Browse Prior Art Database

Dielectric Glass Compositions

IP.com Disclosure Number: IPCOM000084337D
Original Publication Date: 1975-Oct-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Brownlow, JM: AUTHOR

Abstract

Existing glasses used in gas panel display devices, as the dielectric overcoat film, can be improved by adding zinc oxide, raising the aluminum oxide, and omitting calcium oxide, as shown below. By so doing, the resistance to weathering is increased and the thermal expansion coefficient is lowered.

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Dielectric Glass Compositions

Existing glasses used in gas panel display devices, as the dielectric overcoat film, can be improved by adding zinc oxide, raising the aluminum oxide, and omitting calcium oxide, as shown below. By so doing, the resistance to weathering is increased and the thermal expansion coefficient is lowered.

Typically, the thermal expansion coefficient of the dielectric overcoat film is larger than the thermal expansion coefficient of the underlying plate glass substrate. This thermal mismatch acts to put the dielectric overcoat film under stress upon cooling. Such stress will act to shorten the panel lifetime by causing leaks, breakdown, and the like.

The following glass composition, within the ranges indicated, has been found to exhibit a thermal expansion coefficient less than typical commercially available plate glass substrates. LOW RANGES HIGH

PbO 40 54 56

SiO(2) 8 14 17

Al(2)O(3) 5 8 11

B(2)O(3) 13 15 18

ZnO 5 10 11

Na(2)O 1.5 2 2.5

CaO 0 0 0

MgO 0 2 4

OR OR

Bi(2)O(3) 0 12.

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