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Mechanical Properties and the Microstructure of AlO/Al/AlO Joints with the Surface Modification of Alumina by a Thin Layer of Ti + Nb.

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Bibliographic Details
Title: Mechanical Properties and the Microstructure of AlO/Al/AlO Joints with the Surface Modification of Alumina by a Thin Layer of Ti + Nb.
Authors: Ksiazek, Marzanna1 marzanna.ksiazek@iod.krakow.pl, Tchorz, Adam1, Boron, Lukasz1
Source: Journal of Materials Engineering & Performance. May2014, Vol. 23 Issue 5, p1635-1640. 6p.
Subjects: Aluminum oxide, Joints (Engineering), Mechanical properties of metals, Metal microstructure, Metal bonding, Bond strengths
Abstract: AlO/Al/AlO joints were formed by liquid-state bonding of alumina substrates covered with a thin Ti + Nb coating of 900 nm thickness with the use of an Al interlayer of 30 μm at 973 K under a vacuum of 0.2 mPa for 5 min. The bond strength of the joints was examined by a four-point bending test at 295, 373, and 473 K. Optical, scanning, and transmission electron microscopies were applied for detailed characterization of the interface structure and failure characteristics of fractured joint surfaces. The analysis of the results has shown that (i) bonding occurred due to the formation of a reactive interface on the metal side of the joint in the presence of AlNb(Ti) precipitates and (ii) modification of AlO by a thin layer of Ti + Nb increases the hardness at the interface and makes it possible to achieve reliable joints working at elevated temperatures. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:AlO/Al/AlO joints were formed by liquid-state bonding of alumina substrates covered with a thin Ti + Nb coating of 900 nm thickness with the use of an Al interlayer of 30 μm at 973 K under a vacuum of 0.2 mPa for 5 min. The bond strength of the joints was examined by a four-point bending test at 295, 373, and 473 K. Optical, scanning, and transmission electron microscopies were applied for detailed characterization of the interface structure and failure characteristics of fractured joint surfaces. The analysis of the results has shown that (i) bonding occurred due to the formation of a reactive interface on the metal side of the joint in the presence of AlNb(Ti) precipitates and (ii) modification of AlO by a thin layer of Ti + Nb increases the hardness at the interface and makes it possible to achieve reliable joints working at elevated temperatures. [ABSTRACT FROM AUTHOR]
ISSN:10599495
DOI:10.1007/s11665-014-0980-1