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气化炉渣合成Ca-α-Sialon-SiC复相陶瓷

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Abstract:

利用X射线荧光分析仪、X射线衍射仪、扫描电子显微镜等研究了Texaco气化炉炉渣的化学组成、物相组成和显微结构。以气化炉渣为原料,分别在1350,1400,1450℃和1500℃4种氮化温度下碳热还原氮化,利用物相确定和显微结构分析等研究了氮化温度对反应的影响。以1450℃氮化产物为原料,热压制备了Ca-α-sialon-SiC复相陶瓷,并对此材料的力学性能进行了检测。结果表明(1)Texaco气化炉炉渣主要化学成分为SiO2,Al2O3,CaO和残余碳,其中大多为玻璃相和无定形物质;(2)低温氮化产物主晶相为β-sialon和Ca-α-sialon,高温氮化产物主晶相为Ca-α-sialon和SiC,提高氮化温度更有利于CaO固溶于sialon形成Ca-α-sialon,在1450℃碳热还原氮化可合成主要成分为Ca-α-sialon和SiC的复相粉体;(3)随着热压温度的升高,Ca-α-sialon-SiC复相陶瓷致密化程度增加,硬度和断裂韧性均有提高,添加剂对材料的力学性能影响较大,添加3%(质量分数,下同)Y2O3+2%MgO,1650℃热压制备的复相陶瓷的Vickers硬度可达18GPa,断裂韧性为5.2MPa?m1/2。

References

[1]  赵杰, 赵敏, 谢秋野. 国内外整体煤气化联合循环电厂发展概况及我国建设条件分析[J]. 中国电力, 2006, 39(4): 43-46. ZHAO Jie, ZHAO Min, XIE Qiuye. Electr Power (in Chinese), 2006, 39(4): 43-46. [2] 黄戒介, 房倚天, 王洋. 现代煤气化技术的开发与进展[J]. 燃料化学学报, 2002, 30(5): 385-391. HUANG Jiejie, FANG Yitian, WANG Yang. J Fuel Chem Technol (in Chinese), 2002, 30(5): 385-391. [3] WAGNER N J, MATJIE R H, SLAGHUIS J H, et al. Characterization of unburned carbon present in coarse gasification ash [J]. Fuel, 2008, 87: 683-691. [4] WU T, GONG M, LESTER E, et al. Characterization of residual carbon from entrained-bed coal water slurry gasifiers [J]. Fuel, 2007, 86: 972-982. [5] ACOSTA A, AINETO M, IGLESIAS I, et al. Physico-chemical characterization of slag waste coming from GICC thermal power plant [J]. Mater Lett, 2001, 50: 246-250. [6] MATJIE R H, ALPHEN C van, PISTORIUS P C. Mineralogical characterization of Secunda gasifier feedstock and coarse ash [J]. Miner Eng, 2006, 19: 256-261. [7] ACOSTA A, IGLESIAS I, AINETO M, et al. Utilisation of IGCC slag and clay steriles in soft mud bricks (by pressing) for use in building bricks manufacturing [J]. Waste Manag, 2002, 22: 887-89. [8] HASAN Mandal. New developments in α-Sialon ceramics [J]. J Eur Ceram Soc, 1999, 19(13-14): 2349-2357. [9] WANG P L, ZHANG C, SUN W Y, et al. Characteristics of Ca-α- sialon-phase formation, microstructure and mechanical properties [J]. J Eur Ceram Soc, 1999, 19(5): 553-560. [10] ZHANG C, NARIMATSU E, KOMEYA K, et al. Control of grain morphology in Ca-α-sialon ceramics by changing the heating rate [J]. Mater Lett, 2000, 43(5-6): 315-319. [11] ZHANG Y, CHENG Y B, LATHABAI S. Influence of micro-structure on the erosive wear behavior of Ca-α-sialon materials [J]. J Eur Ceram Soc, 2001, 21(13): 2435-2445. [12] HASAN Mandal, DEREK, THOMPSON. α→β-Sialon transformation in calcium containing α-sialon ceramics [J]. J Eur Ceram Soc, 1999, 19(5): 543-552. [13] HARRIS D J, ROBERTS D G, HENDERSON D G. Gasification behaviour of Australian coals at high temperature and pressure [J]. Fuel, 2006, 85: 134-142. [14] GAZZARA C P, MESSIER P R. Determination of phase content of Si3N4 by X-ray diffraction of analysis [J]. Am Ceram Soc Bull, 1977, 56: 777-780. [15] YE F, LIU L M, ZHANG H J, et al. Refractory self-reinforced Y-α-sialon with barium aluminosilicate glass ceramic addition [J]. Mater Sci Eng A, 2008, 488: 352-357.

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