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A facile strategy for fabricating self-sealing dense coating grown in-situ on porous silicon nitride ceramics
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2020-10-25 , DOI: 10.1016/j.jeurceramsoc.2020.10.040
Wenjiu Duan , Dechang Jia , Delong Cai , Bo Niu , Zhihua Yang , Yu Zhou

This present work explores initially the feasibility of producing in-situ surface oxidized coating on porous silicon nitride (Si3N4) ceramics. Theoretical prediction identifies the applied conditions of self-sealing strategy and oxidation time required to form dense coating. Experimentally, the porous Si3N4 ceramics with different pore structures were selected to fabricate in-situ oxidized coatings. The phase compositions, microstructures and mechanical properties of the porous Si3N4 ceramics were investigated before and after oxidation. The results show that flat and dense coatings are prevailed in all samples, which consist of amorphous SiO2 and its precipitates besides dominant Si3N4 phase. The strengthened substrate and strengthening effect of coating are the essential mechanisms associated with the improved mechanical properties. Self-sealing method seems to offer an inexpensive and efficient route to prepare coating on porous Si3N4 ceramics.



中文翻译:

制备在多孔氮化硅陶瓷上原位生长的自密封致密涂层的简便策略

本工作最初探讨了在多孔氮化硅(Si 3 N 4)陶瓷上生产原位表面氧化涂层的可行性。理论预测确定了自密封策略的应用条件以及形成致密涂层所需的氧化时间。实验上,选择具有不同孔结构的多孔Si 3 N 4陶瓷来制备原位氧化涂层。研究了氧化前后Si 3 N 4多孔陶瓷的相组成,微观结构和力学性能。结果表明,所有样品均覆盖了平整致密的涂层,其中包含无定形SiO 2除主要的Si 3 N 4相外,其析出物。增强的基材和涂层的增强效果是与改善的机械性能相关的基本机制。自密封方法似乎提供了一种廉价而有效的方法来在多孔Si 3 N 4陶瓷上制备涂层。

更新日期:2020-12-01
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