2000 Fiscal Year Final Research Report Summary
The development of mechanical spectroscopy for extreamlly low frequency and very high temperature and the application for the ceramics
| Project/Area Number |
11650696
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | OSAKA UNIVERSITY |
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Principal Investigator |
OTA Ken'ichi ISIR, OSAKA UNIVERSITY Research Associate, 産業科学研究所, 助手 (10150351)
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| Project Period (FY) |
1999 – 2000
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| Keywords | mecanical spectroscopy / internal friction / ceramics / grain boundary / almina / silicon nitride / silicon carbide / high temperature |
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| Research Abstract |
Torsion pendulum was applied to the mechanical spectroscopy for extremely low frequency and very high temperatures. torsion stress was applied by the magnetic force using by the magnet placed on the torsion bar. Hermholtz type magnet was used in the system, because the stress is independent for the strain. Sin wave signal, which generated by the phase analyzer, was amplified for the current of magnet coil. The eddy current type displacement sensor placed by the torsion bar detected the strain of the specimen. The sensitivity of the detector is less than 1/6000 radian. The stress and strain signal was analyzed by the frequency response analyzer (NF5090), and then the phase angle was calculated within the error of 1/6000 radian. This system is affected by the atmospheric noise ; the insulator can control the noise. For the measuring up to very high temperature, I used the carbon furnace, which is used for high temperature internal friction measurement. Thermal shield for protection of magnets and the sensor was set around the furnace. This system is applied for the measurement of high temperature mechanical spectroscopy of the ceramics. The variable information from the grain boundary was obtained by using newly developed mechanical spectroscopy.
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