Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1989-04-10
1991-03-26
Niebling, John F.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427217, 427251, 4272555, 118716, 149 5, 149 76, 44500, 44501, 428403, C23C 1418, C23C 1426
Patent
active
050027972
ABSTRACT:
Aluminum-coated ammonium perchlorate is prepared in an apparatus consisting f a four-opening reaction flask (which serves as a vacuum chamber). The reaction flask is fitted with an electrically-heated tungsten helix coil (for vaporizing the aluminum), a mercury diffusion pump, a mechanical vacuum pump, a dry ice-acetone-cooled trap, and a McLeod pressure-measurement gage. The heater electrodes are submitted through two of the openings; reduced pressure operation is maintained through the third opening, and the aluminum is fed through the fourth opening. The reaction flask is operated at approximately 10 Torr. A magnetic stirrer permits the ammonium perchlorate to be vaporized onto the surface of the ammonium perchlorate after the melted aluminum on the tungsten helix coil is subsequently vaporized from the tungsten helix coil. The aluminum-coated ammonium perchlorate is tested in a solid composite propellant composition wherein it increases the propellant's burning rate, extends the storage life of interceptor motor containing the solid composite propellant composition, and improves the solid composite propellant composition mechanical properties. The percentage coating varies from about one percent to about four percent depending on particle size of ammonium perchlorate. Although, only approximately 10% of the ammonium perchlorate particles are coated, the burning rate increase, the benefits to shelf life, and improved mechanical properties are significant.
REFERENCES:
patent: 3953256 (1976-04-01), Schwarz et al.
patent: 4353938 (1982-12-01), Sterling et al.
Bush Freddie M.
Deaton James T.
Niebling John F.
Ryser David G.
The United States of America as represented by the Secretary of
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