| 摘要 |
1,085,727. Moulding P.T.F.E.; laminates. RICHARD KLINGER Ltd. Feb. 23, 1966 [April 6, 1965], No. 14536/65. Headings B5A and B5N. An article of sintered P.T.F.E. is made by forming a layer of granular P.T.F.E. and a layer of refractory particles bound with an inorganic binder which carbonizes below 385‹ C. The two layers are pressed together whilst cold to form a physically adherent bond therebetween and the whole is then sintered at an elevated temperature below 385‹ C. to form the required article. The refractory particles may be non-metallic oxidic material or siliceous material, e.g. silica, sand or asbestos, or a refractory metal or metal alloy, e.g. iron, steel, copper, tin, zinc, bronze or brass, and the sintered article may be bonded on to a substrate of, e.g. glass or metal using a suitable adhesive, e.g. " Araldite " (Trade Mark). In the given example a " Duralumin " (Trade Mark) plate was coated with a film of " Castrol " (Trade Mark) and sand or iron filings sprayed thereon, the excess then being removed. The plate was then placed sand downwards on to a mould filled with P.T.F.E. particles and pressure applied to the plate. The composite article thus formed was removed from the mould and the plate and was heated for 36 hours at 380‹ C. The sintered article could be bonded to a plate of glass. |
