|Joining of Mo and MoSi2 and their interaction with nickel|
SEBO, P., VEC Sr., P., ZEMÁNKOVÁ, M., VEC Jr., P., JANIČKOVIČ, D., TEFÁNIK, P.
vol. 52 (2014), no. 6, pp. 321 - 327
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.
molybdenum disilicide, wetting, joining, shear strength
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