Abstract
Decaborane was investigated as a precursor for boron-based densification aid to polymer-derived SiC fibers. By means of acid-base interaction, the infusibility of polycarbosilane-based polymers upon pyrolysis was enhanced significantly. The beneficial effect of decaborane toward improved thermomechanical stability took place when decaborane-doped SiC fibers were treated at 1800°C. With the decaborane content at 2–4 wt%, the strength retention after the 1800°C treatment was enhanced as high as 80%. Elastic modulus was improved as well, partly due to increased density and crystallinity. Improved densification by decaborane resulted in the fiber density as high as 2840 kg/m3, which corresponds to 89% densification. Decaborane also increased the Weibull modulus after the 1800°C treatment, indicating an enhancement in fiber reliability.
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Choi, G.J., Toreki, W. & Batich, C.D. Improved thermomechanical stability of polymer-derived silicon carbide fibers by decaborane incorporation. Journal of Materials Science 35, 2421–2427 (2000). https://doi.org/10.1023/A:1004797014444
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DOI: https://doi.org/10.1023/A:1004797014444