@article{7b368fa41c6743ec952be83ffb8dd8eb,
title = "Rapid Heating of Silicon Carbide Fibers under Radio Frequency Fields and Application in Curing Preceramic Polymer Composites",
abstract = "Silicon carbide (SiC) fibers are widely used as a reinforcement in ceramic matrix composites due to their high mechanical strength and superior thermal resistance. Here, we investigate the rapid radio frequency (RF) heating response of two types of SiC fibers (Hi-Nicalon and Sylramic) in the 1-200 MHz frequency range. Hi-Nicalon fibers exhibit a surprisingly rapid RF heating response of 240 °C/s in the perpendicular orientation, and this property could be exploited for oven-free and noncontact processing of composites with SiC fibers. The presence of excess carbon on the surface of Hi-Nicalon fibers is most likely responsible for the RF heating response and significantly higher temperatures in the parallel as compared to perpendicular alignment of fibers to the electric field. The RF heating response of Hi-Nicalon SiC fibers was utilized to heat preceramic polymers (polycarbosilanes) infiltrated in SiC fibers and cure them to ceramic matrix composites (CMCs) using RF applicators. A noncontact RF heating setup to pyrolyze the precursor polymers under inert conditions and make SiC/SiC composites is also developed.",
keywords = "RF, polymer curing, silicon carbide fibers",
author = "Nutan Patil and Xiaofei Zhao and Mishra, {Naveen K.} and Saed, {Mohammad A.} and Miladin Radovic and Green, {Micah J.}",
note = "Funding Information: The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.9b14971 . d T /d t data for Hi-Nicalon SiC fibers, schematic of coplanar applicator, RF response of Hi-Nicalon S, Hi-Nicalon, and Sylramic fibers, schematic SiC fiber with excess carbon on surface and bulk SiC in core, effect of compactness on RF heating response of SiC nanoparticles, SEM image of SiC nanoparticles in loose vs compact form, C 1s XPS spectrum of SiC nanoparticles, XRD spectrum of SiC nanoparticles, RF response of neat polycarbosilanes, RF frequency sweep on Hi-Nicalon SiC fibers in PCS, FE-SEM images of oven-cured polycarbosilane in SiC, TGA data for neat polycarbosilane, EDS data for SiC fibers, supplier data for Hi-Nicalon and Sylramic SiC fibers ( PDF ) This work is funded by Army Research Office grant W911NF-18-1-0109. The authors declare the following competing financial interest(s): The technology described in the paper is the topic of a provisional patent held by Texas A&M. Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",
year = "2019",
month = dec,
day = "11",
doi = "10.1021/acsami.9b14971",
language = "English",
volume = "11",
pages = "46132--46139",
journal = "ACS Applied Materials and Interfaces",
issn = "1944-8244",
number = "49",
}