| Title | Microstructure, mechanical properties and chemical degradation of brazed AISI 316 stainless steel/alumina systems |
| Publication Type | Journal Article |
| 2008 |
| Authors | Paiva, OC, Barbosa, MA |
| Journal | Materials Science and Engineering AMater. Sci. Eng. A |
| Volume | 480 |
| Issue | 1-2 |
| Pagination | 306 - 315 |
| Date Published | 2008/// |
| 09215093 (ISSN) |
| Active metal brazing, Alumina, Bond strength (materials), Brazing, Electrochemical degradation, Filler metals, fracture, Interface composition, Metal/ceramic joining, Metallic matrix composites, morphology, Processing parameters, Shear strength, Stainless steel |
| The main aims of the present study are simultaneously to relate the brazing parameters with: (i) the correspondent interfacial microstructure, (ii) the resultant mechanical properties and (iii) the electrochemical degradation behaviour of AISI 316 stainless steel/alumina brazed joints. Filler metals on such as Ag-26.5Cu-3Ti and Ag-34.5Cu-1.5Ti were used to produce the joints. Three different brazing temperatures (850, 900 and 950 °C), keeping a constant holding time of 20 min, were tested. The objective was to understand the influence of the brazing temperature on the final microstructure and properties of the joints. The mechanical properties of the metal/ceramic (M/C) joints were assessed from bond strength tests carried out using a shear solicitation loading scheme. The fracture surfaces were studied both morphologically and structurally using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction analysis (XRD). The degradation behaviour of the M/C joints was assessed by means of electrochemical techniques. It was found that using a Ag-26.5Cu-3Ti brazing alloy and a brazing temperature of 850 °C, produces the best results in terms of bond strength, 234 ± 18 MPa. The mechanical properties obtained could be explained on the basis of the different compounds identified on the fracture surfaces by XRD. On the other hand, the use of the Ag-34.5Cu-1.5Ti brazing alloy and a brazing temperature of 850 °C produces the best results in terms of corrosion rates (lower corrosion current density), 0.76 ± 0.21 μA cm |
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