Ceramic Material for Thermal Barrier Coatings in Compression Ignition Engine for its Performance Evaluation with Biodiesel

2021 ◽  
Author(s):  
H.R. Amriya Tasneem ◽  
K.P. Ravikumar ◽  
H.V. Ramakrishna ◽  
B. Kuldeep
Keyword(s):  
Performance Evaluation ◽  
Ceramic Material ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Barrier Coatings

Assessing the Impact of Thermal Barrier Coatings on Charge Temperature Stratification Within a Homogeneous Charge Compression Ignition Engine

2018 ◽  
Author(s):  
Ryan O’Donnell ◽  
Tommy Powell ◽  
Zoran Filipi ◽  
Mark Hoffman
Keyword(s):  
Thermal Barrier Coatings ◽  
Homogeneous Charge Compression Ignition ◽  
Thermal Barrier ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Barrier Coatings ◽  
Charge Mass ◽  
The Impact ◽  
Charge Temperature ◽  
Homogeneous Charge

The application of a Thermal Barrier Coating (TBC) to combustion chamber surfaces within a Low Temperature Combustion (LTC) engine alters conditions at the gas-wall boundary and affects the temperature field of the interior charge. Thin, low-conductivity, TBCs (∼150μm) exhibit elevated surface temperatures during late compression and expansion processes. This temperature ‘swing’ reduces gas-to-wall heat transfer during combustion and expansion, alters reaction rates in the wall affected zones, and improves thermal efficiency. In this paper, Thermal Stratification Analysis (TSA) is employed to quantify the impact of Thermal Barrier Coatings on the charge temperature distribution within a gasoline-fueled Homogeneous Charge Compression Ignition (HCCI) engine. Using an empirically derived ignition delay correlation for HCCI-relevant air-to-fuel ratios, an autoignition integral is tracked across multiple temperature ‘zones’. Charge mass is assigned to each zone by referencing the Mass Fraction Burn (MFB) profile from the corresponding heat release analysis. Closed-cycle temperature distributions are generated for baseline (i.e., ‘metal’) and TBC-treated engine configurations. In general, the TBC-treated engine configurations are shown to maintain a higher percentage of charge mass at temperatures approximating the isentropic limit.

scholarly journals Ce1−x Sm x O2−x/2—A novel type of ceramic material for thermal barrier coatings

2016 ◽  
Vol 5 (3) ◽  
pp. 244-252 ◽  
Author(s):  
Xiao-ge Chen ◽  
Haoming Zhang ◽  
Hong-song Zhang ◽  
Yong-de Zhao ◽  
Gang Li
Keyword(s):  
Ceramic Material ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Barrier Coatings

Characterization of thermal barrier coatings formed by electon-beam physical vapor deposition (EB-PVD)

1989 ◽  
Vol 47 ◽  
pp. 426-427
Author(s):  
Ozer Unal
Keyword(s):  
Thermal Barrier Coatings ◽  
Physical Vapor Deposition ◽  
Ceramic Coating ◽  
High Vacuum ◽  
Ceramic Coatings ◽  
High Energy ◽  
Thermal Barrier ◽  
Protective Oxide ◽  
Barrier Coatings ◽  
Energy Beam

Interest in ceramics as thermal barrier coatings for hot components of turbine engines has increased rapidly over the last decade. The primary reason for this is the significant reduction in heat load and increased chemical inertness against corrosive species with the ceramic coating materials. Among other candidates, partially-stabilized zirconia is the focus of attention mainly because ot its low thermal conductivity and high thermal expansion coefficient.The coatings were made by Garrett Turbine Engine Company. Ni-base super-alloy was used as the substrate and later a bond-coating with high Al activity was formed over it. The ceramic coatings, with a thickness of about 50 μm, were formed by EB-PVD in a high-vacuum chamber by heating the target material (ZrO2-20 w/0 Y2O3) above its evaporation temperaturef >3500 °C) with a high-energy beam and condensing the resulting vapor onto a rotating heated substrate. A heat treatment in an oxidizing environment was performed later on to form a protective oxide layer to improve the adhesion between the ceramic coating and substrate. Bulk samples were studied by utilizing a Scintag diffractometer and a JEOL JXA-840 SEM; examinations of cross-sectional thin-films of the interface region were performed in a Philips CM 30 TEM operating at 300 kV and for chemical analysis a KEVEX X-ray spectrometer (EDS) was used.

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