Low softening point metallic oxide glasses suitable for use in electronic applications
First Claim
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1. A low softening point glass composition comprising 2 to 40% by wt. silver oxide, 12 to 40% by wt. vanadium oxide, and 35 to 75% by wt. tellurium oxide, and 2 to 30% by wt. lead oxide, wherein all percentages total 100.
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Abstract
This invention presents a series of glasses which possess low softening points, high resistance to recrystallization and good durability in the presence of moisture. The glasses are contained within oxides of silver, vanadium, tellurium, and lead and have glass transition temperatures below 260° C., and are useful in electronic applications such as die attach adhesives and sealing glasses.
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13 Claims
- 1. A low softening point glass composition comprising 2 to 40% by wt. silver oxide, 12 to 40% by wt. vanadium oxide, and 35 to 75% by wt. tellurium oxide, and 2 to 30% by wt. lead oxide, wherein all percentages total 100.
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5. A die attach adhesive composition consisting essentially of an admixture of
(a) a metal selected from the group consisting of silver, gold, and plantinum, and (b) a powdered, low softening point glass composition comprising 2 to 40% by wt. silver oxide, 12 to 40% by wt. vanadium oxide, 35 to 75% by wt. tellurium oxide, and 2 to 30% by wt. lead oxide, wherein all percentages total 100, having a peak firing temperature of 400° - C. or lower, wherein the ratio of (a)/(b) is 4;
1 to 100;
1. - View Dependent Claims (6, 7, 8, 9, 10)
- C. or lower, wherein the ratio of (a)/(b) is 4;
Specification