2024-03-28T09:06:14Z
https://kitami-it.repo.nii.ac.jp/oai
oai:kitami-it.repo.nii.ac.jp:00006980
2022-12-13T02:25:06Z
1:87
Ulitaprecision Machining Characteristics of Poly-Crystalline Germanium
YAN, Jiwang
TAKAHASHI, Yasunori
TAMAKI, Jun-ichi
KUBO, Akihiro
KURIYAGAWA, Tsunemoto
SATO, Yutaka
Germanium is an excellent infrared optical material. 0n most occasions, singlecrystalline 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-crystanine 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.
journal article
日本機械学会
2006-01
application/pdf
JSME International Journal Series C
1
49
63
69
https://kitami-it.repo.nii.ac.jp/record/6980/files/4391.pdf
eng
Japan Society of Mechanical Engineers, J.Yan, Y.Takahashi, J.Tamaki, A.Kubo, T.Kuriyagawa, Y.Sato, JSME International Journal Series C, 49(1), 2006, 63-69.
open access