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Title: Method for producing pellets for use in a cryoblasting process

A cryoblasting process having a centrifugal accelerator for accelerating frozen pellets of argon or carbon dioxide toward a target area utilizes an accelerator throw wheel designed to induce, during operation, the creation of a low-friction gas bearing within internal passages of the wheel which would otherwise retard acceleration of the pellets as they move through the passages. An associated system and method for removing paint from a surface with cryoblasting techniques involves the treating, such as a preheating, of the painted surface to soften the paint prior to the impacting of frozen pellets thereagainst to increase the rate of paint removal. A system and method for producing large quantities of frozen pellets from a liquid material, such as liquid argon or carbon dioxide, for use in a cryoblasting process utilizes a chamber into which the liquid material is introduced in the form of a jet which disintegrates into droplets. A non-condensible gas, such as inert helium or air, is injected into the chamber at a controlled rate so that the droplets freeze into bodies of relatively high density.
Inventors:
 [1];  [2]
  1. (Clinton, TN)
  2. (Heiskell, TN)
Issue Date:
OSTI Identifier:
871146
Assignee:
Lockheed Martin Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5666821
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Country of Publication:
United States
Language:
English
Subject:
method; producing; pellets; cryoblasting; process; centrifugal; accelerator; accelerating; frozen; argon; carbon; dioxide; target; utilizes; throw; wheel; designed; induce; operation; creation; low-friction; gas; bearing; internal; passages; otherwise; retard; acceleration; move; associated; removing; paint; surface; techniques; involves; treating; preheating; painted; soften; prior; impacting; thereagainst; increase; rate; removal; quantities; liquid; material; chamber; introduced; form; jet; disintegrates; droplets; non-condensible; inert; helium; air; injected; controlled; freeze; bodies; relatively; density; cryoblasting process; frozen pellets; controlled rate; process utilizes; liquid material; carbon dioxide; centrifugal accelerator; liquid argon; wheel designed; inert helium; throw wheel; internal passage; producing pellets; accelerating frozen; accelerator throw; /62/

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