DEVELOPMENT OF HIGH-TEMPERATURE EDGE-INFDENT APPARATUS THATENABLES IN-SITU MEASUREMENT OF HIGH-TEMPERATURE DELAMINATION STRENGTH OF CERAMIC COATING

在喷气发动机和燃气轮机的效率方面，增加了对能源节约和环境保护的重要性。沿着这条线，热屏障涂层（TBC）由陶瓷制成，已应用于燃气涡轮机和燃烧室的叶片。However， TBC可以在高温和热循环中进行长期暴露，以消除涂层和基底之间的界面氧化。WC-Cocermet所涂的铸造和锻造的情况几乎是一样的。当前研究的目标是通过which in-situ evaluation of delamination strength can be carried out at high temperature.First， the TBC specimens coated by 8 mass%Y_2 O_3·ZrO_2？amics were kept at high temperature to obtain the information on the degradation of interface。在同一时间，一台测试机器是设计和制造的。设计的主要观点是如何确切地确定涂层上的位置，只在内部接触之前将内部翻转过来，并保护内部和保持者从高温（1027 - 1273 K）中保护内部和保持者。第二，各种测试都被用来测试该装置的特征。结果如下： （1）对缺失负载的检测在高温下是很困难的，因为临界点在负载置换曲线上不会出现。However，中断方法可以用来获得删除负载的上/下限制。（2）加载速度并不影响延迟加载，所以较高的速度应该被应用到对输入者和持有者的损害。（3）当SiC锥体形状的顶部角度的入口变得更容易。80度的中心经常被打破，所以一个更大的角度是必要的。还有那些问题仍然存在，那么设备就可以用来有效地评估高温畸变的强度。

Increase in efficiency of jet engine and gas turbine has been important for energy saving and environment preservation. Along this line, thermal barrier coating (TBC) by ceramics spraying has been applied to blades of gas turbine and combustion chamber. However, TBC can be delaminated by long-time exposure at high temperature and thermal cycling due to the oxidation of interface between coating and substrate. The situation is almost the same for casting and forging dies coated by WC-Co cermet. The purpose of present research is to develop the apparatus by which in-situ evaluation of delamination strength can be carried out at high temperature.First, the TBC specimens coated by 8mass%Y_2O_3・ZrO_2 ceramics were kept at high temperature to obtain the information on the degradation of interface. At the same time, a testing machine was designed and fabricated. Main viewpoints of design were how to decide the indent position on coating exactly, turn back the indenter just before the indenter reaches substrate deeply, and protect the indenter and holder from high temperature (1027〜1273K).Secondly, various tests were carried out to examine the characteristics of the apparatus. The results were as follows : (1) Detecting of delamination load is difficult at high temperature because the kink point does not appear on load-displacement curve. However, the interruption method can be used to obtain the upper and lower limits of delamination load. (2) The loading speed does not influence the delamination load, so that the higher speed should be applied to avoid the damage of indenter and holder. (3) The delamination is easier when the top angle of SiC cone-shaped indenter is smaller. However the indenter with 80° is often broken, so that a larger angle will be necessary. Although the problems remained, the apparatus can be used to evaluate the high-temperature delamination strength effectively.