Analysis of candidate silicon carbide recuperator materials exposed to industrial furnace environments
Several SiC ceramics were exposed to the combustion environment in six industrial furnaces to determine their corrosion resistance. The matrials were sintered-..cap alpha.. (Hexoloy SA), Sintride, recrystallized (NC-400), CVD SiC coated NC-400, siliconized (NC-430), reaction sintered (SC-X and KT), and Si/sub 3/N/sub 4/-bounded (C/75 and CN-178). Tubes of these materials were exposed in two aluminum remelt furnaces, a forge furnace, a steel reheat furnace, and two steel soaking pits at temperatures of 925 to 1250/sup 0/C for periods of 530 to 5545 h. Significant corrosion occurred in specimens exposed to aluminum remelt furnaces and one of the steel soaking pits, whereas corrosion in the other furnaces was substantially less or negligible. The average C-ring fracture strengths of Hexoloy SA and NC-430, the only materials so tested, were substantially affected by the exposures. The lowest strength in Hexoloy SA occurred in specimens exposed in an aluminum remelt furnace, while the lowest strength in NC-430 occurred in specimens exposed in a steel soaking pit. These results show that SiC ceramics are susceptible to both corrosion and strength degradation when exposed to certain furnace environments.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5275519
- Report Number(s):
- ORNL/TM-9677; ON: DE85018176
- Country of Publication:
- United States
- Language:
- English
Similar Records
Crack-growth resistance-curve behavior in silicon carbide: Small versus long cracks
Effects of coal slag corrosion on the mechanical properties of sintered {alpha}-silicon carbide
Related Subjects
36 MATERIALS SCIENCE
HEAT RECOVERY
MATERIALS TESTING
SILICON CARBIDES
CORROSION RESISTANCE
WASTE HEAT UTILIZATION
FRACTURE PROPERTIES
FURNACES
VERY HIGH TEMPERATURE
CARBIDES
CARBON COMPOUNDS
ENERGY RECOVERY
MECHANICAL PROPERTIES
RECOVERY
SILICON COMPOUNDS
TESTING
WASTE PRODUCT UTILIZATION
320304* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Waste Heat Recovery & Utilization
360205 - Ceramics
Cermets
& Refractories- Corrosion & Erosion