Effect of the Textured Interface on the Strength of the Coating

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420008
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: The University of Tokyo
• Principal Investigator: Fujimoto Koji 東京大学, 工学(系)研究科(研究院), 教授 (40182993)
• Co-Investigator(Renkei-kenkyūsha): UENISHI Koji 東京大学, 大学院工学系研究科, 准教授 (60311776)
• Research Collaborator: KOBAYASHI Akira ; SEKINE Masanao ; HASHIMOTO Naoto ; SASAKI Natsumi ; YAMASHITA Yohei ; YAMAUCHI Yohei
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 皮膜 / コーティング / テクスチャリング / き裂 / 剥離 / 応力解析 / 材料強度

Outline of Final Research Achievements

Recently, coatings are often adopted as surface modification method. However, cracking or delamination of a coating may induce serious problems. For enhancing the adhesion strength between the coating and the substrate, surface roughening or texturing is conducted. However, the interface geometry influences the stresses in the coating and further, the behavior of the cracking and delamination of the coating. In this study, tensile tests were carried out for the specimens with the zirconia coating over the roughened or textured surface of the substrate. By measuring the crack length on the cross section of the coating, we found its correlation with the strain energy stored in the coating. Furthermore, we developed the numerical method for the high precision stress analysis of the coating with a periodically snaking interface.

Free Research Field

機械材料・材料力学