Powders

Powders

1. Method for reducing particle size

   • Vibratory milling
   • Attrition milling
   • Jet milling
   • Ball milling
     • Advantages
       • Simple
       • Inexpensive
     • Disadvantages
       • Cannot produce ultrafine particles
       • Can add impurities
       • Less than 2% of the energy input intro creating new surfaces

2. Methods

   • Mechanival
   • Chemical
   • Vapor phase

3. Types of powders

   • Primary particles
   • Agglomerates
   • Particles
   • Granules
   • Flocs
   • Colloids
   • Aggregates