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Fabrication of a Glass-Ceramic-to-Metal Seal between Ti-6Al-4V and a Strontium Boroaluminate Glass

Whiting, MJ, Staff, MT, Fernie, JA, Mallinson, PM and Yeomans, JA (2016) Fabrication of a Glass-Ceramic-to-Metal Seal between Ti-6Al-4V and a Strontium Boroaluminate Glass International Journal of Applied Ceramic Technology: ceramic product development and commercialization, 13 (5). pp. 956-965.

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Glass-ceramics are widely utilized in the electronics industry to provide electrical insulation and to form leak tight joints with a range of metals. The coefficient of thermal expansion (CTE) of the glass-ceramic can be controlled by the extent of crystallization to reduce detrimental tensile stresses in the joint. In recent years there has been interest in using titanium alloys, in place of stainless steels, due to their lower density and superior specific strength. In this study, the heat treatment of a strontium boroaluminate glass has been tailored to create glass-ceramics with mean CTEs ranging from 5.7 ± 0.1 × 10-6 K-1 to 9.7 ± 0.1 × 10-6 K-1 over the temperature range 303 K to 693 K. The resultant glass-ceramic consists of three crystalline phases and residual glass. A glass-ceramic with a mean CTE of 6.9 ± 0.1 × 10-6 K-1 was subsequently fabricated to form a compression seal with a Ti-6Al-4V housing and a pre-oxidized Kovar pin. Single pin assemblies were shown to be reproducible in terms of microstructure and all passed a standard helium leak test, indicating that a successful seal had been produced.

Item Type: Article
Subjects : Mechanical Engineering
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Date : 1 May 2016
Funders : The Engineering and Physical Sciences Research Council
Identification Number :
Grant Title : Centre for Doctoral Training in Micro- and NanoMaterials and Technologies
Copyright Disclaimer : This article is published open access under a Creative Commons License, with the permission of the Controller of HMSO and the Queen's Printer for Scotland.
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 24 Mar 2016 13:00
Last Modified : 14 Mar 2017 12:28

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