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49 results on '"Miura-Fujiwara, Eri"'

1. Formation of Graded TiO 2 Layer on Ti Wire by Direct Alternating Current Discharge Plasma at Atmospheric Pressure.

Author

Watanabe, Yoshimi, Mitsuishi, Naho, Yamada, Motoko, Sato, Hisashi, Takashima, Seigo, and Miura-Fujiwara, Eri

Subjects
ATMOSPHERIC pressure plasmas, FUNCTIONALLY gradient materials, TITANIUM dioxide, TITANIUM oxides, PLASMA pressure
Abstract

Although metallic materials have been used as load-bearing materials in dental and biomedical fields since they have good mechanical properties such as good ductility and strength, their aesthetic properties are inferior to those of ceramic or resin. To obtain aesthetically improved Ti dental devices, the formation of white titanium oxide on pure Ti dental devices was studied. Direct atmospheric pressure plasma (APP) treatment using alternating current was carried out on pure a Ti plate and wire. It was found that a titanium oxide layer with enough whiteness can be obtained on pure Ti wire using direct APP treatment. Although delamination of the titanium oxide layer was found after a bending test, the concept of functionally graded materials (FGMs) can overcome the shortcoming. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Effect of Nb addition on high-temperature oxidation behavior, oxide layer structure, and its exfoliation resistance of Ti-Nb Alloys

Author

Miura-Fujiwara Eri, Ogawa Yuya, Niinomi Mitsuo, and Yamasaki Tohru

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

The authors proposed an oxide coating on Ti alloys for the dental abutment tooth, and they had reported that Ti–29Nb–13Ta–4.6Zr (TNTZ) alloy forms a dense oxide layer by high-temperature oxidation. On the other hand, CP Ti forms a multilayered oxide consisted of rutile monolayers and the void layer. This morphological change by alloying is supposed to be mainly caused by Nb addition in Ti since the dense oxide layer of TNTZ mainly consists of rutile TiO2 and TiNb2O7. Therefore, in this study, oxidation behaviors of various range of Nb content of Ti-xNb alloys (x = 1 ~ 32 mol%) were investigated, and exfoliation resistance was evaluated. And in this paper, the oxide/metal interfacial microstructure of oxidized CP Ti, TNTZ alloy, and Ti-Nb alloy was studied by a transmission electron microscopy (TEM) and by a scanning transmission electron microscopy with an electron dispersive spectroscopy (STEM-EDS). The cross-sectional observations suggested that the substrate was gradually oxidized during heat treatment, and nucleation and grain growth of TiO2 and TiNb2O7 proceed at the metal/oxide interface. Consequently, the gradual oxidation process in TNTZ and Ti-Nb alloys could lead to its continuous interfacial microstructure and dense oxide structure, which can achieve high exfoliation resistance.

Published
2020
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14. Application of atmospheric-pressure plasma treatment to coat Ti-alloy orthodontic wire with white oxide layer

Author

Mitsuishi, Naho, primary, Miura-Fujiwara, Eri, additional, Yamada, Motoko, additional, Chiba, Tadachika, additional, Sato, Hisashi, additional, Watanabe, Yoshimi, additional, Ito, Michiko, additional, Takashima, Seigo, additional, Nakai, Masaaki, additional, Akahori, Toshikazu, additional, Tanaka, Masaki, additional, Niinomi, Mitsuo, additional, and Takeuchi, Tsutomu, additional

Published
2019
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17. Application of atmospheric-pressure plasma treatment to coat Ti-alloy orthodontic wire with white oxide layer.

Author

Mitsuishi, Naho, Miura-Fujiwara, Eri, Yamada, Motoko, Chiba, Tadachika, Sato, Hisashi, Watanabe, Yoshimi, Ito, Michiko, Takashima, Seigo, Nakai, Masaaki, Akahori, Toshikazu, Tanaka, Masaki, Niinomi, Mitsuo, and Takeuchi, Tsutomu

Abstract

Ti-29Nb-13Ta-4.6Zr (TNTZ) is one of the Ti alloys used for orthodontic wire. However, there is a problem that the metallic color of TNTZ may spoil the appearance of a row of teeth. In previous studies, white oxide coating on disk-shaped TNTZ samples was obtained by heat treatment or atmospheric-pressure plasma (APP) treatment. In this study, the fabrication process of white orthodontic wire by applying APP treatment is proposed. As a result, TNTZ wire which has a white oxide layer with comparable brightness to the surface of Japanese teeth has been successfully fabricated. [ABSTRACT FROM AUTHOR]

Published
2021
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49. Fabrication of Al-Al3Ti/Ti3Al Functionally Graded Materials under a Centrifugal Force.

Author

El-Hadad, Shimaa, Sato, Hisashi, Miura-Fujiwara, Eri, and Watanabe, Yoshimi

Subjects
CENTRIFUGAL force, NANOPARTICLES, HYDROPHOBIC surfaces, TEMPERATURE control, MORPHOLOGY
Abstract

Fabrication of Al-Al3Ti functionally graded materials (FGMs) under the centrifugal force has recently attracted some attention. The controlled compositional gradient of the fabricated FGMs, the low cost of the process, and the good mold filling, are the main advantages of the centrifugal method (CM). Using the conventional CM techniques such as the centrifugal solid-particle method and centrifugal in-situ method, FGMs rings with gradually distributed properties could be achieved. As a more practical choice, the centrifugal mixed-powder method (CMPM) was recently proposed to obtain FGMs containing nano-particles selectively dispersed in the outer surface of the fabricated parts. However, if a control of the particles morphology, compound formulas or sizes, is desired, another CM technique is favored. As a development of CMPM, our novel reaction centrifugal mixed-powder method (RCMPM) has been presented. Using RCMPM, Al-Al3Ti/Ti3Al FGMs with good surface properties and temperature controlled compositional gradient could be achieved. In this short review, this novel method will be discussed in detail and the effect of RCMPM processing temperature on the reinforcement particles morphology, size and distribution through the fabricated samples, will be reviewed. [ABSTRACT FROM AUTHOR]

Published
2010
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