Accession Number:

AD0613643

Title:

THE METALLOGRAPHY OF PYROLITIC GRAPHITE,

Descriptive Note:

Corporate Author:

ARMY MATERIALS RESEARCH AGENCY WATERTOWN MASS

Personal Author(s):

Report Date:

1964-12-01

Pagination or Media Count:

19.0

Abstract:

Etching of pyrolytic graphite by both argon ion bombardment and mercury ion bombardment is described. The difference between the microstructures revealed by the two methods is discussed, and an interpretation is suggested. Argon ion bombardment creates a leaf-like pattern reminiscent of stacked shingles. Mercury ion bombardment reveals a laminar structure unlike that produced by argon ion bombardment. Electrochemical polishing and etching reveals microstructures similar to those created by ion bombardment. Using an electrolyte based on phosphoric acid, microstructures similar to those resulting from mercury ion bombardment are revealed. Replacing the phosphoric acid with nitric acid results in microstructures similar to those obtained by argon ion bombardment. Based on the correlation between microstructures developed by ion bombardment and electrochemical etching, it is concluded that the microstructures revealed represent the true structure. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE