Effect of grain boundary segregation on high-temperature strength of hot-pressed silicon carbide

High temperature strength of silicon carbide sintered with 1 wt.% aluminum nitride and lutetium oxide

“…Although the SiC-SiC boundaries looked clean in the HRTEM images, segregation of some atoms are expected to be present on the boundaries. 32,33 In a previous work, 13 the chemistry of the SiC-SiC boundaries in the SiC ceramics sintered with 10 vol% AlN-Lu 2 O 3 was qualitatively analyzed by Auger electron spectroscopy (AES). The AES spectrum on the grains fractured intergranularly detected the segregation of Lu, N and O atoms as well as Si and C atoms at the SiC-SiC boundaries.…”

Strengthening/toughening of laminated SiCw/SiC ceramic composites by heat treatment

“…However, the liquid phase sintered SiC composites without IGP or with refractory interfacial phases can maintain its RT strength up to 1600 •C [15]. In addition, the solid phase sintered SiC composites without IGP can maintain its RT strength up to 1500 •C [16,17]. Based on above results, it can be concluded that the high-temperature strength of the composites is dependent on the interfacial bonding strength of whisker/matrix.…”

Modelling the effect of temperature and damage on the fracture strength of ultra-high temperature ceramics

“…Some investigations have described the effects of components, processing techniques or microstructures on the performances of various UHTCs (Wuchina et al 2004;Song et al 2003;Huang et al 2003;Melendez-Martinez et al 2002;Kinoshiya et al 1997;Kim et al 2007). Much effort has also gone into developing fracture strength theories for ceramics.…”