Abstract
Although sintering of pure Si3N4 has been found difficult, considerable progress has been made with liquid state sintering. The following sintering aids have been used with particular success, either singly or in combination: MgO, Y2O3, Al2O3 and BeSiN2. The main problem with sintering above 1500°C is decomposition of Si3N4 and weight loss by evaporation of Si or SiO. The weight loss can be suppressed by sintering in a high pressure N2-atmosphere and/or using a powder bed. Devitrification of the glassy phase improves the high temperature properties. Whilst very fine powders often result in high shrinkages, “post-sintering” of RBSN leads to very low shrinkage. In this process the sintering aid may be admixed with the Si-powder before nitridation or the RBSN body can be infiltrated cold in a soluble form or hot from the powder bed. One can now foresee the mass production of engineering components with good high temperature properties.
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© 1983 Martinus Nijhoff Publishers, Boston/The Hague/Dordrecht/Lancaster
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Popper, P. (1983). Sintering of Silicon Nitride, a Review. 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_15
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DOI: https://doi.org/10.1007/978-94-009-6851-6_15
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