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Preparation and Characterization of Si3N4-TiN Nanocomposite via in situ Co-deposition in Liquid Ammonia
Mei Yang, Ming-li L?u, Hong-min Zhu*
Author NameAffiliationE-mail
Mei Yang School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100080, China  
Ming-li L?u School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100080, China  
Hong-min Zhu* School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100080, China hzhu@metall.ustb.edu.cn 
Abstract:
"A new method of TiN/Si3N4 nanocomposite synthesis was described and tested. TiCl4 and SiCl4 used as the starting materials and sodium as the reduction agent were conducted in liquid ammonia respectively. TiCl4 and SiCl4 were reduced simultaneously and titanium nitride/silicon nitride nanocomposite powderswere obtained by in situ co-deposition at temperatures around ~ 45 oC. X-ray diffraction patterns indicate that the product was amorphous and the by-product was sodium chloride. The product powders were heated up to 1600 oC and crystallization to TiN and fi-Si3N4 happened. Due to presence of TiN, the crystallization of silicon nitride in the mixture was later than that of pure silicon nitride. Transmission electron microscopy images show the average size of powders range from 10 nm to 40 nm and scanning electron microscopy images conformed that Ti and Si elements were dispersed uniformly. A green bulk nitride composite containing 20%TiN with the mean grain size of 100-300 nm and fracture toughness of 10.1§1.1 m1=2MPa , was obtained by spark plasma sintering at 1500-1600 oC. The effect of TiN additiven microstructure and mechanical properties of composite bulk was discussed."
Key words:  Titanium nitride, Silicon nitride, Nanopowders, Liquid ammonia, In situ, Co-deposition
FundProject:
液氨中原位制备Si3N4-TiN纳米复合材料及表征
杨梅,吕明利,朱鸿民*
摘要:
"提出了一种合成氮化钛/氮化硅(TiN/Si3N4)纳米复合材料的新方法.采用TiCl4和SiCl4作为原料,金属钠作为还原剂,以液氨为介质.在-45 ℃左右同时还原四氯化钛和四氯化硅,通过原位共沉淀获得TiN/Si3N4的纳米复合粉体.X射线衍射表明产物为非晶结构,副产物为氯化钠.产物粉末加热到1600 ℃晶化为TiN和ˉ-Si3N4.由于TiN的存在,混合粉末中的氮化硅晶化温度高于纯氮化硅的晶化温度.透射电镜照片显示粉末平均粒径在10~40 nm,扫描电镜照片表明钛、硅元素彼此均匀分布.在1500~1
关键词:  氮化钛,氮化硅,纳米粉,液氨,原位共沉淀
DOI:10.1088/1674-0068/20/06/717-720
分类号: