Study on aluminum alloy bearings containing hard particles.

Fukuoka, Tatsuhiko; Kamiya, Soji; Soda, Norimume

doi:10.1299/kikaic.53.1232

Cited by 5 publications

(3 citation statements)

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“…Initially, it was observed that aluminum adhered to the worn surface of the steel in the base oil. This finding implies two important conclusions: Si grains alone are insufficient to remove the adhered aluminum, which contradicts previous studies [18,19], and the additives contained in the engine oil play a role in inhibiting aluminum adhesion in mode II. Subsequently, aluminum adhered to the steel ball surface in the case of the Mo+Ca oil, where no tribofilm was detected.…”

Section: Effect Of Additive Combination On Friction Reduction Of Sili...contrasting

confidence: 70%

“…Previous studies have shown that hard silicon grains contribute to low friction owing to the following two reasons: (1) the silicon grains protrude from the aluminum matrix owing to the larger wear amount of the matrix, and this protrusion allows the grains to support normal loads while preventing direct contact between the aluminum matrix and the counterpart [17], and (2) the hard silicon grains polish and remove the adhered aluminum on the counterpart [18,19]. In the context of point (1), hard silicon grains also provide high local contact pressure, which promotes the tribochemical reactions of additives [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Running-in for Low Friction between Silicon-Containing Aluminum Alloy and Bearing Steel in Engine Oil

Ihara

Adachi

2023

Tribology Online

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The friction properties of an aluminum-silicon alloy (Al-Si) can be improved by increasing its silicon content. However, this can deteriorate the material properties necessary for engine components. Therefore, an alternative approach to reduce friction is required. This study investigated the running-in behavior, the reduction of friction from the initial to the stable phase of sliding, between Al-Si with varying silicon contents and bearing steel in fully formulated engine oil. The friction of Al-Si and the silicon-free aluminum alloy (Al) was classified into three modes: no friction reduction (mode I), friction reduction after a high-friction period (mode II), and immediate friction reduction (mode III). Al exhibited only mode I, low-silicon-content Al-Si mainly displayed mode II, and high-siliconcontent Al-Si mainly exhibited mode III. Energy-dispersive X-ray spectroscopy revealed that, for mode II, zinc dithiophosphate (ZnDTP) reacted with the aluminum matrix, suppressing aluminum adhesion and forming molybdenum-dithiocarbamate-derived tribofilm. Nanoindentation and micro-Vickers tests demonstrated that the initial high hardness of the Al-Si matrix did not increase the ZnDTP reactions. However, the friction-induced hardened layer on the matrix promoted the ZnDTP reactions, suggesting that forming the hardened layer is a key factor in the low-friction interface of Al-Si without increasing silicon content.

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Section: Effect Of Additive Combination On Friction Reduction Of Sili...contrasting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Running-in for Low Friction between Silicon-Containing Aluminum Alloy and Bearing Steel in Engine Oil

Ihara

Adachi

2023

Tribology Online

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“…They are perhaps more appropriately called aluminum-lead-silicon bearings because the presence o f fine silicon particles in the alloy plays very significant roles in its good tribological performance, e.g., wear resistance, fatigue strength and compatibility. Fukuoka et al (3), ( 4 ) experimentally investigated the efthan those with plate-like Si particles because plate-like particles can be crushed by the shaft ( 6 ) . In SAE 787 bearing alloy there is about 4% silicon by weight and it disperses in the alloy in fine block-form particles.…”

Section: Introductionmentioning

confidence: 99%

Seizure Resistance of Aluminum-Lead-Silicon Connecting Rod Bearings and Nodular Cast Iron Shafts

Cheng

1996

Tribology Transactions

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Seizure failure of aluminum-lead-silicon crankshaft bearings andfects o f hard particles in aluminum based bearing alloys by r~odular cast iron shafts has been studied experimentally. Bearings introducing different hard particles into 10% tin-aluminum and shafts of diferent materials with diferent surface texture have alloys. Their results showed that hard particles in the alloy b e a tested and compared. Results show that seizure can occur on can polish and modify the shaft surface, and remove alumimime, local scales, Larger silicon particles in the num adhesion on the shaft. Ferrite burrs on thc shart surFace can be polished away so that the bearing has a much higher alloy give better seizure resistance. Bored bearings have higher seizure seizure load, especially when nodular cast iron sharts are loads than broached bearings. Fmemte in cast iron decreases the seizure used. Hard particles also enhance the wear resistance OF the resistance of the shaft. Surjnce quality of the shaft also has an apbearing. They also found that the harder the particles are, parmt gect On 'Ite seizure limit. are proposed lo the better effects they can achieve, with hardest silicon parseizure behaviors and mechanisms. ticles having the best performance ( 5 ) . The aluminum alloys with block-form Si particles showed better seizure resistance KEY WORD Bearings

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Study on the microstructure and wear behavior of Mg-containing Al–12Sn–4Si alloys

Wang¹,

Wu²,

Gao³

et al. 2022

Journal of Materials Research and Technology

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Study on aluminum alloy bearings containing hard particles.

Cited by 5 publications

References 0 publications

Running-in for Low Friction between Silicon-Containing Aluminum Alloy and Bearing Steel in Engine Oil

Running-in for Low Friction between Silicon-Containing Aluminum Alloy and Bearing Steel in Engine Oil

Seizure Resistance of Aluminum-Lead-Silicon Connecting Rod Bearings and Nodular Cast Iron Shafts

Study on the microstructure and wear behavior of Mg-containing Al–12Sn–4Si alloys

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