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| 1 | Hot-corrosion behavior of Cr_2O_3–CNT-coated ASTM-SA213-T22 steel in a molten salt environment at 700°C显示文摘The present work investigates the hot-corrosion behavior of carbon nanotube(CNT)-reinforced chromium oxide coatings on boiler steel in a molten salt(Na_2SO_4–60 wt%V_2O_5) environment at 700°C under cyclic conditions. The coatings were deposited via the high-velocity oxygen fuel process. The uncoated and coated steel samples were subjected to hot corrosion in a silicon tube furnace at 700°C for 50 cycles. The kinetics of the corrosion behavior was analyzed through mass-gain measurements after each cycle. The corrosion products were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray analysis techniques. The results revealed that uncoated steel suffered spallation of scale because of the formation of nonprotective Fe_2O_3 scale. The coated steel samples exhibited lower mass gains with better adhesiveness of oxide scale with the steel alloy until the end of exposure. The CNT-reinforced coatings were concluded to provide better corrosion resistance in the hot-corrosion environment because of the uniform dispersion of CNTs in the coating matrix and the formation of protective chromium oxides in the scale. | Khushdeep Goyal Hazoor Singh Rakesh Bhatia | 2019 | International Journal of Minerals,Metallurgy and Materials2019，26，3： | 3 |
| 2 | Microstructure and mechanical properties of Nb–Mo–ZrB_2 composites prepared by hot-pressing sintering显示文摘Nb–Mo–ZrB_2 composites(V(Nb)/V(Mo) = 1) with 15 vol% or 30 vol% of ZrB_2 were fabricated by hot-pressing sintering at 2000°C. The phases, microstructure, and mechanical properties were then investigated. The composites contain Nb-Mo solid solution(denoted as(Nb, Mo)ss hereafter), Zr B, Mo B, and Nb B phases. Compressive strength test results suggest that the strength of Nb–Mo–ZrB_2 composites increases with increasing ZrB_2 content; Nb–Mo–30 vol%ZrB_2 had the highest compressive strength(1905.1 MPa). The improvement in the compressive strength of the Nb–Mo–ZrB_2 composites is mainly attributed to the secondary phase strengthening of the stiffer Zr B phase, solid-solution strengthening of the(Nb, Mo)ss matrix as well as fine-grain strengthening. The fracture toughness decreases with increasing ZrB_2 content. Finally, the fracture modes of the Nb–Mo–ZrB_2 composites are also discussed in detail. | yuan gao zong-de liu qi wang yong-tian wang | 2018 | International Journal of Minerals,Metallurgy and Materials2018，25，7： | 1 |
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