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J. Korean Ceram. Soc. > Volume 58(1); 2021 > Article
Journal of the Korean Ceramic Society 2021;58(1): 77-85.
doi: https://doi.org/10.1007/s43207-020-00072-7
Characterization of porous sintered reaction-bonded silicon nitride containing three different rare-earth oxides
Ha-Neul Kim, Mi-Ju Kim, Young-Jo Park, Jae-Woong Ko
Engineering Ceramics Research Group, Korea Institute of Materials Science, 797 Changwondaero, Seonsangu, Changwon, Gyeongnam 51508, Republic of Korea
Correspondence  Ha-Neul Kim ,Email: skykim@kims.re.kr
Received: March 23, 2020; Revised: May 24, 2020   Accepted: August 10, 2020.  Published online: January 31, 2021.
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.
Key words: Reaction-bonded silicon nitride · Rare-earth oxide · Strength · Nitridation · LIBS
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