High-temperature stability of yttria-stabilized zirconia thermal barrier coating on niobium alloy—C-103

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• 作者：S S PANWAR ; T UMASANKAR PATRO ; K BALASUBRAMANIAN…
• 关键词：Thermal barrier coating ; yttria ; stabilized zirconia ; plasma spraying ; thermal conductivity ; oxidation resistance.
• 刊名：Bulletin of Materials Science
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：39
• 期：1
• 页码：321-329
• 全文大小：1,535 KB
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• 作者单位：S S PANWAR (1) (2)
  T UMASANKAR PATRO (2)
  K BALASUBRAMANIAN (2)
  B VENKATARAMAN (3)
  
  1. Defence Research and Development Laboratory, Kanchanbagh, Hyderabad, 500 058, Telangana, India
  2. Department of Materials Engineering, Defence Institute of Advanced Technology (DU), Girinagar, Pune, 411 025, Maharashtra, India
  3. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, 500 058, Telangana, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Engineering, general
  
• 出版者：Springer India
• ISSN：0973-7669

文摘

Thermal barrier coatings (TBCs) of yttria-stabilized zirconia (YSZ) of different thicknesses with an intermediate bond coat were deposited on C-103 Nb alloy using the air plasma spraying technique. The coatings were subjected to rapid infra-red (IR) heating (∼25°C s−1) up to ∼1250°C and exposed up to 100 s at this temperature with heat flux varying from 55 to 61 W cm−2. The TBCs were found to be stable and intact after the heat treatment. In contrast, at the same conditions, the uncoated C-103 alloy specimen showed extensive oxidation followed by weight loss due to spallation. A maximum temperature drop of ∼200°C was observed on the opposite side of the coated alloy with 600 μm YSZ coat; as against negligible temperature drop in case of bare alloy specimen. The temperature drop was found to increase with the coating thickness of YSZ. The coatings before and after IR heating were investigated by scanning electron microscopy, X-ray diffraction, electron probe microanalysis, microhardness and residual stress measurements in order to understand the effect of thermal shock on the properties of the TBC. On account of these high-temperature properties, YSZ coating along with the bond coat is expected to find potential thermal barrier coating system on niobium alloys for supersonic vehicles.