Journal
JOURNAL OF RARE EARTHS
Volume 27, Issue 5, Pages 806-810Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(08)60339-7
Keywords
composite materials; carbothermal reduction; zircon; lanthanum oxide; rare earths
Categories
Funding
- National Natural Science Foundation of China [50274021]
- Baoshan Iron and Steel Co., Ltd.
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A study was carried out to determine the optimum parameters for synthesis of SiC-ZrO2 composite materials by carbothermal reduction of zircon. Test samples were prepared by mixing average mesh size of less than 30 mu m of carbon black and 40 mu m of zircon with C/ZrSiO4 mass ratio of 0.2 and the extra addition amount of La2O3 was 0, 1 wt.% and 2 wt.%. Prepared samples were subjected to the carbothermal reduction process at temperatures of 1723, 1753, 1773 and 1803 K for 4 h, respectively. The carbothermal reduction process was conducted in an atmosphere controlled tube furnace at an argon flow of 1.5 L/min. All products were examined by X-ray diffraction (XRD) to determine the transformation. The results showed that the best transformation of SiC-ZrO2 composite materials occurred at 1803 K for 4 h with the amount of 2 wt.%La2O3.
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