30-05-2012, 04:24 PM
Material Science
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Diffusion
Mass Transfer (Atomic) e.g. Migration
Mechanisms
- In Gases & Liquids via Brownian Motion
- In Solids via Vacancy or Interstitial Diffusion
Diffusion in Solids
- Condition: Empty Sites, Atomic Size, Energy
- Extent: Vibrational Magnitude, Temperature
Diffusion in Metals
- Vacancy: High temp, Position exchanges
- Interstial: Smaller atoms (H,C,N and O)
Importance
- Purification of gases - Case Hardening
- IC Chips Fabrication