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论文类型：期刊论文

发表时间：2014-04-01

发表刊物：ULTRASONICS

收录刊物：SCIE、EI、PubMed、Scopus

卷号：54

期号：4

页面范围：1005-1009

ISSN号：0041-624X

关键字：Thermal barrier coating; TGO; Ultrasonic; Reflection coefficient amplitude spectrum; Acoustic impedance

摘要：The thermally grown oxide (TGO) growth at the interface of ceramic coating/ bond coating in thermal barrier coatings (TBCs) was evaluated by ultrasonic reflection coefficient amplitude spectrum (URCAS). A theoretical analysis was performed about the influence of acoustic impedance match relationship between the ceramic coating and its adjacent media on URCAS. The immersion ultrasonic narrow pulse echo method was carried out on the TBC specimen before and after oxidation under 1050 degrees C x 1 h for 15 cycles. The resonant peaks of URCAS obtained before and after oxidation showed that TGO which generated between the ceramic coating and bond coating due to the oxidation, changed the acoustic impedance match between the ceramic coating and its adjacent media. This method is able to nondestructively characterize the generation of TGO in TBCs, and is important to practical engineering application. (C) 2013 Elsevier B.V. All rights reserved.