The complexity of the matrix micro structure in SiC-fiber-reinforced glass ceramic composites

In this paper a critical examination of the diagrams of different silicate systems is presented: LAS, MAS YAS, MLAS and YMAS (A: alumina; L: lithia; M: magnesia; S: silica; Y: yttria). These systems have been developed to fabricate ceramic matrix composites based on a glass ceramic matrix, because of their low thermal expansion coefficient and good mechanical properties up to 1000 °C. The observations and microanalyses, by transmission electron microscopy, of different batches of MLAS and YMAS confirm the complexity of the systems investigated.