Phase Equilibria in the System Si3N4-SiO2-BeO-Be3N2 |
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Authors: | IRVIN C HUSEBY† HANS L LUKAS GÜNTER PETZOW |
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Affiliation: | Max-Planck-Institut fuer Metallforschung, Institut fuer Werkstoffwissenschaften, Stuttgart, West Germany |
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Abstract: | The 1780°C isothermal section of the reciprocal quasiternary system Si3N4-SiO2-BeO-Be3N2 was investigated by the X-ray analysis of hot-pressed samples. The equilibrium relations shown involve previously known compounds and 8 newly found compounds: Be6Si3N8, Be11Si5N14, Be5Si2N6, Be9Si3N10, Be8SiO4N4, Be6O3N2, Be8O5N2, and Be9O6N2. Large solid solubility occurs in β-Si3N4, BeSiN2, Be9Si3N10, Be4SiN4, and β-Be3N2. Solid solubility in β-Si3N4 extends toward Be2SiO4 and decreases with increasing temperature from 19 mol% at 1770°C to 11.5 mol% Be2SiO4 at 1880°C. A 4-phase isotherm, liquid +β-Si3N4 ( ss )Si2ON2+ BeO, exists at 1770°C. |
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