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Title: Sealing glasses for titanium and titanium alloys

Barium lanthanoborate sealing-glass compositions are provided comprising various combinations (in terms of mole-%) of boron oxide (B.sub.2 O.sub.3), barium oxide (BaO), lanthanum oxide (La.sub.2 O.sub.3), and at least one other oxide selected from the group consisting of aluminum oxide (Al.sub.2 O.sub.3), calcium oxide (CaO), lithium oxide (Li.sub.2 O), sodium oxide (Na.sub.2 O), silicon dioxide (SiO.sub.2), or titanium dioxide (TiO.sub.2). These sealing-glass compositions are useful for forming hermetic glass-to-metal seals with titanium and titanium alloys having an improved aqueous durability and favorable sealing characteristics. Examples of the sealing-glass compositions are provided having coefficients of thermal expansion about that of titanium or titanium alloys, and with sealing temperatures less than about C., and generally about C. The barium lanthanoborate sealing-glass compositions are useful for components and devices requiring prolonged exposure to moisture or water, and for implanted biomedical devices (e.g. batteries, pacemakers, defibrillators, pumps).
 [1];  [1];  [1];  [2]
  1. (Albuquerque, NM)
  2. (Rolla, MO)
Issue Date:
OSTI Identifier:
Sandia Corporation (Albuquerque, NM) SNL
Patent Number(s):
US 5648302
Contract Number:
Research Org:
Country of Publication:
United States
sealing; glasses; titanium; alloys; barium; lanthanoborate; sealing-glass; compositions; provided; comprising; various; combinations; terms; mole-; boron; oxide; bao; lanthanum; selected; consisting; aluminum; calcium; cao; lithium; sodium; na; silicon; dioxide; sio; useful; forming; hermetic; glass-to-metal; seals; improved; aqueous; durability; favorable; characteristics; examples; coefficients; thermal; expansion; temperatures; 900; degree; 700; -800; components; devices; requiring; prolonged; exposure; moisture; water; implanted; biomedical; batteries; pacemakers; defibrillators; pumps; sealing-glass compositions; glass-to-metal seals; sealing glasses; lithium oxide; titanium alloy; glass compositions; boron oxide; calcium oxide; aluminum oxide; thermal expansion; provided comprising; glass composition; titanium dioxide; silicon dioxide; sodium oxide; titanium alloys; various combinations; medical device; oxide selected; metal seal; medical devices; sealing glass; forming hermetic; lanthanum oxide; lanthanoborate sealing-glass; glass-to-metal seal; hermetic glass; metal seals; barium oxide; /501/428/