对组份为（Ｎｄ０．１８Ｙ０．１８）Ｓｉ１０．３８Ａｌ１．６２Ｏ０．５４Ｎ１５．４６和（Ｎｄ０．１８Ｙｂ０．１８）Ｓｉ１０.３８Ａｌ１．６２Ｏ０．５４Ｎ１５．４６的复合稀土掺杂α－Ｓｉａｌｏｎ材料在１２００～１４００℃温度范围内的氧化行为进行了研究．样品由热压工艺制备．研究结果表明，在１２００和１３００℃氧化２０ｈ的材料表面存在择优取向的含Ｎｄ和Ｙ（或Ｙｂ）－硅酸盐晶粒．随氧化温度的提高，氧化表面由相对致密的硅酸盐氧化层软化形成气泡直至出现明显的透明玻璃相．文中还对氧化过程中表面形成的物相进行了讨论．
he oxidation behavior of multi-cation α-Sialons containing Nd and Y or Yb for the compositions (Nd0.18Y0.18)Si10.38Al1.62O0.54N15.46
and (Nd0.18Yb0.18)Si10.38Al1.62O0.54N15.46 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.
参考文献
| [1] | Hampshire S, Park H P, Thompson D P et al. Nature (London), 1978, 274: 880-882. 2 Huang Z K, Jiang Y Z, Tien T Y. J. Mater. Sci. Lett. 1997, 16: 747--751 3 Olsson P-O. J. Mater. Sci., 1989, 24: 3878--3887 4 Olsson P-O, Ekstrom T. J. Mater. Sci., 1990, 25: 1824--1832 5 Ekstrom T, Janssan K, Olsson P-O, et al. J. Eur. Ceram. Soc., 1991, 8: 3--9 6 Redington M, Hamphire S. Br. Ceram. Proc., 1992, 49: 175--190 7 Hwang C J, Susnitzky D W, Beaman D R. J. Am. Ceram. Soc., 1995, 78: 588--592 8 Kall P-O, Ekstom T. J. Eur. Ceram. Soc., 1990, 6: 119--127 9 Zhang J H, Wang P L, Yan D S. J. Mater. Chem., to be submitted. 10 Zhang J H, Wang P L, Yan D S. Eur. J. Solid State Inorg. Chem., 1997, 34: 1227--1236 |
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