Review of ceramic materials that used as a thermal barrier in diesel engine pistons

Abstract

The diesel engines is used in many industrial applications in addition to that in cars. In this type of engine the fuel-air mixture will burn behind the piston inside the cylinder and will produce high temperature. Developing diesel engines to be more efficient, less fuel consumption, low gas emissions, and high performance that has been pursued for more than two decades. Increased combustion temperature can enhance engine power and efficiency while lowering specific fuel consumption and CO emission rates. Ceramic thermal barrier coatings have been identified as the most promising method for achieving these goals. Due to the abundance of materials and technologies, it is necessary to understand the best material suitable for depositing and the techniques required to complete the process. Many researchers have studied a wide range of materials like ZrO2, Al2O3, mullite, YSZ, and forsterite to develop suitable systems that use thermal barrier coatings. Additionally, many techniques such as EB-PVD and ASP have been developed to meet the requirements of these systems. This paper will examine the materials and technologies that can be used to improve internal diesel engine performance.

A Comprehensive Understanding of Thermal Barrier Coatings (TBCs): Applications, Materials, Coating Design and Failure Mechanisms

“…Mullite is a relatively simple material consisting of silica (SiO 2 ) and alumina (Al 2 O 3 ) in the form of (3Al 2 O 3 •2SiO 2 ). It is used as a coating material due to its low density and resistance to corrosion and creep [150]. Its thermal properties include a melting point of 1880 • C, thermal conductivity of 3.5 Wm −1 K −1 and a relatively low CTE of 5.3 × 10 −6 K −1 at 1000 • C [151].…”

Investigation of novel ceramic materials (Al₂O₃ and SSiC) for high-pressure pumps’ delivery sections

“…It is therefore important to avoid structure discontinuities, e.g. micro-cracks, by maintaining a low tolerance for defects [14]. Even micro-scale cracks, within the tolerance range, smaller than critical cracks, can develop and contribute to their further propagation [20].…”

“…Even micro-scale cracks, within the tolerance range, smaller than critical cracks, can develop and contribute to their further propagation [20]. Compressive and flexural strengths should also be closely monitoredceramic materials withstand pressure loads much better than metals [9,14,20,25]. The nature of the operation of precision pairs, i.e.…”