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High thermal expansion, sealing glass

Patent ·
OSTI ID:869016
 [1];  [1]
  1. Albuquerque, NM
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A glass composition for hermetically sealing to high thermal expansion materials such as aluminum alloys, stainless steels, copper, and copper/beryllium alloys, which includes between about 10 and about 25 mole percent Na.sub.2 O, between about 10 and about 25 mole percent K.sub.2 O, between about 5 and about 15 mole percent Al.sub.2 O.sub.3, between about 35 and about 50 mole percent P.sub.2 O.sub.5 and between about 5 and about 15 mole percent of one of PbO, BaO, and mixtures thereof. The composition, which may also include between 0 and about 5 mole percent Fe.sub.2 O.sub.3 and between 0 and about 10 mole percent B.sub.2 O.sub.3, has a thermal expansion coefficient in a range of between about 160 and 210.times.10-7/.degree.C. and a dissolution rate in a range of between about 2.times.10.sup.- 7 and 2.times.10.sup.-9 g/cm.sup.2 -min. This composition is suitable to hermetically seal to metallic electrical components which will be subjected to humid environments over an extended period of time.

Research Organization:
AT & T CORP
DOE Contract Number:
AC04-76DP00789
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Number(s):
US 5262364
OSTI ID:
869016
Country of Publication:
United States
Language:
English

References (1)

A structural basis for the corrosion resistance of lead-iron-phosphate glasses: An X-ray absorption spectroscopy study journal September 1988

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Related Subjects

-9
-min
/501/
10
10-7
15
160
210
25
35
50
alloys
aluminum
aluminum alloy
aluminum alloys
bao
beryllium
cm
coefficient
components
composition
copper
degree
dissolution
electrical
electrical component
electrical components
environments
expansion
expansion coefficient
expansion materials
extended
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glass
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hermetically
hermetically seal
hermetically sealing
humid
materials
metallic
metallic electrical
mixtures
mole
mole percent
na
pbo
percent
percent na
period
range
rate
seal
sealing
sealing glass
stainless
stainless steel
stainless steels
steels
subjected
suitable
thermal
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time
times