Effect of Fe2O3 additive on the preparation of Si3N4−Si2N2O composite ceramics via diamond‐wire saw silicon waste

Author:

Fang Zheyu12,Sun Yue12,Mi Zhishan3,Jin Xing1,Ran Songlin2

Affiliation:

1. Key Laboratory of Metallurgical Emission Reduction and Resources Recycling Ministry of Education Anhui University of Technology Maanshan China

2. Anhui Province Key Laboratory of Metallurgical Engineering and Resources Recycling Anhui University of Technology Maanshan China

3. Material Digital R&D Center China Iron and Steel Research Institute Group Beijing China

Abstract

AbstractIn this study, Si3N4−Si2N2O composite ceramics were prepared through a two‐step combination of the direct nitriding method and spark plasma sintering method with diamond‐wire saw silicon waste in the photovoltaic industry as raw material. The whole holding time at the constant temperature of the preparing process only lasts 35 min, in which the nitriding time only takes 30 min and the sintering time only takes 5 min. The effects of the Fe2O3 additive on the nitriding and sintering process were investigated in detail. The results show that the Fe2O3 additive accelerates the nitriding process by promoting the formation and diffusion of the gas phase and reducing the apparent activation energy of the reaction between the gas phase containing silicon and N2. Meanwhile, the Fe2O3 additive also promotes the sintering process by lowering the eutectic temperature of the SiO2−Al2O3 and the SiO2−Y2O3 binary system. The optimal technical parameters follow the nitriding temperature of 1400°C, the nitriding time of 30 min, the sintering temperature of 1800°C, and the sintering time of 5 min. The Si3N4−Si2N2O composite ceramic prepared under the above conditions exhibits good performance with an apparent porosity of 2.7%, Vickers hardness of 16.54 GPa, and fracture toughness of 4.1 MPa·m1/2.

Funder

Natural Science Foundation of Anhui Province

Publisher

Wiley

Subject

Materials Chemistry,Marketing,Condensed Matter Physics,Ceramics and Composites

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Purification and preparation of pure SiC with silicon cutting waste;Journal of Environmental Management;2024-07

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