Atomizer for directly preparing superfine agglomerated spherical powder and powder preparation device

Abstract

The invention relates to the technical field of powder preparation, in particular to an atomizer for directly preparing superfine agglomerated spherical powder and a powder preparation device. The atomizer comprises a feeding pipe, an air inlet pipe and an air-material mixing cavity; the feeding pipe is detachably inserted into the gas-material mixing cavity in a penetrating mode, a nozzle is formed in the gas-material mixing cavity, the discharging end of the feeding pipe is opposite to the nozzle, a first annular boss is arranged in the gas-material mixing cavity, a second annular boss is arranged on the outer wall of the feeding pipe, and the first annular boss and the second annular boss are in sealing fit through a gasket; an air flow channel is formed between the air-material mixing cavity and the feeding pipe and surrounds the periphery of the air inlet pipe; the air inlet pipe is communicated with the airflow channel, and the air outlet end of the air inlet pipe is opposite to the side wall of the feeding pipe. According to the atomizer for directly preparing the superfine agglomerated spherical powder and the powder preparation device, the particle size range of the powder is not prone to large fluctuation, fluctuation of fluidization factors of the powder is small, and then the stability of coating deposition is improved.

Description

technical field [0001] The invention relates to the technical field of powder preparation for thermal barrier coatings for plasma physical vapor deposition, in particular to an atomizer and a powder preparation device for directly preparing ultra-fine agglomerated spherical powder. Background technique [0002] Thermal Barrier Coating (TBC) is widely used on the surface of hot end components of gas turbine engines. It is one of the three key manufacturing technologies for high-pressure turbine blades of gas turbine engines. Protection technology, which has good heat insulation, high temperature oxidation resistance and corrosion resistance, will significantly improve the service temperature and service life of hot end components. At present, the thermal barrier coating preparation technologies that have been applied in batches mainly include atmospheric plasma spraying (APS) and electron-beam physical vapor deposition (EB-PVD). The atmospheric plasma spraying raw material is...

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Problems solved by technology

Conventional agglomeration and granulation methods, such as high-speed centrifugal spray drying technology, are difficult to achieve the preparation of powders in this fine and narrow particle size range, and it is necessary to find a suitable method

[0004] The conventional gas-flow convection multi-fluid atomization method can only obtain agglomerates within a certain particle size range simply through the atomizer type. To accurately control the particle size range of the powder, it is still necessary to optimize the design of the atomization tower structure of the powder preparation device , creatively solve the problem of stable acquisition, and avoid large fluctuations in the particle size range of batch powders, which will affect the stability of deposition

At present, no relevant research and engineering technicians have tried this field. How to further realize the controllable preparation of special powders is the focus of researchers in this technical field.

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