Microstructural observation of the sintering behavior of nanostructured yttria stabilized zirconia

Racek, O., Berndt, C.C., Guru, D., and Heberlein, J. (2005) Microstructural observation of the sintering behavior of nanostructured yttria stabilized zirconia. In: Proceedings of International Thermal Spray Conference & Exposition. From: International Thermal Spray Conference & Exposition, 2-4 May 2005, Basel, Switzerland.

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Multilayer thermal barrier coatings are being investigated for high temperature applications by employing a strain accommodating interlayer. Plasma sprayed coatings of nanostructured feedstock have shown promise in this direction. Layers of nanostructured yttria stabilized zirconia (nano-YSZ) and conventional YSZ were deposited on mullite substrates using the triple torch plasma reactor (TTPR), and on NiCrAIY coated steel substrates using the Praxair SG-100 plasma torch. The coatings were heat treated and the microstructure evaluated. Heat treating the samples lead to the formation of larger pores with a significant proportion of partially molten particles. The porosity evolved from the partial sintering of the nano -agglomerates. Porosity change during the sintering process was measured and the microstructure observed using electron microscopy. The nanostructured coatings were compared to conventional YSZ coatings.

Item ID: 14823
Item Type: Conference Item (Research - E1)
ISBN: 978-3-87155-793-4
Keywords: fracture mechanisms; microstructure; nanomaterials; process parameters; thermal spray
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Date Deposited: 28 Nov 2010 23:41
FoR Codes: 09 ENGINEERING > 0913 Mechanical Engineering > 091399 Mechanical Engineering not elsewhere classified @ 45%
09 ENGINEERING > 0901 Aerospace Engineering > 090103 Aerospace Structures @ 30%
09 ENGINEERING > 0912 Materials Engineering > 091202 Composite and Hybrid Materials @ 25%
SEO Codes: 86 MANUFACTURING > 8610 Ceramics, Glass and Industrial Mineral Products > 861002 Ceramics @ 70%
86 MANUFACTURING > 8613 Transport Equipment > 861301 Aerospace Equipment @ 30%
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