High temperature alkali corrosion of ceramics in coal gas: Final report

Technical Report · Sat Dec 31 04:00:00 EST 1994

DOI:https://doi.org/10.2172/61097· OSTI ID:61097

Pickrell, G R; Sun, T; Brown, Jr, J J

There are several ceramic materials which are currently being considered for use as structural elements in coal combustion and coal conversion systems because of their thermal and mechanical properties. These include alumina (refractories, membranes, heat engines); silicon carbide and silicon nitride (turbine engines, internal combustion engines, heat exchangers, particulate filters); zirconia (internal combustion engines, turbine engines, refractories); and mullite and cordierite (particulate filters, refractories, heat exchangers). High temperature alkali corrosion has been known to cause premature failure of ceramic components used in advanced high temperature coal combustion systems such as coal gasification and clean-up, coal fired gas turbines, and high efficiency heat engines. The objective of this research is to systematically evaluate the alkali corrosion resistance of the most commonly used structural ceramics including silicon carbide, silicon nitride, cordierite, mullite, alumina, aluminum titanate, and zirconia. The study consists of identification of the alkali reaction products and determination of the kinetics of the alkali reactions as a function of temperature and time. 145 refs., 29 figs., 12 tabs.

• Research Organization: Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Materials Science and Engineering
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-91PC91309
• OSTI ID: 61097
• Report Number(s): DOE/PC/91309--T14; ON: DE95011387
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
ALKALI METALS
ALUMINIUM OXIDES
ALUMINIUM SILICATES
CALCIUM
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CORROSION PRODUCTS
CORROSION RESISTANCE
CORROSIVE EFFECTS
EXPERIMENTAL DATA
IRON SILICATES
MAGNESIUM SILICATES
MEASURING METHODS
MULLITE
PHASE DIAGRAMS
POTASSIUM
PROGRESS REPORT
SILICON CARBIDES
SILICON NITRIDES
SODIUM
TITANIUM OXIDES
USES
ZIRCONIUM OXIDES