Laser Cladding Cermet Coatings on Niobium Substrate

Abstract:

Pure niobium substrates were coated using laser cladding method. Pure molybdenum, Yttria Stabilized Zirkonia (YSZ) and corundum (Al₂O₃) powders were used as coating materials. Coatings were deposited on specimens as seperate paths with 3÷10mm width and 40mm of length. Two different laser power 3kW and 4kW were tested during deposition. In order to assess the quality of the Mo-YSZ and Mo-Al₂O₃ coatings, the light microscopy, Scanning Electron Microscopy (SEM), chemical analysis (EDS) and Vickers hardness test investigation were performed. The surface roughness and wear volume were also measured. As a result of YSZ-Mo powder cladding on the Nb substrate the composite layers were obtained without cracks and porosity not exceeding 1 μm. In addition, an increase in hardness of about 450 HV0.5 was revealed. As a result of Al₂O₃-Mo powder cladding on the Nb substrate the composite layers with many voids and cracks were obtained for each of the cladding variants.

• Periodical: Solid State Phenomena (Volume 326)
• Pages: 167-184
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.326.167
• Online since: November 2021
• Authors: Radosław Szklarek*, Wojciech Pakieła, Tomasz Tański, Kamil Sobczak
• Keywords: Cermet, Coatings, Corundum, Laser Cladding, Molybdenum, Niobium, YSZ, Zirkonia

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