Basic study on ultraprecision machining of single-crystal calcium fluoride

Y. Mizumoto, T. Aoyama, Y. Kakinuma

Research output: Contribution to journalConference articlepeer-review

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)264-269
Number of pages6
JournalProcedia Engineering
Volume19
DOIs
Publication statusPublished - 2011
Event1st CIRP Conference on Surface Integrity, CSI 2012 - Bremen, Germany
Duration: 2012 Jan 302012 Feb 1

Keywords

  • Nanoindentation
  • Ultra-precision machining

ASJC Scopus subject areas

  • Engineering(all)

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