Thick thermal barrier coatings (TBCs) have a significant potential to increase thermal efficiency by reducing heat transfer losses. However, in conventional combustion modes, the drawbacks associated with charge heating and higher propensity to knock have outweighed the efficiency benefits. Since the advanced low-temperature combustion (LTC) concepts are fundamentally different from the conventional combustion modes, these penalties do not exist in most of LTCs.

The current experimental study shows the feasibility and benefits of thick TBCs with advanced LTC enabled by two different fuels: conventional gasoline and wet ethanol 80 (WE80, i.e., 80% ethanol and 20% water by mass). A total of five pistons were tested, including two metal baselines and three TBC-coated pistons with different thicknesses or surface finishes. A load sweep was conducted with each fuel on each piston within the same constraints. The thick TBCs extends the low load limit by about 15% for both gasoline and WE80 cases. A deterioration of the high load limit was not observed, which implies that the charge heating penalty does not occur in LTCs. The combustion efficiency increased for the thicker TBC by up to 2 percentage points, and the fuel conversion efficiency was increased by up to 4.3%. The gasoline cases experience the largest benefits at low load, while the wet ethanol experiences the largest benefits at mid-to-high load. The intake temperature requirement is successfully reduced by 10 to 15 K. It is also observed that the dense sealing layer results in a significant improvement to UHC emissions. All of the coated pistons survived the 10 to 20 hours of engine operation with no visual failure.

厚的隔热涂层（TBC）具有显着的潜力，可通过减少传热损失来提高热效率。然而，在常规燃烧模式中，与增压加热相关的缺点和较高的爆震倾向超过了效率收益。由于先进的低温燃烧（LTC）概念从根本上不同于常规燃烧模式，因此在大多数LTC中都不存在这些惩罚措施。

当前的实验研究表明，由两种不同的燃料（传统的汽油和湿乙醇80（WE80，即按质量计80％的乙醇和20％的水））支持的具有先进LTC的浓TBC的可行性和益处。总共测试了五个活塞，包括两个金属基线和三个具有不同厚度或表面光洁度的TBC涂层活塞。在相同的约束下对每个活塞上的每种燃料进行负荷扫描。对于汽油箱和WE80箱，较厚的TBC可使低负荷极限扩大了约15％。没有观察到高负载极限的恶化，这意味着在LTC中不会发生充电发热损失。较浓的TBC的燃烧效率提高了2个百分点，燃油转换效率提高了4.3％。汽油箱在低负荷下具有最大的好处，而湿乙醇在中高负荷下具有最大的好处。进气温度要求成功降低了10至15K。还可以看到，致密的密封层显着改善了UHC排放。所有带涂层的活塞在发动机运转10到20个小时后均能幸免，没有视觉故障。