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- W1994313443 abstract "Abstract An attempt was made to prepare various F-doped β-, O-, X-, and α-SiAlONs from a mixture of Si 3 N 4 , SiO 2 , Al 2 O 3 , AlN, or Y 2 O 3 using AlF 3 or topaz as the fluorine source by HIPing at 1500–1800°C and 150 MPa. The phases were identified and the z , x , and m/n values determined for β-, O-, and α-SiAlONs by X-ray diffraction. When AlF 3 was used, a single phase ceramic (O-SiAlON) was produced from a mixture of α-Si 3 N 4 and SiO 2 at 1500°C, with a mixture of O- and β-SiAlONs formed at 1700°C. A mixture of α-Si 3 N 4 , AlN, and Y 2 O 3 with AlF 3 produced β-/Y-α-SiAlON ceramics at 1730°C. The use of topaz produced the β-SiAlON ceramic with a trace of mullite from a mixture of α-Si 3 N 4 and AlN at 1770°C and mixed phase β-/O-SiAlON ceramics from α-Si 3 N 4 and SiO 2 at 1700°C. Single phase X-SiAlON could not be obtained under the present conditions. The microstructures of the single phase O- and β-SiAlON ceramics and the β-/Y-α-SiAlON mixture showed the growth of O- and β-SiAlON and Y-α-SiAlON crystals with hexagonal and/or long rod-like or platy shapes in a matrix of F-containing glassy phase. The compositions of the SiAlON crystals and the glass phase were semi-quantitatively determined by EDX; the total glass phase was estimated by a quantitative Rietveld XRD powder method. The F-doped β-SiAlON ceramics showed better corrosion resistance towards NaCl vapor and lower Vickers hardnesses." @default.
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- W1994313443 date "2001-12-01" @default.
- W1994313443 modified "2023-09-29" @default.
- W1994313443 title "Microstructure and properties of various fluorine-containing SiAlON ceramics synthesized by HIPing" @default.
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