Environmental barrier coating (EBC) is a surface protection layer established between the service environment and the engine material to prevent or reduce the environmental erosion of the engine. Mullite is regarded as an important material for environmental barrier coating due to its good high temperature resistance

chemical compatibility， oxidation resistance and thermal conductivity. The preparation process of nanostructured mullite feedstock was studied

and the purpose was to prepare nanostructured feedstock with good sphericity

smooth surface

good fluidity and high density. This paper uses nano Al

2

O

3

and nano SiO

2

as raw materials

and uses spray drying and solid phase sinterin

g methods to prepare nanostructured mullite feedstock. The microstructure and morphology of feedstock at different heat treatment temperatures were studied by means of X-ray diffractometer and scanning electron microscopy. The experimental results show that the sphericity of solid-phase sintering at 1300 ℃ + 150 min is consistent with the sphericity of the feedstock obtained by spray drying

and the surface is relatively smooth

with fewer defects

the particle size of the feedstock is about 60 μm

and the grain is nano structure.