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).
Letter to Albion Motors Ltd. detailing the composition and characteristics of AC.9 Aluminium-tin bearing material.
| Identifier | ExFiles\Box 115\5\ scan0046 | |
| Date | 27th May 1938 | |
| R.R. FR/EHF. Attention of Mr. MacDonald. Messrs. Albion Motors Ltd., Scotstoun, Glasgow. 27th May, 1938. Dear Mr. MacDonald, We were very pleased to have the opportunity of showing you round our Works, and we are sure you will quite appreciate that we do take very seriously the production of not only piston rings, which at all times may be regarded as the first-grade job, but that we have also equipped ourselves in a very efficient manner for the production of Aluminium-alloy pistons, and we are quite confident that we shall be able to supply you with pistons which we think will in every way meet with your approval and satisfaction. Regarding the subject of the RR. Aluminium-tin bearing material, the following are the general particulars referring to analysis and physical characteristics, together with fitting details to make a successful application of the Aluminium-tin bearing. AC.9. — Composition. Tin 5.3 -6.0 Nickel 1.5-1.8 Copper 0.8-0.9 Magnesium 0.7-1.0 Silicon 0.2-0.4 Iron 0.2-0.4 The maximum Brinell is about 65, the general figure being about 50 to 65 Brinell. The specific gravity is about 2.95 to 3.00. The co-efficient of expansion 0°C. to 150°C. (.0000225). The heat conductivity about 37 c.g.s. units which is three times that of steel, and five times that of normal Babbitt. The anti-corrosion properties are very good, as indicated by exposure to air, etc., nor is it liable | ||