In this study, thermal barrier coatings with different porosities were prepared using 8 wt-% yttria-stabilized zirconia by atmospheric plasma spray on a superalloy substrate. The porosity of the ceramic coating was increased by modulating the primary gas flow rate and the secondary gas flow rate. The elastic modulus and fracture toughness of the coatings were measured by the indentation method, and the thermal shock resistance was evaluated by quenching the samples from 1050°C to room temperature. The Vickers hardness and elastic modulus of the coating were decreased by increasing the volume of the pores, and the fracture toughness was enhanced. It was found that the thermal shock resistance was improved owing to the stress release due to the pores.

在这项研究中，使用8 wt％的氧化钇稳定的氧化锆通过大气等离子喷涂在高温合金基底上制备了具有不同孔隙率的隔热涂层。通过调节一次气体流量和二次气体流量，可以增加陶瓷涂层的孔隙率。通过压痕法测量涂层的弹性模量和断裂韧性，并通过将样品从1050℃骤冷至室温来评估耐热冲击性。通过增加孔的体积来降低涂层的维氏硬度和弹性模量，并提高断裂韧性。发现由于孔导致的应力释放而提高了耐热冲击性。