Application of functional coatings by supersonic thermal plasma flows

Abstract

Development of modern high-speed technologies for thermal spraying proves that deposition of high-quality dense coatings requires velocity of sprayed particles to be 600 m/s and above. Plasma spraying is the most versatile and highly productive deposition method of various functional coatings without any limitations on the melting points of the sprayed materials. Present work describes a DC plasma torch designed for operation in a supersonic mode. The supersonic plasma torch features de Laval nozzle, utilization of air as a plasma-forming gas, and annular injection unit for delivery of the powder to the plasma jet. The comparison of NiCr and NiAl coatings deposited both in subsonic and supersonic modes are presented. Methods for further increasing the sprayed particles’velocity and the requirements for their heating temperature are proposed.

Structure and Strength Properties of Plasma Coating Obtained From Powdered Material of Zirconium Dioxide Clad With Nickel

“…Цель исследования -изучение закономерностей формирования покрытия из порошкового материала на основе диоксида циркония, плакированного никелем. При нанесении покрытия использован метод высокоэнергетического плазменного напыления, отличающийся от других методов газотермического напыления высокими значениями тепловой и кинетической энергий плазменной струи (температура плазменного потока Т = 5000-10000 °С, скорость частиц V ~ 2500 м/с) [7][8][9][10].…”