Deep nitriding—contact and bending strength of gears with increased nitriding hardening depth

Sitzmann, André; Hoja, S.; Schurer, S.; Tobie, Thomas; Stahl, Karsten

doi:10.1007/s10010-021-00502-w

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Plasma nitriding/carbonitriding can increase the surface strength of the material, improve its tensile and compressive abilities, and form a compound layer of nitride or carbonitride, which can significantly reduce wear and friction [33,45,[50][51][52]. In addition, the compound can be formed, improving the material's corrosion resistance and prolonging its service life [53][54][55].…”

Section: Solid Lubrication Layer Plasma Surface Preparation Technolog...mentioning

confidence: 99%

Solid Lubrication System and Its Plasma Surface Engineering: A Review

Li,

Zhou,

2023

Lubricants

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In aerospace, aviation, nuclear power, and other high-tech fields, some essential moving parts must operate under high vacuum, high load, intense radiation, and other conditions. Under such extreme conditions, only solid lubricating materials can meet the lubrication requirements. Traditional material modification methods have problems such as high energy consumption, severe pollution, and narrow scope of application. Plasma modification technology can overcome these shortcomings. This paper focuses on several commonly used plasma preparation techniques for solid lubricating coatings, including plasma chemical heat treatment, physical vapor deposition, plasma immersion ion implantation and deposition, plasma spraying, and plasma electrolytic oxidation. Subsequently, the material systems of metal-based solid lubrication coatings are reviewed: soft metals, oxides, sulfides, nitrides, and carbon-based materials. Finally, found that the development of new solid lubricants, the improvement of existing preparation technology, and the development of new processes are the key development directions in the future.

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Section: Solid Lubrication Layer Plasma Surface Preparation Technolog...mentioning

confidence: 99%

Solid Lubrication System and Its Plasma Surface Engineering: A Review

Li,

Zhou,

2023

Lubricants

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“…Therefore, despite the wide base of available research results, new research is necessary in order to improve the tooth profile design and upgrade the load capacity calculation procedures for different real working conditions. This task requires a refinement of the results of extensive theoretical and experimental research, as well as an implementation of new multidisciplinary research and disciplines, such as biomimetics design [1][2][3][4][5] and the design of new or improved materials [6][7][8][9][10]. Few research papers in which the authors used the basic biomimetics principles for the geometrical optimization of standard mechanical components could be found.…”

Section: Introductionmentioning

confidence: 99%

Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile

et al. 2023

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During the last few decades, the requirements for modern machine elements in terms of size reduction, increasing the energy efficiency, and a higher load capacity of standard and non-standard gears have been very prevalent issues. Within these demands, the main goals are the optimization of the gears’ tooth profiles, as well as the investigation of new tooth profile designs. The presented design idea is based on the optimal solutions inspired by nature. Special attention is paid to the new design of the tooth root zones of spur gears in order to decrease the stress concentration values and increase the tooth root fatigue resistance. The finite element method is used for stress and strain state calculations, and the particular gear pair is modeled and optimized for these purposes. For tooth root strength analysis, the estimations are based on the theory of critical distances and the stress gradients obtained through finite element analysis. The obtained stress gradients have shown important improvements in the stress distribution in the transition zone optimized by biomimetics. An analysis of the material variation influence is also performed. Based on the investigations of a particular gear pair, a significant stress reduction of about 7% for steel gears and about 10.3% for cast iron gears is obtained for tooth roots optimized by bio-inspired design.

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“…The results also show that a high flank load capacity of nitrided gears is given as long as the compound layer on the surface is intact. If the compound layer is damaged, the service life is limited by wear, micro-pitting and/or pitting [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Nitrided Layer Structure on the Micro-Pitting and Wear Behavior of Slow-Running Nitrided External Gears

et al. 2022

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Nitriding can significantly increase the load carrying properties of gears. While the diffusion layer is primarily responsible for improving the tooth root and flank load carrying capacity, the compound layer mainly determines the tribological properties of the gear surface. In the present work, the influence of the compound layer on the tribological load carrying capacity of nitrided gears in the N/N pairing was investigated. For this purpose, compound layers with different thickness, porosity and phase composition were produced and their micro-pitting and wear behavior were investigated in load stage and speed stage tests. The test results confirm that the properties of the compound layer are decisive for the micro-pitting and wear resistance of nitrided gears. For a high micro-pitting resistance, the presence of pores in the near-surface area of the compound layer is of high importance, since no micro-pitting occurred as long as pores were present. With regard to the wear behavior, no dependence on the compound layer thickness or the porous zone thickness was found while the phase composition of the compound layer shows a decisive influence.

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Deep nitriding—contact and bending strength of gears with increased nitriding hardening depth

Cited by 5 publications

References 5 publications

Solid Lubrication System and Its Plasma Surface Engineering: A Review

Solid Lubrication System and Its Plasma Surface Engineering: A Review

Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile

Influence of the Nitrided Layer Structure on the Micro-Pitting and Wear Behavior of Slow-Running Nitrided External Gears

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