8results about How to "Increase the nucleation rate" patented technology

According to the method for preparing the nanoscale carbonyl iron powder under the conditions of normal pressure and low temperature and the special integrated equipment for implementing the method, efficient cooling and nucleation of iron steam can be achieved by adopting a specially-designed micro-nano bubble generation device, and the nanoscale carbonyl iron powder which is narrow in particle size distribution, uniform in morphology and excellent in magnetic performance is prepared.

This invention provides a QPQ surface strengthening method for flexible and rigid wheels in harmonic reducers, comprising the following steps: after machining the flexible or rigid wheel, it is sequentially degreased, cleaned, dried, and preheated; the preheated flexible or rigid wheel is nitrided to form a nitrided layer on its surface; the surface of the flexible or rigid wheel is treated mechanically or by tumbling; the polished flexible or rigid wheel is placed in molten oxide salt for oxidation treatment to form an oxide layer on the surface of the nitrided layer; after the oxidized flexible or rigid wheel is air-cooled, it is immediately rinsed with clean water and dried with hot air, and then coated with anti-rust oil. Compared with the prior art, this invention uses low-temperature salt bath nitriding and oxidation treatment, the QPQ process is short, has fewer process steps and is easy to control, and the salt bath can be recycled. The surface hardness of the workpiece reaches 800-850 HV, and the wear rate is reduced by more than 70% compared with the traditional tempering process, significantly extending the service life of the workpiece.

The invention discloses iron phosphate as well as a preparation method and application thereof. The preparation method of the iron phosphate comprises the following steps: mixing a ferrous dihydrogen phosphate solution, an oxidation solution and oxygen in a gas-liquid mixer, enabling the mixture to flow into a reaction container, heating and stirring, carrying out solid-liquid separation, drying to obtain iron phosphate dihydrate, and roasting, the feeding flow of the ferrous dihydrogen phosphate solution is 0.0030 mol / min to 0.1800 mol / min; the feeding concentration of the oxidation liquid is 3%-35%; the feeding volume flow rate of the oxidation liquid is 0.08 to 32 mL / min; and the inlet pressure of the oxygen is 0.05 to 3 Mpa. According to the method, the ferrous dihydrogen phosphate solution is jointly oxidized by the oxygen and the oxidation liquid, so that the use amount of the oxidation liquid is reduced to reduce the cost, the gas-liquid mixer is adopted to realize continuous preparation of the iron phosphate and ensure the synthesis uniformity, the obtained iron phosphate is high in quality, and the lithium iron phosphate positive electrode material subjected to subsequent processing shows excellent capacity and rate capability.

The utility model discloses a water heater and an inner container of the water heater. The inner container of the water heater comprises a container body, the liner body is filled with a phase change medium dispersed with nucleating agent particles, and the particle size of the nucleating agent particles is a predetermined size; the water heater inner container further comprises a heat exchange assembly. The heat exchange assembly comprises a plurality of fins and heat exchange tubes, the plurality of fins are fixed in the liner body at preset intervals, mounting holes are formed in the fins, and the heat exchange tubes are arranged in the fins in a penetrating manner through the mounting holes; the preset distance between the multiple fins is 1.5 times to 5 times of the preset size. According to the water heater and the inner container thereof, the preset distance between every two adjacent fins in the inner container is improved, the heat exchange efficiency of the water heater can be improved, and therefore the hot water supply capacity of the water heater is improved.

