Device for preparing fine crystal powder based on electrostatic spraying, and using method thereof

Abstract

The invention relates to a device for preparing fine crystal powder based on electrostatic spraying. The technical scheme is that the lower end of a hollow support rod (6) is connected to the upper end of a quartz crucible (12) through a variable diameter seal joint (11); the upper end of the hollow support rod (6) passes through a lifting hole and is connected with a lifting mechanism (1) through a flange (3); 4-8 heating elements (22) are evenly fixed at the inner wall of a heat-resisting protective layer (21); a water-cooling receiving copper plate (15) is arranged at the center near the lower part of a furnace body (8); an induction heating coil (13) is arranged above the water-cooling receiving copper plate (15); an insulated corundum protecting pipe (5) is arranged inside the hollow support rod (6); one end of a conductive electrode (2) is externally connected with the anode of a direct current high-voltage power supply (25) through a lead; and the other end penetrates outside from the insulated corundum protecting pipe (5) and contacts the bottom of the quartz crucible (12). The device has the characteristics that the device is little in investment, high in conductivity, easy to operate and rapid to condense, and can conveniently control the powder shape and the microstructure; and the prepared powder is narrow in particle size distribution, small in crystal particle, and high in purity.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to an electrostatic spray-based fine-grain powder preparation device and a use method thereof. Background technique [0002] The preparation of metal raw material powder is one of the most basic processes in the powder metallurgy production process. The composition, purity, particle size and microstructure of the powder play a decisive role in the performance of the final product, and the physical properties of the powder and its preparation Processes are closely related. By selecting different preparation methods and adjusting relevant process parameters, the phase composition and microstructure of the powder can be effectively controlled. Therefore, in order to obtain powder materials that meet the performance requirements, the preparation technology is very important. [0003] At present, the powder preparation methods related to the field of powder metall...

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Problems solved by technology

Among them, the mechanical pulverization method is easy to introduce media, which will cause pollution to the powder, reduce the purity of the product, and accumulate a large amount of internal stress. The particle size distribution of the powder is wide, and it is difficult to obtain a product of uniform size. The irregular shape of the powder reduces the The quality of the powder, such as "iron-based composite oxide Ca 2 Fe 2 o 5 Preparation method" (CN201110060821.0)

The atomization method also easily pollutes the product when the atomization method is preparing the powder. The powder has low purity and large particle size, and it is difficult to obtain a powder material with submicron or even nanometer size. "(CN201110048676.4) and "Non-ferrous metal powder "high-speed centrifugal atomization method" preparation process and device", (CN200410079654.4)

In addition, the preparation of powder by atomization method (such as gas atomization) must use a large amount of atomization medium, especially the use of high-purity gas increases the production cost of powder

In the existing top-down powder preparation technology, there is no method that can obtain submicron / nano powder materials with uniform size, high powder purity and controllable morphology

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