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- W2054339908 abstract "The effect is reported of seven inorganic oxide additives on both the formation mechanism and the densification of X-sialon prepared by a silicothermal process. The oxides were added to the starting mixture of halloysite clay, alumina and elemental silicon at a level of 1 wt% of the calculated final product, and fired in nitrogen at 1200–1500°C. The formation of X-sialon was monitored by thermal analysis, powder XRD and 27Al and 29Si solid state MAS NMR. The effects of the additives are temperature dependent, and influence the various stages of the reaction by differing degrees. The oxides which best promote the formation of crystalline X-sialon (Y2O3, CaO and MgO) are also those which facilitate the conversion of initially-formed Si3N4 to SiO2N2 and SiO3N units, the latter being particularly enhanced by Y2O3, Fe2O3 enhances the initial nitridation of Si but suppresses X-sialon formation by stabilising the preceding mullite phase. Densification is most enhanced by Y2O3, CaO and CeO2; MgO exerts its maximum effect on sintering at lower temperatures. The beneficial influence of MgO and Y2O3 on both X-sialon formation and sintering is due to the formation of liquid phases." @default.
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- W2054339908 date "1999-05-01" @default.
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- W2054339908 title "Silicothermal synthesis and densification of x-sialon in the presence of metal oxide additives" @default.
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- W2054339908 doi "https://doi.org/10.1016/s0955-2219(98)00229-5" @default.
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