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 electrical conductivity and thermal expansion properties of beryllium bronze against other materials.
| Identifier | ExFiles\Box 149\4\ scan0341 | |
| Date | 31th May 1937 guessed | |
| - 3 - ELECTRICAL CONDUCTIVITY. The electrical conductivity of beryllium bronze varies with the Be. content and also with the heat-treatment accorded to the specimen in question. The 2.5 per cent Be. alloy in the condition of optimum heat-treatment has the electrical conductivity shewn below and compared with other common materials of construction:- - At 18°C. - Electrolytic Copper ............... 100 per cent. Beryllium Bronze ................ 32 " " Phosphor Bronze(5/6%Sn{Mr Sanderson}, 0.1% P.)......... 14 per cent. Brass (70/30) .................... 25 " " (Al. Bronze (10% Al.) ................ 15 " " ( and alloys of this class.) Iron (pure).................... 15 per cent. Steel (0.1% C.) ................. 9 " " Aluminium (pure) ................ 58 per cent. Duralumin 'B' and ) ................ 20 per cent. alloys of this class.) CO-EFFICIENT OF THERMAL EXPANSION. The linear co-efficient of thermal expansion of beryllium bronze does not differ appreciably from that of other alloys of about the same copper content. The figures below state the values for various materials at temperatures of about 18 - 20°C. The units are centimetres per degree C. Over............. | ||