Abstract
Diamond wire cutting polysilicon waste powder is a potential raw material for the preparation of α-Si3N4 fibers with its ultra-fine particle size and high reactivity. In this study, a new method for the preparation of α-Si3N4 fibers by additive-assisted nitridation was proposed, and the effects of type and content of additives, temperature and time on the nitridation of polysilicon waste powder were investigated in detail. The experimental results showed that compared to the samples without additive assistance, the samples containing 50 wt.% additive can obtain silicon nitride powders dominated by α-Si3N4 fibers after nitriding at 1250 °C for 8 h. Moreover, the growth of α-Si3N4 fibers obeys the VS mechanism. The decomposition of urea and melamine at low temperature produces a large number of pores, which in turn promotes the nitridation of polysilicon waste powder. The addition of α-Si3N4 acts as a diluent on the one hand, and provides nucleation conditions for the growth of α-Si3N4 fibers on the other.
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This work was supported by the National Natural Science Foundation of China (51734002).
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Hou, Y., Zhang, GH. & Lv, XW. Preparation of silicon nitride fibers by additive-assisted nitridation of polysilicon waste powder. J Aust Ceram Soc 60, 533–541 (2024). https://doi.org/10.1007/s41779-023-00967-8
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DOI: https://doi.org/10.1007/s41779-023-00967-8