Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 690, Issue -, Pages 63-71Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.08.073
Keywords
High emissivity coating; Fibrous ceramic; Rapid sintering method; Thermal shock behavior
Categories
Funding
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_15R35]
- Industry Program of Science and Technology Support Project of Jiangsu Province [BE2014128]
- National Aeronautical Science Foundation of China [201452T4001]
- Major Program of Natural Science Fund in Colleges and Universities of Jiangsu Province [15KJA430005]
- Prospective Joint Research Program of Jiangsu Province [BY2015005-01]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) - China Postdoctoral Science Foundation [2015M570442]
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A MoSi2-TaSi2-borosilicate glass porous coating was designed and prepared on fibrous ZrO2 ceramic with slurry dipping and subsequent rapid sintering method. The microstructure, radiative property and thermal shock behavior of the coating have been investigated. The results show the coating presents a top Ta-Si-O compound glass layer and a porous MoSi2-TaSi2-borosilicate glass inner layer. The total emissivity of the coating is up to 0.88 in the range of 0.3-2.5 mu m and 0.87 in the range of 2.5-15 mu m at room temperature. The increased surface roughness leads to the increased emissivity, which can be explained by V-shaped grooves model. The coating turns into a dense structure and presents an interlocking structure in the interfacial layer after thermal cycling between 1673 K and room temperature 10 times, exhibiting excellent thermal shock resistance, which was attributed to the synergistic effect of porous structure and the match of thermal expansion coefficient between the coating and substrate. (C) 2016 Elsevier B.V. All rights reserved.
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