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Vacuum hot-pressing sintering (VHPS) was used for fabricating Nb-15W and Nb-15W-10Cr (at.%) alloys under 30 MPa for 60 min at 1800 °C in pure argon atmosphere. Microstructure and oxidation resistance of both materials were investigated. Microstructure analysis showed that the as-sintered Nb-15W alloy only consisted of α-Nb (W) solid solution and the as-sintered Nb-15W-10Cr alloy composed of α-Nb (W,...
To protect carbon/carbon (C/C) composites against oxidation, a multilayer MoSi 2 –SiC–B coating was prepared on the SiC-coated C/C composites by a simple and low-cost slurry method. The phase, microstructure and element distribution of the as-received coating were analyzed using X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. The as-received coating...
Micro-arc oxidation coatings were fabricated on 7E04 aluminum drillpipes materials in Na2SiO3-NaOH electrolyte system containing 3.0 g/L SiC particles at different current density (1, 5, 10, 15 and 20 A/dm2). The oxidation voltage, coating thickness, surface morphologies, surface micro-hardness, phase composition and potentiodynamic polarization curves of the MAO coatings were investigated. The results...
NiCoCrAlY coatings were prepared on GH3128 nickel-based superalloy substrates using radio-frequency magnetron sputter deposition. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy measurements showed different particle growth in the thin films after annealing the as-deposited coatings at various heat treatment conditions. In addition, X-ray diffraction data revealed that...
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