Glass phase has a great influence on structure and properties of MoSi2-BAS coating.
The liquid glass phase content was controlled by the addition amount of B2O3.
Porosity of coating decreases and coating becomes denser as B2O3 content increases.
The coatings with 2 wt%–4 wt% B2O3 content form a desired gradient structure.
Gradient coating exhibits excellent bonding strength and thermal shock resistance.