Tribological Characteristics of Polyol Ester Type Refrigeration Oils under Refrigerants Atmosphere

Tada, Akira; Okido, Takeshi; Shono, Yohei; Takahashi, Hajime; Shitara, Yuji; Tanaka, Shinji

doi:10.2474/trol.11.348

Cited by 9 publications

(10 citation statements)

References 3 publications

(1 reference statement)

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“…A block-on-ring tribometer was used [75] to study the tribological characteristics of POE refrigeration oils under HFC-410A and HFC-32 refrigerants. The study concluded that lubricating film formation is affected by both the refrigerants and the base oils.…”

Section: Hydrofluorocarbons (Hfcs)mentioning

confidence: 99%

A Historical Review on the Tribological Performance of Refrigerants used in Compressors

Bhutta¹,

Khan²,

Garland³

et al. 2018

Tribol. Ind.

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Refrigerants directly affect the tribological performance of interacting components in a compressor. Since the introduction of artificially formulated refrigerants, the types of refrigerants used in compressors have changed over the years. Apart from evaluating the physical, chemical and thermodynamic properties of refrigerants, the refrigerants have also been studied from a view point of tribology by various researchers worldwide. Changing a refrigerant in a compressor not only has an effect on the thermodynamic cycle but also effects the lubricants viscosity, lubricants pressure-viscosity coefficient, oil film thickness, lubricant/refrigerant miscibility, friction, wear, durability, reliability and overall power consumption. Refrigerants have been studied from a view point of tribology by varying the contact geometries, by using different lubricating oils with and without additives, by altering the environmental pressure/temperature, by changing the phase of the refrigerant, by using different interacting materials and by applying numerous surface treatments. The tribological behavior of refrigerants can be better understood by consolidating the findings in a comprehensive manner. An indepth review on the tribological behavior of refrigerants is missing from the literature. This article reviews the tribological studies carried out on refrigerants, with focus on refrigerants used in domestic appliances, automobile air-conditioning systems and small scale industrial and commercial applications.

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Section: Hydrofluorocarbons (Hfcs)mentioning

confidence: 99%

A Historical Review on the Tribological Performance of Refrigerants used in Compressors

Bhutta¹,

Khan²,

Garland³

et al. 2018

Tribol. Ind.

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Section: Simulationsmentioning

confidence: 99%

“…Further investigations of the tribochemical adsorption and reactions of model gases on iron surfaces were performed by molecular simulations . An atomistic simulator powered by deep learning, MATLANTIS was applied to calculate the stabilized energy by adsorption of model compounds to a clean iron surface.…”

Section: Simulationsmentioning

confidence: 99%

“…Because iron fluoride has been detected in friction tracks by XPS analysis after lubrication tests under an HFO atmosphere, the HFO must react with the iron surface during the lubrication tests under HFO gas. 57 To investigate the chemical affinity between refrigerant gases and iron surfaces during lubrication, the adsorption of the gases on nascent iron surface was performed using the method described above. Propylene and R1234-yf both have double bonds (π-electrons) and show high adsorption activity; however, saturated hydrocarbons tended not to adsorb on nascent iron surfaces, as shown in Figure 6.…”

Section: ■ Simulationsmentioning

confidence: 99%

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Chemical Activity of Nascent Surfaces for Tribochemical Reactions of Lubricant Components

Mori,

Nanao,

Takiwatari

2024

Langmuir

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Boundary lubrication characteristics are strongly dependent on tribochemical reactions at the contact interface. There are multiple factors that contribute to the activity of tribochemical reactions and the complexity of this phenomenon. Here, we focused on nascent surfaces created by friction and aimed to clarify their chemical properties. To achieve this, we first developed a method based on a mass spectrometer that can sensitively detect molecular adsorption and reactions on a nascent surface. We used various organic compounds as adsorbates and friction materials such as steel, aluminum, gold, and ceramics and examined adsorption of the organic compounds on the nascent surfaces. The adsorption properties of the additives differed between steel metal oxide and nascent steel surfaces. For example, polar organic phosphates, which are extreme-pressure additives, were more easily adsorbed on oxide surfaces, whereas nonpolar organic sulfur compounds were more easily adsorbed on nascent steel surfaces. Alcohols and ethers also adsorbed on nascent aluminum surfaces, whereas olefins and benzene did not. Nascent gold surfaces showed high catalytic activity. Saturated hydrocarbons and fluorinated compounds, which are chemically inert, were also adsorbed on nascent ceramic surfaces, showing high activity. Hydrocarbon oils decomposed through the influence of frictional heat on a nascent steel surface to generate hydrogen and methane. We applied reactive molecular dynamics to simulate the adsorption phenomenon on iron surfaces. As a result, the adsorption energy obtained by simulation and the experimentally determined adsorption activity correlated well. Thus, adsorption and reaction behaviors on nascent surfaces inferred by our method were theoretically supported. On the basis of the chemical properties of the nascent surfaces obtained here, it is possible to explain boundary lubrication phenomena.

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“…Research into the potential use of low toxic polyol ester (POE) as drilling mud lubricants has not been given a great attention [3], despite their high performance and biodegradability in general lubricant application [5,6]. Firstly, the oxidation and thermal stability of this type of lubricant has been improved by replacing glycerol with alcohol that does not contain ß-hydrogen atoms [7].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Polyol Esters from Palm Oil as a Lubricant for Bentonite Suspension Drilling Fluid

et al. 2017

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This study evaluated the potential use of three polyol esters (POEs) derived from palm oil as a lubricant in bentonite suspension drilling fluid. Three different POEs were investigated, which are pentaerythritol ester (PEE), trimethylolpropane ester (TMPE), and neopentylglycol ester (NPGE). It was revealed that POEs reduced the coefficient of friction (COF) in bentonite suspension by more than 80%. However, TMPE and NPGE undesirably caused foaming and altered the gel texture of the suspension. PEE showed the best performance as it produced the highest lubricity and the lowest effect on the suspension texture. The decrease of COF might increase the drilling efficiency and prevent the lubricity-related drilling problems. The findings of this investigation will be used for future applications of POE from palm oil in wider mud formulation.

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Tribological Characteristics of Polyol Ester Type Refrigeration Oils under Refrigerants Atmosphere

Cited by 9 publications

References 3 publications

A Historical Review on the Tribological Performance of Refrigerants used in Compressors

A Historical Review on the Tribological Performance of Refrigerants used in Compressors

Chemical Activity of Nascent Surfaces for Tribochemical Reactions of Lubricant Components

Performance Evaluation of Polyol Esters from Palm Oil as a Lubricant for Bentonite Suspension Drilling Fluid

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