The Influence Of Metal Diffusion And Interfacial Reactions On The Crystalisation Behaviour Of Glasses Employed In The Manufacture Of Glass-Ceramics-To-Metal Seals.

One of the major attributes of the glass-ceramics is an ability to tailer thier thermal expansion characteristics and this makes them ideal cadidates for sealing to a wide variety of metals and alloys; however, during the sealing process, reaction of diffusing metals species with glass constituents may occur, and this can lead to the formation of undesirable faces within the interfacial region. In addition, the diffusion of metla species into the bulk glass away from the interface may affect the overall crystalisation kinetics and can result in the formation of unwanted crystalline phases which may be detrimentla to the lifetime behaviour of a a seal component.