Abstract
By using single additions of Li2O, CaO, MgO, MgO-SiO2 (talc), SiO2, B2O3, NiO, Cr2O3 and Y2O3 in the amount of 1 wt% to partially oxidized AIN-submicron powder (4–6 wt% 0) almost complete densification could be achieved through sintering under nitrogen at comparatively low firing temperatures.
Flexural strength values of 300–500 MN/m2 could be measured. Optical microscopy, EPMA and X-ray diffraction studies revealed a two-phase structure in the dense compounds, the second phase being an aluminium-oxynitride. It is shown that either equiaxed cubic γ-AloN (spinel) grains or plate-like rhombohedral 27R-A1N polytype grains (Al9O3N7 or Si6−xAl12+xOxN20−x) of high aspect ratio are formed, dependent on the additive used. The different microstructures did not seem to have a marked effect on the room temperature strength of the oxynitride-bonded A1N ceramics studied.
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© 1983 Martinus Nijhoff Publishers, Boston/The Hague/Dordrecht/Lancaster
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Schwetz, K.A., Knoch, H., Lipp, A. (1983). Sintering of Aluminium Nitride with Low Oxide Addition. In: Riley, F.L. (eds) Progress in Nitrogen Ceramics. NATO ASI Series, vol 65. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6851-6_21
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DOI: https://doi.org/10.1007/978-94-009-6851-6_21
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