MULTILAYER THERMAL BARRIERS OBTAINED THROUGH APS- AND HVOF- TECHNIQUES

Abstract

The paper presents in brief the technological parameters used for plasma spray deposition. It is also describe the hanging layer deposition (100% metal) with the HVOF device and the other layers deposition in argon-hydrogen atmosphere using plasma jet generated by a METCO7M device. There are analyzed microscopy images performed on deposits of thermal ceramic barriers at Diesel engine pistons. The paper also presents the analysis of the chemical composition of the multilayer thermal barrier of Me/MeCrAlY type. There are shown some EDAX images for quality analysis of stabilized zirconium layers with Y and Mg4O2, X- ray diffraction and chemical distribution for the deposited layers.