Patent ID: 6368410
Filing Date: 2002-04-09
Classification: C03C,C23C

Abstract:
A semiconductor processing article comprising a quartz body having a surface that has a surface-roughness comprising a first surface-roughness component and a second surface-roughness component; said first surface-roughness component being represented by a first average deviation from a first mean surface; said second surface-roughness component being represented by a second average deviation from a second mean surface and being superimposed on said first surface-roughness component; said first average deviation being from about 2.5 microns to about 50 microns, and said second average deviation being from about 0.25 micron to about 5 microns; said first mean surface being defined over a distance of about 500 microns along said surface, and said second mean surface being defined over a distance of about 50 microns along said surface; and said surface further having rounded trenches resulting from a chemical attack at cracks in said surface by a chemical etchant.