Effects of shot-peening and atmospheric-pressure plasma on aesthetic improvement of Ti–Nb–Ta–Zr alloy for dental applications

Miura-Fujiwara, Eri; Suzuki, Yohei; Ito, Masako; Yamada, Motoko; Matsutake, Sinpei; Takashima, Seigo; Sato, Hisashi; Watanabe, Yoshihiko

doi:10.7567/jjap.57.01ag05

Cited by 4 publications

(5 citation statements)

References 30 publications

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“…formed oxide phase and its structure, but also the substrate/ oxide interface structure, the difference in the atomic volume between the substrate and the oxide, the difference in the thermal expansion coefficient, the layer thickness, and so on. 14,24) It is assumed that the increasing of the layer thickness with Nb addition might be one of the major reasons for the decrease in exfoliation stress with increasing Nb content above 20 mol%Nb. However, the abrupt increase in exfoliation stress from 18 mol%Nb to 20 mol%Nb cannot be explained by the present results.…”

Section: Effect Of Oxide Structure On Exfoliation Resistancementioning

confidence: 99%

Effect of Nb Addition on Oxide Formation on Ti–xNb Alloys

Ogawa

Miura-Fujiwara

2019

Mater. Trans.

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It had been reported that Ti29Nb13Ta4.6Zr (TNTZ) alloy forms a dense oxide layer by high-temperature oxidation whereas CP Ti forms a multilayered oxide consisted of rutile monolayers and void layer. This morphological change is supposed to be mainly caused by Nb addition in Ti since the dense oxide layer of TNTZ consists of multiple oxide phases, at least with rutile TiO 2 and TiNb 2 O 7 . In this study, hightemperature oxidation at 1273 K for 3.6 ks in the air of TixNb alloys (x = 1, 5, 7, 10, 13, 15, 18, 20, 23, 26, 28, 30 and 32 mol%) was investigated to discuss the effect of Nb addition to Ti on its high-oxidation behavior, and on its oxide microstructure. From the results of the SEM observation, an oxide layer with a void layer was formed on TixNb substrate from 1 mol%Nb up to 10 mol%Nb. However, densification of the oxide layer was confirmed at Ti13Nb. Then, the dense oxide layer was formed up to 32 mol%Nb. XRD results indicated that only rutile-type TiO 2 was identified from 1 mol%Nb up to 10 mol%Nb, then both TiO 2 and TiNb 2 O 7 were formed from 13 mol%Nb to 32 mol%Nb. These results indicate that dense oxide layer formation attributes to phase separation from TiO 2 to TiNb 2 O 7 . Until 10 mol%Nb, the thickness of oxide layer was suppressed by Nb addition, whereas the layer thickness increased with increasing Nb content from 13 mol%Nb. The maximum exfoliation resistance of the oxide layer was obtained at 20 mol%Nb. The results of oxide growth rate at each TixNb alloys suggested that Nb diffusion in Ti may rate-determining process of the dense oxide layer formation. [

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Section: Effect Of Oxide Structure On Exfoliation Resistancementioning

confidence: 99%

Effect of Nb Addition on Oxide Formation on Ti–xNb Alloys

Ogawa

Miura-Fujiwara

2019

Mater. Trans.

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“…[1][2][3][4][5][6][7][8] Because SP can cause large strain around the peened surface, microstructures around the peened surface are highly refined and the surface hardness is therefore considerably increased. [9][10][11][12][13][14] SP is therefore a surface severe plastic deformation (SPD) process, which can induce residual compressive stress.…”

Section: Introductionmentioning

confidence: 99%

“…This subsurface layer is generally referred to as a deformation‐induced layer (DIL) and has a fine structure. [ 10–14 ] Umemoto et al found that the DIL in the Fe–3.29 mass% Si after SP consists of nanocrystallized ferrite grains of size less than 20 nm [ 10 ] Sato et al reported that a DIL that consisted of fine grains was formed by SP of an Fe–33 mass% Ni alloy [ 11 ] and SUS304 austenitic stainless steel. [ 12 ] These Fe alloys contain both the austenite phase with face‐centered cubic (fcc) crystal structure and the martensite phase with body‐centered cubic (bcc) crystal structure.…”

Section: Introductionmentioning

confidence: 99%

Crystallographic Texture and Applications of Pure Cu Formed by Shot Peening

Sato

Ito

Kalita

et al. 2022

Physica Status Solidi (b)

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The crystallographic texture of pure Cu formed by shot peening (SP) and the texture formation process are investigated. When a pure Cu sheet with a β‐fiber texture is subjected to SP, grain refinement occurs and a deformation‐induced layer is formed around the peened surface. The crystal lattice is rotated and a {110} fiber texture, in which the ⟨110⟩ direction is parallel to the plane normal direction of the peened surface, is formed. The intensity of the {110} fiber texture increases with increasing SP duration. The {110} fiber texture is formed by uniaxial compression for face‐centered cubic metals. It is concluded that uniaxial compression is dominant in deformation by SP and a {110} fiber texture is therefore formed. Moreover, using shot‐peened (SPed) specimen with {110} fiber texture, a growth test of graphene is carried out. The SPed specimen is used as a substrate to grow the graphene by the chemical vapor deposition process. Growth of high‐quality graphene on the SPed specimen is obtained compared to unprocessed substrate surface. Therefore, control of the crystallographic texture by SP would be one of important tools for preparing Cu and other catalytic substrate surfaces for high‐quality graphene growth.

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“…Reducing processing time and temperature, and enhancing oxidation reaction only on the surface, will be an effective solution to this issue. 15) By the application of atmospheric-pressure plasma (APP) treatment, materials can be oxidized in a shorter time and at relatively lower temperature. [16][17][18] Therefore, APP treatment seems to have some advantages, compared to heat treatment, as an oxidation process of TNTZ wire to obtain a white oxide layer.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, they also found that shot-peening (SP) pretreatment before APP treatment obviously enhances the exfoliation resistance of the oxide layer. 15) SP is a treatment which can cause severe plastic deformation of the surface owing to the transferred high-collision energy from the injected hard powder, resulting in the introduction of residual compressive stress. 19,20) It is reported that surface nanocrystallization occurs in steel by SP.…”

Section: Introductionmentioning

confidence: 99%

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

Mitsuishi

Miura-Fujiwara²,

Yamada

et al. 2019

Jpn. J. Appl. Phys.

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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.

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Effects of shot-peening and atmospheric-pressure plasma on aesthetic improvement of Ti–Nb–Ta–Zr alloy for dental applications

Cited by 4 publications

References 30 publications

Effect of Nb Addition on Oxide Formation on Ti–xNb Alloys

Effect of Nb Addition on Oxide Formation on Ti–xNb Alloys

Crystallographic Texture and Applications of Pure Cu Formed by Shot Peening

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

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