Rapid Nitriding of Titanium Alloy with Fine Grains at Room Temperature

Fujita, Kazuhiko; Ijiri, Masataka; Inoue, Yoichi; Kikuchi, Shoichi

doi:10.1002/adma.202008298

Cited by 18 publications

(8 citation statements)

References 19 publications

(35 reference statements)

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“…The raw material used in the current study was a CP titanium powder (25.6 µm particle diameter) with 0.122% O, 0.008% N, 0.005% H, 0.037% Fe, and 0.003% C (on a mass basis), with the remainder consisting of Ti. 31) Figure 1 illustrates the process used to form the CP titanium, which had a heterogeneous nitrogen diffusion phase, and two types of specimens fabricated by gas nitriding and spark plasma sintering (SPS). Gas nitriding was conducted at 823 K or 873 K for 18 ks to produce a nitrided layer on the CP titanium powder particle surfaces (see Figs.…”

Section: Materials and Specimensmentioning

confidence: 99%

Effect of a Heterogeneous Nitrogen Diffusion Phase on Four-Point Bending Fatigue Properties in Commercially Pure Titanium

et al. 2022

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The purpose of this study is to develop commercially pure (CP) titanium having a higher fatigue strength than titanium alloys developed via heterogeneous nitrogen diffusion. The microstructure of CP titanium having a heterogeneous nitrogen diffusion phase, which was fabricated by consolidating gas-nitrided powders, was characterized, and its fatigue properties were examined. The nitrogen content and hardness of CP titanium compacts having a heterogeneous nitrogen diffusion phase increased with increasing powder gas nitriding temperature and sintering temperature. The fatigue limit and fatigue life of CP titanium compacts increased with increasing sintering temperature and with decreasing powder gas-nitriding temperature. In particular, CP titanium having a heterogeneous nitrogen diffusion phase that is fabricated by hightemperature sintering of powders treated with low-temperature nitriding has a higher fatigue limit than un-nitrided bulk Ti6Al4V alloy. The fatigue limit of CP titanium can be controlled by optimizing the powder gas nitriding and sintering temperatures.

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Section: Materials and Specimensmentioning

confidence: 99%

Effect of a Heterogeneous Nitrogen Diffusion Phase on Four-Point Bending Fatigue Properties in Commercially Pure Titanium

et al. 2022

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“…Surface nitriding is an effective method to improve the tribological properties and corrosion resistance of Ti alloys due to the fact that nitrided layers exhibit high hardness, good thermal and chemical stability, and high wear resistance [15,16]. In the field of biomaterials, researchers have found that nitrided layers intrinsically or deliberately formed on the surface of biomaterials showed antibacterial properties.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Bacteriostatic Properties of Ti Alloys by Surface Nitriding

Rajaseka

Katsaros

et al. 2023

Biomedical Materials & Devices

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Surface nitriding has been widely used to improve the surface physicochemical properties of Ti alloys. However, the currently utilized surface nitriding methods, such as laser nitriding, typically require expensive and complicated instruments, which makes surface nitriding a less cost-effective process. Meanwhile, the antibacterial properties of surface-nitrided Ti alloy implants have not been evaluated. Thereafter, in this study, we were aiming to develop an effective, simple, and cost-effective surface nitriding strategy to enhance the antimicrobial properties of Ti alloy implants. The surface nitriding strategy was realized by wet-chemical etching and thermal treatment at controlled conditions. Results showed that the above surface modification treatments exerted significant effects on the phase composition and morphology of the newly formed phases on the surface of Ti samples. Crystalline TiN and TiO2 formed after treatments. Meanwhile, amorphous nitrides and oxynitride were also presented on the sample surfaces. The surface-modified Ti samples showed a bacterial inhibition effect compared with the non-treated Ti ones, and the bacterial inhibition effect was attributed to the released ammonia species from the surface of Ti samples. The surface modification strategy shows promise to improve the bacteriostatic property of Ti implants in dental and orthopedic fields.

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“…Titanium would easily react with oxygen in the air and then form loose and porous TiO 2 , which could exacerbate the oxidation of the alloy. Therefore, researchers have used various surface treatment techniques, including electroplating [ 4 ], chemical heat treatment [ 5 , 6 , 7 ], ion implantation [ 8 , 9 ], mechanical surface enhancement technology [ 10 , 11 ], and vapor deposition [ 12 , 13 ], to improve the properties of the surface to meet the application requirements.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano Nd2O3 on the Microstructure and High-Temperature Resistance of G@Ni Laser Alloying Coatings on Ti-6Al-4V Alloy

Wang

Meng

Zhao³

et al. 2023

Nanomaterials

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Titanium and its alloys are widely used in high-end manufacturing fields. However, their low high-temperature oxidation resistance has limited their further application. Recently, laser alloying processing has attracted researchers to improve the surface properties of Ti, for which Ni coated graphite system is an excellent prospect due to its outstanding properties and metallurgical bonding between coating and substrate. In this paper, nanoscaled rare earth oxide Nd2O3 addition was added to Ni coated graphite laser alloying materials to research its influence on the microstructure and high-temperature oxidation resistance of the coating. The results proved that nano-Nd2O3 has an outstanding effect on refining coating microstructures, thus the high-temperature oxidation resistance was improved. Furthermore, with the addition of 1. 5 wt.% nano-Nd2O3, more NiO formed in the oxide film, which effectively strengthened the protective effect of the film. After 100 h of 800 °C oxidation, the oxidation weight gain per unit area of the normal coating was 14.571 mg/cm2, while that of the coating with nano-Nd2O3 addition was 6.244 mg/cm2, further proving that the addition of nano-Nd2O3 substantially improved the high-temperature oxidation properties of the coating.

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Rapid Nitriding of Titanium Alloy with Fine Grains at Room Temperature

Abstract: Ti-6Al-4V substrate because of the impact of the particles. Thus, we found that the proposed process could form a nitrided layer on Ti alloys in air at room temperature.

Cited by 18 publications

References 19 publications

Effect of a Heterogeneous Nitrogen Diffusion Phase on Four-Point Bending Fatigue Properties in Commercially Pure Titanium

Effect of a Heterogeneous Nitrogen Diffusion Phase on Four-Point Bending Fatigue Properties in Commercially Pure Titanium

Enhanced Bacteriostatic Properties of Ti Alloys by Surface Nitriding

Effect of Nano Nd2O3 on the Microstructure and High-Temperature Resistance of G@Ni Laser Alloying Coatings on Ti-6Al-4V Alloy

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