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High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)

An International Journal

ISSN for PRINT: 1093-3611

Institutional price:	$604.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2005, Volume9

156 pages

DOI: 10.1615/HighTempMatProc.v9.i3

Issue price - $144.00

MACROCRACK FORMATION IN PLASMA-SPRAYED YSZ TBCS WHEN SPRAYING THICK PASSES

A. Tricoire
SPCTS, 123 avenue Albert Thomas, 87060 Limoges cedex, France

Michel Vardelle
Laboratory Science of Ceramic and Surface Treatment Processes (SPCTS) XJMR-CNRS 6638 Faculty of Sciences - Univ. of Limoges 123 A. Albert Thomas 87060 Limoges Cedex, France

Pierre Fauchais
Laboratoire Sciences des Precedes Ceramiques et de Traitements de Surface, UMR 6638 CNRS-Universite de Limoges, faculte des Sciences et Technique, conventionne avec le CEA n° M08, France

F. Braillard
SNECMA Services, ZI Nord, 1 rue Maryse Bastie, BP 129, 86101 Chatellerault cedex, France

A. Malie
SNECMA Services, ZI Nord, 1 rue Maryse Bastie, BP 129, 86101 Chatellerault cedex, France

P. Bengtsson
SNECMA Moteurs, RN 7, BP 81, 91003 Evry cedex, France

ABSTRACT

The aim of this work is to study the formation of macrocracks orthogonal to the substrate in yttria-stabilised zirconia coatings, deposited in one or two thick passes (more than a hundred urn each), by a direct current (DC) plasma torch. Zirconia was air plasma sprayed on Hastelloy X substrates, with a NiCrAlY bond coat. The different parameters, which control this phenomenon, are considered through a statistical approach. A special attention is devoted to the quenching stress during deposition. A particular resulting microstructure with columnar zirconia grains is presented. A search of the most influent spray parameters has also been conducted.