145. Effect of sulphur on the properties of carbon and graphite

✍ Scribed by J.F. Rakszawski

• Publisher: Elsevier Science
• Year: 1964
• Tongue: English
• Weight: 115 KB
• Volume: 1
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(64)90436-1

✦ Synopsis

polishing experiments, the two phase carbons could be classified into four groups according to the spread in the orientation of basal planes; (ii) For a given carbon, the polishing produced a characteristic surface orientation which was independent of any preferred orientation in the hulk; (iii) Under acceptable operating conditions on a slotted slip ring, the two phase materials, in general, possessed comparable surface orientation to that found in the simple polishing experiments. The surface orientation was apparently unaffected by the passage of current or polarity of brush; (iv) In those experiments which had to be discontinued (e.g. unacceptable friction, sparking etc.) it was generally observed that irrespective of brush composition the surface layers showed a random orientation;

(v) The friction of non-graphitic carbons under practical running conditions was not less than 0.2 (vi) The mean tilt of the basal planes (y) of about fifty commercial carbons was examined in relation to the coefficient of friction under operating conditions.

The simple relation p=tan y did not apply under these conditions.