電気学会論文誌A(基礎・材料・共通部門誌)
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
論文
テラヘルツ波を用いた遮熱コーティングの表面粗さ測定
福地 哲生布施 則一岡田 満利藤井 智晴水野 麻弥福永 香
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2017 年 137 巻 3 号 p. 147-152

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Thermal barrier coating (TBC) is applied to high temperature conditions in gas turbines, such as rotor blades and combustors, to protect the metal substrate surface against hot gas flow. The surface roughness of TBC is reported to affect the heat transfer coefficient, so surface roughness measurement is necessary for improving the thermal analysis of TBS. In this report, terahertz waves were used to measure the surface roughness of TBC specimens. An analytical one-dimensional model based on time of flight was constructed to confirm that the reflection characteristics of a terahertz wave pulse generated by a photoconductive antenna obey the Debye-Waller factor. The surface roughness of five TBC specimens fabricated by the same process was measured to be 16±2µm, which was in agreement with the microscopic observation result of the surface profile of a TBC specimen fabricated in the same lot. These results showed that terahertz waves are effective for measuring the surface roughness of TBC.

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