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- W1966095290 abstract "Abstract In this paper, two silicon nitride layers with thickness, 0.2 and 0.4 μm, are coated onto single crystal silicon (SCS) in order to achieve Si 3 N 4 /Si cantilever microbeams. The effect of LPCVD silicon nitride surface coatings on fatigue properties of SCS cantilever microbeams is investigated. Fatigue testing is conducted at both 40 Hz and 100 Hz. Typical S–N (strain amplitude–fatigue cycle) curves of the beams are achieved and correlated fatigue failure modes are investigated. It is found that thinner Si 3 N 4 coating of 0.2 μm results in better fatigue lives of Si 3 N 4 /Si beams than thicker Si 3 N 4 coating of 0.4 μm. Both thinner and thicker coated beams have major fatigue crack planes along {1 1 1} planes; however, thicker coated beams possess specific failure mode of delamination, which is not found in thinner coated beams. Delamination reduces the reinforcing effect of thicker Si 3 N 4 coating and leads to its shorter fatigue life. For thicker coated beams, fatigue life at 100 Hz is longer than that at 40 Hz. The mechanism for delamination and the effect of cyclic frequency is investigated, and factors for better fatigue life are proposed." @default.
- W1966095290 created "2016-06-24" @default.
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- W1966095290 date "2014-04-01" @default.
- W1966095290 modified "2023-09-26" @default.
- W1966095290 title "Effect of silicon nitride coating thickness on fatigue of silicon microbeams" @default.
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- W1966095290 doi "https://doi.org/10.1016/j.measurement.2013.12.003" @default.
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