Characterization of Al2O3/Al/Al2O3 Joints with Ti+Cr Interlayer
International Journal of Materials Science and Applications
Volume 3, Issue 5, September 2014, Pages: 152-158
Received: Aug. 20, 2014; Accepted: Aug. 28, 2014; Published: Sep. 10, 2014
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Authors
Marzanna, Maria Ksiazek, Foundry Research Institute, Complex of research Laboratories, Cracow, Poland
Maria, Wieslawa Richert, AGH University of Science and Technology, Faculty of Non-Ferrous Metals, Cracow, Poland
Lukasz, Rafal Boron, Foundry Research Institute, Complex of research Laboratories, Cracow, Poland
Adam Tchorz, Foundry Research Institute, Complex of research Laboratories, Cracow, Poland
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Abstract
Joints of Al2O3/Al/Al2O3 are formed by liquid – state bonding of alumina substrates covered with thin Ti+Cr film of 380 nm thickness using an Al interlayer of 30 µm at 973 K under a vacuum of 0.2 mPa applied for 5 minutes and at a pressure of 0.01 MPa. The bond strength of the joints is examined by a four – point bend testing at room temperature, coupled with optical, scanning and transmission electron microscopy. Results show that introduction of the thin Ti+Cr film layer: (i) improves plasticity in the metal layer of Al2O3/Al/Al2O3 joints, (ii) has positive effect on structure transformation in the interface and leads to fabrication of reliable metal-ceramic joints. Information obtained from the wetting characteristics of liquid Al on alumina substrate coated by thin Ti+Cr film indicates that the contact angle can be reduced to even less than 60°. Microstructural investigations of the interface of Al2O3/Ti+Cr/Al/Ti+Cr/Al2O3 joints carried out by SEM and TEM techniques indicated that the precipitates of intermetallic phases rich in both Ti and Cr as well as Al2O3 were formed at the Al/Al2O3 interface, which influenced strengthening of these joints. Hence a conclusion can be drawn that the interface structure influences the mechanical durability increase in Al/Al2O3 joints.
Keywords
Metal–Ceramic Joining, Liquid State Bonding, Bond Strength, Fracture Interface
To cite this article
Marzanna, Maria Ksiazek, Maria, Wieslawa Richert, Lukasz, Rafal Boron, Adam Tchorz, Characterization of Al2O3/Al/Al2O3 Joints with Ti+Cr Interlayer, International Journal of Materials Science and Applications. Vol. 3, No. 5, 2014, pp. 152-158. doi: 10.11648/j.ijmsa.20140305.14
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