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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Comparison of the properties and composition of tin-base and lead-bronze bearing materials.

Identifier  ExFiles\Box 115\5\  scan0215
Date  6th December 1938 guessed
  
4.

without causing serious damage to the journal and without affecting the bearing surface to any great extent, also considerable dirt can be embedded in the surface without undue scoring of the steel journal. Mention, however, has already been made of efficient filtering to prevent this condition.

Another mark of superiority is its resistance to corrosion. It is not attacked by acids formed from oxidation during running. Briefly then, tin-base bearings are used whenever possible [text has a strikethrough] except in circumstances where [handwritten insertion] resistance to high temperatures [/handwritten insertion] higher fatigue life or mechanical strength is needed. Prog [handwritten]

Referring to Lead Bronze bearings we find that Lead Bronze mixtures usually range from 30/45% lead to the remainder Copper. They are mixtures because lead will not alloy with copper above a fraction of 1 per cent and small amounts of additional elements may be used by some manufacturers. These mixtures do not follow the orthodox metallurgical structure, because it has been found that the best bearings have the copper in the continuous phase for a matrix to give high fatigue life and the lead is contained in the "pores" to give the anti-score quality.
  
  


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