期刊
CERAMICS INTERNATIONAL
卷 40, 期 7, 页码 11063-11070出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.03.122
关键词
alpha-Si3N4; Nanorods; Nitridation of silicon; Cobalt catalyst; Growth mechanisms
资金
- National Natural Science Foundation of China [51032007]
The catalytic effects of cobalt (Co) on the direct nitridation of silicon (Si) and morphologies of the nitridation products were investigated, and the relevant reaction mechanisms were proposed. The overall conversion of Si to silicon nitride (Si3N4) was dramatically improved with increasing the nitridation temperature from 1300 to 1350 degrees C. Co played an important role in accelerating the Si nitridation as well as the in-situ growth of alpha-Si3N4 nanorods, via the formation of Co Si liquid phase. At 1350 degrees C, the overall conversion in the reference sample without Co was only 54%, whereas it exceeded 90% in the sample containing 1.25 wt% Co. When the Co addition was more than 7.5 wt%, alpha-Si3N4 nanorods of 80-120 nm in diameter and 800-1600 nm in length became the main product phase. The growth processes of the nanorods with and without nanoparticles (caps) at their tips were governed respectively by vapor-liquid-solid and vapor-vapor-solid mechanisms. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据