Effect of loading rate and holding time on hardness and Young's modulus of EB-PVD thermal barrier coating
Effect of loading rate and holding time on hardness and Young's modulus of EB-PVD thermal barrier coating
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DOI：
10.1016/s0257-8972(03)00861-2
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发表时间：
2004-04
影响因子：
5.4
通讯作者：
Shuqi Guo;Y. Kagawa
中科院分区：
文献类型：
--
作者：
Shuqi Guo;Y. Kagawa
采用超微压痕技术研究了电子束物理气相沉积热障涂层的加载速率和最大加载时间对涂层硬度和杨氏弹性系数的影响。压痕试验是在三种不同的加载速率和最大加载下的保持时间下进行的。涂层的平均硬度随加载速率的增加而显著增加，随保温时间的延长而略有下降。然而，随着加载速率的增加，杨氏模数显著降低。随着保温时间的延长，杨氏模数略有增加。硬度和杨氏模数对加载速率和保持时间的不同依赖关系与压痕试验中发生的蠕变变形有关。
The effect of the loading rates and duration of holding periods at the maximum load on hardness and Young's modulus in thermal barrier coatings fabricated by the electron beam physical vapor deposition process has been studied using an ultra-micro-indentation technique. The indentation tests were carried out with three different loading rates and durations of holding time at a maximum load. The average hardness of the coating significantly increased with increasing loading rate, in contrast, it slightly decreased with holding time. However, a substantial decrease in Young's modulus was observed with the increase in loading rate. A slight increased Young's modulus was found with an increase in holding time. The different dependences of both the hardness and Young's modulus on loading rate and holding time were associated with creep deformation occurring during indentation testing.