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Study on oxidation behavior of (Nd,Y)- and (Nd,Yb)-α-Sialon

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Abstract

The oxidation behavior of multi-cation α-Sialons containing Nd and Y or Yb has been investigated for the compositions (Nd0.18Y0.18)Si10.38Al1.62O0.54N15.46 and (Nd0.18Yb0.18)Si10.38Al1.62O0.54N15.46 respectively in the temperature range of 1200°C to 1400°C in air. The grains of silicate containing Nd and Y as well as Nd and Yb were observed in preferred orientation on the surface of the materials oxidized at 1200°C or 1300°C for 20 h for (Nd,Y)- and (Nd,Yb)-α-Sialon respectively. By increase of oxidation temperature from 1300°C to 1400°C, bubble, which was caused by softening of silicate oxidation layer, occurred and glassy phase then appeared obviously. The phases formed on the surfaces of multi-cation α-Sialons during the oxidation were also discussed in this paper.

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Authors and Affiliations

  1. The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Shanghai, 200050, People's Republic of China

    J. H. Zhang, P. L. Wang & D. S. Yan

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  1. J. H. Zhang
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  2. P. L. Wang
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  3. D. S. Yan
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Zhang, J.H., Wang, P.L. & Yan, D.S. Study on oxidation behavior of (Nd,Y)- and (Nd,Yb)-α-Sialon. Journal of Materials Science 37, 1407–1412 (2002). https://doi.org/10.1023/A:1014532915711

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