Stability and electrical properties of MoSi2- and WSi2-oxide electroconductive composites
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TL;DR: MoSi2- and WSi2-based electroconductive ceramic composites were fabricated using 40-80 vol% fine and coarse-Al2O3, and ZrO2 particles (refractory oxides) after sintering in argon.
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Abstract: MoSi2- and WSi2-based electroconductive ceramic composites were fabricated using 40-80 vol% fine- and coarse-Al2O3, and ZrO2 particles (refractory oxides) after sintering in argon Their chemical and thermal stability was tested between 1400°-1600°C for up to 48 h X-ray diffraction analysis showed the formation of secondary 5-3 metal silicide (Mo5Si3, W5Si3) and silica phases on the grain boundaries and surface The fraction of the W5Si3 (114-388 vol%) was significantly higher than that of the Mo5Si3 (33-73 vol%) in the composites after annealing at 1400°C for 48 h The rates of grain growth in the composites (0013-0023 μm/h) were highly decreased by a grain boundary pinning effect This effect was relatively better with addition of the coarse-grained oxides due to their more homogeneous distribution throughout the microstructure The percolation threshold for the composites was generally above 20 vol% silicide addition except for the MoSi2-Al2O3 (fine-grained), which exhibited 88 and 81 S/cm electrical conductivity at 900° and 1000°C, respectively At 60 vol% silicide content, MoSi2-Al2O3 (coarse-grained) and WSi2-Al2O3 (fine-grained) showed higher electrical conductivity (126-128 S/cm) at 900°C The density, porosity level, particle distribution, intrinsic conductivity of silicide phase, particle size, and fraction of the secondary 5-3 silicide phase highly influenced their electrical properties
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Citations
Formation and oxidation behavior of Ce-modified MoSi2-NbSi2 coating on niobium alloy
L.R. Xiao,Xiaojun Zhou,Yifei Wang,Rong Pu,Gang Zhao,Ziqi Shen,Yali Huang,Sainan Liu,Zhenyang Cai,X.J. Zhao +9 more
TL;DR: MoSi2-NbSi2 coating and Ce-modified MoSi2Nb Si2 coating were prepared on Nb-alloy through a new two-step process, including molybdenum slurry spraying and halide-activated pack cementation.
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A novel ultra-high-temperature oxidation protective MoSi2-TaSi2 ceramic coating for tantalum substrate
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TL;DR: In this article, a MoSi2-TaSi2 ceramic coating was prepared on a pure tantalum (Ta) substrate using a novel three-step process, which included dip-coating with a molybdenum slurry, vacuum sintering, and halide-activated pack cementation (HAPC).
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