| Title | Synthesis of α-Si3N4 Powder by Molten Salt Catalytic Nitridation |
| Thematic area | Other Industries |
| Presenter | Dr. Jun Ding |
| Authors | Miss Zhinan Chai, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Dr. Jun Ding, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Prof. Chengji Deng, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Prof. Hongxi Zhu, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Dr. Chao Yu, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Mr. Xiaoqing Kan, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China |
|
Abstract
In this paper, it was intended that reducing the cost of Si3N4 powder according to the application prospect of Si3N4 ceramic. Using Fe micro powder as catalyst, the α-Si3N4 powder was prepared by molten salt catalytic nitridation in the NaCl-NaF molten salt media. The effects of nitridation temperatures and the content of catalyst on nitridation of Si powder were investigated. Moreover, the composition and microstructure of samples were characterized by XRD, XPS, SEM and TEM. The results showed that addition of 2 wt% Fe powder, the nitridation of Si powder was completed after 5 h nitridation at 1250 °C in the NaCl-NaF eutectic salts. The crystal morphologies of as-prepared α-Si3N4 were in the presentation of anomalous and short rod in the samples. |
|