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A Thermoanalytical Study of the Conversion of Amorphous Si – Ti – C – O Fibers to SiC
Author(s) -
Jacobson Nathan S.,
Kline Sara E.
Publication year - 2012
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/j.1744-7402.2011.02696.x
Subject(s) - materials science , thermogravimetric analysis , amorphous solid , scanning electron microscope , kinetics , microstructure , fiber , activation energy , diffraction , porosity , phase (matter) , analytical chemistry (journal) , chemical engineering , crystallography , composite material , chemistry , optics , organic chemistry , physics , quantum mechanics , engineering
The conversion of polytitanocarbosilane fibers to SiC has been studied from 1400°C to 1600°C. Thermochemical modeling indicated the stable phases were SiC and TiC . Kinetics were studied with a thermogravimetric method and post heat‐treatment phases, and microstructures were studied with X ‐ray diffraction and scanning electron microscopy. Kinetics exhibit a strong temperature dependence and an activation energy of 443.3 ± 11.7 kJ/mol. This suggests that a chemical reaction step is rate‐limiting. X ‐ray diffraction shows the conversion of an amorphous phase to crystalline SiC . Electron microscopy shows the development of internal porosity and large grains on the fiber surface, particularly at the higher temperatures.