Status of Graphite Oxidation Work

Smith, Rebecca

Idaho National Laboratory

关键词: Dimensions;    Air;    Oxidation;    Furnaces;    11 Nuclear Fuel Cycle And Fuel Materials;   

DOI  :  10.2172/984551
RP-ID  :  INL/EXT-10-18880
RP-ID  :  DE-AC07-05ID14517
RP-ID  :  984551

美国|英语

来源: UNT Digital Library

【 摘 要 】

Data were developed to compare the extent of structural damage associated with high temperature exposure to an air leak. Two materials, NBG-18 graphite and unpurified PCEA graphite have been tested as of this report. The scope was limited to isothermal oxidation at a single temperature, 750°C. Ambient post-oxidation compression strength testing was performed for three levels of burn off (1%, 5%, and 10% mass loss) for two leak scenarios: 100% air and 10% air in helium. Temperature, gas flow, and dynamic mass loss oxidation conditions were monitored and recorded for each sample. The oxidation period was controlled with flow of inert gas during the thermal ramp and upon cool down with a constant 10 liter per minute flow maintained throughout furnace operation. Compressive strengths of parallel un-oxidized samples were tested to assess the relative mass loss effects. In addition to baseline samples matching the un-oxidized dimensions of the oxidized samples, two sets of mechanically reduced samples were prepared. One set was trimmed to achieve the desired mass loss by removing an effectively uniform depth from the geometric surface of the sample. The other set was cored to produce a full penetration axial hole down the center of each sample.