Cressington High Vacuum Turbo Carbon Coater 208c
Tiltable rotating stage and extended glass housing
Blunt and hand-milled carbon pieces
Carbon pieces mounted in carbon coater’s Bradley source
Uncoated sample and brass reference disk
Coated sample and brass reference disk (blue = 25 nm = 250 angstroms)
The goal for carbon coating of samples is to get a thickness of 25 nm (250 angstroms), which is recommended for EPMA at 15-20 keV. In general, thickness is estimated based on the color of the polished brass reference disk using the following correlations:
15 orange
20 redish purple
25 blue
30 bluish green
35 green blue
40 pale green
45 silver gold