Patent ID: 7026009

Claim:
A method of selecting a component for a substrate processing chamber that processes a substrate in a plasma of an RF or microwave energized gas for deposition or etch processing, the method comprising: (a) providing a structure having a textured coating having surface grains; and (b) evaluating the resistance of the textured coating on the structure to erosion by the energized gas used in processing the substrate, by: (i) directing a beam of electrons onto the surface grains of the textured coating thereby causing at least some of the electrons to be backscattered, (ii) detecting the backscattered electrons and generating a signal image, (iii) evaluating the signal image to determine the size of the surface grains of the textured coating, and (iv) selecting the component when the surface grains of the textured coating are sized from about 0.1 to about 5 micron.