Lesson_3 Plastics and ceramics (13)

Lesson_3 Plastics and ceramics (13) - 17-8 Examples and...

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atom-to-atom contact, and permits the two surfaces to be joined. Explosive bonding can also be used. An explosive charge provides the pressure required to join metals. This process is particularly well suited for joining very large plates that will not fit into a rolling mill. Very simple laminar composites, such as coaxial cable, are produced by coextruding two materials through a die in such a way that the soft material surrounds the harder material. Metal conductor wire can be coated with an insulating thermo- plastic polymer in this manner. Brazing can join composite plates (Chapter 9). The metallic sheets are separated by a very small clearance—preferably, about 0.0075 cm—and heated above the melting temperature of the brazing alloy. The molten brazing alloy is drawn into the thin joint by capillary action. 17-8 Examples and Applications of Laminar Composites The number of laminar composites is so varied and their applications and intentions are so numerous that we cannot make generalizations concerning their behavior. Instead we will examine the characteristics of a few commonly used examples. Laminates Laminates are layers of materials joined by an organic adhesive. In lami- nated safety glass, a plastic adhesive, such as polyvinyl butyral (PVB), joins two pieces of glass; the adhesive prevents fragments of glass from flying about when the glass is broken (Chapter 15). Laminates are used for insulation in motors, for gears, for printed circuit boards, and for decorative items such as Formica 1 countertops and furniture. Microlaminates include composites composed of alternating layers of aluminum sheet and fiber-reinforced polymer. Arall (aramid-aluminum laminate) and Glare (glass- aluminum laminate) have been developed as possible skin materials for aircraft. In
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  • Spring '14
  • Colombo
  • Physics, Material Science, Plastics, Manufacturing, Metals, Aluminium, Laminate, Corrugated fiberboard, Aluminium alloy, Laminar Composites, Laminated glass

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