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Is this not the wrong way round? "For the case that the CTE of the metal is larger than the CTE of the glass, the sealing shows a high probability to break upon cooling. By lowering the temperature, the metal wire shrinks more than the glass does, leading to a strong tensile force on the glass, which finally lead to breakage." Will this not produce tension in the wire, and compression of the glass? (There will also be a shear at the metal-glass interface, but in that case, its magnitude is dependent on the magnitude of the difference between the CTEs.)
ARaybould (talk) 16:04, 20 February 2020 (UTC)Reply
