Authors: Ning Yang WenJun Zong ZengQiang Li Tao Sun
Publish Date: 2014/11/01
Volume: 77, Issue: 5-8, Pages: 1029-1034
Abstract
In mechanical lapping diamond exhibits a highly anisotropic tribological behavior The dependency of wear rate on crystal orientation has long been noticed by diamond polishers However in the diamond manufacturing the surface quality is another side in need of attention In this paper the relationship between surface morphology and crystallographic orientation under a certain lapping condition was examined It is found that a fine surface can still be obtained at the directions that deviate a lot from the “soft” directions near 001 crystal direction for 110 surface But with respect to the “hard” directions near 110 crystal direction for 110 surface a bad surface finish with a fracture appears This result comes down to two aspects First on 110 surface as the lapping direction from the 001 soft direction approaches 110 hard direction the phase change of diamond carbon atoms gets more difficult which causes the depth of the amorphization layer becomes thinner Second the energy required by diamond amorphization is lower than that by surface fracture around the soft direction while near the hard direction the contrary is the case Our work provides a further understanding of the diamond tribological properties
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