Evaluation of the Al<sub>2</sub>O<sub>3</sub> Coating by Ultrasonic Wave Propagation Character

CHANG Jun-jie. Evaluation of the Al2O3 Coating by Ultrasonic Wave Propagation Character[J]. Materials and Mechanical Engineering, 2007, 31(2): 62-64.

Citation:

CHANG Jun-jie. Evaluation of the Al2O3 Coating by Ultrasonic Wave Propagation Character[J]. Materials and Mechanical Engineering, 2007, 31(2): 62-64.

Citation:

CHANG Jun-jie. Evaluation of the Al2O3 Coating by Ultrasonic Wave Propagation Character[J]. Materials and Mechanical Engineering, 2007, 31(2): 62-64.

Evaluation of the Al₂O₃ Coating by Ultrasonic Wave Propagation Character

Abstract

A method was proposed to extend the limit of the traditional bulk ultrasonic pulses for the evaluation of material properties of a coating.The extension was accomplished by introducing the concept of the group delay spectrum.The acoustic impedance and the density for the coating can be derived easily by a group delay analysis.Then the method was applied to the analysis of Al2O3 coating.

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