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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

复合添加(Ca,Mg)-α-Sialon的晶胞参数研究

王佩玲; 贾迎新; 张骋; 孙维莹   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室, 上海 200050
  • 收稿日期:1998-11-12 修回日期:1998-12-11 出版日期:2000-02-20 网络出版日期:2000-02-20

Study on Lattice Parameters of (Ca,Mg)- α-Sialon

WANG Pei-Ling; JIA Ying--Xin; ZHANG Cheng; SUN Wei-Ying   

  1. The State Key Lab of High Performance Ceramics and Superfine Microstructrue; Shanghai Institute ofCeramics; Shanghai 200050; China
  • Received:1998-11-12 Revised:1998-12-11 Published:2000-02-20 Online:2000-02-20

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1094

被引次数

3

摘要： 利用高分辨率的Ｇｕｉｎｉｅｒ－Ｈａｇｇ相机和计算机控制的底片扫描及数据处理程序系统，测定了复合添加，组份为（Ｃａ０．５Ｍｇ０．５）xＳｉ１２－３ｘAl3xＯｘＮ１６－ｘ（ｘ＝０．３、０．６、１．０和１．４）的α－Ｓｏａｌｏｎ的晶胞参数．材料由热压工艺制备而得．研究结果表明，当ｘ≥１．０时，材料的主晶相为α－Ｓｉａｌｏｎ和含Ｍｇ的ＡlＮ多型体．（Ｃａ，Ｍｇ）－α－Ｓｉａｌｏｎ的晶胞参数明显低于相同组份下的Ｃａ－α－Ｓｉａｌｏｎ的晶胞参数·ＥＤＡＸ的结果进一步给出固溶进入α－Ｓｉａｌｏｎ的包括名义组份中９０％的Ｃａ＋＋和少量的Ｍｇ＋＋，而大部分Ｍｇ＋＋进入ＡlＮ多型体，这一结果为净化α－Ｓｉａｌｏｎ陶瓷的晶界提供了新的有效途径．

关键词: Ca, Mg, Sialon, AlN多型体, 晶胞参数

Abstract: By using Guinier-Hagg camera, computer-linked scanner system and associated programs, the lattice parameters of α-Sialon for the
compositions (Ca0.5Mg0.5)xSi3-xAlxOxN16-x with x ranging from 0.3 to 1.4 were determined. The samples were prepared by hot pressing technique. The
results showed that the crystalline phases in the sintered materials consist of α-Sialon and Mg-containing AlN-polytypoid when x is equal to or
greater than 1.0 and the lattice parameters of (Ca,Mg)-α-Sialon are obviously smaller than Ca-α-Sialon with the same compositions. EDAX
results further revealed that 90% of added Ca++ and small amount of Mg++ are incorporated into α-Sialon. This result combined with
the fact of formation of magnesium-containing AlN-polytypoid phase in (Ca,Mg)-α-Sialon samples can provide a valid approach to reduce the
amount of glassy phase at the grain boundary.

Key words: Ca, Mg, Sialon, AlN-polytypoid, lattice parameters

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