Ultraprecision machining characteristics of poly-crystalline germanium

Jiwang Yan, Yasunori Takahashi, Jun'ichi Tamaki, Akihiko Kubo, Tsunemoto Kuriyagawa, Yutaka Sato

研究成果: Article査読

23 被引用数 (Scopus)


Germanium is an excellent infrared optical material. On most occasions, single-crystalline germanium is used as optical lens substrate because its homogeneous structure is beneficial for fabricating uniform optical surfaces. In this work, we attempt to use poly crystals as lens substrates instead of single crystals, which may lead to a significant reduction in production cost. We conducted ultraprecision cutting experiments on poly-crystalline germanium to examine the microscopic machinability. The crystal orientations of specific crystal grains were characterized, and the machining characteristics of these crystal grains including surface textures, cutting forces, and grain boundary steps were investigated under various machining conditions. It was possible to produce uniformly ductile-cut surfaces cross all crystal grains by using an extremely small undeformed chip thickness (∼80nm) under negative tool rake angles (∼ -45°). This work indicates the possibility of fabricating high-quality infrared optical components from poly-crystalline germanium.

ジャーナルJSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing
出版ステータスPublished - 2006 9 15

ASJC Scopus subject areas

  • 機械工学
  • 産業および生産工学


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