Materials research for the clean utilization of coal. Quarterly progress report, October-December 1979. [1400/sup 0/C to 1600/sup 0/C]

Technical Report · Mon Jan 01 00:00:00 EST 1979

DOI:https://doi.org/10.2172/6723429· OSTI ID:6723429

Work was concentrated on completing the evaluation of the chrome-spinel refractory (Corhart RFG); this includes creep and swelling measurements at 1400/sup 0/C, 1500/sup 0/C and 1600/sup 0/C. The results indicated considerable deformation at all testing temperatures. The specimen tested at 91 psi and 1600/sup 0/C failed catastophically. Four new furnaces will be installed for the planned expansion of the creep facilities. The dependence of the electrical conductivity of Y /sub 95/Ca/sub 05/CrO/sub 3/ on oxygen pressure in the range of pressures from 10/sup 0/ to 10/sup -6/ atmospheres have been completed for temperatures from 1300/sup 0/ to 1600/sup 0/C. The apparatus has been rebuilt to allow measurements in the high temperature range at oxygen pressure from 10/sup -6/ to 10/sup -15/ atmospheres. A three probe electrochemical cell has been constructed and the electrochemical effects measured at a temperature of 1254/sup 0/C. This cell allows the measurement of slag-electrode voltages as a function of time and ultimate analyses of the electrochemical effects. The first series of experiments on the electrical conductivity of Bow NH slag has been completed. The conductivity at low temperatures (below 1100/sup 0/C) depends on the crystalline state of the slag. The conductivity at high temperature (above 1400/sup 0/C) is independent of the oxygen pressure and of the amount of K present at least up to 6% by weight. Type 304 stainless steel tubes, cooled to 400/sup 0/C, 500/sup 0/C and 590/sup 0/C, were exposed to fuel rich and oxygen rich hot gas streams seeded with a mixture of 80% by weight K/sub 2/CO/sub 3/ and 20% by weight K/sub 2/SO/sub 4/.

• Research Organization: National Bureau of Standards, Washington, DC (USA). Center for Materials Science
• DOE Contract Number: EA-77-A-01-6010
• OSTI ID: 6723429
• Report Number(s): FE-6010-22
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
COAL-FIRED MHD GENERATORS
MATERIALS TESTING
REFRACTORIES
CORROSION
CREEP
SLAGS
ELECTRIC CONDUCTIVITY
CORROSIVE EFFECTS
DEFORMATION
DEPOSITION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FAILURES
POTASSIUM CARBONATES
POTASSIUM SULFATES
STAINLESS STEEL-304
TEMPERATURE DEPENDENCE
X-RAY FLUORESCENCE ANALYSIS
ALKALI METAL COMPOUNDS
ALLOYS
CARBON COMPOUNDS
CARBONATES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
DATA
DIRECT ENERGY CONVERTERS
ELECTRICAL PROPERTIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MHD GENERATORS
MICROSCOPY
NICKEL ALLOYS
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
STAINLESS STEELS
STEELS
SULFATES
SULFUR COMPOUNDS
TESTING
X-RAY EMISSION ANALYSIS
300103* - MHD Generators- Materials
Components
& Auxiliaries
360205 - Ceramics
Cermets
& Refractories- Corrosion & Erosion