Bond strength of vacuum brazed Mg-PSZ/steel joints |
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| Affiliation: | 1. Department of Geological Sciences, Stanford University, Stanford, CA 94305, United States;2. E.L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, United States |
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| Abstract: | Mg-PSZ/steel joints vacuum brazed by the aid of amorphous Cu-30 w/o Ti foils were prepared in the temperature range 883 to 990 °C. A maximum bond strength of 176 MPa (flexural strength, four-point bend test) was obtained after brazing at 930 °C/5 min. Fracture energy and fracture resistance data of the interface region and the adjacent dark-coloured, oxygendeficient zone of Mg-PSZ were obtained from experiments using notched specimens. A drastic decrease of fracture energy of Mg-PSZ from 178 J/m2 for the as-received material to 60.2 J/m2 for the blackened zirconia adjacent to the braze was observed. This effect is assumed to influence the bond strength of the brazed joints. |
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