Ultraprecision machining characteristics of poly-crystalline germanium

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

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 undefonned chip thickness (∼80 nm) under high negative tool rake angles (∼-45°). This work indicates the possibility of fabricating high-quality infrared optical components from poly-crystalline germanium.

Original languageEnglish
Title of host publicationLEM 2005 - 3rd International Conference on Leading Edge Manufacturing in 21st Century
Pages1035-1040
Number of pages6
Publication statusPublished - 2005
Externally publishedYes
Event3rd International Conference on Leading Edge Manufacturing in 21st Century, LEM 2005 - Nagoya, Japan
Duration: 2005 Oct 192005 Oct 22

Other

Other3rd International Conference on Leading Edge Manufacturing in 21st Century, LEM 2005
CountryJapan
CityNagoya
Period05/10/1905/10/22

Fingerprint

Germanium
Machining
Crystalline materials
Crystals
Lenses
Infrared radiation
Machinability
Optical materials
Substrates
Crystal orientation
Grain boundaries
Textures
Single crystals
Costs
Experiments

Keywords

  • Diamond turning
  • Ductile regime machining
  • Germanium
  • Optical surface
  • Poly crystalline
  • Ultraprecision machining

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering

Cite this

Yan, J., Takahashi, Y., Tamaki, J., Kubo, A., Kuriyagawa, T., & Sato, Y. (2005). Ultraprecision machining characteristics of poly-crystalline germanium. In LEM 2005 - 3rd International Conference on Leading Edge Manufacturing in 21st Century (pp. 1035-1040)

Ultraprecision machining characteristics of poly-crystalline germanium. / Yan, Jiwang; Takahashi, Yasunori; Tamaki, Jun'ichi; Kubo, Akihiko; Kuriyagawa, Tsimemoto; Sato, Yutaka.

LEM 2005 - 3rd International Conference on Leading Edge Manufacturing in 21st Century. 2005. p. 1035-1040.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Yan, J, Takahashi, Y, Tamaki, J, Kubo, A, Kuriyagawa, T & Sato, Y 2005, Ultraprecision machining characteristics of poly-crystalline germanium. in LEM 2005 - 3rd International Conference on Leading Edge Manufacturing in 21st Century. pp. 1035-1040, 3rd International Conference on Leading Edge Manufacturing in 21st Century, LEM 2005, Nagoya, Japan, 05/10/19.
Yan J, Takahashi Y, Tamaki J, Kubo A, Kuriyagawa T, Sato Y. Ultraprecision machining characteristics of poly-crystalline germanium. In LEM 2005 - 3rd International Conference on Leading Edge Manufacturing in 21st Century. 2005. p. 1035-1040
Yan, Jiwang ; Takahashi, Yasunori ; Tamaki, Jun'ichi ; Kubo, Akihiko ; Kuriyagawa, Tsimemoto ; Sato, Yutaka. / Ultraprecision machining characteristics of poly-crystalline germanium. LEM 2005 - 3rd International Conference on Leading Edge Manufacturing in 21st Century. 2005. pp. 1035-1040
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