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Your search keyword '"Masayuki Ichiyanagi"' showing total 4 results
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4 results on '"Masayuki Ichiyanagi"'

1. Study of the Effect of Gasoline Components on Lubricity

Author

Nitiwat Chiampradit, Takashi Nomura, Masayuki Ichiyanagi, and Yasumitsu Isobe

Subjects
Motor vehicles. Aeronautics. Astronautics, TL1-4050
Abstract

Due to each country’s energy policy, various types of gasoline such as ethanol blended gasoline, high/low aromatic content gasoline, etc. are sold in the market. As the production of engines and their part supply chains become more globalized, it is important to develop engines that can be compatible with various types of gasoline. To maintain engine durability, it is necessary to clarify the effects of these gasoline components on engine durability. To understand the friction of metal to metal contact, which are directly connected to engine durability, we examined synthetically the relationship between gasoline components and lubricity.

Published
2017
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3. Anelastic Behavior of Hydroxyapatite Ceramic

Author

Masakuni Ozawa, Suguru Suzuki, and Masayuki Ichiyanagi

Subjects
Materials science, Mechanical Engineering, Fluorapatite, Torsion (mechanics), Modulus, Atmospheric temperature range, Hydroxylapatite, Condensed Matter Physics, Apatite, chemistry.chemical_compound, chemistry, Mechanics of Materials, visual_art, Dynamic modulus, visual_art.visual_art_medium, General Materials Science, Ceramic, Composite material
Abstract

The relationship between anelastic property and chemical species (F, OH) in calcium-containing apatite structure was investigated by the dynamic elastic technique. The internal friction and dynamic modulus of two apatite-type ceramics of hydroxylapatite (HAP) and fluoroapatite (FAP) were measured by using a forced torsion apparatus. The internal friction (IF) amplitude of about 0.01 was observed for HAP in the temperature range of -50 to 100°C. However, no IF appeared for FAP, in which hydroxyl-group was replaced by fluorine. The modulus of HAP showed the decrease corresponding to the IF amplitude. The author discussed that the dynamic relaxation of hydroxyl-group was evolved with the anelastic phenomenon of the apatite-structured material.

Published
2011

4. Internal friction of hydroxyapatite and fluorapatite

Author

Masahiro Sakamura, Masayuki Ichiyanagi, Masakuni Ozawa, and Suguru Suzuki

Subjects
Materials science, Torsional vibration, Calcium fluorophosphate, Process Chemistry and Technology, Fluorapatite, Mineralogy, Atmospheric temperature range, Internal friction, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry.chemical_compound, chemistry, D apatite, Materials Chemistry, Ceramics and Composites, Calcium hydroxyphosphate, Composite material
Abstract

Internal friction was measured by a forced torsional vibration method at 0.1–10 Hz in the temperature range of −100 to 400 °C on both hydroxyapatite (HAp) sintered at 1300 °C for 3 h under fluent H 2 O vapor and fluorapatite (FAp) sintered at 1200 °C for 3 h in the F 2 atmosphere. Three peaks of internal friction appeared at approximately −40, 80 and 130 °C for HAp. However, for the FAp, no internal friction peak was obtained in the measured temperature range. It is considered that the difference of F − and OH − positions in each FAp and HAp structure greatly influences internal friction.

Published
2004

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