Abstract

Thermal barrier coatings to protect and extend the life of hot-end parts of gas turbine engine have come a long way from their introduction almost half a century ago, having been the subject of constant innovations determined to push their capabilities. The need for even more efficient next generation of gas turbines will require higher operating temperatures that results in an increased near-infrared radiative output. Unfortunately, the state-of-the-art yttria-stabilized zirconia is transparent to near-infrared leading to direct radiative heating of the substrate, significantly reducing its life. This opens up the requirement for advanced thermal barrier coatings that can optically reflect the incident radiation reducing overall thermal transport to the underlying super-alloy. The present review gives a thorough overview of the current state of research into the approaches employed to achieve thermal radiative barrier coatings for reflection of near-infrared radiation; either by modification of existing infrastructure or via completely novel approaches. Moreover, to complement the experimental research in this up-and-coming domain, an emphasis is laid on the modeling approaches to expedite further advancements.

摘要

用于保护和延长燃气涡轮发动机热端部件寿命的热障涂层自近半个世纪前推出以来已经取得了长足的进步，一直是不断创新的主题，决心提高其能力。对更高效的下一代燃气轮机的需求将需要更高的工作温度，从而增加近红外辐射输出。不幸的是，最先进的氧化钇稳定氧化锆对近红外是透明的，导致基材直接辐射加热，从而显着缩短其寿命。这就提出了对先进热障涂层的需求，该涂层可以光学反射入射辐射，减少到底层超级合金的整体热传输。本综述全面概述了用于实现反射近红外辐射的热辐射屏障涂层的方法的研究现状；通过修改现有基础设施或通过完全新颖的方法。此外，为了补充这个新兴领域的实验研究，重点放在建模方法上以加快进一步的进展。