Method for preparing lead-free piezoelectric coating by using vacuum cold spraying technology

The invention provides a method for preparing a lead-free piezoelectric coating by using a vacuum cold spraying technology, which comprises the following steps: S1) mixing raw materials according to a chemical formula K1-xNaxNbO3, and carrying out high-temperature treatment to obtain lead-free piezoelectric ceramic powder; x ranges from 0.3 to 0.7; s2) carrying out ball milling treatment on the lead-free piezoelectric ceramic powder to obtain treated lead-free piezoelectric ceramic powder; and S3) spraying the treated lead-free piezoelectric ceramic powder on the surface of a substrate through a vacuum cold spraying technology to obtain the lead-free piezoelectric coating. Compared with the prior art, the lead-free piezoelectric coating is prepared through the vacuum cold spraying equipment, the method is high in deposition efficiency and low in cost, deposition is completed at the room temperature, the influence on an original material under the high-temperature condition is avoided, the phase structure and