueous solution of alcohol to obtain amorphous TiO2 powder, adding inorganic acid, hydrothermal treating, filtering, washing and drying. Its resultant TiO2 nanocrystal has the continuously regulatable ratio of anatase phase to rutile phase.

The invention relates to a laser fast forming detection system and method for powder laying evenness and belongs to the technical field of laser fast forming powder laying detection. The laser fast forming detection system and method for powder laying evenness are provided and can monitor whether powder is laid flatly or not in real time and effectively improve the forming quality. According to the adopted technical scheme, a powder laying device, a powder supplying cylinder, a forming cylinder and a material collecting cylinder are arranged in a forming cavity; a laser device and an image collecting device are arranged on the top of the forming cavity; light supplementing lamps are arranged on the two sides of the forming cavity; and the laser device, the image collecting device and the light supplementing lamps are connected with the control system. The laser fast forming detection system and method for powder laying evenness can be widely applied to powder laying evenness detection for laser fast forming.

The invention relates to a hydrothermal synthesis method for preparing iron phosphate lithium as an anode material of lithium ion battery, which belongs to the technical field of new energy materials. The hydrothermal synthesis method comprises the following steps of: mixing an iron source with phosphate, adding a lithium source, and after uniform agitation, putting the mixture into a high-pressure reaction kettle; then, adding a reducing agent, and maintaining the temperature at 180-200 DEG C for 8-12 h to produce spherical iron phosphate lithium, wherein the mol ratio of the lithium source to the iron source to the phosphate is 3:1:1. The invention provides a simple and one-step method for directly preparing iron phosphate lithium. The technological parameters of the method used for preparation are easily controlled; compared with a process using ferric iron as a raw material, the resource of ferrous iron as the raw material is wider; the prepared iron phosphate lithium powder particles have small mean particle diameter which is about 3-5 mu m, the particles are evenly distributed, the tap density can reach 2.0-2.5 g/cm<3>, the battery performance is high, and the specific capacity for the first charge and discharge cycle is 140-160 mAh/g.

The invention discloses a method of removing arsenic from an acid arsenic-containing solution. The method comprises the following steps: the pH value of the acid arsenic-containing solution is adjusted to be 1.0-5.0, an iron-containing material and an oxidizing agent are added, the temperature of the solution is controlled at 25-90 degrees, after reaction, ferric arsenate sediment and arsenic-removed post liquid are obtained, and the removal of arsenic is realized. When copper contained in the acid arsenic-containing solution is greater than or equal to 0.2g/L, iron powder replacement copper removal treatment is required to be carried out first. The method has the advantages that the method is simple in process, low in cost and high in arsenic removal rate and obtained ferric arsenate sediment is stable; valuable metals can be recycled effectively; and the method has very high practicability and economic value.

The present invention relates to cuprous oxide base antibacterial fibers and a preparation method thereof. The preparation method comprises: (1) adding cuprous oxide powder, a dispersant and a modifier to an aqueous medium, and carrying out grinding, dispersion, modification and drying to obtain modified cuprous oxide powder; (2) uniformly mixing the modified cuprous oxide powder in the step (1) and master batches (such as polyester, nylon and the like) with different varieties according to a mass ratio of 1:1-1:50, and carrying out granulation to obtain antibacterial master batches (such as polyester, nylon and the like) with different varieties; and (3) uniformly mixing the prepared antibacterial master batches and ordinary master batch according to a mass ratio of 1:1-1:50, adding the obtained mixture to high speed spinning equipment, and carrying out melt-spinning and winding to obtain the fiber product. According to the present invention, the method has characteristics of simple process and easy industrial production; and the fibers prepared by the method have characteristics of original fiber characteristic maintaining and broad-spectrum antibacterial property, wherein the antibacterial rate is more than 99%.

The invention relates to a zirconium oxide thermal barrier coating for turbine buckets of a gas turbine and a preparation method thereof. The zirconium oxide thermal barrier coating for the turbine buckets of the gas turbine is characterized in that adhesive layer materials and ceramic layer materials are plated on a metal surface; the adhesive layer materials include the following materials in percentage by weight: 15-30% of Co, 20-30% of Cr, 6-16% of Al, 0.2-1.0% of Y, and the balance of Ni; and the ceramic layer materials are zirconium oxide (ZrO2/(5-8%)Y2O3) with stable yttrium oxide. The prepared zirconium oxide thermal barrier coating has compactness, good combining capacity with a base body and good thermal cycle resisting capacity and high temperature corrosion resisting capacity.

