Catalytic Preparation of Si3N4-Bonded SiC Refractories and Their High-Temperature Properties
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Effects of Cr2O3 nanoparticles (NPs) on the catalytic nitridation of Si powders were investigated, and the results showed that the Cr2O3 NP catalysts enhanced the nitridation of Si powders and promoted the formation of Si3N4 whiskers. The complete conversion of Si was achieved at [1473 K (1200 °C)] for 3 hours with the addition of 3 wt pct Cr2O3 NPs. First-principle calculations suggested that the electron transfer from Cr2O3 to N2 molecules facilitates the Si nitridation. Moreover, Si3N4-bonded SiC refractories were also prepared using in-situ formed Cr2O3 NPs as catalysts, and the hot modulus of rupture at [1673 K (1400 °C)] of as-prepared refractories was about three times higher than that of samples without catalysts; the corrosion resistance against molten cryolite of the former was remarkably lower than that of the latter. The improvement was attributed to the catalytic effects of Cr2O3 NPs for in-situ formation of a fund of Si3N4 whiskers, which formed a network structure in the samples.
This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51472185, 51502216, and 51672194), the Program for Innovative Teams of Outstanding Young and Middle-aged Researchers in the Higher Education Institutions of Hubei Province (Grant No. T201602), and the Key Program of the Natural Science Foundation of Hubei Province (Grant No. 2017CFA004).
- 8.J.T. Huang, Z.H. Huang, S.W. Zhang, M.H. Fang, and Y.G. Liu: J. Nanomater., 2014, vol. 2014, pp. 1–6.Google Scholar