Hydrogen power metal solid deposition device and method

Abstract

The invention discloses a hydrogen power metal solid deposition device and method, and belongs to the technical field of metal solid deposition. The device comprises a material conveying system, a Laval nozzle and a hydrogen recovery system, the material conveying system comprises a powder feeder and a gas heater, and the powder feeder and the gas heater are both connected with an inlet of a Laval nozzle arranged in the closed spraying chamber. The hydrogen recovery system is connected with the closed spraying chamber and an inlet of the gas heater so that hydrogen can circulate under the closed condition. Sprayed hydrogen in the closed spraying chamber is recycled through the hydrogen recycling system and enters the gas heater to be heated, and then the hydrogen serves as accelerating gas to continue to accelerate micron-sized powder particles to be sprayed, so that the micron-sized powder particle accelerating effect and the collision deposition performance can be remarkably improved efficiently at low cost; and the oxygen content of the additive metal deposition body is reduced, and the mechanical, electrical and magnetic properties of the metal deposition body are greatly improved.

Description

technical field [0001] The present invention relates to the technical field of metal solid state deposition, and in particular, to a hydrogen powered metal solid state deposition device and method. Background technique [0002] As an emerging new surface treatment engineering technology, metal solid-state additive manufacturing is one of the important supplements to traditional thermal spraying technology. It is a spraying technology based on aerodynamic principles. The principle is to use high-pressure gas (nitrogen, helium) , air or mixed gas, etc.) carry metal powder particles into the high-speed airflow, and generate supersonic gas-solid two-phase flow through the scaling tube (Laval tube). The plastic deformation achieves the deposition of micron-sized powder particles. [0003] At present, the industrially available processes that can significantly increase the particle collision speed usually use expensive helium (about 20-80 times that of air and nitrogen) as the ac...

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Problems solved by technology

[0003] At present, the technology available in the industry that can significantly increase the particle collision speed usually uses expensive helium (about 20-80 times that of air and nitrogen) as the accelerating gas; by increasing the temperature of the accelerating gas, the spraying can also be improved to a certain extent Particle deposition rate, but limited effect

At the same time, the temperature of the accelerating gas is too high, which has a certain heating effect on the metal powder. When depositing aluminum, copper, nickel, stainless steel and other materials, it is easy to cause clogging of the spray gun, which seriously affects the process performance of cold spraying.

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