Friction and wear behaviour of hard and superhard coatings at cryogenic temperatures

Ostrovskaya, Ye.L; Strel’nitskij, V.E.; Kuleba, V. I.; Gamulya, G.D.

doi:10.1016/s0301-679x(01)00009-3

Cited by 19 publications

(8 citation statements)

References 25 publications

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“…Though, it is not the case for all sliding pairs and is highly dependent on the sliding pair's coating and substrate materials (Ostrovskaya et al 2001). -Tayeb et al (2009) developed an apparatus to study the effect of spraying LN 2 into the sliding zone on the CoF between tungsten carbide wheel and two types of titanium pins made of Ti-5Al-4V-0.6Mo-0.4Fe (Ti54) and Ti-6Al-4V (Ti64).…”

Section: Tribological Behaviour Of Materials At Cryogenic Temperaturesmentioning

confidence: 99%

State-of-the-art cryogenic machining and processing

Shokrani

Dhokia

Muñoz‐Escalona³

et al. 2013

International Journal of Computer Integrated Manufacturing

180

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This paper is a state-of-the-art review of the use of cryogenic cooling using liquefied gases in machining. The review is classified into two major categories namely, cryogenic processing and cryogenic machining. In cryogenic processing also known as cryo-processing the cutting tool material is subjected to cryogenic temperatures as a part of its heat treatment process. The majority of the reported studies identify that cryo-processing can considerably increase cutting tool life especially for high speed steel tools. It also identified that in cryogenic machining a cryogen is used as a cooling substance during cutting operations. The cryogen can be used to freeze the workpiece material and/or cutting tool. The paper concludes that cryogenic cooling has demonstrated significant improvements in machinability by changing the material properties of the cutting tool and/or workpiece material at the cutting zone, altering the coefficient of friction and reducing the cutting temperature.

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Section: Tribological Behaviour Of Materials At Cryogenic Temperaturesmentioning

confidence: 99%

State-of-the-art cryogenic machining and processing

Shokrani

Dhokia

Muñoz‐Escalona³

et al. 2013

International Journal of Computer Integrated Manufacturing

180

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“…The friction of hydrogen-free coatings is much higher, but they show only minimum wear. Some a-c:Hand ta-C-coatings are suitable for cryogenic applications, but, compared with room temperature, the a-c:H variants show higher friction and a shorter lifetime (Gradt et al 2001;Ostrovskaya et al 2001). …”

Section: Diamond-like Carbon Coatingsmentioning

confidence: 99%

Coatings for Biomedical Applications

Hauert¹,

Falub²,

Thorwarth³

et al. 2013

Encyclopedia of Tribology

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DefinitionCapillary force and surface wettability are related phenomena happening at the interfaces of solid, liquid, and air phases, and are highly dependent upon the interaction between liquids and solid surfaces. Scientific Fundamental Surface WettabilityWhen a liquid is in contact with a solid surface in air, in general, a droplet of the liquid will be formed. The shape of the droplet depends upon the interaction between the liquid and the solid surface. If the interaction is strong, i.e., the liquid "likes" the surface, the liquid drop will be "flat." On the contrary, if the interaction is weak, i.e., the liquid "hates" the surface, it will "bead up." Scientifically, such a property is described quantitatively by the concept of contact angle, which demonstrates the angle (y) at which the air-liquid and solid-liquid interfaces meet (see Fig. 1). Such a situation is the result of the force balance at the location where air, liquid, and solid phase meet, the socalled "three phase contact line." The interfacial tension of air-liquid, air-solid, and liquid-solid interface is denoted by g al , g as , and g ls , respectively. The force balance is described by the well-known Young's equation (Blake 1993; Butt et al. 2003; Isrealachvili 2003):This is a clear description of the interaction between the solid and liquid, as a smaller value of contact angle exhibits a larger difference between g as and g ls and, therefore, a much lower interfacial tension between the solid and liquid.The contact angle measurement is also an informative way to show the surface wettability of a liquid on a solid surface. If the interaction between the liquid and the solid surface is strong, a much lower interfacial energy results, and, as a result, the surface will be covered more by the liquid so that more area with higher air-solid interfacial energy is replaced by much lower interfacial energy of the liquid and solid. The result is that the liquid droplet is more spread out and has a lower value of contact angle. On the other hand, an unfavorable interaction between the liquid and solid surface generates a higher interfacial energy and, therefore, the system will maximize the area of the solid-air interface and minimize that of the interface between the liquid and solid surface. Consequently, the liquid forms a droplet with a small footprint on the surface and has a higher value of contact angle.

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“…As a representative of 2D materials, MoS 2 has already been used as one of the most widespread lubricants in mechanical engineering. , MoS 2 is capable of exhibiting superlow friction, which is based on its unique layered structure, weak interlaminar interaction, and excellent surface nature, under specific working conditions such as those of aerospace, automobile engines, and precision bearings. , It is worth noting that these application fields require special lubrication methods to resist harsh conditions. For instance, under low-temperature or high-vacuum environments, the lubrication and dynamic seal of bearings are urgent issues, , which sets strict requirements of material composition, interfacial structure, and lubricity robustness for the lubricants. However, these harsh environments are beneficial for the layered MoS 2 to exhibit its intrinsic lubricity through preventing the structure from decomposition by moisture in a humid environment.…”

Section: Introductionmentioning

confidence: 99%

A New Pathway for Superlubricity in a Multilayered MoS₂–Ag Film under Cryogenic Environment

et al. 2021

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A fundamental cryogenic study in tribology from 20 to 300 K revealed that a kind of disulfide film could exhibit a superlubricity state. Inspired by this, we designed a more delicate experiment and reported an extremely low friction coefficient for a multilayered MoS 2 −Ag film in a cryogenic environment against a bare steel ball under a high load. The results showed that the multilayered MoS 2 −Ag film could undergo a pressure exceeding 2 GPa to maintain a superlow friction coefficient of below 0.001 at 170 K. The film material was transferred to the sliding contacts to form an antifriction tribofilm. The superlubricity mechanism was attributed to the formation of MoS 2 -wrapped Ag nanoparticles accumulated at the sliding interface through nanoparticle movement and layered-structure sliding. This new kind of multilayered MoS 2 −Ag film provides a novel design for a solid lubricant and broadens the application of solid lubrication films under harsh working conditions for mechanical engineering.

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Friction and wear behaviour of hard and superhard coatings at cryogenic temperatures

Cited by 19 publications

References 25 publications

State-of-the-art cryogenic machining and processing

State-of-the-art cryogenic machining and processing

Coatings for Biomedical Applications

A New Pathway for Superlubricity in a Multilayered MoS₂–Ag Film under Cryogenic Environment

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Friction and wear behaviour of hard and superhard coatings at cryogenic temperatures

Cited by 19 publications

References 25 publications

State-of-the-art cryogenic machining and processing

State-of-the-art cryogenic machining and processing

Coatings for Biomedical Applications

A New Pathway for Superlubricity in a Multilayered MoS2–Ag Film under Cryogenic Environment

Contact Info

Product

Resources

About

A New Pathway for Superlubricity in a Multilayered MoS₂–Ag Film under Cryogenic Environment