Effects of High-Temperature Exposure on Mechanical Properties of Thermal Sprayed CoNiCrAlY Alloy Coating(<Special Issue>Thermal Barrier Coating Systems for Gas Turbines)

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  • CoNiCrAlY溶射皮膜の機械的特性におよぼす高温暴露の影響(<小特集>ガスタービン用遮熱/耐環境コーティング技術)
  • CoNiCrAlY溶射皮膜の機械的特性におよぼす高温暴露の影響
  • CoNiCrAlY ヨウシャ ヒマク ノ キカイテキ トクセイ ニ オヨボス コウオン バクロ ノ エイキョウ

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Abstract

Thermal spraying is widely used in various industrial fields as effective surface modification method. In this study, mechanical properties of thermal sprayed CoNiCrAlY alloy coating were investigated. The coatings were prepared by three kinds of thermal spray methods. High-temperature exposure of the coated specimens was carried out in the atmosphere. After high-temperature exposure, apparent Young's modulus, strain tolerance, residual stress and hardness of the CoNiCrAlY coating were measured. These tests were also carried out using specimens without high-temperature exposure. As a result, the changes of mechanical properties caused by high-temperature exposure seemed to be correlated with properties of boundary between sprayed particles. From the results, effects of high-temperature exposure on mechanical properties of thermal sprayed CoNiCrAlY alloy coating were discussed.

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