Stability of interfaces in calcium aluminosilicate matrix/Nicalon SiC fibre composites

Nondestructive Characterization of Thermal Shock and Oxidation-Induced Damage by Flash Diffusivity

“…Therefore, little or no change in sample properties and performance is expected. Such behavior has been seen in several glass-ceramic composite systems reported in the literature [3,20,22].…”

Low‐Temperature Oxidation Embrittlement of SiC (Nicalon™)/CAS Ceramic Matrix Composites

“…This behavior is indicative of oxidation of the exposed Si–O–C fiber surface, forming amorphous SiO 2 with an associated increase in mass. Several previous studies have noted the formation of SiO 2 ligaments that bridge across the fiber/matrix interface within this intermediate temperature range 12,13 . Scanning Auger microscopy has also demonstrated the presence of SiO 2 regions on the fiber surface in the case of Nicalon ™ /CAS oxidized at 600°C for 100 h 27…”

“…A number of studies have addressed issues related to the environmental stability of SiC‐based fiber‐reinforced CMCs, from both experimental and theoretical perspectives 7–20 . Several of these have primarily assessed the effects of high temperature (i.e., >800°C) exposure on materials with a carbon‐based fiber/matrix interlayers in an oxidizing environment, typically under fast fracture conditions 7–10 .…”

Notch sensitivity of fatigue life in a Sylramic TM/SiC composite at elevated temperature

“…The embrittlement most commonly occurs by oxygen ingress through matrix cracks, followed by reaction of the oxygen with the fibers and the fiber coatings [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. The problem is particularly severe at intermediate temperatures (500-900 C) [6,15,[23][24][25][26][27][28][29][30][31][32][33][34].…”