The Role of Bulk Nucleation in the Formation of Crystalline Cordierite Coatings Produced by Air Plasma Spraying
Abstract
Near stoichiometric cordierite (2MgO-2Al2O3-5SiO2) glasses doped with 6.3, 8.3 and 10.1 weight percent (wt.%) TiO2 were plasma sprayed onto SiO2-based refractory concrete substrates. Substrate temperatures were controlled such that the maximum surface temperature exceeded the crystallization temperature during plasma spraying. Only the cordierite powders containing 8.3 and 10.1 wt.% TiO2 produced crystalline coatings. For compositions with less than 8 wt.% TiO2 the crystallization is believed to be controlled by surface nucleation at imperfections. Surface nucleation became more difficult with increasing preheat temperature and is related to improved wetting between coating splats. Bulk nucleation-controlled crystallization was observed at compositions above 8 wt.% TiO2 and the presence of Al2TiO5 was detected in these compositions.
Recommended Citation
D. T. Weaver et al., "The Role of Bulk Nucleation in the Formation of Crystalline Cordierite Coatings Produced by Air Plasma Spraying," Materials Science and Engineering: A, Elsevier, Jan 2003.
The definitive version is available at https://doi.org/10.1016/S0921-5093(02)00119-3
Department(s)
Materials Science and Engineering
Sponsor(s)
Boeing Company. Commercial Airplane Group
Keywords and Phrases
Plasma Spray; Cordierite; Crystallization
International Standard Serial Number (ISSN)
0921-5093
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2003 Elsevier, All rights reserved.
Publication Date
01 Jan 2003
