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- W4303199471 abstract "The present study reports for the first time the synthesis and evaluation of magnesium (Mg)-doped nitrogen-rich (N-rich) sialon ceramics exploring the possible existence of Mg-stabilized single-phase alpha-sialon (on the Mg-alpha-sialon plane). Mg-stabilized N-rich sialons, with the general formula of MgxSi12−2xAl2xN16 having x value in the range of 0.2–2.2 for the composition laying along the Si3N4–0.5Mg3N2:3AlN line, were synthesized at 1500°C, using nano-size starting powder precursors and field-assisted (or spark plasma) sintering technique. Consolidated sialon ceramic samples were characterized for their microstructure, phase stability regime, and physical and mechanical properties. Although a relatively low synthesis temperature was adopted, well densified sialon samples were achieved; however, the densification of the samples became difficult with a higher x value (containing high Mg3N2/AlN content). Contrary to what was expected to take place, a single-phase Mg-doped sialon was not obtained near the N-rich line (on Mg-alpha-sialon plane). Such distinctive behavior in Mg-doped sialons was supposed to be due to the formation of a highly stable Mg-containing aluminum nitride polytype phase, which consumed most of the high-temperature transient liquid phase. Mg-doped N-rich sialon sample having the maximum amount of alpha phase depicted a remarkable hardness (HV10) of 21.4 GPa and a fracture toughness of 3.5 MPa m1/2." @default.
- W4303199471 created "2022-10-07" @default.
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- W4303199471 date "2022-10-17" @default.
- W4303199471 modified "2023-10-02" @default.
- W4303199471 title "Synthesis of Mg‐stabilized nitrogen‐rich alpha‐sialons along Si <sub>3</sub> N <sub>4</sub> –0.5Mg <sub>3</sub> N <sub>2</sub> :3AlN line via field‐assisted sintering" @default.
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- W4303199471 doi "https://doi.org/10.1111/jace.18838" @default.
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