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Determination of silicon carbide fiber electrical resistivity at elevated temperature
Author(s) -
Smith Craig,
Morscher Greg
Publication year - 2016
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12627
Subject(s) - electrical resistivity and conductivity , materials science , isothermal process , fiber , silicon carbide , composite material , electrical resistance and conductance , carbide , electrical engineering , thermodynamics , physics , engineering
The resistance of Sylramic‐ iBN and Hi‐Nicalon SiC fiber tows was measured at elevated temperature in air. Resistivity could not be directly measured, since the fibers passed through a furnace with varying temperature along the length. The resistivity of the isothermal section of the fiber tow was modeled by a series circuit of finite elements. Existing data for Hi‐Nicalon resistivity vs temperature was used to verify the model and then extend it to Sylramic‐ iBN , for which there is no literature data readily available. The model matched experimental values with low overall error (<±14%). Fiber resistivity decreased by more than two orders of magnitude when heating from 25°C to 1400°C. Sylramic‐ iBN tow resistance was also measured during a 500 hour hold at 1315°C. The resistance increased by more than 140% during heat treatment. The resistance change correlated well with the decrease in SiC fiber diameter that resulted from oxidation.