Nanostructured CVD Tungsten Carbide Coating on Aircraft Actuators and Gearbox Shafts Reduces Oil Leakage and Improves Durability

Zhuk, Yuri

doi:10.1007/s11665-019-03936-0

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…It is porosity free and is an excellent alternative to HCP. According to a recent study [13], it outperforms HCP by 14 times, demonstrating excellent wear resistance. They also go as far as to refer to it as 'seal friendly', as it is qualified by Airbus as 'an environmentally friendly replacement for HCP'.…”

Section: Materials 21 Sleevementioning

confidence: 99%

“…The surface roughness of the sleeve is key in achieving proper lubrication at the interface, preventing the seal from running dry. Lubricant-free seal contact with the asperities also increases shear loads, friction and raises local seal surface temperature leading to thermal degradation [13]. Owing to the fact that the surface roughness is determined by the coating and coating method, the coating becomes an invaluable parameter in controlling increased temperatures at the sealing interface.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Study of Contact Temperatures at Sealing Interface against Varying Shaft Surfaces

et al. 2021

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Increased temperatures at the sealing interface between the seal and shaft can reduce the working life of a seal through elastomer aging, swelling and increased friction. Degradation of the seal due to increased temperatures can cause pre-mature failure, wear and leakage. There is no such thing as a perfect seal; each application has requirements to cater to the needs of each system. For radial oil seals in helicopter gearboxes, the contact temperatures at the sealing interface are a critical parameter to consider. In this manuscript, investigating the factors that influence the temperatures at the contact interface shed light on the operating parameters that cause an increase in contact temperatures. Four varying shaft coatings are tested against three seal spring loads for a range of sliding velocities between 5–25 ms−1 to reproduce conditions of the gearbox. The study reveals an optimum seal spring of 12 oz, with a circumferential load of 3.34 N for lowest temperatures at the interface. Higher springs of 14 oz and lower springs of 8.5 oz both cause increased temperatures at the interface. Additionally, the need for surface coatings on the shaft is re-enforced through experimental evidence demonstrated by comparing temperatures reached between a plain stainless steel shaft and three surface coated shafts. Chrome plating shafts are undesirable due to the ‘polishing’ in effect they experience. The results of this study build on this by showing that chrome plated shafts have higher temperatures at the interface, aggravating any wear or polishing in of that surface. Contact temperatures with Tungsten carbide and Chrome oxide coatings remain within the expected temperature rise. Lastly, microscopically ‘rougher’ surfaces result in increased temperatures in contrast to surface coatings within the specified range of roughness as provided by DIN 3760/61/ISO 6194.

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Section: Materials 21 Sleevementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Contact Temperatures at Sealing Interface against Varying Shaft Surfaces

et al. 2021

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“…Nanomaterials also have potential applications in the corrosion resistance and fatigue resistance of aviation materials. Zhuk also discovered that extend the service life of aircraft parts by improving the nanostructure of the material, which can enhance its ability to resist corrosion and reduce fatigue damage [10].…”

Section: Nanomaterials In Aviationmentioning

confidence: 99%

Overview of aerospace materials and their applications

Xia

2023

TNS

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Aerospace materials play a crucial role in modern aerospace technology. This paper is mainly a comprehensive overview of aerospace materials, including their classification, properties and applications. Aerospace materials are used in a wide range of applications, including aircraft and spacecraft, propulsion systems, and electronics. The paper also summarizes the importance and diversity of aerospace materials in various applications. The classification of aerospace materials includes metal materials, composite materials, ceramic materials and nanomaterials. Each material has unique properties that make it suitable for different applications. Aerospace materials are used in a wide range of applications, including aircraft and spacecraft, propulsion systems, and electronic devices. Materials for aircraft and spacecraft are particularly demanding because they are subjected to extreme temperatures, pressures and vibrations. Materials for propulsion systems and electronics require properties such as high strength, high electrical conductivity and high corrosion resistance. This paper also summarizes the importance and diversity of aerospace materials in various applications. Through the reading of this article, readers will understand the key role of aerospace materials in modern aerospace technology.

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“…In [ 101 ], it was proposed to apply a nanostructured tungsten carbide coating deposited with CVD on metal elements in contact with seals in order to minimize possible leaks, among others in actuators. Such a coating allows obtaining high resistance to abrasion and corrosion and general protection of surface roughness parameters of the substrate.…”

Section: Materials and Surface Modifications Used For Hydraulic Acmentioning

confidence: 99%

Overview of Materials Used for the Basic Elements of Hydraulic Actuators and Sealing Systems and Their Surfaces Modification Methods

2021

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The article is an overview of various materials used in power hydraulics for basic hydraulic actuators components such as cylinders, cylinder caps, pistons, piston rods, glands, and sealing systems. The aim of this review is to systematize the state of the art in the field of materials and surface modification methods used in the production of actuators. The paper discusses the requirements for the elements of actuators and analyzes the existing literature in terms of appearing failures and damages. The most frequently applied materials used in power hydraulics are described, and various surface modifications of the discussed elements, which are aimed at improving the operating parameters of actuators, are presented. The most frequently used materials for actuators elements are iron alloys. However, due to rising ecological requirements, there is a tendency to looking for modern replacements to obtain the same or even better mechanical or tribological parameters. Sealing systems are manufactured mainly from thermoplastic or elastomeric polymers, which are characterized by low friction and ensure the best possible interaction of seals with the cooperating element. In the field of surface modification, among others, the issue of chromium plating of piston rods has been discussed, which, due, to the toxicity of hexavalent chromium, should be replaced by other methods of improving surface properties.

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Nanostructured CVD Tungsten Carbide Coating on Aircraft Actuators and Gearbox Shafts Reduces Oil Leakage and Improves Durability

Cited by 5 publications

References 13 publications

An Experimental Study of Contact Temperatures at Sealing Interface against Varying Shaft Surfaces

An Experimental Study of Contact Temperatures at Sealing Interface against Varying Shaft Surfaces

Overview of aerospace materials and their applications

Overview of Materials Used for the Basic Elements of Hydraulic Actuators and Sealing Systems and Their Surfaces Modification Methods

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