Investigation of Microstructure and Properties Plasma Sprayed Coatings Based on ZrO2 by Mechanical Indentation Method

V.Oliker,
 
A.A.Prytulyak,
   

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2008, #07/08
http://www.materials.kiev.ua/article/1357

Abstract

Interconnection between mechanical properties of plasma sprayed thermal barrier coatings and properties of feedstock powders were investigated. Powders with the same chemical composition, obtained using hydroxides co-precipitation technology with future air-drying and using cryochemical technology were chosen. Based on the information about TBCs failure mechanisms, it was set and solved an aim to increase plasticity and, consequently, stress relaxation coefficient of ceramic coating. Finer structure of the coating, sprayed from cryo-chemical powder allowed to improve crack-resistance of the coating. Slight reduction of cryopowder sprayed coating hardness should not decrease coating exploitation characteristics.


CRACK RESISTANCE, HARDNESS, MICROSTRUCTURE, PLASTICITY, THERMAL BARRIER COATINGS