Oxidation Behavior of Multi-Canon a-Sialons Containing Rare Earth

Abstract

Abstract: he oxidation behavior of multi-cation α-Sialons containing Nd and Y or Yb for the compositions (Nd_0.18Y_0.18)Si_10.38Al_1.62O_0.54N_15.46
and (Nd_0.18Yb_0.18)Si_10.38Al_1.62O_0.54N_15.46 was investigated in the temperature range of 1200℃ to 1400℃ in air.
The samples were prepared by hot-pressing technique. The results indicated that there existed silicate grains containing neodymium and yttrium or ytterbium in
preferred orientation on the surface of multi-cation (Nd,Y)- and (Nd,Yb)-α-Sialon respectively oxidized at 1200℃ or 1300℃ for 20h. By increase
of oxidation temperature, bubble, which was caused by softening of silicate oxidation layer, occurred and glassy phase appeared obviously on the surfaces of oxidized samples.
The phases formed on the surfaces of multi-cation α-Sialons during the oxidation were also discussed in this paper.

Key words: Sialon, Rare earth, Oxidation behavior

CLC Number:

TQ163

ZHANG Jun-Hong,WANG Pei-Ling,ZHANG Jiong,JIA Ying-Xin. Oxidation Behavior of Multi-Canon a-Sialons Containing Rare Earth[J]. Journal of Inorganic Materials.

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Oxidation Behavior of Multi-Canon a-Sialons Containing Rare Earth

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