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Behavior of Interlayers of Glass‐to‐Tungsten Seals
Author(s) -
TAKAMORI TAKESHI,
TOMOZAWA MINORU
Publication year - 1965
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1965.tb14777.x
Subject(s) - tungsten , alkali metal , materials science , potassium , seal (emblem) , metallurgy , thermal stability , composite material , mineralogy , chemical engineering , chemistry , art , organic chemistry , visual arts , engineering
The relation of the stability of glass‐to‐tungsten seals to glass composition was studied. Colors of interlayers in the seals depended on alkali content of the glasses. The interlayers were identified, by X‐ray diffraction, as WO 2 , W 18 O 49 , and alkaline tungsten bronzes. Differences in the thermal expansion of these substances were considered with respect to the seal strength. Sodium‐ and potassium‐free glasses did not form tungsten bronzes at the interface, and seals between such a glass and tungsten were more durable than seals between an ordinary alkali‐containing glass and tungsten. An accelerated procedure for detecting potential leaks in seals was tested. Effects of heat treatment on colors of sealed specimens were also observed.