Cook-off coating
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorDonald P. Crowley
Life of this patent
Estimating the term…
Abstract
A flexible composite sheet coating for providing cook-off protection time r rocket motors, etc., comprising intumescent material in liquid form including mica flakes sprayed in sequence onto aluminum foil and glass cloth and bonded to the wall of a rocket structure.
Claims23
An ablative and flexible high strength insulative cook-off coating composite-sheet for providing a heat transfer inhibiting barrier as protection against fire and high temperatures, comprising:
- a. a metal foil substrate having one surface thereof operable to be affixed to a device to be protected from excess heat;
- b. a first layer of intumescent composition material adjacent to and affixed to the other surface of said metal foil substrate;
- c. a glass cloth reinforcement layer having one side thereof affixed to the surface of said first layer of intumescent material;
- d. a second layer of intumescent material affixed to the other side of said glass cloth;
- said second layer of intumescent material being of greater thickness than said first layer;
- e. said glass cloth reinforcement layer being embedded between said first and second layers of intumescent material;
- said glass cloth reinforcement layer being operable to strengthen said flexible composite-sheet and prevent fissuring of the intumescent material layers upon charring of the intumescent material and prevent char failure of said composite-sheet due to flame and high temperatures produced by combustion of rocket propellants and the like;
- f. said composite layers of aluminum foil, intumescent composition material and glass cloth being flexible and providing an ablative insulating covering which inhibits heat transfer and provides insulation for safety purposes over a desired period of time;
- said period of time operable to be varied by varying the overall thickness of the composite-sheet, particularly the overall thickness of said first and second intumescent material layers.
In a rocket motor casing, an ablative and flexible composite-sheet covering which provides a high thermal barrier cook-off coating as a protection against flame and high temperatures comprising:
- a. a metal foil substrate having one surface affixed by an adhesive layer to the exterior surface of said rocket motor casing;
- b. a first layer of intumescent composition material affixed to the other surface of said metal foil substrate;
- c. a glass cloth reinforcement layer having one side thereof affixed to said first layer of intumescent material;
- d. a second layer of intumescent material affixed to the other side of said glass cloth reinforcement layer;
- e. said glass cloth reinforcement layer being embedded between said first and second layers of intumescent material;
- said glass cloth reinforcement layer being operable to strengthen said flexible composite-sheet and prevent fissuring of the intumescent material layers upon charring of the intumescent material and prevent char failure of said composite-sheet due to flame and high temperature produced by combustion of rocket propellants and the like;
- f. said composite-sheet covering of layers of aluminum foil, intumescent composition material and glass cloth providing a protective insulating covering which inhibits heat transfer and prevents thermal deterioration in the zone of said adhesive layer for safety purposes over a desired time period of exposure to flame or high temperatures;
- said time period operable to be varied by varying the overall thickness of said composite-sheet covering, particularly the overall thickness of said first and second intumescent material layers.
Dependencies are inferred from the claim text.