Analytical Ferrography

Definition

Analytical Ferrography can predict potential equipment failures or be an effective tool in determining the root cause of failure. AF is a qualitative, rather than quantitative, analysis that provides digital imagery of the actual particles present. Powerful magnets trap the ferrous particles. Non-ferrous particles and other wear debris particles are then deposited randomly on slides for microscopic analysis. Particles are analyzed based on metallic or non-metallic, alloy via heat treatment, shape, size, color, and if possible, source.

Standard Test Method Used

POLARIS Method

Reporting Measurement

Picture - digital imagery at 100x, 500x or 1,000x with severity levels 1-4 assigned to each wear or wear debris category

Amount of Sample Needed

2 mL

Test Limitation

Results are subjective based on the knowledge and experience of the data analyst and dependent on the detail of information provided with the sample.

(click on image for larger version)

Sample Results

Abrasive Wear

Cutting Wear

Heat Treating

Spalling

Spheres

Black/Red Oxides