Materials development and evaluation for the ceramic helical expander

Technical Report · Thu Feb 01 04:00:00 EST 1979

OSTI ID:6319122

Landingham, R L; Taylor, R W

The supporting role of the materials program for the ceramic helical expander program is described. The materials problems for this rotory expander in an extremely severe environment - a direct coal-fired Brayton topping cycle is defined. Readily available materials and methods are evaluated for possible solution to these material problems as well as initiating some longer-range studies to improve reliability. A preliminary screening of materials in hot coal-fired environments to select candidate materials and coating, was made, but there is a need to perform more detailed evaluations of these candidate materials-reaction-bonded silicon nitride (RBSN) and Si--Al--O--N (Sialon) system- and coatings-chemical-vapor-deposited silicon nitride (CVD-Si/sub 3/N/sub 4/) and CVD-Sialon. Termination of the helical expander program abruptly stopped the materials program during this evaluation.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6319122
• Report Number(s): UCRL-17899(Rev.1)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
AEROSOL WASTES
BRAYTON CYCLE
CARBONACEOUS MATERIALS
CAVITIES
CERAMICS
CHEMICAL REACTIONS
COAL
CORROSION
CORROSIVE EFFECTS
DEPOSITION
ENERGY SOURCES
EROSION
FLY ASH
FOSSIL FUELS
FOULING
FUELS
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
POROSITY
POWDERS
ROTORS
SILICON COMPOUNDS
SILICON NITRIDES
STABILITY
SURFACE COATING
THERMODYNAMIC CYCLES
TOPPING CYCLES
WASTES