Al2O3ZrO2 composite coatings for thermal-barrier applications
Al2O3ZrO2 composite coatings for thermal-barrier applications
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用于热障应用的 Al2O3ZrO2 复合涂层
DOI：
10.1016/s0266-3538(96)00111-x
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发表时间：
1997
影响因子：
9.1
通讯作者：
K. J. Rao
中科院分区：
文献类型：
--
作者：
P. Ramaswamy;S. Seetharamu;K. Varma;K. J. Rao
在粘结涂层低碳钢表面等离子喷涂Al_2O_3和8%Y_2O_3--ZrO_2梯度交替涂层及其混合物。评估了它们的抗热震性、热障特性、抗热腐蚀性(熔融的氯化钠腐蚀剂)和侵蚀深度、结合强度和相的存在。尽管观察到了423-623K的前后温降，但一些涂层即使在100次热冲击循环后仍表现出良好的附着力。在梯度层的顺序中，与粘结层直接接触的氧化物似乎影响性能，特别是在厚度为150和300μm的涂层中。在较高的热面温度(1273K，1h)下，熔融的氯化钠极易侵蚀薄膜，其结合强度明显下降50-60%。碱性元素的扩散也被发现取决于直接面对熔化腐蚀剂的外层的化学成分。
Graded alternate layers of A12O3and 8% Y2O3ZrO2and their admixtures were plasma sprayed onto bond-coated mild steel. They were evaluated for thermal-shock resistance, thermal-barrier characteristics, hot corrosion resistance (molten NaCl corrodant) and depth of attack, adhesion strength and the presence of phases. Although front-back temperature drops of 423–623 K were observed, some of the coatings showed good adherence even after 100 thermal shock cycles. In the sequence of the graded layers, the oxide which is directly in contact with the bond coat appears to influence the properties especially in coatings of 150 and 300 μm thickness. Molten NaCl readily attacks the films at high hot-face temperatures (1273 K for 1h) and the adhesive strength falls significantly by 50–60%. Diffusion of alkaline elements is also found to depend on the chemical composition of the outer coating directly facing the molten corrodant.