低温耦合固相氮化反应合成β-Sialon  

Synthesis of β-Sialon by Low-temperature Solid-phase Nitride Coupled Reaction

作　　者：彭晓文[1] 郭玉香[1] 罗旭东[1] 刘新[1] 曲殿利[1] 李林山 

机构地区：[1]辽宁科技大学高温材料与镁资源工程学院,鞍山114051 [2]辽宁丰华实业有限公司,营口115100

出　　处：《人工晶体学报》2015年第1期115-121,共7页Journal of Synthetic Crystals

基　　金：国家科技支撑计划项目(2012BAB06B00)

摘　　要：本研究拟在氮化气氛下,以金属Al粉、Si粉、α-Al2O3为原料,添加Y2O3,耦合氮化反应制备β-Sialon。通过在不同温度下的氮化反应烧结试验,研究了Y3+对β-Sialon晶相组成、晶粒大小、晶格常数及显微结构的影响。采用XRD和SEM表征试样中的晶相和显微结构,利用X'Pert Plus软件对试样进行晶胞参数分析,通过Semiquantification法对试样各晶相组成进行计算。结果表明:随着温度的升高,合成β-Sialon相的含量不断提高,在1550℃时达到最高;添加Y2O3可以在相对较低温度条件下合成β-Sialon相,Y3+对Al3+的置换作用导致β-Sialon相结构畸变,且随耦合氮化反应烧成温度的升高,晶胞体积可由1350℃时的0.208448 nm3增大到1550℃时的0.236776 nm3,合成β-Sialon相呈现增加的趋势。同时在合成β-Sialon结构中,由于过量助烧结剂Y2O3易与原料中Al2O3形成针状YAG。In the atmosphere of nitrogen,adding Y2O3 as a sintering additive,β-Sialon was synthesized under solid-phase nitride couplied reaction,using Al metal powder,Si metal powder,α-Al2O3 as raw material. The effects of Y3 ＋at different temperatures on the composition,grain size,lattice parameters and microstructure of β-Sialon phase were studied. The crystalline phases and microstructure were determined by XRD and SEM respectively. The lattice parameters and crystallinity of the crystalline phases were estimated by X＇Pert plus software. The phase composition was evaluated by Semi-quantification method.The results show that as the temperature increasing, the content of synthesized β-Sialon phase is increasing and can be the most at 1550 ℃. When adding Y2O3,the β-Sialon phase can be synthesized at low-temperture,and the substitution of Al3 ＋by Y3 ＋lead to structural distortion of β-Sialon phase; as the temperature increases,the β-Sialon phase is increasing,and the grain size can increase from 0. 208448nm3 to 0. 236776 nm3. When the β-Sialon is synthesized,Y2O3 and Al2O3can be easily formed needle shape YAG.

关 键 词：Y2O3 Β-SIALON 晶格常数 耦合固相氮化反应 

分 类 号：TQ174[化学工程—陶瓷工业]