APPLICATIONS OF CERAMIC COATINGS AS TBCs ON THE INTERNAL COMBUSTION ENGINE VALVES (original) (raw)

Alternative Thermal Barrier coatings for CI engines A Research review

The depletion of supply of fossil fuels and their increased cost has driven the attention towards energy security. The energy security can be partially achieved by improving the efficiency of energy producing equipment’s. Diesel fuels can be used more efficiently in low heat rejection engines (LHR), in which the temperature of combustion chamber is increased by creating thin layer of ceramics, a thermal barrier. Also the use of thermal barrier coatings (TBCs) to increase the combustion temperature in diesel engines has been pursued for over 20 years. Increased combustion temperature can increase the efficiency of the engine, decrease the CO and unburnt Hydrocarbons (UBHC). TBCs have not yet met with wide success in diesel engine applications. To reach the desirable temperature of 850-900°C in the combustion chamber from the current temperature of 350-400°C, a coating with a thickness of order 1mm is required. This paper gives a complete review on the TBCs on CI engines.

Effects of Thermal Barrier Coatings on Diesel and Gas turbine engines: A review

Future demands for significantly higher engine operating temperature, fuel efficiency and better engine reliability are the driving force behind the development of Thermal barrier coatings (TBCs).Conventional thermal barrier coating (TBC) systems consist of a thermally grown oxide (TGO) sandwiched between topcoat and bond coat. This bond coat is bonded to a metal substrate. Zirconia-yttria based oxides and (Ba,Sr)Al2Si2O8 (BSAS)/mullite based silicates have been used as thermal barrier coating materials. The thermal barrier coating system has effects on the fuel consumption, the power and the combustion efficiency, pollution contents and the fatigue lifetime of engine components. This article describes the effects of thermal barrier coatings on Diesel and gas turbine engines based on the pioneering work of many researchers in this area.

Coating of diesel engine with new generation ceramic material to improve combustion and performance

Thermal Science, 2021

In this study, piston and valve surfaces of a Diesel engine to improve exhaust emis?sion and engine performance values, NiCr with bond coat and without bond coat with Cr2O3, Al2O3+13%TiO2, Cr2O3+25%Al2O3 coatings were coated using plasma spray method. By examining the micro-structures of the coating materials, it was observed that a good coating bond is formed. In this study, unlike other coating applications, two different and proportions of specific ceramic powders were coated on the combustion chamber elements, mounted on a Diesel engine, and their effects on engine performance and emissions were tested on the engine dynamometer. For this purpose, the internal combustion engine was operated at 1400, 1700, 2000, 2300, 2600, 2900, and 3200 rpm engine speeds and engine power, engine torque, in-cylinder pressure changes and heat release rate values were recorded. In this study, the that results were obtained by comparing thermal barrier coated engine with standard engine. An increase...

IAETSD-INVESTIGATION OF THERMAL BARRIER COATING ON I.C ENGINE PISTON

Thermal Barrier Coating(TBC) are used to stimulate the reduced heat rejection in engine cylinders.It reduces the heat transfer to the water cooling jacket and exhaust system.Thus improves the mechanical efficiency.In this operation Zirconia Ceramic is coated on the I.C engine piston using Plasma arc technique.Their performance characteristics and results are studied and tabulated.

The effect of thermal barrier coatings on diesel engine performance

Surface and Coatings Technology, 2007

Ceramic coatings hold significant promise in the reduction of wear and abrasion failure in reciprocating and rotary engines for transportation and stationary power. They also have application as thermal barriers to improve the efficiency of the engines, by reducing energy loss and cooling requirements. In this study, the effects of ceramic coating on the performance of the diesel engine were investigated. The research engine was a fourstroke, direct injected, six cylinder, turbo-charged and inter-cooled diesel engine. This engine was tested at different speeds and loads conditions without coating. Then, the combustion chamber surfaces, cylinder head, valves and piston crown faces were coated with ceramic materials. The layers were made of CaZrO 3 and MgZrO 3 and plasma coated onto the base of the NiCrAl bond coat. The ceramic-coated research engine was tested at the same operation conditions as the standard (without coating) engine. The results indicate a reduction in fuel consumption and an improving effective efficiency of the engine.

Thermal Barrier Coatings for Gas-Turbine Engine Applications

Science, 2002

Hundreds of different types of coatings are used to protect a variety of structural engineering materials from corrosion, wear, and erosion, and to provide lubrication and thermal insulation. Of all these, thermal barrier coatings (TBCs) have the most complex structure and must operate in the most demanding high-temperature environment of aircraft and industrial gas-turbine engines. TBCs, which comprise metal and ceramic multilayers, insulate turbine and combustor engine components from the hot gas stream, and improve the durability and energy efficiency of these engines. Improvements in TBCs will require a better understanding of the complex changes in their structure and properties that occur under operating conditions that lead to their failure. The structure, properties, and failure mechanisms of TBCs are herein reviewed, together with a discussion of current limitations and future opportunities.

Thermal Barrier Ceramic Coatings — A Review

Thermal barrier coatings (TBCs) provide effective thermal barrier to the components of gas turbine engines by allowing higher operating temperatures and reduced cool‐ ing requirements. Plasma spraying, electron-beam physical vapor deposition, and sol‐ ution precursor plasma spray techniques are generally used to apply the TBCs on the metallic substrates. The present article addresses the TBCs formed by different proc‐ essing techniques, as well as the possibility of new ceramic, glass-ceramic, and com‐ posite materials as TBCs. Promising bond coat materials for a TBC system have been also stated.