Ultraprecision machining characteristics of poly-crystalline germanium

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

Research output: Contribution to journalArticle

18 Citations (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 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.

Original languageEnglish
Pages (from-to)63-69
Number of pages7
JournalJSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing
Volume49
Issue number1
DOIs
Publication statusPublished - 2006 Sep 15
Externally publishedYes

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 crystal
  • Ultraprecision machining

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Mechanical Engineering

Cite this

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

In: JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing, Vol. 49, No. 1, 15.09.2006, p. 63-69.

Research output: Contribution to journalArticle

Yan, Jiwang ; Takahashi, Yasunori ; Tamaki, Jun'ichi ; Kubo, Akihiko ; Kuriyagawa, Tsunemoto ; Sato, Yutaka. / Ultraprecision machining characteristics of poly-crystalline germanium. In: JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing. 2006 ; Vol. 49, No. 1. pp. 63-69.
@article{f841b71c344a4d8cab28f5bf45e52ccc,
title = "Ultraprecision machining characteristics of poly-crystalline germanium",
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 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.",
keywords = "Diamond turning, Ductile regime machining, Germanium, Optical surface, Poly crystal, Ultraprecision machining",
author = "Jiwang Yan and Yasunori Takahashi and Jun'ichi Tamaki and Akihiko Kubo and Tsunemoto Kuriyagawa and Yutaka Sato",
year = "2006",
month = "9",
day = "15",
doi = "10.1299/jsmec.49.63",
language = "English",
volume = "49",
pages = "63--69",
journal = "JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing",
issn = "1344-7653",
publisher = "Japan Society of Mechanical Engineers",
number = "1",

}

TY - JOUR

T1 - Ultraprecision machining characteristics of poly-crystalline germanium

AU - Yan, Jiwang

AU - Takahashi, Yasunori

AU - Tamaki, Jun'ichi

AU - Kubo, Akihiko

AU - Kuriyagawa, Tsunemoto

AU - Sato, Yutaka

PY - 2006/9/15

Y1 - 2006/9/15

N2 - 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.

AB - 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.

KW - Diamond turning

KW - Ductile regime machining

KW - Germanium

KW - Optical surface

KW - Poly crystal

KW - Ultraprecision machining

UR - http://www.scopus.com/inward/record.url?scp=33748879341&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33748879341&partnerID=8YFLogxK

U2 - 10.1299/jsmec.49.63

DO - 10.1299/jsmec.49.63

M3 - Article

AN - SCOPUS:33748879341

VL - 49

SP - 63

EP - 69

JO - JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing

JF - JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing

SN - 1344-7653

IS - 1

ER -