Method for making glass-ceramics with ferrimagnetic surfaces

Details Method for making glass-ceramics with ferrimagnetic surfaces Method for making glass-ceramics with ferrimagnetic surfaces

1977-01-07

1978-04-11

Fisher, Richard V.

Glass manufacturing

Processes

Operating under inert or reducing conditions

65 33, 106 397, C03B 3200, C03C 322

Patent

active

040837092

ABSTRACT:
This invention relates to the manufacture of glass-ceramic articles having integral surface layers exhibiting ferrimagnetic behavior. More specifically, this invention is directed to glass bodies having compositions within the Li.sub.2 O-Al.sub.2 O.sub.3 -Fe.sub.2 O.sub.3 -SiO.sub.2 -TiO.sub.2 base system, and that additionally contain NiO and/or CoO, which, when heat treated under oxidizing conditions to effect crystallization in situ to glass-ceramic articles, spontaneously develop crystallites of NiFe.sub.2 O.sub.4 and/or CoFe.sub.2 O.sub.4 in the surfaces thereof. The ferrite surfaces can be magnetized in a strong magnetic field and demonstrate magnetic properties eminently suitable for the recording, storage, and erasing of information.

REFERENCES:
patent: 3962514 (1976-06-01), Rittler
patent: 4030903 (1977-06-01), Rittler

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