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- W2006054057 abstract "A microwave-sintered Si3N4–Y2O3–MgO system containing ZrO2 particulates was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Although the starting powder was α-Si3N4 with Y2O3, MgO, and ZrO2 dopants, the sintered crystalline phases, analyzed by XRD, are mainly β-Si3N4 with minor N-Melilites (Y2Si3O3N4). TEM micrographs show that the N-Melilites are distributed at the multigrain junctions, suggesting they are formed by crystallization from a liquid phase. SEM analysis shows that Si3N4 grains are interlocked with each other. A large amount of secondary phase (13 vol%), containing Si–Y–Mg–O–N elements as identified by energy-dispersive X-ray spectrometer is present in the multigrain junctions and grain boundaries. TEM analysis found that small ZrO2 grains (d<200 nm) are frequently embedded in Si3N4 grains, while others remain as dispersoids and grains dispersed in the matrix. The addition of ZrO2 as a susceptor for microwave sintering increases the heating rate. However, there appeared to be very minor dissolution of ZrO2 in the oxynitride liquid during sintering. Both tetragonal and cubic Zr-rich phases were identified by selected-area electron diffraction, which supports the existence of N-stabilizing ZrO2. Microwave sintering favored the formation of the Si–Mg–Y oxynitride liquid phase and thus enhanced the dissolution of α-Si3N4." @default.
- W2006054057 created "2016-06-24" @default.
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- W2006054057 date "2006-12-01" @default.
- W2006054057 modified "2023-10-05" @default.
- W2006054057 title "Microstructures of Microwave-Sintered Silicon Nitride with Zirconia as Secondary Particulates" @default.
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- W2006054057 doi "https://doi.org/10.1111/j.1551-2916.2006.01304.x" @default.
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