NH_4F及燃烧温度对燃烧合成长柱状Yb α-Sialon粉体的影响  

Effect of NH_4F and Temperature on Combustion Synthesis of Rod-Like Yb α-Sialon Powder

作　　者：葛振斌[1] 陈克新[1] 刘光华[1] 周和平[1] 傅仁利[1] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《稀有金属材料与工程》2004年第2期149-152,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50102002)

摘　　要：采用SHS法合成了Yb α-Sialon粉体,采用XRD和SEM分析和研究了添加剂NH_4F及燃烧温度对燃烧合成长柱状Yb α-Sialon相组成和形貌的影响。实验发现,在不同条件下,添加剂NH_4F对燃烧合成长柱状α-Sialon的晶体形貌可以起到抑制和促进两个相反的作用。温度越高,晶体生长速率越大,反应降温越慢,晶体生长时间越长,长柱状晶体生长越完整。燃烧合成得到的长柱状α-Sialon粉体,在室温下,以酒精为介质经过30min以上的超声分散,可以达到较好的分散效果。The effects of additive NH4F and reaction temperature on the combustion synthesis of single phase Yb α-Sialon powders with a characteristic of one-dimension elongated morphology were investigated. The results show that the NH4F play two opposite roles: either as promoter or as inhibitor. Both the high reaction temperature and the slow temperature decrease can promote the growth of rod-like crystals by accelerating the velocity and prolonging the growth time. The rod-like Yb α-Sialon powders can be dispersed by ultrasonic wave in alcohol.

关 键 词：燃烧合成 YB Α-SIALON 粉体 超声分散 

分 类 号：TQ174[化学工程—陶瓷工业]