TY - JOUR
T1 - Basic study on ultraprecision machining of single-crystal calcium fluoride
AU - Mizumoto, Y.
AU - Aoyama, T.
AU - Kakinuma, Y.
N1 - Funding Information:
This study was partially supported by Keio University Special Grant-in-Aid for Innovative Collaborative Research Project. Authors would like to express their sincere appreciation for the support.
PY - 2011
Y1 - 2011
N2 - Calcium fluoride (CaF2) has a wide range of change of refractive index and permeability of wavelength from vacuum ultraviolet range to infrared range so that it is utilized for lenses or prisms. CaF2 has been fabricated using conventionally grinding and polishing combined with interferometry and local surface correction to form the desired flat, sphere or aspherical surface. In this study, the mechanical properties and crack initiation on the (100), (110) and (111) planes of CaF2 are examined by nanoindentation and micro-Vickers hardness tests. In addition, brittle-ductile transition is investigated by performing an orthogonal cutting test with ultraprecision machine tool. The results of these tests show that the critical depth of cut remarkably changes on the basis of the crystal orientation on each plane. We have discussed these changes from the viewpoint of slip system and cleavage.
AB - Calcium fluoride (CaF2) has a wide range of change of refractive index and permeability of wavelength from vacuum ultraviolet range to infrared range so that it is utilized for lenses or prisms. CaF2 has been fabricated using conventionally grinding and polishing combined with interferometry and local surface correction to form the desired flat, sphere or aspherical surface. In this study, the mechanical properties and crack initiation on the (100), (110) and (111) planes of CaF2 are examined by nanoindentation and micro-Vickers hardness tests. In addition, brittle-ductile transition is investigated by performing an orthogonal cutting test with ultraprecision machine tool. The results of these tests show that the critical depth of cut remarkably changes on the basis of the crystal orientation on each plane. We have discussed these changes from the viewpoint of slip system and cleavage.
KW - Nanoindentation
KW - Ultra-precision machining
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U2 - 10.1016/j.proeng.2011.11.110
DO - 10.1016/j.proeng.2011.11.110
M3 - Conference article
AN - SCOPUS:83755177998
SN - 1877-7058
VL - 19
SP - 264
EP - 269
JO - Procedia Engineering
JF - Procedia Engineering
T2 - 1st CIRP Conference on Surface Integrity, CSI 2012
Y2 - 30 January 2012 through 1 February 2012
ER -