Title page for ETD etd-08222008-063634


Type of Document Master's Thesis
Author Yang, Shaokai
URN etd-08222008-063634
Title Corrosion resistant CMZP and Mg-Al2TiO5 coatings for SiC ceramics
Degree Master of Science
Department Materials Science and Engineering
Advisory Committee
Advisor Name Title
Brown, Jesse J. Jr. Committee Chair
Hirschfeld, Deidre A. Committee Member
Kampe, Stephen L. Committee Member
Keywords
  • coating
  • SiC
  • Mg-Al2TiO5
  • CMZP
  • corrosion
Date of Defense 1996-05-05
Availability restricted
Abstract
Thin film coatings of (Cao.6Mg0.4)Zr4(P04)6 (CMZP) and Mg stabilized AhTiOs ( Mg-Ah Ti05 ) on dense SiC substrates were investigated using sol-gel coating techniques. The thickness and quality of both CMZP and Mg-Ah Ti05 coatings were found to depend on the solution concentration and lift rate. Double coatings were applied to obtain homogeneous and crack-free coatings. The quality of double coatings was influenced by different first and second coating thickness. The CMZP coated samples were fired in controlled atmospheres to have the pure CMZP phase. Unhydrolyzed solution of Mg-AhTiOs was utilized instead of hydrolyzed solution to improve the quality of Mg-AhTiOs coatings. Aging process was found to improve the quality of CMZP and Mg-Ah TiOs coatings. SiC samples coated with CMZP and Mg-Ah TiOs exhibited good thermal shock resistance and greatly improved the high temperature alkali corrosion resistance.
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