Home Metallic Materials - Kovové materiály 2014 Metallic Materials Vol. 52 (2014), no. 6, pp.321-327

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Metallic Materials Vol. 52 (2014), no. 6, pp.321-327

Title: Joining of Mo and MoSi2 and their interaction with nickel
Author: P. SEBO, P. ŠVEC Sr., M. ZEMÁNKOVÁ, P. ŠVEC Jr., P. D. JANIČKOVIČ, P. ŠTEFÁNIK

Abstract: Joining of Mo and MoSi2 with Mo and/or MoSi2 by brazing with nickel was studied. Molybdenum disilicide was prepared by the reaction of liquid silicon with the Mo substrate at the temperature of 1530 °C and 3 min. Wetting of both Mo substrate and MoSi2 was measured by sessile drop method; wetting angles were very low (close to zero). Products of interaction of Mo and/or MoSi2 with Ni were studied by electron microscopy with energy-dispersive spectroscopy (EDS) and X-ray diffraction methods (XRD). Shear strength of the joints was measured by push-off method. The Mo-Ni-Mo system produced a joint with no cracking or porosity with the shear strength 134.5 MPa. MoSi2-Ni-MoSi2 joint due to different thermal expansion of materials being joined exhibited porous interface and catastrophic cracking through Mo5Si3 with the shear strength 37.0 MPa.

Keywords: molybdenum disilicide, wetting, joining, shear strength
Year: 2014, Volume: 52, Issue: 6 Page From: 321, Page To: 327
doi:10.4149/km_2014_6_321


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