CORROSION RESISTANT RAM POWDER
Assignee
MCDONNELL DOUGLAS CORPORATION, A MD CORP.
Filed
Mar 20, 1990
Granted
Feb 2, 1999
Location
SOUTH CHESTERFI MO US
Abstract
An iron-silicon compound powder whose predominant phases are Fe5Si3, Fe2Si and Fe3Si, which is useful as a radar absorbing material (RAM) in corrosive and oxidizing atmospheres and when used with corrosive or oxidizing binders is formed by a diffusion process. The powder is made in a process that includes blending magnetic materials such as carbonyl iron, iron cobalt, and/or nickel and very pure silicon powders with an activator, such as a halide salt, and then heating the mixture between 1350 DEG F. and 1600 DEG F. in an inert atmosphere. The result is then ground until it passes through a 200 mesh screen. The powder so formed usually is then heated in air. This forms a thin protective shell about each particle of the powder after which the powder can be combined with a suitable binder to form a RAM coating capable of operating at high temperatures which is relatively unaffected by corrosive atmospheres.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Apr 8, 1992
Rescinded
Dec 5, 1996
Duration
4 years, 8 months
Inventor
- 1EDWIN W. WIGGINS
Record Details
- Patent number
- US 5866273
- Application
- 07496322
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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