Hardness of Alumina/Silicon Carbide Nanocomposites at Various Silicon Carbide Volume Percentages

Wade, James B.; Wu, Houzheng

doi:10.1002/9781118807828.ch11

Cited by 4 publications

(2 citation statements)

References 32 publications

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“…It is evident from Figure 7(a) that there is a steep rise in the HV value for the first step of loading from 0.98 to 1.98 N which is an impute of “Hardness as a function of Load.” During the next two consecutive steps of indentation loading, a small-scale decrease in the hardness values can be observed, which is attributed to the indentation size effect (ISE). 46 ISE is the decrease of hardness values with an increase in load and decrease in indentation depth. The hardness at higher loads of 4.90–9.8 N shows a cumulative elevation in apparent HV values, phenomenal to hardness load dependency.…”

Section: Resultsmentioning

confidence: 99%

Tribological behavior of chrome-deposited SAE9254 grade steel top compression piston ring under lubrication starvation and mild extreme pressure lubrication

Syed

Wàňi

2019

International Journal of Engine Research

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This article reports tribological studies of piston ring/cylinder liner tribo-contact to evaluate the scuffing failure under dry sliding conditions and its minimization with mild extreme pressure lubrication. The tribological conjugation tested employs a piston ring of SAE9254 grade steel substrate with plasma-sprayed chromium coating of 42 µm and ISO R185220 grade gray cast iron cylinder liner. A conformal, cylinder inscribed in cylindrical cavity contact was ensured to simulate actual dead center reciprocating between piston ring–cylinder liner interface. Tribotests were conducted under dry sliding, simulating lubrication starvation and sliding in extreme pressure additivation blend at a temperature of 200 °C with 10 mm stroke length and reciprocating velocity of 0.2 m s–1. The friction characteristics of the piston ring and cylinder liner samples in cited test conditions were studied as a function of load and continuously monitored throughout the tests. Optimal profilometry was employed for evaluating wear attributes. For surface morphology and allied surface characterization, energy-dispersive X-ray spectroscopy integrated scanning electron microscopy was used. For tribo-chemical interactions and film formation, the tribo-surfaces were further investigated with Raman spectroscopy. ASTM E-384 standard Vickers indentation microhardness and its precedence to tribological characteristics were evaluated. The extreme pressure lubrication is intended to potentially improve the scuffing résistance and optimization of coating material in achieving superior tribological characteristics. Superior lubricity, scuffing resistance and enhanced load-bearing capacity attributes were manifested by EP-PAO10 blend lubrication contrasting the surface deteriorations and scuffing failure ascribed to dry sliding.

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Section: Resultsmentioning

confidence: 99%

Tribological behavior of chrome-deposited SAE9254 grade steel top compression piston ring under lubrication starvation and mild extreme pressure lubrication

Syed

Wàňi

2019

International Journal of Engine Research

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“…Moreover, the weak interface between the reinforcement and Al 2 O 3 , the lubricating nature of some nanophases, such as CNTs and graphene, and agglomeration [30] may offset the influence of microstructure refinement [146,147,148] and the advantages of the SPS process. It is worth mentioning here the sensitivity of hardness to testing load [149] and residual internal stresses [150] that are caused by the thermal mismatch between alumina and the reinforcement.…”

Section: Spark Plasma Sintered Alumina Hybrid Nanocompositesmentioning

confidence: 99%

Recent Advances and Future Prospects in Spark Plasma Sintered Alumina Hybrid Nanocomposites

2019

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Although ceramics have many advantages when compared to metals in specific applications, they could be more widely applied if their low properties (fracture toughness, strength, and electrical and thermal conductivities) are improved. Reinforcing ceramics by two nano-phases that have different morphologies and/or properties, called the hybrid microstructure design, has been implemented to develop hybrid ceramic nanocomposites with tailored nanostructures, improved mechanical properties, and enhanced functionalities. The use of the novel spark plasma sintering (SPS) process allowed for the sintering of hybrid ceramic nanocomposite materials to maintain high relative density while also preserving the small grain size of the matrix. As a result, hybrid nanocomposite materials that have better mechanical and functional properties than those of either conventional composites or nanocomposites were produced. The development of hybrid ceramic nanocomposites is in its early stage and it is expected to continue attracting the interest of the scientific community. In the present paper, the progress made in the development of alumina hybrid nanocomposites, using spark plasma sintering, and their properties are reviewed. In addition, the current challenges and potential applications are highlighted. Finally, future prospects for developing alumina hybrid nanocomposites that have better performance are set.

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Hard and tough Al2O3-SiC-CNT hybrid ceramic nanocomposite produced by molecular level mixing and spark plasma sintering

Saheb

Mohammad

2017

J Aust Ceram Soc

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Hardness of Alumina/Silicon Carbide Nanocomposites at Various Silicon Carbide Volume Percentages

Cited by 4 publications

References 32 publications

Tribological behavior of chrome-deposited SAE9254 grade steel top compression piston ring under lubrication starvation and mild extreme pressure lubrication

Tribological behavior of chrome-deposited SAE9254 grade steel top compression piston ring under lubrication starvation and mild extreme pressure lubrication

Recent Advances and Future Prospects in Spark Plasma Sintered Alumina Hybrid Nanocomposites

Hard and tough Al2O3-SiC-CNT hybrid ceramic nanocomposite produced by molecular level mixing and spark plasma sintering

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