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. Quarterly progress report No. 10, October 1, 1996--December 31, 1996
In high temperature engineering applications, commercially available silicon nitride non-oxide ceramics have retained special attention because of their superior thermal, mechanical, and chemical properties. These properties mainly include a high fracture strength and toughness, a low coefficient of thermal expansion relative to other ceramics, good thermal shock resistance, and good chemical stability. With silicon carbide, silicon nitride was the second material selected for heat exchangers in the High Temperature Advanced Furnace being developed under the DOE Combustion 2000 program. Their potential use in heat exchangers is, however, limited in time since both materials corrode severely in high temperature coal combustion atmospheres containing alkali compounds. Thus, this research will first focus on enhancing the performance of Si{sub 3}N{sub 4} ceramics by coating them with alkali corrosion resistant materials such as CMZP and Mg-doped Al{sub 2}TiO{sub 5} oxide ceramics.
- Research Organization:
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Materials Science and Engineering
- Sponsoring Organization:
- USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
- DOE Contract Number:
- FG22-94PC94224
- OSTI ID:
- 484587
- Report Number(s):
- DOE/PC/94224-T12; ON: DE97052484; TRN: 97:003803
- Resource Relation:
- Other Information: PBD: 15 Jan 1997
- Country of Publication:
- United States
- Language:
- English
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