Product Announcement from Saint-Gobain Surface Conditioning Group
Saint-Gobain's Lapping Vehicle, 79372189F, for the sapphire market is used with B4C or SiC grain. This is a lapping vehicle which suspends either boron carbide, B4C or silicon carbide, SiC abrasive particles in a slurry for the lapping of C plane sapphire wafers used principally in the fabrication of LED (light emitting diode) devices. The sapphire wafers have to be lapped flat and extremely smooth without surface defects.
The final polishing process produces an epi-ready surface -- an almost atomically perfect surface which allows the deposition of GaN, Gallium Nitride, the material at the heart of the blue/white laser diode. We also offer a polishing slurry, 92400.20MIC12 Polycrystalline Alumina Slurry for this application.