Tearing during pinch-off of Rolamite fill tubes [report]

F.G. Yost
1981 unpublished
A failure mechanism is proposed to explain the bubble streaming and trichloroethylene infiltration which has been observed in failed Rolamite devices. An intergranular oxide network forms in the Kovar fill tube as a result of the glass-to-metal seal processing~ it is suggested that tearing occurs in this oxide network during a subsequent pinching-off operation. It is demonstrated that bending over a mandrel causes this intergranular network to widen and deepen in a tearing mode. A modified
more » ... idation heat treatment or partial oxidation procedure prevents this problem .
doi:10.2172/5712419 fatcat:rzafxxjc3rbl3lldei5rqlqbyy