Si3N4-ZrO2-La2O3系统反应合成ZrN及相图构建  

Reaction Synthesis of ZrN and Phase Diagram in the Si3N4-ZrO2-La2O3 System

作　　者：李彦瑞 陆有军[1] 刘洋 袁振侠 黄振坤[1] LI Yanrui;LU Youjun;LIU Yang;YUAN Zhenxia;HUANG Zhenkun(School of Materials Science and Engineering,North Minzu University,Yinchuan 750021,China)

机构地区：[1]北方民族大学材料科学与工程学院,银川750021

出　　处：《无机材料学报》2020年第7期822-826,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金项目(51662002,51762002);宁夏重点研发计划项目(2018YBZD0625)。

摘　　要：本工作研究了Si3N4-ZrO2-La2O3三元系统的相关系,采用X射线衍射仪分析了物相组成。结果表明,在1500℃/1 h/N2气氛条件下固相反应,生成了ZrN和La4.67Si3O13、La5Si3NO12、La4Si2N2O7、LaSiNO2、La2Zr2O7等镧盐化合物的共存相。由于生成的氮化锆和硅酸镧等化合物不在Si3N4-ZrO2-La2O3三元系统内,需引入SiO2测定SiO2-La2O3-ZrO2三元分系统相图,进而扩大成Si3N4-ZrO2-La2O3-SiO2-ZrN五元系统,本工作绘制并提出了此五元系统相图,且提出了1570℃时SiO2-La2O3-ZrO2三元分系统实验相图。此外,验证了La2O3在Si3N4-ZrO2-La2O3三元系统反应中促进Si3N4-ZrO2取代反应生成ZrN的作用。Si3N4-ZrO2-La2O3 ternary system were prepared via solid-state reaction at 1500℃for 1 h with N2 protection,yielding coexistence phase of ZrN and lanthanum-based compounds,such as La4.67Si3O13,La5Si3NO12,La4Si2N2O7,LaSiNO2,and La2Zr2O7.Since the generated ZrN and lanthanum-based compounds are not located on the triangle plane of Si3N4-ZrO2-La2O3 system,it is necessary to add SiO2 to extend the ternary into quinary system of Si3N4-SiO2-La2O3-ZrO2-ZrN.After the phase diagram of this quinary system is confirmed and presented,the phase diagram of La2O3-SiO2-ZrO2 ternary subsystem at 1570℃is further proposed for the first time.In addition,La2O3 in the Si3N4-ZrO2-La2O3 ternary system can help to simulate the substitution reaction between Si3N4 and ZrO2 to produce ZrN.

关 键 词：氮化锆 相关系 固相反应 复相陶瓷 

分 类 号：TQ174[化学工程—陶瓷工业]