cryomilling
otherwise
freeze grinding; cryogemic grinding
(rus. криопомол otherwise криоизмельчение)
—
mechanical pulverisation of solids at low temperatures, up to the boiling point of liquid nitrogen (77 K).
Description
A significant increase in the brittleness of substances and materials at cryogenic temperatures allows the pulverisation of solids that demonstrate plastic behaviour at room temperature (rubber, lead), and significantly reduces the particle size in the pulverisation of brittle materials. This is one of the most effective ways of obtaining nanopowders.
Illustrations
|
Modern low-temperature micromill (Retsch).
|
Author
- Shlyakhtin Oleg A.
Sources
- U. S. patent No. 692 339 2 from 02.08.2005, Freezegrinding method of the waste materials using the cooled air. — www.freepatentsonline.com/6923392.html (reference date: 12.12.11).
- U. S. patent No. 377 172 9 from 13.11.1973. Cryogenic comminution system. — www.freepatentsonline.com/3771729.html (reference date: 12.12.11).
- SPEX 6870 Freezer // Mill. — www.spexcsp.com/sampleprep/catalog/aid2tid3did54.html (reference date: 12.12.11).
- Retsch Cryomill. — www.retsch.com/products/milling/mixer-mills/cryomill/ (reference date: 12.12.11).
- Pjagajj R.N. Influence of cryomilling on solid bodies (in Russian). Dissertation. ... PhD in Chemistry. — Moscow.: MGU, 1982.