Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (11): 1364-1371.DOI: 10.11944/j.issn.1000-0518.2018.11.170414

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Preparation of High-Purity Silicon Nitride from Diamond-Wire Cutting Waste

JIN Xing,KONG Jian,WANG Jingqiang,XING Pengfei(),GAO Bo   

  1. School of Materials Science and Engnieering,Northeastern University,Shenyang 110000,China
  • Received:2017-11-17 Accepted:2018-02-05 Published:2018-10-31 Online:2018-10-31
  • Contact: XING Pengfei
  • Supported by:
    Supported by the National Basic Research Program(973 Program)(No.51334004)

Abstract:

Silicon nitride was prepared through nitriding the diamond-wire cutting waste, which not only recycles the diamond-wire cutting waste but also improves the environment. The influence of HCl and HF on the phase composition, component content and microtopography of nitride products were analyzed by X-ray diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS). The results show that the phases in nitride samples fabricated from the HCl-soaked cutting waste are mainly Si2N2O and Si3N4. However, the phases in nitride samples fabricated from the HF-soaked cutting waste is mostly Si3N4. Si2N2O in nitride samples is related to the mass fraction of SiO2 in cutting waste, and the precondition of producing Si3N4 from cutting waste by high temperature nitriding is to reduce the mass fraction of SiO2 in cutting waste.

Key words: diamond-wire cutting waste, acid leaching, silicon nitride, recycle