Magnetic tag process
AssigneeGeneral Electric Company
InventorsCasimir W. Krystyniak, Marcus P. Borom
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Abstract
Ferrite particles having a plurality of distinct Curie temperatures are encapsulated within a glass matrix to provide tagging material especially useful in identifying explosive materials even after detonation. In one embodiment, phosphor is dispersed within the glass matrix or an intrinsically fluorescent glass is employed to facilitate visual identification and collection of tag particles following detonation. The tags are also usable in tagging other articles, especially where harsh environmental conditions are likely to be encountered.
Claims12
A method for manufacturing a magnetic tag for identifying explosive compositions comprising the steps of:
- (A) homogenizing a mixture of ferrite, phosphor, and glass in a ball mill;
- (B) pressing the homogenized mixture into pellets;
- (C) sintering the pellets at a temperature slightly above the annealing temperature of the glass;
- (D) crushing the sintered pellets to form a powder;
- (E) flame-spraying the powder at a velocity and temperature sufficient to form smooth, spheroidal particles.
A method for manufacturing a magnetic tag for identifying explosive compositions comprising the steps of:
- (A) homogenizing a mixture of ferrite and glass in a ball mill;
- (B) mixing said mixture with a first wetting agent and a first binder;
- (C) agitating said mixture to form an agglomeration of spheroidal particles;
- (D) sintering said agglomeration on a non-wetted substrate at a temperature slightly above the annealing temperature of the glass to form spheriodal particles;
- (E) rolling said spheroidal particles in a phosphor rich glass powder to which a second wetting agent and a second binder have been added, to form a powder coat on said particles;
- (F) firing said coated particles at a temperature sufficient to convert the powder coat to a glaze.
A method for manufacturing a magnetic tag for identifying explosive compositions comprising the steps of:
- (A) homogenizing a mixture of ferrite, glass, and phosphor in a ball mill;
- (B) mixing said mixture with a wetting agent and a binder;
- (C) agitating said mixture to form an agglomeration of spheroidal particles;
- and
- (D) sintering said agglomeration on a non-wetted substrate at a temperature slightly above the annealing temperature of the glass to form spheroidal particles.
A method for manufacturing a magnetic tag for identifying explosive compositions comprising the steps of:
- (A) homogenizing a mixture of ferrite and inherently fluorescent glass in a ball mill;
- (B) mixing said mixture with a wetting agent and a binder;
- (C) agitating said mixture to form an agglomeration of spheroidal particles;
- and
- (D) sintering said agglomeration on a non-wetted substrate at a temperature slightly above the annealing temperature of the glass to form spheroidal particles.
Dependencies are inferred from the claim text.