Abstract
In the present investigation Zr02 toughened Al203 (ZTA) has been brazed to AISI 316 stainless steel using Ag-4Ti (CB2) and Ag–26.5Cu–3Ti (CB4) filler metals along with nickel and copper inter layers respectively. It is shown that the best properties are achieved with the CB2 filler material and nickel interlayer. Under optimum brazing conditions, this combination provides an average four point bending strength of 0303; 150 MPa, which is only 20% lower than that observed for plain ZTA-ZTA joints. In contrast, the high yield strength and strain hardening coefficient of the CB4 filler metal makes it less suitable for brazing of ZTA–steel joints, where bending strengths below 25 MPa are attained because of a high residual stress level. These results are not significantly improved by the use of a ductile copper interlayer, since copper partly dissolves in the filler metal during the brazing operation.
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