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- W3204142132 abstract "A series of W- x Si bulk composites was prepared by SPS at the same condition. It was found that the phase compositions and their distribution state have great influence on the sample's oxidation resistance performance. For the low Si content composite, the nano-SiO 2 particles generated from dissolved Si densely packed on the tungsten oxide grain boundary, which can effectively prevent the growth of WO 3 grains and cracks expanding in the oxide layer below 1000 °C. However, as the temperature increases to 1000 °C and the oxidation time is prolonged, more nanoparticles will precipitate out from matrix and grow to form a cross-linked network structure. This growth will lead nano-SiO 2 particles to unevenly distribute on the surface of WO 3 grains, which causes WO 3 grains to expose in the air and volatilize. On the other hand, for the high Si content composite, a continuous double oxide layer originating from W 5 Si 3 is formed on the surface of the sample, the outer layer is a nano-porous SiO y layer, and the inner layer is a dense composite oxide layer composed of polycrystalline WO 3 nanoparticles and amorphous SiO y . This double oxide layer is much more stable than the nano-SiO 2 particles and allows the sample to resist oxidation for longer time at 1000 °C. Thus, a continuous distribution state of oxidized W 5 Si 3 is the key factor for getting crack-free oxide scale. • The influence of phase compositions on the oxidation resistance performance of W- x Si bulk composite is clarified. • Nano-SiO 2 particles formed from dissolved Si can restrain tungsten oxide grains growth in a certain extent. • The improvement of oxidation resistance is mainly attributed to the continuous double oxide layer formed from W 5 Si 3 ." @default.
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- W3204142132 date "2021-11-01" @default.
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- W3204142132 title "A self-passivating tungsten bulk composite: Effects of silicon on its oxidation resistance" @default.
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- W3204142132 doi "https://doi.org/10.1016/j.ijrmhm.2021.105631" @default.
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