High Temperature Alkali Corrosion of Dense SiC and Si(3)N(4) Coated with CMZP and Mg-Doped Al(2) TiO(5) in Coal Gas.
Hot pressed Si{sub 3}N{sub 4} has been extensively studied in the past years mainly because it is a potential candidate for high temperature structural applications. If its behavior in alkaline environments has been widely investigated and is now well understood, only a few authors have conducted research on thin film to enhance Si{sub 3}N{sub 4} lifetime in harsh environments. Thus, it is the first objective of this work to develop thin film of CMZP and Mg doped Al{sub 2}TiO{sub 5} using the sol-gel process and the dip coating technique. In the previous report relatively good coverage of the substrate surface was achieved with low concentration solutions and double coatings. However, the aggregation of the sol-gel at the bottom of some samples suggested that more viscous sol-gels, i.e. higher concentrations, could alleviate this phenomenon. This report will therefore present the results obtained with more concentrated solutions and also those obtained with two other CMZP solutions utilizing different precursors.
- Research Organization:
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Materials Engineering
- Sponsoring Organization:
- USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
- DOE Contract Number:
- FG22-94PC94224
- OSTI ID:
- 599006
- Report Number(s):
- DOE/PC/94224-T13; ON: DE98051695
- Resource Relation:
- Other Information: PBD: 1 Jul 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
High temperature alkali corrosion of dense SiC and Si{sub 3}N{sub 4} coated with CMZP and Mg-doped Al{sub 2}TiO{sub 5} in coal gas
High Temperature Akali Corrosion of Dense SiC and Si(3)N(4) Coated with CMZP and Mg-Doped Al(2)TiO(5) in Coal Gas