Resilient and Corrosion-proof Rolling Element Bearings Made from Superelastic Ni-Ti Alloys for Aerospace Mechanism Applications

DellaCorte, Christopher; Noebe, Ronald D.; Stanford, Malcolm K.; Padula, Santo

doi:10.1520/stp103887t

Cited by 27 publications

(25 citation statements)

References 8 publications

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“…The increased amount of Ni in NiTi composition plays a significant role in the phase transformation temperatures and shifts down the specific temperatures where austenitic NiTi is transformed to a martensitic one. In the specific case of 60NiTi, a very Ni-rich NiTi intermetallic containing ~60 wt.% (55 at.%) Ni and ~40 wt.% (45 at.%) Ti in its composition, the explained solutionizing and quenching procedure shifts down the phase transformation temperatures to well below room temperature (below −100 °C), making this alloy dimensionally stable for room temperature applications [ 1 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Ni-Rich 58NiTi and 60NiTi from Elementally Blended Ni and Ti Powders by a Laser Powder Bed Fusion Technique: Their Printing, Homogenization and Densification

Khanlari

Shi

et al. 2022

IJMS

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Compared to the equiatomic or near-equiatomic NiTinol alloys, Ni-rich NiTi alloys are suitable to be employed in structural applications as they exhibit higher hardness and are dimensionally stable. This research aimed to process two different grades of Ni-rich NiTi alloys, 58NiTi and 60NiTi, from Ni–Ti powder mixtures having about 58 wt.% and 60 wt.% Ni, respectively. This was performed by a laser powder bed fusion technique. At the first stage of this research, the printability of the used powder mixtures was investigated by applying different sets of printing parameters. Two appropriate sets were then selected to print the samples. Microstructural study of the printed parts revealed the existence of inhomogeneity in the microstructures. In addition, depending on the applied set of parameters, some amounts of cracks and pores were also present in the microstructure of these parts. Postprinting hot isostatic pressing procedures, performed at different temperatures, were developed to cause the reaction of phases, homogenize the parts, and possibly eliminate the existing flaws from the samples. Effects of these applied treatments on the microstructure, phase composition, density, dimensional integrity, and hardness of parts were sequentially studied. In essence, 58NiTi and 60NiTi parts having phase compositions complying with those of the equilibrium phase diagram were obtained in this research. However, the mentioned cracks and pores, formed in the microstructure of as-printed parts, could not be fully removed by postprocessing treatments.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Ni-Rich 58NiTi and 60NiTi from Elementally Blended Ni and Ti Powders by a Laser Powder Bed Fusion Technique: Their Printing, Homogenization and Densification

Khanlari

Shi

et al. 2022

IJMS

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“…60NiTi is nonmagnetic and has high hardness (can be hardened to 62 HRC) with elasticity twice that of steel, excellent corrosion resistance, tensile strength comparable to ceramics, and is 15% lighter than steel (Ingole, 2013). This combination of properties makes 60NiTi a potential alternative bearing material (DellaCorte et al, 2009(DellaCorte et al, , 2012. One application where 60NiTi is being considered for bearings is moving components in space vehicles, where the materials have to exhibit high hardness, moderate elastic modulus, and large recoverable strain to enable components to resist impact loads that occur during launch (DellaCorte et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…This combination of properties makes 60NiTi a potential alternative bearing material (DellaCorte et al, 2009(DellaCorte et al, , 2012. One application where 60NiTi is being considered for bearings is moving components in space vehicles, where the materials have to exhibit high hardness, moderate elastic modulus, and large recoverable strain to enable components to resist impact loads that occur during launch (DellaCorte et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Studies with fully formulated oils have also been performed. A spiral orbit tribometer was used to characterize multiplyalkylated cyclopentane (MAC) oil (DellaCorte et al, 2009(DellaCorte et al, , 2012Pepper et al, 2009Pepper et al, , 2010DellaCorte, 2010) and perfluorinated polyether (PFPE) oils (Pepper et al, 2009(Pepper et al, , 2010. The MAC oil (commercial name Pennzane 2001A) and PFPE oils (Krytox 143 AC and Castrol Brayco 815Z) are commonly used in space applications.…”

Section: Introductionmentioning

confidence: 99%

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Grease Lubrication of Self-Mated 60NiTi Bearing Materials

2019

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60NiTi is an intermetallic alloy of nickel and titanium that exhibits a unique combination of properties, including hardness comparable to steel, almost twice the elasticity of steel, high corrosion resistance, and tensile strength comparable to ceramics. These properties are very desirable for bearing materials, especially those used in space applications where components must operate efficiently and reliably in harsh conditions. However, despite the fact that most bearings are grease lubricated, there has not been a systematic study of the tribo-performance of greases for 60NiTi lubrication. To address this, we compare the wear and friction of self-mated 60NiTi lubricated by different greases, including those currently used in space missions and general-purpose grease, in low speed sliding contacts. The results provide valuable information to guide selection of grease for 60NiTi contacts as well as lay the groundwork for possible development of new greases specifically for 60NiTi tribo-contacts.

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“…An intermetallic nickel-titanium alloy, 60-NiTiNOL, composed of approximately 60 wt.% Ni and 40 wt.% Ti contains a broad combination of physical and mechanical properties such as high hardness, low elastic modulus, resistance to aqueous corrosion and good biocompatibility [1][2][3][4][5]. These unique combinations make this alloy an attractive candidate for medical components such as implants and prosthesis where hard and biocompatible materials with low stiffness are typically employed [4].…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Mechanical Properties of Porous 60NiTi Prepared by Conventional Press-and-sinter Method

et al. 2017

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Abstract. An intermetallic nickel-titanium alloy, 60NiTi, comprised of approximately 60 wt.% Ni and 40 wt.% Ti, contains a broad combination of physical and mechanical properties such as high hardness, low elastic modulus, resistance to aqueous corrosion and good biocompatibility. These unique combinations make this alloy an attractive candidate for medical components such as implants and prosthesis, where biocompatible materials with high hardness and low stiffness are typically used. The conventional press-and-sinter method which represents the least complex, most flexible and economic powder metallurgy method was used to produce porous 60NiTi parts suitable for biomedical applications. The effect of sintering holding time on the microstructure and mechanical properties is investigated. The structure of the as sintered parts is quite porous which is beneficial based on the medical point of view. The ultimate compressive strength of the samples is higher than that of the compact human bone and can, therefore, meet the strength demand of implants for general bone replacement applications.

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Resilient and Corrosion-proof Rolling Element Bearings Made from Superelastic Ni-Ti Alloys for Aerospace Mechanism Applications

Cited by 27 publications

References 8 publications

Fabrication of Ni-Rich 58NiTi and 60NiTi from Elementally Blended Ni and Ti Powders by a Laser Powder Bed Fusion Technique: Their Printing, Homogenization and Densification

Fabrication of Ni-Rich 58NiTi and 60NiTi from Elementally Blended Ni and Ti Powders by a Laser Powder Bed Fusion Technique: Their Printing, Homogenization and Densification

Grease Lubrication of Self-Mated 60NiTi Bearing Materials

Microstructural and Mechanical Properties of Porous 60NiTi Prepared by Conventional Press-and-sinter Method

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