The preparation process of nanometer aggregated zirconia powder for spraying includes: mixing nanometer zirconia powder stabilized with 20-60 nm granularity yttrium oxide and adhesive in the mass ratio of 95:5 to 98:2 and adding pure water of 1-1.3 times the mixture weight to compound slurry; spraying at 110-300 deg.c to form micron level aggregated powder; and final plasma nodulizing or sintering to form compact powder of 40-90 micron granularity and with the nanometer crystal structure maintained. The obtained powder may meet the technological requirement of plasma spraying or flame spraying. The technological process is simple, great in output, safe, reliable, low in cost and suitable for continuous industrial production.

The invention relates to an electroslag remelting technique, in particular to a vacuum/gas shield electroslag remelting continuous directional solidification device and method. The device comprises a power supply, a consumable electrode (1), a water-cooling crystallizer (2) and a gas shield system, wherein the lower part of the water-cooling crystallizer (2) is provided with a water-cooling chassis (7) and a stripping device (13), and a two-circuit control mode is adopted by the consumable electrode (1) to make the stripping speed equivalent with the solidification speed of a cast ingot. The invention has simple operation and low cost, is convenient to control, can be used for producing large-dimension low-segregation directional solidification cast ingots and is suitable for mass production and application.

The invention discloses a preparation method of BiVO4-BiOBr photocatalyst has a visible-light response, wherein the catalyst may be used under visible light, ultraviolet light, or sunlight. The preparation method of BiVO4-BiOBr photocatalyst that is in a multilevel nest-like nanostructure and is formed by nanosheets is: heating for 8 to 24 h under an alcohol-heating temperature of 100 to 200 DEG C with pH of 5 to 10. The catalyst of the invention can decompose water-soluble organic pollutant containing chlorine and sulfur, water-soluble organic pollutant of azo, xanthene, and anthraquinone type, and biological contaminant microcystic toxins generated by harmful algal bloom.

The invention relates to spinning equipment, in particular to a semi-continuous high-speed spinning machine. The semi-continuous high-speed spinning machine comprises a rack, a glue supply device, a strip forming device, a spinning device and a winding device, wherein a spinning roller of the spinning device is horizontally arranged relative to an operating surface of a spinning surface. The operating surface of the spinning surface is a horizontal working surface in a spinning surface area, and the fact that the spinning roller is horizontally arranged relative to the operating surface of the spinning surface refers to that the spinning roller is horizontally installed relative to spinning workers when the spinning workers face towards the winding device. According to the semi-continuous high-speed spinning machine, the spinning roller is horizontally arranged relative to the operating surface of the spinning surface, and two ends of the horizontally arranged spinning roller are fixed, so that the spinning speed can be increased on the basis of the semi-continuous high-speed spinning machine, the spinning roller is ensured to rotate stably without shaking, and the problems of intertwining and breakage of strips caused by shaking of the spinning roller during spinning are solved.

The invention relates to a highly conductive thermal insulating metal matrix printed circuit board comprising a metal base body. A ceramic layer formed through a reaction magnetron sputtering method and a metal conducting layer formed on the ceramic layer are sequentially formed on the metal base body. According to the invention, through the adoption of the reaction magnetron sputtering deposition method, a transition layer and a highly thermal conducting layer are deposited on a metal substrate, and the metal substrate is regarded as a circuit board substrate to form an integrated printed circuit board with a high integration degree. The manufacturing method of the invention facilitates the control of technological parameters, and is simple in procedures. The product quality is stable and reliable. The production efficiency is high, and the preparation cost is low.

The invention discloses a composite coating material applied to semi-metal iron-based brake pads. The composite coating material is formed by nickel-chrome alloy powder, chromium carbide powder, ferrosilicon, ferrovanadium, aluminite powder and graphene being subjected to high temperature melting, water vapor mixing atomization, bonding batter-mixing brushing and laser melting. The raw materials comprise the ingredients of, in percentage by mass, 12-50% of nickel-chromium, 15-28% of chromium carbide, 6-10% of ferrosilicon, 5-8% of ferrovanadium, 20-40% of aluminum and 1-2% of graphene. By means of the composite coating material applied to the semi-metal iron-based brake pads and a preparation method for the composite coating material, a metal alloy powder coating formed on the surface of the semi-metal iron-based brake pads has good physical and mechanical performance and has good friction performance and thermal stability under high temperature conditions, and dust after friction is convenient to treat, furthermore, process parameters are easy to control in the preparation process, and the composite coating material applied to the semi-metal iron-based brake pads and the preparation method for the composite coating material are suitable for popularization and application.

