| 摘要 |
A ceramic portion is inserted in the front side of the housing envelope by shrinking. At the the junction of these parts, a sealing layer, preferably a galvanized copper layer, is applied plied which ensures a connection which under the resulting pressure is impermeable to gases and humidity. The ceramic portion is exposed to a strong radial pressure prestress with the result that the tensile stress of the ceramic portion is reduced and thus the pressure resistance thereof is increased under the effect of an axially acting external pressure.
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