Relations between Mechanical Properties of Thermal-Sprayed Ceramic Coatings and Substrate Temperature during Deposition
Hideaki YAMANO, Takeshi TAKABATAKE, Kazumi TANI
Journal of Solid Mechanics and Materials Engineering
Abstract
Thermal spraying is widely used in various industrial elds as eective surface modi- cation method. However, the coating failures such as cracking, debonding and spalla- tion occur due to external loading or internal stress induced by the mismatch of material properties between coating and substrate, and these become a major problem. In this study, mechanical properties of thermal-sprayed ceramic coatings were investigated. Al2O3 and Y2O3-stabilized ZrO2 (YSZ) coatings were deposited on plate substrates. Stainless steel plates and aluminum plates, of dierent thermal expansion coecients, were used as substrates. The coatings were prepared at two dierent thicknesses. Dur- ing deposition of each specimen, the history of substrate temperature was recorded. Four-point bending tests were carried out, while strains at the coating surface and the substrate surface were measured with strain gages. The apparent Young s modulus of the coating was determined using the composite beam theory. Subsequently, the rup- ture strain of the coating was measured by a three-point bending test. In addition, the residual stresses of the coating were determined by mechanical polishing. The rela- tionships between the results of these tests and the each substrate temperatures during deposition were discussed.
keywords:Mechanical property; Strain Gage; Young’s modulus; Residual stress; Al2O3; Atmospheric plasma spraying; Y2O3 Stabilized ZrO2; Rupture Strain
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