Plasma spraying device and a method for introducing a liquid precursor into a plasma gas stream

Abstract

The invention relates to a plasma spraying device () for spraying a coating () onto a substrate () by a thermal spray process. Said plasma spraying device () includes a plasma torch () for heating up a plasma gas () in a heating zone (), wherein the plasma torch () includes a nozzle body () for forming a plasma gas stream (), and said plasma torch () has an aperture () running along a central longitudinal axis () through said nozzle body (). The aperture () has an convergent section () with an inlet () for the plasma gas (), a throat section () including a minimum cross-sectional area of the aperture, and a divergent section () with an outlet () for the plasma gas stream (), wherein an introducing duct () is provided for introducing a liquid precursor () into the plasma gas stream (). According to the invention a penetration means () is provided to penetrate the liquid precursor () inside the plasma gas stream (). The invention relates also to a method for introducing a liquid precursor () into a plasma gas stream () as well as to the use of a plasma spraying device () and a method in accordance with the present invention for coating a surface of a substrate ().