Method for providing ceramic lining to a hollow body by thermit

Details Method for providing ceramic lining to a hollow body by thermit Method for providing ceramic lining to a hollow body by thermit

1980-11-06

1982-12-14

Derrington, James H.

Coating processes

Solid particles or fibers applied

Interior or hollow article coating

264 60, 264102, 264311, 427201, 427229, 427234, 427241, 427295, 427405, B05D 722

Patent

active

043638325

ABSTRACT:
The invention provides a novel method for forming a ceramic lining layer on the inward surface of a hollow body such as a pipe. According to the invention, a thermit mixture, for example, composed of aluminum powder and an iron oxide is placed in the hollow space of the hollow body, which is rotated at a high speed so as that the thermit mixture is pressed against the wall of the hollow body by the centrifugal force and the thermit mixture is ignited, for example, by contacting with an acetylene flame. The thermit reaction of the thermit mixture propagates under the influence of the centrifugal force so that the molten metal formed from the reducible metal oxide and the ceramic oxide formed from the strongly reductive element are separated into stratified layers by virtue of their density difference with the ceramic oxide forming the innermost layer and the metal forming the intermediate layer between the ceramic oxide layer and the wall of the hollow body with strong bonding of the ceramic oxide layer upon solidification by cooling.

REFERENCES:
patent: 3551188 (1970-12-01), Lindquist
patent: 3974306 (1976-08-01), Inamura et al.
patent: 4048352 (1977-09-01), Pignocco et al.
patent: 4117868 (1978-10-01), Pignocco et al.
patent: 4142556 (1979-03-01), Pignocco et al.
patent: 4150182 (1979-04-01), Pignocco et al.

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