Coating of particles
AssigneeUnited Kingdom Atomic Energy Authority
InventorsStuart R. Brown, Eric A. Feest, Fred Leach
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Abstract
The invention relates to the coating of particles for use, for example, as inoculants in the metallurgical field. A fluidized bed of metallic-particles (e.g. Fe/Si, Fe/Mn of size range 50 .mu.m to 3000 .mu.m or higher) is contacted with a wash-coat comprising a suspension of a non-dispersible ceramic powder in a sol (e.g. a suspension of Al(OH).sub.3 powder in a boehmite sol). Subsequent controlled drying and firing produces a ceramic coating on the particles which has good adhesion and thermal stability and whose thickness and density can readily be controlled.
Claims5
A method of coating metallic-particles with a ceramic material which comprises generating a fluidised bed of metallic-particles;
- contacting the metallic-particles in the bed with a wash-coat comprising a suspension of a non-dispersible ceramic powder in a sol of colloidal-particles convertible to the ceramic material thereby to coat the metallic-particles with the ceramic-particles and the colloidal-particles;
- and subsequently firing to produce a coating of the ceramic material.
Dependencies are inferred from the claim text.