8results about How to "Solve decomposition" patented technology

The invention discloses a silicon nitride crystal based on a physical vapor transport method and a preparation method thereof, and the preparation method comprises the following steps: laying silicon nitride powder as a raw material at the bottom of a graphite crucible, fixing a seed crystal on a top cover of the crucible, placing the device in single crystal growth equipment, vacuumizing, heating to 1000-1300 DEG C, filling nitrogen to 800-1000 mbar, and preserving heat for 1-3 hours, the method comprises the following steps of: heating to the temperature of between 1,600 and 2,000 DEG C, inhibiting the decomposition of silicon nitride, continuously heating to the temperature of between 1,600 and 2,000 DEG C, adjusting the air pressure in equipment to 100 to 300 mbar, and promoting the silicon nitride to be decomposed into silicon steam and nitrogen. And controlling the temperature of a seed crystal area to be 1500-1700 DEG C and the axial temperature gradient to be 10-50 DEG C / cm, so that Si and N substances in a gas phase are crystallized on the surface of the seed crystal to generate a silicon nitride crystal. And after the crystal grows, filling inert gas and slowly cooling to room temperature to finally prepare the complete silicon nitride crystal. The preparation method disclosed by the invention is accurate in process and high in crystal quality, and the prepared silicon nitride crystal has the particle size of more than 500 microns and the purity of more than 5N, and is suitable for the field of application of high-end materials.

The utility model belongs to the technical field of quenching tube furnaces, and particularly relates to an in-situ atmosphere quenching tube furnace and a quenching method thereof. The in-situ atmosphere quenching tube furnace comprises a high-temperature furnace body, a furnace tube penetrates through the high-temperature furnace body, the front end of the furnace tube is connected with a T-shaped tee joint, a sample groove with a long handle is formed in the T-shaped tee joint in the horizontal direction, the T-shaped tee joint is an air inlet end in the vertical direction, a quenching pool connector is vertically formed in the rear portion of the furnace tube, and a quenching pool is arranged in the quenching pool connector. A quenching pool is connected below the quenching pool connector, the rear end of the furnace tube is an air outlet end, and the air outlet end is connected with a hose. Through a full-sealed operation chain and precise time sequence control, full-flow atmosphere protection from high-temperature treatment to ultra-fast cooling of the nano material is realized, grain boundary oxidation and element segregation are effectively inhibited, quenching treatment of materials extremely sensitive to oxygen, water and carbon dioxide is supported, and the service life of the nano material is prolonged. The problem of material decomposition caused by temporary air exposure of traditional open or semi-closed equipment is solved.

This invention provides a dressing containing Ligusticum striatum microspheres and its preparation method, to solve the problem of safe and precise application of Ligusticum striatum extract or Ligustrazine in difficult-to-heal wounds; the dressing containing Ligusticum striatum microspheres and its preparation method, wherein the dressing is composed of Ligusticum striatum microspheres loaded with pHEMA hydrogel as the main body, wherein the Ligusticum striatum microspheres are formed by coating Ligusticum striatum extract or Ligustrazine with PLGA, and the pHEMA hydrogel partially encapsulates the Ligusticum striatum microspheres.

The invention discloses a frozen film concentration device and belongs to the technical field of vacuum concentration. The invention solves the problem that the product quality is easy to decline because the feed liquid needs to be continuously heated in the existing vacuum evaporation and concentration operation process. A refrigerant inlet is formed in the top of the rotor, a refrigerant outlet is formed in the bottom of the rotor, the top of the rotor is connected into the liquid collecting disc and rotates along the central axis of the liquid collecting disc, and a plurality of overflow holes are formed in a first area of the side wall of the liquid collecting disc. A scraping plate is fixedly connected to the side wall, far away from the first area, of the concentrator shell, and the other end of the scraping plate is tightly pressed on the side wall of the rotor. Refrigerant flows in the rotor, so that the surface of the rotor is kept in a low-temperature frozen state, a plurality of frozen film concentrators are connected in series to form a multi-stage continuous concentration process, the whole concentration process is performed in a low-temperature environment, original nutritional ingredients of feed liquid are reserved to the greatest extent, and the quality of concentrated products is greatly improved.

The utility model discloses a decomposer for food detection, which relates to the technical field of food decomposers and comprises a sealing tank, a sealing plate and a locking box, the sealing plate is movably mounted on one side of the top of the sealing tank, the locking box is mounted on one side of the sealing tank, the locking box is locked and meshed with one side of the sealing plate, and the sealing plate is movably mounted on one side of the sealing tank. A stirring assembly is fixedly connected to the bottom of the inner wall of the sealing tank, the interior of the sealing tank is uniformly stirred through transmission, an observation assembly is arranged on the top of a sealing plate, and the interior of the sealing tank is conveniently observed through scraping cleaning. According to the utility model, the observation assembly is arranged to observe the interior of the sealing tank, and then the stirring assembly is used to uniformly stir the interior of the sealing tank, so that the problem that the decomposition device needs to open a tedious secret method structure when stirring decomposed food, and the food cannot be conveniently decomposed is solved; the effects that the food decomposition condition can be observed, and meanwhile uniform stirring can be conducted are achieved.

The invention relates to a perovskite photovoltaic cell and a preparation method thereof, the perovskite photovoltaic cell sequentially comprises a composite substrate, a transparent electrode layer, a hole transport layer, a barrier protection layer, a perovskite light absorption layer, a passivation layer, an electron transport layer and a top electrode layer, the composite substrate comprises an ultraviolet light removal layer and two glass layers, the ultraviolet light removing layer is located between the two glass layers. According to the perovskite photovoltaic cell, the durability and the stability are improved, and the service life of the cell is greatly prolonged.

The invention provides a compound sodium nitrophenolate-thidiazuron microemulsion and a preparation method thereof. The microemulsion comprises an effective component, a high-molecular long-chain EO-PO polymer and an auxiliary material part, wherein the high-molecular long-chain EO-PO polymer comprises a polymer with the molar molecular weight of 5000-30000. According to the invention, a high-molecular polymer is creatively used for coating a thidiazuron active compound in a nanoscale micro-droplet state, so that the problem that thidiazuron is greatly decomposed after the thidiazuron active compound and compound sodium nitrophenolate are compounded to prepare the microemulsion is solved; meanwhile, the high-molecular polymer disclosed by the invention replaces a traditional solvent dissolution form with a form of wrapping a thidiazuron active compound, so that a slow-release effect is achieved, the long-acting property of the whole preparation is improved, the medication frequency and the dosage are less, meanwhile, the high-molecular polymer is safe to crops, the plant vigor is improved, the fruit setting rate can be remarkably increased, and the stress resistance of plants is enhanced.

The invention relates to the field of materials, in particular to a preparation method of a fluorine-doped tin oxide target material. Carrying out compression molding on the powder mixture of the raw materials and sintering; the powder mixture comprises the following components in percentage by weight: 70 to 99.9 percent of SnO2 and 0.1 to 10 percent of metal fluoride; 0 wt.% to 10 wt.% of a metal oxide; 0 wt.% to 10 wt.% of a sintering aid; the melting point of the metal fluoride is greater than 800 DEG C. According to the preparation method of the fluorine-doped tin oxide target material provided by the invention, a high-melting-point (gt; compared with the prior art, the metal fluoride with high temperature (800 DEG C) is used as a fluorine source of the fluorine-doped tin oxide target instead of stannous fluoride, so that the problem of decomposition of the metal fluoride in the high-temperature sintering process of the target is fundamentally solved, the control precision of the components of the target is improved, and the photoelectric property of the fluorine-doped tin oxide film can be effectively improved.