Review on Ceramic Application in Automotive Turbocharged Engines

2014 ◽  
Vol 660 ◽  
pp. 219-228 ◽  
Author(s):  
Alias Mohd Nor ◽  
Muhammad Rabiu Abbas ◽  
Srithar Rajoo ◽  
Muhammad Hanafi Md Sah ◽  
Norhayati Ahmad
Keyword(s):  
Combustion Engine ◽  
Thermal Barrier ◽  
Thermal And Mechanical Properties ◽  
Structural Components ◽  
Structural Ceramics ◽  
Barrier Coatings ◽  
Automotive Engine ◽  
Heavy Loads ◽  
Engine Components ◽  
Selection Of

Research on the use of thermal barrier coatings in internal combustion engine had contributed in achieving higher thermal efficiency, improved combustion and reduced emissions of the engine. Low thermal conductivity ceramics can be used to control the temperature distribution and heat flow in high temperature structural components due to its inherent thermal insulation properties. For this reason much has been and is being done on the study and development of ceramics for use in automotive engine components working under severe temperature conditions and heavy loads due to their inherent thermal and mechanical properties. The objective of the study is to review the contributions of structural ceramics in the development and improvement of some of the major automotive engine components working under severe conditions of temperature. It is expected that the study will serve as a useful guide for the selection of materials which can withstand severe conditions of temperature and heavy loads for a novel turbocharger and turbocharged engine applications.

Automated Gaging of Surface Texture on Engine Components

2015 ◽  
Author(s):  
Turker Oktay
Keyword(s):  
Surface Texture ◽  
Combustion Engine ◽  
Surface Preparation ◽  
Target Surface ◽  
Operating Life ◽  
Design Engineers ◽  
Texture Parameters ◽  
Repeatability And Reproducibility ◽  
Engine Components ◽  
Selection Of

Surface texture of engine components such as crankshafts and camshafts is one of the most important factors that determine the performance, efficiency and the operating life of an internal combustion engine. Current practices and the challenges faced by design engineers in specifying the target surface topography to meet these goals have been reviewed. Once specified, the surface texture must be measured fast, accurately and repeatably in the rough environment of an engine manufacturing plant. The key components of an automated skidded surface finish measuring gage designed with these criteria in mind are described in this paper. The gage has 7 axes of motion and 3 stylus probes oriented in the axial and radial directions to take axial and facial measurements on journal and cam lobe surfaces and thrust bearing surfaces. The selection of surface texture parameters to best describe the desired surface texture of these engine components was investigated. The final stage of surface preparation is often the superfinishing process. The measurement gage must be able to provide the sensitivity and repeatability that are required for measuring the finely finished surfaces generated by this process. Typical surface texture results of a superfinishing process achieved on crankshafts are described. The results of a Gage Repeatability and Reproducibility (R&R) study performed on the surface texture measuring gage are presented.

Applications of Dual-Energy X-ray Computed Tomography to Structural Ceramics*

1988 ◽  
Vol 32 ◽  
pp. 629-640
Author(s):  
W. A. Ellingson ◽  
M. W. Vannier
Keyword(s):  
Computed Tomography ◽  
Evaluation Method ◽  
Combustion Engine ◽  
Mass Density ◽  
Energy Levels ◽  
Dual Energy ◽  
Structural Ceramics ◽  
X Ray ◽  
X Ray Computed ◽  
Engine Components

