Compared to Si_3N_4, SiAlON has a better stability at high temperatures, which can be used in steel-making. MgAlON as a kind of refractory for clean steel and steel of super quality has a better stability at low temperatures than AlON. Al_4O_4 C and Al_2OC with chrome-free and low carbon are strengthened phases in resin bonded Al-Al_2O_3 composite, which can be applied as continuous casting refractory. The review represented the phases in Si-Al-N-O system bonded composites, phases in Si-Al-C-N-O system bond...