Effect of Annealing on Plasma Sprayed Zirconia/Alumina Composite Coating

摘要：

In thermal barrier coatings (TBC), failure occurs near or at the interface between the metallic bondcoat and topcoat. During high temperature service an oxide scale consisting mainly of α-alumina forms and is named thermally grown oxide (TGO) along the bond/topcoat interface. For diminishing the creation of thermally grown oxide (TGO), a dense coating with low residual stress and thermal stress buffer layer was preferable. In this study, to deposit such a kind of coating, a gas tunnel type plasma spraying system was utilized to produce an alumina/zirconia functionally graded thermal barrier coating and discussed its physical and mechanical properties, thermal behavior and high temperature oxidation resistance of the coating are discussed. Consequently, the proposed system exhibited superior mechanical properties and oxidation resistance at the expenses of a slightly lower thermal insulating effect. This interlayer is preferred in order to minimize the detrimental effect of the phase transformation of γ- Al2O3 to α-Al2O3.

关键词： Plasma spraying Thermal barrier coating Oxidation X-ray diffraction Scanning electron microscope Hardness

作者: Akira KOBAYASHI Yasutaka ANDO Kazuya Kurokawa

作者单位: Osaka University Ashikaga Institute of Technology

会议类型: 国际会议

会议名称: The Fifth International Conference on Physical and Numerical Simulation of Materials Processing(第五届材料与热加工物理模拟及数值模拟国际会议)

会议地点: 郑州

会议语种:英文

在线出版日期: 2007-10-23（万方平台首次上网日期，不代表论文的发表时间）