NDLI: Production, bonding strength and electrochemical behaviour of commercially pure Ti/Al$_{2}$O$

Content Provider	Springer Nature Link
Author	PAIVA, O. C BARBOSA, M. A
Copyright Year	1997
Abstract	The brazing of commercially pure titanium to Al$_{2}$O$_{3}$ has been studied. Two different brazing alloys within the Ag–Cu–Ti system and pure silver were selected as bonding agents. Titanium hydride (TiH2) additions were also tested, with the aim of improving the wetting of the ceramic surface by the melted brazing alloy. The mechanical and electrochemical behaviour of the produced joints was assessed, and related to chemical and morphological features resulting from an analysis by scanning electron microscopy and energy dispersive spectroscopy. It was possible to produce joints presenting high integrity, good strength and high resistance to corrosion. The best results were obtained when using an Ag–26Cu–3Ti brazing alloy. The addition of TiH$_{2}$ increased the mechanical properties, leading to a maximum bonding strength of 80±8 MPa, as determined in three-point bending tests. In most of the cases, for a maximum deflection of 5 mm, there was only a partial detachment of the ceramic/metal joints. The lowest values for the corrosion rates (i$_{corr}$=1.38 μA cm−2) determined in potentiodynamic experiments also correspond to the use of the Ag–26Cu–3Ti brazing alloy. The bonding strength and electrochemical results could be explained in terms of the different chemical compositions of the interfaces. The use of TiH$_{2}$ additions proved to be quite effective, allowing for the replacement of the usual metallizing and plating pre-treatments needed for the brazing of ceramics to metals.
Starting Page	653
Ending Page	659
Page Count	7
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	32
Issue Number	3
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	1997-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Materials Science Characterization and Evaluation Materials Mechanics Crystallography Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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