Thermal insulation capability and adhesion strength of unpyrolyzed thick thermal barrier coatings

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-04-01 DOI:10.1016/S1003-6326(24)66466-6

Mohammad IZADINIA , Reza SOLTANI , Mahmoud HEYDARZADEH SOHI , Javad MOSTAGHIMI

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Abstract

Thermal insulation capability and adhesion strength of thick thermal barrier coatings (TBC) produced by unpyrolyzed powder (UPTTBC) were compared with those of the conventional TBC, thick TBC (TTBC), and dense vertically cracked (DVC) TTBC. Thermal insulation capability was evaluated using temperature drop. The adhesion strengths of the coatings were also measured by pull-off test method according to ASTM C633. The results indicated that the adhesion strength of UPTTBC and DVC TTBC was 35% and 25% higher than that of the TTBC, respectively. This could imply that the non-melted areas with sub-micron dimensions in UPTTBC structure, act as a trap and prevent the cracks propagation. In addition, the results of thermal insulation tests showed that DVC TTBC coatings had the lowest thermal insulation capability with temperature drop rate of 0.28 °C/µm and UPTTBC coatings had the highest insulation capability with temperature drop rate of 0.40 °C/µm. Due to the presence of sub-micron zones in the microstructure of UPTTBCs, the coatings exhibited superior thermal insulation capability. In contrary, the DVC TTBC showed the lowest thermal insulation capability because of its dense structure.

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未水解厚隔热涂料的隔热能力和附着强度

将未热解粉末（UTPTBC）与传统 TBC、厚 TBC（TTBC）和致密垂直裂纹（DVC）TTBC 生产的厚隔热涂层（TBC）的隔热能力和附着强度进行了比较。隔热能力通过温降进行评估。涂层的附着强度也根据 ASTM C633 采用拉拔测试法进行了测量。结果表明，UTPTBC 和 DVC TTBC 的附着强度分别比 TTBC 高出 35% 和 25%。这可能意味着 UPTTBC 结构中亚微米尺寸的非熔化区域起到了捕捉和阻止裂缝扩展的作用。此外，隔热测试结果表明，DVC TTBC 涂层的隔热能力最低，温度下降率为 0.28 ℃/µm，而 UPTTBC 涂层的隔热能力最高，温度下降率为 0.40 ℃/µm。由于 UPTTBC 的微观结构中存在亚微米区，因此涂层的隔热能力更强。相反，DVC TTBC 因其致密结构而显示出最低的隔热能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.