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Characterization of porous sintered reaction-bonded silicon nitride containing three different rare-earth oxides

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Abstract

The effect of rare-earth oxides on the characteristics of porous sintered reaction-bonded silicon nitride (SRBSN) was investigated. Three types of raw Si powder mixtures containing different rare-earth oxide (La2O3, Er2O3, and Yb2O3) were prepared and nitrided in the form of compacts. The nitriding profiles of the respective raw powder mixtures with elevating temperature indicated that Yb2O3 clearly promoted the nitridation of Si compacts at low temperature compared with other rare-earth oxides, and the β-Si3N4 ratio after completion of the nitriding reaction was different at which temperature the major nitridation occurred. Yb2O3 was found to be the most effective additive to achieve a strong porous SRBSN, having the flexural strength of 441 MPa. The reason why Yb2O3 promotes the nitridation reaction and has excellent mechanical properties after post-sintering is that oxygen was removed during the nitriding reaction, which was supported by the analysis of oxygen content via the laser-induced breakdown spectroscopy.

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Acknowledgements

This work was financially supported by Fundamental Research Program of Korea Institute of Materials Science (Grant no. PNK6830).

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  1. Engineering Ceramics Research Group, Korea Institute of Materials Science, 797 Changwondaero, Seonsangu, Changwon, Gyeongnam, 51508, Republic of Korea

    Ha-Neul Kim, Mi-Ju Kim, Young-Jo Park & Jae-Woong Ko

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Correspondence to Ha-Neul Kim.

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Kim, HN., Kim, MJ., Park, YJ. et al. Characterization of porous sintered reaction-bonded silicon nitride containing three different rare-earth oxides. J. Korean Ceram. Soc. 58, 77–85 (2021). https://doi.org/10.1007/s43207-020-00072-7

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  • DOI: https://doi.org/10.1007/s43207-020-00072-7

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