Improved Fiber-Reinforced SiC Composites Fabricated by Chemical Vapor Infiltration

Processing Aluminum Nitride‐Silicon Carbide Composites via Polymer Infiltration and Pyrolysis of Polymethylsilane, a Precursor to Stoichiometric Silicon Carbide

“…P ARTICULATE-REINFORCED ceramic-matrix composites (PRCs), when properly designed and processed, can offer superior high-temperature strength and stiffness, chemical inertness, and high specific strengths of potential use in advanced structural applications. [1][2][3][4][5][6] Unfortunately, conventional processing of PRCs often results in microstructures with broad grainsize distributions that severely limit mechanical properties. 6 Efforts to realize PRCs with better mechanical properties have recently focused on producing nanocomposite materials.…”

Carbon fiber reinforced silicon carbide mini-composites-solution approach

“…The primary reason for this interest lies in the assumption that strong ceramic fibers can prevent catastrophic brittle failure in ceramics by providing various energy-dissipation processes during crack advance (Evans, 1989). Early works utilizing ceramic fibers in ceramic matrices demonstrated the potential of this approach (Prewo and Brennan, 1980;Stinton et al, 1985Stinton et al, , 1986Shetty et al, 1985;Naslain et al, 2001;Tressler, 1986;Fitzer and Gadow, 1986). Carbon fiber reinforced silicon carbide (C/SiC) composites provide excellent thermo-mechanical properties at temperatures up to 2000 • C (Zhong et al, 1998;He et al, 2001;Mentz and Muller, 2006).…”

“…Fiber-reinforced-ceramic-matrix composites have recently attracted attention for use in high-temperature structural applications (Stinton et al, 1986;Prewo, 1989). The primary reason for this interest lies in the assumption that strong ceramic fibers can prevent catastrophic brittle failure in ceramics by providing various energy-dissipation processes during crack advance (Evans, 1989).…”

Ceramic matrix composites (CMC)

“…This composite is fabricated by pouring glass in the gaps of Nicalon fabrics using the hot press method, and taking advantage of the fact that glass viscosity becomes lower at high temperatures. Another breakthrough is Nicalon fiber-reinforced SiC composites (Nicalon/SiC) [12,13 ] fabricated by using the CVI (Chemical Vapor Infiltration) method. Research on these types of composites is also conducted using tylanno fibers of Si-Ti-C-O type that can be obtained from poly(titanocarbosilane) marketed by Ube Industries, Ltd. As a new type of composites, tylanno fiber sintered ceramics (Tylannohex) [14] are also under development.…”

“…This CMC has been synthesized at the Oak Ridge National Laboratory (ORNL) by the CVI method using unidirectional fibers, 2-D fabrics and chops made of Nicalon as reinforcement materials [13].…”