Location

Brunswick, ME

Start Date

1-1-1990 12:00 AM

Description

Ceramic bearing balls have great potential for replacing steel bearing balls in most applications because of their lower weight, larger strength at high temperatures, and abundance of raw materials. However, ceramic materials are brittle, and the advantages of ceramic parts can be lost if small surface cracks and bulk defects are present in part. This work will report on a method we developed to detect small sub-micron surface cracks in ceramic bearing balls. We present a theory to calculate the scattering from these small “trenches” or cracks, and we will present an amplitude and phase measuring acoustic microscope capable of detecting these defects. We will present results of “line scans” across cracks in ceramics bearing balls where the balls are rolled under the stationary transducer.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

9B

Chapter

Chapter 9: Manufacturing and Process Control

Pages

2091-2096

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

A Sam Bearing Ball Inspection System

Brunswick, ME

Ceramic bearing balls have great potential for replacing steel bearing balls in most applications because of their lower weight, larger strength at high temperatures, and abundance of raw materials. However, ceramic materials are brittle, and the advantages of ceramic parts can be lost if small surface cracks and bulk defects are present in part. This work will report on a method we developed to detect small sub-micron surface cracks in ceramic bearing balls. We present a theory to calculate the scattering from these small “trenches” or cracks, and we will present an amplitude and phase measuring acoustic microscope capable of detecting these defects. We will present results of “line scans” across cracks in ceramics bearing balls where the balls are rolled under the stationary transducer.