1.1 THIN LAYER DEPOSITION

• 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)