Engineering Metallurgy by The Committee on Metallurgy

By The Committee on Metallurgy

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Such polymers mostly fall into one of two classes, thermoplastic and thermosetting. Thermoplastic adhesives are generally water-soluble and melt on heating. The thermosetting type, on the other hand, is set by a polymerization reaction which produces a hard film that is insoluble in water and does not melt on heating. Thermoplastic adhesives are used where flexibility is required; for joining fabrics, or for adhesive tape. Thermosetting polymers, on the other hand, are suitable for making relatively strong joints between parts of an industrial product.

2 Van der Waals forces There are two main types of intermolecular force that are covered by this generic title: polar and dispersion forces. Such forces result from the fact that in covalent chemical compounds or radicals the centre of gravity of the electrons, and that of the positive ions, do not necessarily coincide. If one of the ions is more electronegative than the others, then electrons will be attracted towards it. Hence there will be a gradient of space charge and an electric dipole will be set up.

The part is enclosed, typically in an evacuated steel can, and pressure is applied in such a way that the gas does not flow into the bonding area. Typical conditions are, for titanium, 900 0 C for 3 h at 100N mm" 2 and, for aluminium, 500 0C for 2h at 75 N mm" 2 . The pressures are higher than for uniaxial bonding and the requirements for surface finish are less stringent. 8 m. Other applications of diffusion bonding include the joining of Zircaloy-2 to depleted uranium for the encapsulation of nuclear fuel elements, hardfacing small-bore valves, and miniaturized heat exchangers.

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