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Joining of Alumina Ceramics Using Nanocrystalline Tape Cast Interlayer

Published online by Cambridge University Press:  31 January 2011

R. Chaim  and
B. G. Ravi
R. Chaim
Affiliation:
Department of Materials Engineering, Technion—Israel Institute of Technology, Haifa 32000, Israel
B. G. Ravi
Affiliation:
Department of Materials Engineering, Technion—Israel Institute of Technology, Haifa 32000, Israel
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Abstract

Nanocrystalline transition alumina tape casts were used as interlayers to join conventional alumina ceramic pellets. The joining experiments were performed by hot pressing at 1200–1300 °C under uniaxial pressures of 55 and 80 MPa for 1- and 5-h durations, with and without a nanocrystalline interlayer. Successful joints were enabled only above 1250 °C in the presence of the interlayer. Generally, the joint 4-point bending strength increased with the increase in joining temperature, pressure, and duration. The average bending strength of the interface joined at 1250 °C was 245 ± 65 MPa compared to the pellet strength of 268 MPa. Postjoining heat treatments at 1400 °C for 3 h caused reduction in the joint strength. The interlayer at the joint exhibited homogeneous and crack-free microstructure. The changes in the joint strength were discussed with respect to the densification and grain growth behavior of the nanocrystalline interlayer.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 8 , August 2000 , pp. 1724 - 1728
Copyright
Copyright © Materials Research Society 2000

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