Low heat rejection diesel ceramic coupon tests

Conference · Tue Jan 01 04:00:00 EST 1991

OSTI ID:6024897

Brinkman, C R; Liu, K C; Graves, R L; West, B H

Results are reported from studies in which several monolithic ceramic materials in the form of modulus-of-rupture bars were exposed for 100 h to the combustion conditions found in either a small single- or two-cylinder diesel engine. Fuels included a standard Phillips D-2 diesel or synthetic mixture of the Phillips D-2 and an aromatic blend. The ceramics included two commercial grades of partially stabilized zirconia (PSZ-TS and PSZ-MS), silicon nitride (GTE WESGO SNW-1000 and Norton NT-154), and (Hexoloy SA) silicon carbide. Significant reductions in postexposure four-point bend fracture strength occurred in the PSZ-TS material irrespective of whether it was exposed in the single- or two-cylinder engine. Only a small decrease in fracture strength occurred in the PSZ-MS material, and essentially no decrease in fracture strength occurred in the silicon nitride (GTE WESGO SNW-1000) when tested at room temperature. The Norton NT-154 silicon nitride was tested at both room temperature and at 700{degree}C over several strain rates ranging from 1 {times} 10{sup {minus}4} to 1 {times} 10{sup {minus}7}s{sup {minus}1}. Room temperature tests indicated that the engine exposed bars actually showed a slight increase in average strength, 830 MPa, versus 771 MPa for the unexposed material. Elevated temperature strength comparisons showed no reduction in strength due to previous engine exposure. Hexoloy SA silicon carbide showed no reduction in fracture strength when tested at 700{degree}C. 4 refs., 12 figs., 1 tab.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6024897
• Report Number(s): CONF-910617-1; ON: DE91006274
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330102* -- Internal Combustion Engines-- Diesel
36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CARBIDES
CARBON COMPOUNDS
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
DIESEL ENGINES
ENGINES
FLEXURAL STRENGTH
FRACTURE PROPERTIES
HEAT ENGINES
HIGH TEMPERATURE
INTERNAL COMBUSTION ENGINES
LASER SPECTROSCOPY
MATERIALS TESTING
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
NITRIDES
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
RAMAN SPECTROSCOPY
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
SPECTROSCOPY
TEMPERATURE MEASUREMENT
TESTING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES