Running-in behaviour of thermal barrier coatings in the combustion chamber of a diesel engine

Thibblin, Anders; Kianzad, Siamak; Jönsson, Stefan; Olofsson, Ulf

doi:10.1177/0954407019841173

Cited by 7 publications

(2 citation statements)

References 47 publications

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“…In order to find the emissivity of these coatings the samples were considered opaque, however many ceramics are partially transparent, transmitting considerable amounts of radiation to the bond coat and substrate. 28,29 The reliability of the measurements is based on the use of the same bond coat and substrate along with the different samples, with this if the results will reflect the differences in between the different top coats.…”

Section: R +mentioning

confidence: 99%

“…26,27 The samples utilized in this measurement were limited to the same substrate and bond coat, this is of extreme importance because many ceramic materials are partially transparent to thermal radiation. 28,29 With this, if this coating was detached or a different bond coat was applied the comparison of the optical property within the different samples could be compromised.…”

Section: R +mentioning

confidence: 99%

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Porous thermal barrier coatings for enhancing the efficiency of internal combustion engines

Goes

Gupta

Markocsan

et al. 2022

International Journal of Engine Research

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Internal combustion engines have a key role in the social and economic advancement of modern society but also a significant contribution to greenhouse gas emissions. For these engines, to preserve their role, a higher efficiency, that dramatically reduces the environmental impact, is necessary. To achieve increased engine efficiency, a technical solution is to lower the heat losses in the combustion chamber. Among them, the heat losses to the pistons are the preferential route, due to their extensive impact on fuel consumption. In this paper, porous thermal barrier coatings with large pores were applied to the pistons of diesel engines to improve engine efficiency. Atmospheric Plasma Spray (APS) process and porosity former TBC feedstock were employed to obtain high porosity coatings with large pores. Scanning Electron Microscopy (SEM) was utilized to investigate the microstructure of the coating in coupons and pistons. The optical properties of the coatings were explored with two methods: the spectral normal hemispherical reflectivity at room temperature (SNHRRT) and spectral normal emissivity at high temperature (SNEHT). The coatings’ behavior under thermal cyclic conditions was assessed by Flame Rig Test. Microstructure analysis was also performed before and after the test to identify the failure mechanisms. The engine efficiency was evaluated by measuring the Indicated Specific Fuel Consumption (ISFC) in a single-cylinder engine test. The results showed that porous coating with large pores combined with a higher emissivity can withstand the engine environment well and have the potential to provide enhancements in engine efficiency.

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Section: R +mentioning

confidence: 99%