Comparative study of interfacial reaction between superalloy substrate and glass coating with and without alumina particles incorporation

► Interfacial reaction between glass coating and superalloy substrate is identified. ► Gaseous products of Zn and/or Na resulted in bubbling of glass coating. ► Alumina particles addition suppresses the progressing of interfacial reaction. ► Intact alumina/glass composite coatings were prepared. ► Mechanism of alumina particles suppressing interfacial reaction was discussed.