Alkali-free sealing glasses for molybdenum
US4298388A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 8, 1980 |
| Grant date | Nov 3, 1981 |
| Priority date | — |
| Expiry date | Oct 8, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C27/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
SiO.sub.2 -Al.sub.2 O.sub.3 -alkaline earth oxides glass compositions suitable for glass/molybdenum sealings with high thermal load capability, having coefficients of thermal expansion in the temperature range of 20.degree.-300.degree. C. of 4.6-5.1.times.10.sup.-6 /.degree. C., glass transformation temperatures (Tg) of 775.degree.-810.degree. C., softening temperatures (Ew) greater than 930.degree. C., processing temperatures (V.sub.A) of 1232.degree.-1273.degree. C. and at length of V.sub.A -Ew greater than 300.degree. C. as regards processing technology of these glasses in the mixture, which consist essentially of the following components, computed as percent by oxide weight: ______________________________________ SiO.sub.2 57.00-64.00 wt % Al.sub.2 O.sub.3 12.50-16.50 wt % ZrO.sub.2 1.00-5.50 wt % Al.sub.2 O.sub.3 + ZrO.sub.2 15.00-19.00 wt % CaO 11.50-19.20 wt % BaO 0-6.50 wt % CeO.sub.2 0-8.00 wt % TiO.sub.2 0-4.50 wt % CaO + BaO + CeO.sub.2 + TiO.sub.2 18.60-25.70 wt % and As.sub.2 O.sub.3 0-0.30 wt % ______________________________________
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.