Flexible pipe element for exhaust gas system of passenger car, has film made of three layers and formed as hollow cylinder between flexible inner tube and flexible, gas-tight cladding part, where exhaust gas flows via inner tube

摘要

The pipe element has a film made of three layers (13-15), where the radially interior layer (13) has lubricating properties under high temperatures. The film is formed as a hollow cylinder between a flexible inner tube (11) and a flexible, gas-tight cladding part. Exhaust gas flows via the tube, and the cladding part is a metallic bellow (12) with corrugations. The properties are provided by knitted elements made of stainless steel fibers and graphite fibers, aluminum oxide based precursor coated fibers, preceramic polymer in firm, gel-like or foam-like texture and metallic-textile composites.