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Ni-25Cr alloys alloyed with Fe (5wt.% and 15wt.%) and Nb (0, 1 and 2wt.%) were designed and their oxidation behaviour was evaluated at 1000°C. Results reveal that alloyed Nb has a positive impact on oxidation in both the kinetics and oxide scale structures. The parabolic rate constant kp of Nb-alloyed Ni-25Cr-15Fe alloys are nearly one-fourth the value for Nb-free alloy. The oxide scales change from...
High-temperature application above 1600°C of C/SiC composites requires evaluation of the ablation properties. The C/SiC composites were prepared by low pressure chemical vapor infiltration using CH 3 SiCl 3 as precursor. As-prepared C/SiC composites were ablated by oxy-acetylene flame with the temperature of 2900 and 3550°C. Above 3550°C, subliming of carbon fiber and silicon carbide...
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