The surface of the sample presents mesh-like holes, which are the PI components on the surface of the matrix being eroded by AO, and the residues are fillers that act as antigenic oxygen components.
The surface of the sample presents a mesh hole, which is the PI component of the surface of the substation that is peeled off by AO, and the residue is a filler that acts as an anti-atomic oxygen component.
The surface of the sample shows reticular pores, which is the PI component of the surface layer of the matrix is eroded by AO, and the residue is the filler of anti atomic oxygen component<br>