AbstractAdvanced structural ceramics (Si3N4, SiC, A12O3, ZrO2) are rapidly being developed with sufficient fracture toughness to be considered for engineering applications such as internal combustion engine components, rotating turbine engine components, and heat recovery systems. X-ray computed tomography (CT) is a promising nondestructive evaluation method for these ceramics, but beam hardening presents a serious problem in the interpretation of CT images generated with polychromatic X-ray sources by creating artifacts . Dual-energy X-ray techniques have the potential to eliminate these problems. In addition, in theory, dual energy allows generation of quasimonochromatic equivalent images, which should allow verification of theoretically determined optimum energies. In using dual-energy methods, the high-and low-energy images are nonlinearly transformed to generate two energy-independent images characterizing the integrated Compton/photoelectric attenuation components. Characteristic linear combinations of these two "basis" images can serve to identify unknown materials and generate synthesized monoenergetic images.The dual-energy method has been used to study structural ceramics as well as liquids that are close to ceramic materials in atomic number and mass density. The work was done on a Siemens DR-H CT machine with 85- and 125-kVp energy levels. Test samples included Si3N4 cylinders ranging from 10 to 50 mm in diameter, liquid Freon TF, and densified SiC.

Erosion Testing of Thermal Barrier Coatings in a High Enthalpy Wind Tunnel

2014 ◽  
Author(s):  
M. Kirschner ◽  
T. Wobst ◽  
B. Rittmeister ◽  
Ch. Mundt
Keyword(s):  
Wind Tunnel ◽  
Thermal Barrier Coatings ◽  
Gas Turbines ◽  
Test Facility ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Coating Degradation ◽  
Air Jet ◽  
Erosion Test ◽  
Engine Components

One of the major problems facing the users of aircraft engines and stationary gas turbines in dusty and dirty environments is erosion, causing engine performance deterioration. Thermal barrier coatings (TBCs) are often applied on metal engine components as combustor heat shields or tiles as well as turbine blades allowing enhanced operating temperatures and resulting in increased thermal efficiency of the turbine and also reduced fuel consumption and gaseous emission. Erosive attack by airborne dust or fly ash, coarse particles causes coating degradation resulting in lifing issues of engine components. In the present study an erosion test facility was used to simulate the mechanisms of coating degradation expected in gas turbines in a more realistic way closer to real engine conditions. A loading situation combining thermal gradient cycling and erosive media was used. The experiments has been performed with an arc heated plasma wind tunnel (total enthalpy up to 20 MJ/kg), which is available at the Institute for Thermodynamics at the University of the Federal Armed Forces in Munich, Germany. The experimental setup and the integration of the air jet erosion test rig into the existing plasma wind tunnel will be elucidated. Different plasma sprayed thermal barrier coating materials, including the standard TBC material yttria-stabilised zirconia, were investigated regarding their erosion resistance. For validation and verification, samples of nickel-based Mar-M 247 and INCO 718 alloys have been used.

scholarly journals Thermomechanical fatigue characterization of zirconia (8%Y2O3-ZrO2) and mullite thermal barrier coatings on diesel engine components: Effect of coatings on engine performance

2000 ◽  
Vol 214 (5) ◽  
pp. 729-742 ◽  
Author(s):  
P Ramaswamy ◽  
S Seetharamu ◽  
K B R Verma ◽  
N Raman ◽  
K J Rao
Keyword(s):  
Diesel Engine ◽  
Thermal Barrier Coatings ◽  
Fuel Efficiency ◽  
Engine Performance ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
X Ray ◽  
Piston Head ◽  
Mullite Coatings ◽  
Engine Components

8%Y2O3-stabilized zirconia (8YPSZ) and mullite (3Al2O3·2SiO2) powders, which were made plasma sprayable by using an organic binder (polyvinyl alcohol), have been plasma spray coated on to the piston head, valves and cylinder head of a 3.8kW single-cylinder diesel engine, previously coated with Ni-Cr-Al-Y bond coat. The engine with components coated with 250 μm thick 8YPSZ and 1 mm thick mullite thermal barrier coatings has been evaluated for fuel efficiency and for endurance during 500 h long rigorous tests. Improved fuel efficiency was shown by the engine with coated components and the results are discussed. The coatings and the coated components have also been examined for phases, microstructure and chemical composition by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX). Mullite coatings were found to exhibit increased resistance to microcracking compared with 8YPSZ during the 500 h endurance test.

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