Location

Brunswick, ME

Start Date

1-1-1997 12:00 AM

Description

Elastic properties of high-performance ceramics is usually measured with ultrasonic bulk waves [1]. However, the bulk waves gives us only properties averaged over sample thickness. Sintered ceramics often have properties at the surface different from in the middle. Thus we need a method which distinguishes near surface property from the averaged one. Surface wave technique has been applied for nondestructive characterization of ceramics [2–4]. The depth-dependent properties of ceramics, however, has never been reported. Surface wave propagates in subsurface layer of about one wavelength. Therefore we’ll be able to estimate the depth-dependent properties of the ceramics, if we’ll use surface waves of different frequency or wavelength.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

16B

Chapter

Chapter 6: Material Properties

Section

Materials Characterization

Pages

1509-1515

DOI

10.1007/978-1-4615-5947-4_196

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Nondestructive Evaluation of Surface Properties of Sintered Si3N4 Ceramics with Surface Wave Dispersion

Brunswick, ME

Elastic properties of high-performance ceramics is usually measured with ultrasonic bulk waves [1]. However, the bulk waves gives us only properties averaged over sample thickness. Sintered ceramics often have properties at the surface different from in the middle. Thus we need a method which distinguishes near surface property from the averaged one. Surface wave technique has been applied for nondestructive characterization of ceramics [2–4]. The depth-dependent properties of ceramics, however, has never been reported. Surface wave propagates in subsurface layer of about one wavelength. Therefore we’ll be able to estimate the depth-dependent properties of the ceramics, if we’ll use surface waves of different frequency or wavelength.