Tension–compression fatigue of a SiC/SiC ceramic matrix composite at 1200°C in air and in steam

Creep behavior in interlaminar shear of a Hi-NicalonTM/ SiC-B4C composite at 1200∘C in air and in steam

“…Numerous recent studies investigated mechanical behavior of high-performance SiC/SiC composites at elevated temperature [17][18][19][20][21][22][23][24][25][26][27]. Efforts to assess the life-limiting behaviors of SiC/SiC CMCs have been focused mainly on the fiber-dominated properties.…”

Creep of Hi-Nicalon S Ceramic Fiber Tows at 800 deg C in Air and in Silicic Acid-Saturated Steam

“…As such, many efforts have been and continue to be made to overcome the oxidation problem. This has lead to the development of self-healing matrix materials [85][86][87][88][89][90][91], fiber coatings that shield the fiber from the oxidizing environment [47,92], and improvements in SiC fibers to reduce oxygen content and achieve near-stoichiometric fibers [19,20,93].…”

Initial assessment of environmental effects on SiC/SiC composites in helium-cooled nuclear systems

“…These advanced applications in aero-and space industries motivated recent interest on tension/compression fatigue at high temperature in air and steam environments. 43,44 The composites were comprised of HiNicalon TM fibers, pyrolytic fiber coating (with B 4 C overlay) and SiC-based oxidation inhibited matrix containing alternate layers of SiC and B 4 C. The tests showed that the damage and failure of the composites at 1200 o C are caused by oxidation embrittlement in the two environments, air and steam. Fatigue from tension-compression cycles causes more extensive matrix cracking than tension-tension fatigue.…”

“…Damage is significantly accelerated in presence of steam, resulting in reduced fatigue performance. 43,44 Figure 11 shows micrographs of the fracture surfaces in specimens tested in tensioncompression cycles in different environments. They show that a large fraction of fracture surface is oxidized, supporting the above mechanism.…”

“…They show that a large fraction of fracture surface is oxidized, supporting the above mechanism. 44 A micromechanics model of the thermomechanical behavior of minicomposites based on the matrix cracking mechanism in oxidizing environments was proposed by Pailler and Lamon. 45 Matrix cracking is considered as a prerequisite for interphase oxidation.…”