Conical powder feeding device for ultra-high-speed plasma cladding and ultra-high-speed plasma cladding method

A technology of plasma cladding and powder feeding device, which is applied in the coating process and coating of metal materials, which can solve the problems of reduced production efficiency, low powder utilization rate, segregation of cladding layer, etc., so as to alleviate the reduction of mechanical properties and avoid Evaporation and burning loss, and the effect of reducing the amount of subsequent processing
CN111411355AInactive Publication Date: 2020-07-14TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2020-07-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a conical powder feeding device for ultra-high-speed plasma cladding and an ultra-high-speed plasma cladding method. The conical powder feeding device comprises a central cylinder, a water-cooled inner spacer, a powder guide spacer, and a protective air spacer and a water-cooled outer spacer which are assembled to the outside from a central shaft. The entrance of the centralcylinder is axially connected with the anode of a cladding gun of a plasma cladding system; the conical powder feeding device delivers the powder to a plasma jet uniformly at a high speed, under themechanical constraint of the outlet oblique conical surface of the powder guide space, a conical powder fluid with a pre-designed angle is formed, and finally the fluid focuses on the central shaft, so as to obtain the powder jet with high concentration, high speed, uniform distribution and small divergence, and under the ultra-high-speed plasma cladding condition of above 10-200m / min relative movement speed of the plasma cladding system and a workpiece, a cladding layer with thin thickness, uniform chemical composition, low surface roughness, low dilution rate and dense microstructure can beobtained.
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Description

technical field

[0001] The invention relates to the fields of plasma cladding, plasma spraying, remanufacturing and repair, and in particular to a conical powder feeding device for ultra-high-speed plasma cladding and an ultra-high-speed plasma cladding method, by focusing the powder material on the central axis , which is conducive to improving the uniformity and stability of powder heating and acceleration in the process of plasma cladding, plasma spraying, remanufacturing and repairing, and reasonably allocates the energy ratio between heating powder and heating workpiece substrate, so that in ultra-high-speed plasma melting Under the cladding conditions, a cladding layer with thin thickness, uniform chemical composition, low surface roughness, low dilution rate and dense microstructure can be obtained. Background technique

[0002] Plasma cladding technology is a surface treatment technology that uses high-energy-density plasma jets to melt the fed powder or wire onto th...

Claims

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