摘要
为了有效降低氮化硅粉体的合成温度,以硅粉为原料,分别以NaCl、KCl和NaCl-KCl复合熔盐为反应介质,Co、Cr、Ni和Fe为催化剂,采用高能球磨辅助熔盐氮化法,经1 200℃保温4 h制备了Si_3N_4粉体,研究了熔盐和催化剂的加入对硅粉氮化反应的影响。结果表明:在熔盐和硅粉质量比为2:1,氮化温度为1 200℃,保温时间为4 h的条件下,加入占硅粉质量2. 5%的Co为催化剂,NaCl、KCl、NaCl-KCl三个熔盐体系中的硅粉都实现了完全氮化; NaCl-KCl体系中Ni、Fe、Co、Cr催化剂的加入均促进了硅粉的氮化,其中Co和Cr的催化效果优于Ni和Fe的,Fe的催化效果略优于Ni的。
Si3N4 powders were synthesized by a combined high-energy ball milling and molten salt nitridation method using silicon powders as raw materials,NaCl,KCl,NaCl-KCl as reaction medium,Co,Cr,Ni and Fe as catalysts,and firing at 1200 ℃ for 4 h.The effect of molten salt and catalyst on the nitridation reaction of silicon powders was investigated.The results show that the nitridation of silicon powders in the three media of NaCl,KCl and NaCl-KCl is fully completed after nitridizing at 1200 ℃ for 4 h when the mass ratio of molten salt to silicon powders is 2:1 and the Co addition accounts for 2.5% of the silicon powder mass.The addition of Ni,Fe,Co and Cr in the NaCl-KCl medium all promotes the nitridation of silicon powders.The catalytic effect of Co and Cr is superior to that of Ni and Fe,and the catalytic effect of Fe is slightly better than that of Ni.
作者
张晶
李红霞
刘国齐
Zhang Jing;Li Hongxia;Liu Guoqi(State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China)
出处
《耐火材料》
CAS
北大核心
2019年第1期6-10,共5页
Refractories
基金
国家自然科学基金资助项目(51772277)
河南省联合基金重点支持项目(U1604252)
关键词
氮化硅
高能球磨
熔盐
催化剂
silicon nitride
high-energy ball milling
molten salt
catalyst