Effects of Composition and Surface Finish of Silicon Nitride Tappet Inserts on Valvetrain Friction

Gangopadhyay, A.; Watt, Douglas Mc; Willermet, P. A.; Crosbie, Gary M.; Allor, R. L.

doi:10.1016/s0167-8922(99)80083-2

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…Better engine combustion efficiency provided by a turbocharged direct injection system, motor-driven power steering, and a selective controlled engine with an idle stop and go system can reduce the peak power of engine and frictional loss [4,5]. Therefore, several studies have been conducted to substitute conventional steel and cast irons with lightweight metals [6e9].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and thermal properties of nanocarbon-reinforced aluminum matrix composites at elevated temperatures

Shin

Bae

2016

Composites Part B: Engineering

140

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Section: Introductionmentioning

confidence: 99%

“…Among the applications, the driving condition of an engine's piston is most affected by severe environmental factors, such as high combustion pressure and temperature [6,10]. Therefore, materials that are used in engines should have high strength and low thermal expansion at high temperatures [4,5].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and thermal properties of nanocarbon-reinforced aluminum matrix composites at elevated temperatures

Shin

Bae

2016

Composites Part B: Engineering

140

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“…Once the MoS 2 layer is formed, friction is controlled by that layer and the surface finish becomes less important. Chemical analysis of the insert surface can be found elsewhere [19]. The effects of isotropic finish and AHC coating on friction torque in the presence of oils A and B are shown in Fig.…”

Section: Friction Datamentioning

confidence: 99%

Valvetrain friction and wear: Influence of surface engineering and lubricants

Gangopadhyay

Soltis

Johnson

2004

Proceedings of the Institution of Mechanical Engineers, Part J:

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Customer demand and legislative pressure are continually challenging automotive manufacturers to improve the fuel economy of their vehicles. Several technologies are currently being evaluated to meet this challenge. Tribology can play a significant role in bringing some of these technologies to a more mature state and can also make enhancements to existing technologies to reduce frictional losses in the powertrain. Although the valvetrain contributes only 6-10 per cent of the total frictional loss in an engine, all opportunities are explored to reduce frictional losses further, provided they are cost effective. This paper describes attempts to reduce frictional losses in directacting mechanical bucket tappet type valvetrains through surface finish, surface texture and coatings. It was observed that surface finish and surface texture could reduce frictional losses, but engine oil formulation also plays a significant role. Improvements were observed with non-friction-modified oils, but with friction-modified oils the overall friction was lower but no additional friction benefit could be observed with surface finish or surface texture. This paper also addresses wear concern associated with implementation of proposed GF-4 low-phosphorus engine oils. The wear was measured by a radiotracer technique. It was observed that, if the engine oils are formulated properly, low-phosphorus engine oils provide similar or better wear protection compared with GF-3 oils containing 0.1 per cent phosphorus.

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“…Hence aluminum alloys are being fabricated with the addition of various elements like carbon nanotubes and other nano-sized particles so as to enhance the properties of metal matrix to meet the specific applications [8]. One of the major applications is automobile sector wherein the engine piston should be designed with materials of high strength and low thermal expansion to withstand the high combustion pressure and temperature [9][10][11]. Thermogravimetric analysis, (TGA) is a technique used to monitor the mass of any substance subjected to increment/decrement in temperature.…”

mentioning

confidence: 99%

Experimental Investigation of Thermal Stability of Carbon Nanotubes Reinforced Aluminium Matrix using TGA-DSC Analysis

Rao¹,

Tjprc²

2018

IJMPERD

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Metal matrix composites are grabbing more attention by researchers due to their outstanding properties which meet the requirements of a specific application. This paper deals with the experimental investigations done to examine the thermal stability of Matrix under various thermal applications and also to study the effect of MWCNT content and particle size on thermal properties of the Al-CNT metal matrix. Different characterization techniques such as Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry analysis (DSC) were performed for the Aluminium-CNT metal matrix. Thermal gravimetric analysis revealed that maximum weight loss is found to be 0.44% for 1.5 wt % of CNT (type2) in Aluminium which is less compared to the weight loss of pure Aluminium. Hence a minimum of 0.24% weight loss was found for 1.0 weight % of CNT (type 2) in Aluminium. Differential Scanning Calorimetry analysis revealed that rate of heat flow increase gradually with the increase in outer diameter of selected carbon nanotubes and maximum heat flow of 106.6 mW for 1.5 wt% of CNT (type3) in Aluminium which was 40% greater than that of pure Aluminium. Thus TGA-DSC tests help in investigating the thermal stability of selected Al-CNT metal matrix.

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Effects of Composition and Surface Finish of Silicon Nitride Tappet Inserts on Valvetrain Friction

Cited by 7 publications

References 4 publications

Mechanical and thermal properties of nanocarbon-reinforced aluminum matrix composites at elevated temperatures

Mechanical and thermal properties of nanocarbon-reinforced aluminum matrix composites at elevated temperatures

Valvetrain friction and wear: Influence of surface engineering and lubricants

Experimental Investigation of Thermal Stability of Carbon Nanotubes Reinforced Aluminium Matrix using TGA-DSC Analysis

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