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| Abstract No.: |
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Scheduled at:
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Thursday, May 23, 2019, Saal Brüssel 1:00 PM
Brazing of Ni-/Fe-based materials
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| Title: |
Furnace brazing of inconel 718 with Ni and BNi-2 nanopastes
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| Authors: |
Anming Hu* / University of Tennessee Knoxville, USA
Denzel Bridges / University of Tennessee Knoxville, USA
Raymond Xu/ Rolls-Royce North America, USA
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| Abstract: |
Nanomaterials have a liquidus temperature at several hundred degrees below the bulk melting point due to the size-dependent melting point depression. This unique property makes nanomaterials a compelling candidate for developing innovative melting point depressant-free brazing materials. In our previous study, we demonstrated the possible brazing of Inconel 718 with silver and Cu nanoparticles at low temperatures. In this study nanopastes are produced from the synthesized Ni nanoparticles and BNi2 nanoparticles brazing material through high energy ball milling of conventional Nickel brazing alloy. Inconel 718 was vacuum brazed using isothermal and two-stage heating profiles. Nanobrazing was further compare to brazing with BNi-2 micrometer powders. The initial data showed that the shearing strength of 126 MPa has been achieved for Ni-nanoparticles and 189 MPa for BNi2 nanoparticles vs 68 MPa strength using BNi2 micro-scale powders when brazing at 900oC. The phase and microstructure evolution during brazing were studied through molecular dynamics simulation. The diffusions of individual elements are unveiled. The further optimizing of nanopaste is discussed based on mechanical properties, wetting, microstructure evolution and grain growth, and diffusion characterizations.
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