59results about How to "Well-developed grains" patented technology

The invention relates to a fluorescent powder material for light-emitting diode (LED) lighting and a preparation method thereof. A two-stage burning synthesis new technology is adopted for nitride andnitric oxide fluorescent powder for LED, so that two types of high-quality raw material powder, i.e., Si3N4 and AlN are prepared, and the nitride and nitric oxide fluorescent powder is further prepared. According to the fluorescent powder material for LED lighting and the preparation method provided by the invention, the influence rule of formula and process parameters on ingredients, structuresand performance of the prepared raw material powder and the fluorescent powder is systematically researched, and on the basis, through the process optimization, the Si3N4 and AlN raw material powder with low oxygen content and high activity, and the nitride and nitric oxide fluorescent powder with a complete crystal form and excellent light-emitting performance are prepared.

The invention discloses a method for preparing a nano-copper ferrite composite oxygen carrier by a microwave hydrothermal method, belonging to the technical field of chemical chain combustion. The method disclosed by the invention comprises the following steps: dissolving copper nitrate and ferric nitrate in deionized water, then performing ultrasonic treatment, dropwise adding excess ammonia water / urea solution, regulating the PH, performing centrifugal separation, washing a precipitate to be neutral, then placing the precipitate into a reaction kettle, adding a dispersing agent, adding the deionized water till 2 / 3-3 / 4 of the volume of the reaction kettle, placing the reaction kettle in a microwave oven with a water-cooled reflux device for heating, heating at the temperature of 150-220 DEG C for 10-20 hours, then cooling to room temperature and drying to get nano-copper ferrite. The copper ferrite prepared by adopting a hydrothermal synthesis method not only has uniform particle size, complete grain development and no agglomeration, but also is short in reaction time and low in reaction temperature. The copper ferrite prepared by applying the method disclosed by the invention has great application prospects in chemical chain combustion.

The invention provides a method for preparing flaky alumina powder, belonging to the technical field of powder particle size and shape control. The technical process comprises the following steps: by using industrial aluminum hydroxide or transitional-phase alumina powder as a raw material, adding a crystal seed and a crystal grain shape control agent into the raw material powder, uniformly mixing the raw material powder, and pressing into a billet; and carrying out high-temperature calcination on the billet in an atmosphere containing hydrogen halide and shape control component, crushing the calcination billet into powder, carrying out secondary forming, and carrying out low-temperature calcination in an atmosphere containing higher-concentration hydrogen halide, thereby obtaining the flaky alumina powder, of which the thickness is less than 0.2 mu m, the average radius-thickness ratio is greater than 50 and the alpha-Al2O3 content is 100%. The method has the advantages of simple preparation technique and low manufacturing cost.

A 3D printed powder material, the powder includes a mixture of sintered WC-Co cemented carbide spherical particles and tungsten carbide particles as a wear-resistant phase, and a Co-based alloy as a bonding phase; the weight percentage of the wear-resistant phase It is 20%-60%, the weight percentage of binder phase is 40%-80%; the weight percentage of sintered WC-Co cemented carbide spherical particles is 5%-15%, coarse grain or single crystal tungsten carbide The weight percentage of the particles is 15-45%; it can effectively avoid or delay the failure period, and improve the wear resistance and work efficiency of the material.

The invention particularly relates to an electric smelting magenisum aluminum spinel brick for a coal water slurry gasifying furnace and a preparation method of the electric smelting magenisum aluminum spinel brick. The technical scheme is as follows: the preparation method comprises the following steps of: taking 58-74 wt% of industrial aluminum oxide powder and 26-42 wt% of light roasting magenisum oxide powder as raw materials; additionally adding carbon powder which is 0.5-3.0 wt% of the raw materials; uniformly agitating; putting the mixture into an electric arc furnace and electrically smelting by utilizing a 100-220 V voltage until all the raw materials are fused; continually smelting for 30-60 minutes and casting a smelted high-temperature synthetic material into a casting mould; then, placing the material into a tunnel kiln to be annealed by a belt mould under the condition of 1350-1550 DEG C, wherein the annealing period is 72-120 hours; discharging the material out of the kiln under the condition of 30-80 DEG C and de-molding; and finally, carrying out mechanical machining on a de-molded product to obtain the electric smelting magenisum aluminum spinel brick. The electric smelting magenisum aluminum spinel brick prepared by the invention has the characteristics of low apparent porosity, strong anti-stripping capability and good anti-coal-slag penetrating performance, and can better adapt to a working environment of a hot surface of a liner of the coal water slurry gasifying furnace.

A method for preparing CuAlO2 thin film by microwave hydrothermal method. First, copper acetate monohydrate is added to ethylene glycol to obtain solution A; then aluminum nitrate nonahydrate is added to solution A and the pH value is adjusted to 2.0-4.0 to form a uniform precursor material solution B; pour the B solution into the hydrothermal reactor, and immerse the silicon substrate in the B solution; seal the hydrothermal reactor, and put it into the MDS-8 type temperature-pressure dual-controlled microwave hydrothermal reactor; Select temperature control mode or pressure control mode for reaction and then naturally cool to room temperature; open the hydrothermal reactor, take out the silicon base, then wash several times with deionized water, absolute ethanol or isopropanol, and dry to obtain CuAlO2 film . The invention adopts microwave hydrothermal method to prepare CuAlO2 thin film. Not only the preparation cost is low, the operation is simple, and the reaction period is short, but also the product has high purity, complete grain development, uniform particle size distribution, controllable shape and no calcination treatment. The CuAlO2 thin film prepared according to the preparation method of the present invention is uniform and dense, and has strong bonding force.

The invention discloses a synthesis method of lithium manganate cathode material, which comprises the following steps: (1) preparation of lithium manganate precursor; (2) mixed nickel source; (3) pre-sintering; (4) high-temperature sintering; (5) ) aluminum clad. The lithium manganate cathode material synthesized by the invention can improve the theoretical capacity and cycle performance of the lithium battery.