Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1990-04-19
1991-07-09
Dixon, Jr., William R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
428692, 428694, 428900, 252 6259, C25F 500
Patent
active
050303325
ABSTRACT:
A mixture including at least one iron oxide and a mon-magnetic matrix material is melted or vaporized and then heat is rapidly removed from the material. The resulting magnetic oxide precipitates are densely packed in the non-magnetic matrix. The precipitates have a narrow particle size distribution which results in a high signal-to-noise ratio when the oxides are used for magnetic recording purposes. The non-magnetic matrix can be removed to yield homogeneous, small particle iron oxide containing magnetic powder. Alternatively, the non-magnetic matrix/iron oxide material can be processed to yield a shaped recording medium.
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Averbach Benjamin L.
Henderson Laura J.
O'Handley Robert C.
Dixon Jr. William R.
Gallo Chris
Massachusetts Institute of Technology
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