Influence of Precursor Densification on Strength Retention of Zirconia-Coated Nextel™610 Fibers

Autor:	Matthias Bockmeyer, Reinhard Krüger
Rok vydání:	2008
Předmět:	Materials science Annealing (metallurgy) Mineralogy engineering.material law.invention Amorphous solid Thermogravimetry Coating law Differential thermal analysis Materials Chemistry Ceramics and Composites engineering Cubic zirconia Calcination Composite material Stress concentration
Zdroj:	Journal of the American Ceramic Society. 91:1070-1076
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1551-2916.2008.02282.x
Popis:	Strength degradation of Nextelt 610 fibers by continuous liquid phase coating was investigated for four different zirconia precursors. The precursors differed regarding their chemical composition (with or without yttrium), phase composition (amorphous or crystalline), and decomposition behavior. Phase transformation and densification of the films were characterized and found to depend on the kind of precursor. Single fiber Weibull’s strength was measured for calcination temperatures between 2501 and 11501C for all precursors. Each precursor had an individual degradation behavior. For an annealing temperature of 11501 Ch ighly damaged (B1600 MPa) and undamaged (43300 MPa) fibers were obtained depending on the kind of precursor. Fiber degradation could be correlated to mechanical stresses. Stress concentration due to inhomogeneous film thickness distribution is proposed as the cause of fiber strength degradation. Full strength could be retained for porous coatings or coatings where stresses were reduced by phase transformation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::26bc08035c0ac3f32f341fb4abb3fb5f https://doi.org/10.1111/j.1551-2916.2008.02282.x Zobrazit plný text záznamu Plný text ve formátu PDF