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Glasses for Use With Ferrite Recording Heads

IP.com Disclosure Number: IPCOM000082958D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Tummala, RR: AUTHOR [+2]

Abstract

These glasses are particularly useful for sealing ferrites in the fabrication of ferrite recording heads. Table I glasses (Example A-E) are valuable because of their relatively low softening temperatures (Ts) in the range of 669 degrees C to 704 degrees C, for the thermal coefficient of expansion (TCE) of 78.3 to 57.2 x 10/-7/ Degrees C. Table I Glass A B C D E SiO(2) 17.9 14.1 12.3 16.6 10.4 B(2)O(3) 27.2 28.0 29.2 23.4 29.0 PbO 0 0 0 0 0 CaO 3.3 2.7 2.2 3.7 2.1 BaO 45.7 47.8 50.4 50.5 49.8 Al(2)O(3) 5.7 7.2 5.8 5.6 8.6 ZnO 0 0 0 0 0 SrO 0 0 0 0 0 AS(2)O(3) 0.2 0.2 0.1 0.2 0.1 TCE @R.T. 78.3 82.8 84.6 87.2 80.7 -300 degrees C Ts(degrees 704 689 680 68 9 669 C)

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Glasses for Use With Ferrite Recording Heads

These glasses are particularly useful for sealing ferrites in the fabrication of ferrite recording heads. Table I glasses (Example A-E) are valuable because of their relatively low softening temperatures (Ts) in the range of 669 degrees C to 704 degrees C, for the thermal coefficient of expansion (TCE) of 78.3 to 57.2 x 10/-7/ Degrees C. Table I Glass A B C D E SiO(2) 17.9 14.1 12.3
16.6 10.4 B(2)O(3) 27.2 28.0 29.2 23.4 29.0 PbO 0 0 0 0 0 CaO
3.3 2.7 2.2 3.7 2.1 BaO 45.7 47.8 50.4 50.5 49.8 Al(2)O(3) 5.7 7.2 5.8
5.6 8.6 ZnO 0 0 0 0 0 SrO 0 0 0 0 0 AS(2)O(3) 0.2
0.2 0.1 0.2 0.1 TCE @R.T. 78.3 82.8 84.6 87.2 80.7 -300 degrees C Ts(degrees 704 689 680 68 9 669 C)

Table II glasses (Examples F and G) have a relatively higher TCE for a reasonably low-softening temperature. Table II Glass F G SiO(2) 18.6
17.5 B(2)O(3) 23.3 23.4 PbO 13.9 7.0 CaO 3.6 3.6 BaO 34.5
42.5 Al(2)O(3) 5.9 5.8 ZnO 0 0 SrO 0 0 AS(2)O(3) 0.2 0.2 TCE @R.T. 76.3 83.5 -300 degrees C Ts 690 688 (degrees C).

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