Challenges in Plasma Spraying of 8%Y2O3-ZrO2 Thermal Barrier Coatings on Al Alloy Automotive Piston and Influence of Vibration and Thermal Fatigue on Coating Characteristics

Reghu, V. R.; Shankar, Vijai Shankar Bhavani; Ramaswamy, Parvati

doi:10.1016/j.matpr.2018.10.185

Cited by 13 publications

(3 citation statements)

References 2 publications

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“…We observed a significant but overall modest metabolic activity reduction in keratinocytes cultured directly on the gas plasma-treated composite surface. Gas plasma is an enabling technology for surface modifications in many industries [ 15 , 16 , 17 ]. Hence, such modifications might account for the reduction in metabolic activity.…”

Section: Discussionmentioning

confidence: 99%

Biological Risk Assessment of Three Dental Composite Materials following Gas Plasma Exposure

et al. 2022

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Gas plasma is an approved technology that generates a plethora of reactive oxygen species, which are actively applied for chronic wound healing. Its particular antimicrobial action has spurred interest in other medical fields, such as periodontitis in dentistry. Recent work has indicated the possibility of performing gas plasma-mediated biofilm removal on teeth. Teeth frequently contain restoration materials for filling cavities, e.g., resin-based composites. However, it is unknown if such materials are altered upon gas plasma exposure. To this end, we generated a new in-house workflow for three commonly used resin-based composites following gas plasma treatment and incubated the material with human HaCaT keratinocytes in vitro. Cytotoxicity was investigated by metabolic activity analysis, flow cytometry, and quantitative high-content fluorescence imaging. The inflammatory consequences were assessed using quantitative analysis of 13 different chemokines and cytokines in the culture supernatants. Hydrogen peroxide served as the control condition. A modest but significant cytotoxic effect was observed in the metabolic activity and viability after plasma treatment for all three composites. This was only partially treatment time-dependent and the composites alone affected the cells to some extent, as evident by differential secretion profiles of VEGF, for example. Gas plasma composite modification markedly elevated the secretion of IL6, IL8, IL18, and CCL2, with the latter showing the highest correlation with treatment time (Pearson’s r > 0.95). Cell culture media incubated with gas plasma-treated composite chips and added to cells thereafter could not replicate the effects, pointing to the potential that surface modifications elicited the findings. In conclusion, our data suggest that gas plasma treatment modifies composite material surfaces to a certain extent, leading to measurable but overall modest biological effects.

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Section: Discussionmentioning

confidence: 99%

Biological Risk Assessment of Three Dental Composite Materials following Gas Plasma Exposure

et al. 2022

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“…It is added to Y 2 O 3 to ZrO 2 , sintered into zirconia ceramics at low temperature, and then zirconia ceramic was applied to metal cutters and wear parts to form a coating with high strength and toughness. Reghu et al [70] applied an Y 2 O 3 /ZrO 2 thermal barrier coating to automotive pistons using plasma spray for wear and tear caused by vibration and thermal fatigue. They performed thermal shock cycles and random vibration tests on the research pistons, and analyzed the cross-section metallographic materials through SEM.…”

Section: Metal/ceramic Nano-coating Materialsmentioning

confidence: 99%

Technical Characteristics and Wear-Resistant Mechanism of Nano Coatings: A Review

et al. 2020

Coatings

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Nano-coating has been a hot issue in recent years. It has good volume effect and surface effect, and can effectively improve the mechanical properties, corrosion resistance and wear resistance of the coatings. It is important to improve the wear resistance of the material surface. The successful preparation of nano-coatings directly affects the application of nano-coatings. Firstly, the preparation methods of conventional surface coatings such as chemical vapor deposition and physical vapor deposition, as well as the newly developed surface coating preparation methods such as sol-gel method, laser cladding and thermal spraying are reviewed in detail. The preparation principle, advantages and disadvantages and the application of each preparation method in nano-coating are analyzed and summarized. Secondly, the types of nano-coating materials are summarized and analyzed by inorganic/inorganic nanomaterial coatings and organic/inorganic nanomaterial coatings, and their research progress is summarized. Finally, the wear-resistant mechanism of nano-coatings is revealed from three aspects: grain refinement, phase transformation toughening mechanism and nano-effects. The application prospects of nano-coatings and the development potential combined with 3D technology are prospected.

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“…For example, when sitting in the car and start the engine, one can feel certain vibration levels more or less. The source of such vibration is a physics movement of the piston (Geng & Chen, 2005;Liu & Randall, 2005;Moosavian et al, 2016Moosavian et al, , 2017Reghu et al, 2018;Wu et al, 2019) and crankshafts (Fung & Chen, 1998;Karkoub, 2000;Veciana Fontanet et al, 2021) of the vehicle's motor. Anyone see that the forcing load repeats in a sinusoidal repetition for each cylinder.…”

Section: Introductionmentioning

confidence: 99%

Forced Frequency Response Analysis of a Gudgeon Pin

Gulsevincler

2022

EJOSAT

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In this study, forced frequency response analysis was applied on the gudgeon pin. Ansys Mechanical 19.2 program was used to analyze the vibration on the gudgeon pin. Once completed in the finite element analysis, a note from the modal results, the model's natural frequencies range from 38721 to 79346 Hertz for the first 12 modes. According to the modal analysis results, the gudgeon pin will not be subjected to resonance during working. Therefore, a frequency scan including modal analysis is required to detect resonant frequencies that may coincide with the natural frequencies of the first 12 modes obtained in modal analysis. Consequently, harmonic analysis has been solved using the mode superposition method with 50 intervals with 1000 Hz steps in the range of 30000-80000 Hz. To dampen the resonant frequencies, harmonic analyzes were repeated using six different constant damping ratios, and the results were compared.

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Challenges in Plasma Spraying of 8%Y2O3-ZrO2 Thermal Barrier Coatings on Al Alloy Automotive Piston and Influence of Vibration and Thermal Fatigue on Coating Characteristics

Cited by 13 publications

References 2 publications

Biological Risk Assessment of Three Dental Composite Materials following Gas Plasma Exposure

Biological Risk Assessment of Three Dental Composite Materials following Gas Plasma Exposure

Technical Characteristics and Wear-Resistant Mechanism of Nano Coatings: A Review

Forced Frequency Response Analysis of a Gudgeon Pin

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