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Microstructural evolution during reactive brazing of alumina to Inconel 600 using Ag-based alloy

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Title Microstructural evolution during reactive brazing of alumina to Inconel 600 using Ag-based alloy
 
Creator LAIK, A
MISHRA, P
BHANUMURTHY, K
KALE, GB
KASHYAP, BP
 
Subject Brazing
Microstructure
Phase stability
Alumina
Inconel
TO-METAL JOINTS
CU-O SYSTEM
THERMODYNAMIC EVALUATION
INTERFACIAL REACTIONS
RESIDUAL-STRESSES
PHASE-STABILITY
CUAGTI ALLOYS
FILLER METAL
COPPER
INTERLAYERS
 
Description A metal ceramic bonding process was developed to produce vacuum tight alumina Inconel 600 joints using an Ag-based active metal brazing alloy that can withstand continuous operating temperature up to 560 degrees C. The microstructure and microchemistry of the braze zone was examined using extensive microanalysis of the constituent phases and a mechanism for the interfacial reactions responsible for the bonding is proposed. Prolonged heat treatment at 400 and 560 degrees C under simulated in-service conditions revealed that the microstructure of braze zone of the joints was stable and maintained leak-tightness and strength. The bond strength of the interface was high enough to cause failure in the alumina side of the joints. Failure of the joints was caused by initiation of crack on the surface of alumina as a result of high tensile residual stress adjacent to the metal ceramic interface. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-10-16T05:21:04Z
2014-10-16T05:21:04Z
2013
 
Type Article
 
Identifier ACTA MATERIALIA, 61(1)126-138
http://dx.doi.org/10.1016/j.actamat.2012.09.040
http://dspace.library.iitb.ac.in/jspui/handle/100/15322
 
Language en