Effect of electric field on the structure of SiCN pyrolyzed at 1600 °C
Effect of electric field on the structure of SiCN pyrolyzed at 1600 °C
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DOI：
10.1016/j.ceramint.2024.01.234
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发表时间：
2024-01
影响因子：
5.2
通讯作者：
Jilin Chen;Boyan Sun;He Wu;Kewei Wang;Baisheng Ma;K. Ren;Lei Chen
中科院分区：
文献类型：
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作者：
Jilin Chen;Boyan Sun;He Wu;Kewei Wang;Baisheng Ma;K. Ren;Lei Chen
电场的施加会影响陶瓷的相变和烧结条件。本文研究了电场对1600℃热解SiCN相结构演变的影响，并与常规无压热解SiCN进行了比较。通过x射线衍射、x射线光电子能谱、透射电镜和拉曼光谱对其结构信息进行了表征。结果表明，常规无压热解制备的SiCN陶瓷主要由SiC、si3n4和自由碳相组成，而电场辅助热解制备的SiCN陶瓷主要由si3n4和自由碳相组成。电场辅助法热解的SiCN陶瓷中未检测到SiC结晶，说明电场影响了si3n4与C相的碳热反应，改变了SiC的形成机理。此外，电场促进了游离碳相的结构有序重排，增加了其中的缺陷含量。
Application of electric field is known to influence the phase transformation and sintering conditions of ceramics. In this work, the effect of electric field on the phase structure evolution of SiCN pyrolyzed at 1600 °C was studied in comparison with conventional pressureless pyrolyzed SiCN. The structural information was characterized via X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and Raman spectroscopy. It was found that SiCN ceramic prepared via conventional pressureless pyrolysis was composed of SiC, Si3N4and free carbon phases, while that produced via electric field-assisted pyrolysis consisted of Si3N4and free carbon phases. No crystalline SiC was detected in SiCN ceramic pyrolyzed via the field-assisted method, indicating that the electric field affected the carbothermal reaction between Si3N4and C phases and changed the formation mechanism of SiC. Moreover, the electric field promoted structural ordering rearrangement of the free carbon phase and increased the defect content therein.