62.1 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
Disadvantages,
- beams narrow, so multiple passes required (slow)