The invention discloses a process for preparing high-purity ultrafine magnesium hydroxide by a sodium hydroxide method; by using a crystal seed decomposition method, purified brine and crystal seed of the magnesium hydroxide are added to a reaction pool to be mixed and temperature is kept at 60-80 DEG C; then solution of the sodium hydroxide is added to the reaction pool to carry out the precipitation reaction, crystallization and aging; after the reaction is finished, slurry of the magnesium hydroxide is filtered and washed; cake after filter is dried and crashed, the crystal product of the magnesium hydroxide is obtained. Compared with the prior art, the process for preparing the high-purity ultrafine magnesium hydroxide accelerates agglomeration and growth of the magnesium hydroxide crystal by adding the crystal seed, solves the problem of the difficulty for filtering and washing the filter cake by using the prior sodium hydroxide method to produce the magnesium hydroxide, and directly utilizes the slurry of the magnesium hydroxide generated by the reaction as the crystal seed to carry out cyclic decomposition. The process flow is simple and the process parameter can be easily controlled. The production process is pro-environment without producing pollutant. At the same time, the purity of the magnesium hydroxide obtained by the process and the recovery rate of the magnesium are very high; furthermore, the purity of the by-product sodium chloride is high. The process for producing the magnesium hydroxide has great development prospect.

The invention relates to a high heat conducting and insulating metal matrix printed circuit board. The circuit board comprises a metal substrate, a metal transition layer, a ceramic layer and a metal conducting layer, wherein the ceramic layer is formed through a CVD method, the metal conducting layer is formed on the ceramic layer in sequence, and the heat conducting coefficient of the ceramic layer is larger than 50W/mK. By depositing the metal transition layer and the ceramic layer with high heat conductivity on the metal substrate, the integrated printed circuit board with high integration level can be formed to serve as a circuit board substrate. In addition, a preparation method and a technological parameter of the high heat conducting and insulating metal matrix printed circuit board are easy to control, and the high heat conducting and insulating metal matrix printed circuit board is simple in step, reliable and stable in production quality, high in production efficiency and low in manufacturing method.

The first purpose of the invention is to provide an infant formula ewe milk powder. The material includes the following component: skim ewe milk powder, whole ewe milk powder, concentrated ewe whey protein powder, milk fat globule membrane protein, docosahexaenoic acid, arachidonic acid, vitamin premix, mineral premix, lyophilized bifidobacterium animalis powder and the like, and moreover, Betal-casein in each of the skim ewe milk powder, the whole ewe milk powder and the concentrated ewe whey protein powder is only A2 Betal-casein. Since the invention adopts the skim ewe milk powder, the whole ewe milk powder and the concentrated ewe whey protein powder, the Betal-casein of which is only the A2 Betal-casein, the protein ingredient of the infant formula ewe milk powder is closer to breast milk; the addition of the milk fat globule membrane protein has a positive effect on the cognitive development of infants and decreasing the incidence of part of diseases. The second purpose of the invention is to provide a production method for the infant formula ewe milk powder, the process is simplified, process parameters are easy to control, the production method is suitable for mass production, and practicability is high.

The invention discloses a preparation method for an inverted LED white-light chip of chip scale package, and the method comprises the following steps: temporarily fixing an UV solidifying adhesive tape (2-1) on the upper surface of a die bonding positioning light cover (1); setting flip chips (3) on the upper surface of the UV solidified adhesive tape (2-1) according to the position of the die bonding positioning light cover (1); employing a fluorescent glue film (4) to cover the flip chips (3); carrying out vacuumizing and heating, and enabling the fluorescent glue film (4) to be solidified and packaged on the flip chips (3); carrying out cutting along gaps among the all packaged flip chips (3); removing the die bonding positioning light cover (1); carrying out UV irradiation and enabling the UV solidified adhesive tape (2-1) to be solidified, and obtaining the inverted LED white-light chip (5) of chip scale package. The method simplifies the technological flow, avoids glue mixing and dispensing in the original technology, improves the production efficiency and yield, and greatly reduces the production cost. The method completely avoids the sinking of phosphor, enables the batch stability of the inverted LED white-light chips (5) to be high, and enabling the color temperature of the inverted LED white-light chips (5) to be consistent.