Phase composition of SiC-ZrO_2 composite materials synthesized from zircon doped La_2O_3
来源期刊：JOURNAL OF RARE EARTHS2009年第5期
论文作者：YU Jingkun MA Beiyue
Key words：composite materials; carbothermal reduction; zircon; lanthanum oxide; rare earths;
Abstract: A study was carried out to determine the optimum parameters for synthesis of SiC-ZrO_2 composite materials by carbothermal re-duction of zircon. Test samples were prepared by mixing average mesh size of less than 30 μm of carbon black and 40 μm of zircon with C/ZrSiO_4 mass ratio of 0.2 and the extra addition amount of La_2O_3 was 0, 1 wt.% and 2 wt.%. Prepared samples were subjected to the car-bothermal 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-ZrO_2 composite materials occurred at 1803 K for 4 h with the amount of 2 wt.%La_2O_3.
YU Jingkun1，MA Beiyue1
(1.School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China)
Abstract:A study was carried out to determine the optimum parameters for synthesis of SiC-ZrO_2 composite materials by carbothermal re-duction of zircon. Test samples were prepared by mixing average mesh size of less than 30 μm of carbon black and 40 μm of zircon with C/ZrSiO_4 mass ratio of 0.2 and the extra addition amount of La_2O_3 was 0, 1 wt.% and 2 wt.%. Prepared samples were subjected to the car-bothermal 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-ZrO_2 composite materials occurred at 1803 K for 4 h with the amount of 2 wt.%La_2O_3.
Key words:composite materials; carbothermal reduction; zircon; lanthanum oxide; rare earths;
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