Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 18, Pages 16178-16184Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.08.194
Keywords
Sapphire substrates; Subsurface damage; Material removal mechanism; Mechanical planarization machining
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Funding
- National Natural Science Foundation of China [U1305241, 51475175]
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The mechanical planarization machining of sapphire substrates including the C- (0001), A- (1120), and M(1010) orientations with the sol-gel (SG) polishing pad has been performed in this paper. The polishing results show that the C-orientation with a surface roughness about 2 nm is smoother than the A- and M-orientations, and the material removal rate (MRR) of C -orientation is higher than that of them. The removal mechanism of sapphire substrate was investigated by the wear debris and subsurface structure through transmission electron microscopy (TEM). And the instrumented nanomechanical tests were applied to further reveal the removal mechanism by nanoindentation. The analysis results indicate that the variation tendency of MRRs depends on the crystalline structure and nanomechanical properties of sapphire substrates. In addition, the processing of sapphire substrates is mainly dominated by the mechanical removal sapphire material during mechanical planarization machining.
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