62.1 THIN LAYER DEPOSITION

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Thin layers can be mixed into surfaces using electron and laser beams,

1. A thin layer is deposited on a surface with other techniques,

a) electrostatic vapor deposition

b) a thin sheet is applied

c) the material is delivered as the beams work

2. A laser or electron beam melts the surface and mixes the two materials

The rates can be greater than 1 m/s

Advantages,

- radiation penetration is shallow

- no chemical contamination

- no gas or jets to disturb molten surface

- high precision for delivery

- automation is possible

Disadvantages,

- high capitol cost

- beams narrow, so multiple passes required (slow)