“…Recently, Yeh and Kang reported the SHS of TiB 2 / mullite, TaB 2 /mullite, NbB 2 /mullite, TaB/TaB 2 /mullite composites [245][246][247][248]. These materials were composed of ultra-high temperature TiB 2 , TaB 2 , and NbB 2 ceramics and mullite (Al 4+2x Si 2-2x O 10-x , x = 0.2-0.9) phases and widely used in various high-temperature structural applications due to many favourable properties, such as: high melting point, high creep resistance, good thermal stability in harsh oxidising environments, good chemical resistance to alkalis and acids, high thermal shock resistance, low thermal expansion coefficient, etc.…”