Nano metal particle cold spraying technique

Abstract

The invention discloses a nano metal particle cold spraying technique which sequentially comprises the following steps: (1) arranging a metal ring electrode at the end face of a jet pipe outlet end, wherein the internal diameter of the ring electrode is equal to that of the wall of the jet pipe; (2) putting the ring electrode and a metal matrix in a vacuum environment, wherein the distance between the ring electrode and the surface of the metal matrix is 5-50mm; (3) connecting an adjustable direct-current stabilized voltage supply to the metal matrix and the ring electrode, wherein the ring electrode is connected to the positive pole of the power supply, and the metal matrix is connected to the negative pole of the power supply; and (4) inputting gas with certain pressure and nano metal particles into the jet pipe from the jet pipe inlet, so that the positively charged metal particles impact the negatively-charged metal matrix surface to deposit and form a nano coating on the metal matrix surface. The invention integrates advantages of vacuum cold spraying and electric field assisted cold spraying, selects proper technological parameters, and can implement nano metal particle spraying operation under the working conditions of normal temperature and pressure.

Description

technical field [0001] The invention belongs to the field of surface technology, and in particular relates to a nano-scale metal particle cold spraying process for depositing nano-scale metal particles on a metal substrate under normal temperature and pressure. Background technique [0002] Cold spraying technology is a new type of surface coating technology developed in recent years. Due to the characteristics of solid deposition at low temperature, it can significantly reduce or even completely eliminate oxidation, phase change, segregation, residual tensile stress and grain in traditional thermal spraying. Unfavorable effects such as growth, especially suitable for the preparation of temperature-sensitive materials such as amorphous and nanometers, and coatings of oxidation-sensitive materials such as copper and titanium. [0003] In the process of cold spraying, whether the sprayed particles can form an effective deposition on the surface of the substrate depends on the ...

AI Technical Summary

Problems solved by technology

The "vacuum cold spraying process" of the patent publication number CN 1782127A solves the problem of peeling in multi-operation cycle coatings, but the particle size range of the spraying process is mainly concentrated between 5 and 50 μm

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