In:
Review of Scientific Instruments, AIP Publishing, Vol. 74, No. 1 ( 2003-01-01), p. 160-163
Abstract:
An ultracentrifuge apparatus, which can generate an ultra-strong gravitational field even & gt;1 000 000 (1 million) G (1 G=9.8 m/s2) over a wide temperature range up to & gt;500 °C with high stability control, was developed for new materials science research. The system consists of an air turbine motor with ceramic ball bearings and dumper section, a sample rotor with an outer diameter of up to 160 mm, a vacuum chamber, and a heating system. The nonbored rotor and the double-structural dumper bushing are used to raise the maximum rotational speed and to improve the stability. The samples can be heated by radiant heat. A maximum rotational speed of 190 000 rpm using a 70 mm diam rotor was recorded despite a short time where the maximum gravitational field was & gt;1 2000 000 G. Long and high-temperature ultracentrifuge experiments using 70 and 80 mm diam rotors made of titanium alloy with rotational speeds of up to 170 000 rpm even at temperatures of over 200 °C for 100 h with ripples of & lt;0.05% and & lt;1°, respectively, were successfully performed, where the maximum gravitational field of the sample was & gt;1 000 000 G. The potential energy and sample volume were increased by factors of & gt;2 and & gt;4, respectively, compared with those in the Kumamoto University study [T. Mashimo, S. Okazaki, and S. Tashiro, Rev. Sci. Instrum. 67, 3170 (1996)].
Type of Medium:
Online Resource
ISSN:
0034-6748
,
1089-7623
Language:
English
Publisher:
AIP Publishing
Publication Date:
2003
detail.hit.zdb_id:
209865-9
detail.hit.zdb_id:
1472905-2
SSG:
11
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