The application provides a method for in-situ combustion synthesis of high-purity nanometer silicon carbide powder, and belongs to the technical field of inorganic nanometer material preparation, and comprises the following steps: placing water-soluble saccharide substances, gel monomers, water-soluble solutions of a crosslinking agent and an initiator into ion exchange columns respectively for filtration purification, then mixing the water-soluble saccharide substances, the gel material and high-purity silicon powder to form a sol, further carrying out in-situ gel solidification and pre-carbonization treatment to obtain a Si / C composite material block; carrying out combustion synthesis reaction on the obtained Si / C composite material, grinding the obtained block-shaped product to obtain the high-purity nanometer silicon carbide powder. The high-purity carbon source and the silicon source are fixed by the gel network, the silicon powder is uniformly embedded in the carbon skeleton, uniform dispersion and close combination of the two are realized, and the in-situ combustion synthesis reaction is efficiently promoted. The raw material cost in the application is low, the preparation process is simple, the environment is friendly, and the application is suitable for industrialized large-scale production of high-purity nanometer silicon carbide powder.

The lead belt production line for preparing the lead-acid storage battery polar plate comprises a lead melting pot, a heat preservation pot and a lead storage tank which are arranged in sequence, an inner cavity of the lead melting pot is communicated with an inner cavity of the heat preservation pot through a lead conveying pipe, an overflow opening in the heat preservation pot is in butt joint with an inner cavity of the lead storage tank, and cooling pipelines of the cooling system are evenly distributed on the outer wall of the lead storage tank. The method comprises the following steps: adding lead alloy into a lead melting pot for melting, conveying the molten lead into a heat preservation pot through a lead conveying pipe after the molten lead is molten, carrying out heat preservation for a period of time, conveying the molten lead into a lead storage tank, starting a cooling system to cool the molten lead and starting an ultrasonic device to carry out ultrasonic treatment on the molten lead in the lead storage tank when a lead blank is cast. And then carrying out a cast-rolling test on a horizontal type upper and lower double-roller cast-rolling machine. The method mainly solves the problems of developed dendritic crystals, non-uniform grain sizes and rough and irregular grain boundaries in the surface microstructure of the lead belt prepared by the existing cast rolling equipment, and can refine the grains and inhibit segregation of alloy components.

The application belongs to the technical field of aluminum alloy processing, and particularly relates to a high-strength and high-toughness 7-series aluminum alloy plate with equiaxed crystal structure and a short-process preparation method thereof. The application improves the comprehensive performance of the aluminum alloy by combining extrusion, cold rolling and heat treatment, and can effectively solve the problems of grain deformation, anisotropy of the structure and mechanical properties of the 7-series aluminum alloy plate in the production process. The 7-series aluminum alloy plate is prepared from an aluminum alloy ingot, and the aluminum alloy ingot is composed of the following components in percentage by mass: Zn: 4.5-6.8%, Mg: 1.8-3.0%, Cu: 0.30-0.70%, Mn: 0.30-0.70%, Zr: 0.10-0.20%, Yb: 0.10-0.40%, and the rest is Al, wherein the mass fraction ratio of Zn and Mg is Zn / Mg: (2.7-3.1):1. The application adopts a short-process high-efficiency preparation method, eliminates the original fibrous structure, improves the anisotropy of the mechanical properties of the material, and obtains the 7-series aluminum alloy plate with equiaxed crystal structure, a tensile strength greater than 550 MPa, an elongation after fracture greater than 12% and other excellent comprehensive properties.

The invention relates to a method for preparing an alcohol cosolvent carbon-based perovskite solar cell in an all-air environment. The solar cell structurally comprises an FTO conductive substrate, an electron transport layer, a perovskite light absorption layer, an inorganic hole transport layer and a carbon electrode, the preparation process of all the functional layers is completely in an air environment condition, the perovskite active layer is prepared by adopting a two-step spin-coating method, and the organic salt in the second step is dissolved by adopting a mixed solvent of isopropanol and methanol. According to the invention, harsh preparation conditions are abandoned, the process is simple, and the purposes of reducing cost and increasing efficiency can be achieved; after the mixed solvent of methanol and isopropanol is introduced, the perovskite active layer has better film forming quality, upper interface defects are passivated, filling factors, short-circuit current density and efficiency are all improved, and the method has better application prospects in the field of manufacturing of single-junction solar cell devices.