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Bonding of silicon nitride ceramic composites with Y2O3–La2O3–Al2O3–SiO2 mixtures

Published online by Cambridge University Press:  31 January 2011

Fei Zhou  and
Zheng Chen
Fei Zhou*
Affiliation:
School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu Province, People's Republic of China
Zheng Chen
Affiliation:
Department of Materials and Environment Engineering, East China Shipbuilding Institute, Zhenjiang 21200, Jiangsu Province, People's Republic of China
*
a)Address all correspondence to this author.
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Abstract

Silicon nitride ceramic composites were bonded using mixed Y2O3, La2O3, Al2O3, and SiO2 powers. The effect of bonding conditions on the joint strength was studied. The joint strength under different bonding conditions was measured by four-point bending tests. The interfacial microstructures were observed and analyzed by scanning electron microscopy, electron probe microanalysis (EPMA), and x-ray diffraction (XRD), respectively. The results of EPMA and XRD analyses showed that the liquid/glass solders reacted with silicon nitride at the interface, forming a Si3N4//Si2N2O/Y–La–Si–Al–O–N glass/Y–La–Si–Al–O glass gradient interface. From the results of the four-point bending tests, it is known that with an increase in bonding temperature and hold time, the joint strength first increased, reached a peak, and then decreased. LaYO3 precipitated from the joint glass can improve strength of the joint at both room and high temperatures.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 8 , August 2002 , pp. 1969 - 1972
Copyright
Copyright © Materials Research Society 2002

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