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Fusion seal and sealing mixtures
| Details |
Inventors: Morena, Robert;
Assignee: Corning Incorporated (Corning, NY)
Primary Examiner: Group; Karl
Assistant Examiner: Sample; David
Attorney, Agent or Firm: Peterson; Milton M.
A fusion seal between two surfaces, and a material to produce the seal, consist essentially of 60-90 percent by weight of a SnO--ZnO--P.sub.2 O.sub.5 glass frit and 10-40 percent by weight of a mill addition including alumina and, optionally, zircon, the alumina content being at least 10% when it constitutes the mill addition and not over 20% in conjunction with zircon, 0-15 % of a further additive that reduces the effective CTE of the seal, the mill addition being present in a sufficient amount to cause a substantial change in viscosity-temperature characteristics of the material after formation of a seal. The effect of the mill addition on viscosity in a fusion seal finds particular application in uniting the faceplate and funnel members to form a cathode ray tube envelope. |
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DETAILED DESCRIPTION My invention resides in part in a fusion seal between the surfaces of two bodies, the fusion seal consisting essentially by weight of 60-90% of a SnO--ZnO--P.
sub.
2 O.
sub.
5 glass and 10-40% of a mill addition comprising alumina and, optionally, zircon, the alumina content being at least 10% when it constitutes the mill addition and not over 20% in conjunction with zircon, the total content of alumina and zircon being 10-40%, the seal having a phosphate crystal phase crystallized in situ which, in combination with the mill addition, causes a substantial change in the viscosity temperature characteristics of the seal.
The invention further resides in a fusion sealing material consisting essentially by weight of 60-90% of a SnO--ZnO--P.
sub.
2 O.
sub.
5 glass frit mixed with 10-40% of a mill addition comprising alumina and, optionally, zircon, the alumina content being at least 10% when it constitutes the mill addition and not over 20% in conjunction with zircon, the total of alumina and zircon being 10-40%, the sealing material being capable of thermal treatment to develop a phosphate crystal phase that substantially changes the effective viscosity-temperature characteristics in a seal formed from the material whereby the seal does not soften on reheating.
The invention also resides in a method of producing a cathode ray tube envelope which comprises mixing 10-40% by weight of a mill addition with 60-90% by weight of a SnO--ZnO--P.
sub.
2 O.
sub.
5 sealing glass flit, the mill addition comprising alumina and, optionally, zircon, the alumina content being at least 10% when it constitutes the mill addition and not over 20% in conjunction with zircon, the total content of alumina and zircon being 10-40%, applying the mixture of glass and mill addition between the peripheral surfaces of funnel and faceplate members, heating the assembly to sealing temperature to produce a seal and to initiate crystallization of a phosphate phase, cooling and subsequently reheating the sealed envelope under vacuum to a bake-out temperature
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Nonmetallic Processes 
