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李紫勇等:碳还原粉煤灰制备SiC/A,O,系复合材料 839 50 um 图11还原产物扫描电镜图(a)及A区放大图(b) Fig.11 SEM image of the reduction product (a)and the enlarged view of Area A (b) 50m Al-KA 50 Hm O-KA 50m Si-KA 50 jm C-K图 图12还原产物元素分布图 Fig.12 EDS elemental distribution of the reduction product 料,2008,42(1):1) 4结论 [4]Choa Y H,Nakahira A,Niihara K.Microstructure and mechani- (1)在粉煤灰中配入一定量的碳,在合适的温度 cal properties of SiC-platelet reinforced Al203/SiC-particle hybrid composites.J Mater Sci,2000,35:3143 条件下,保温足够长的时间,制备SiC/A,O,复合材料 [5]Niihara K.New design concept of structural ceramies-ceramics 是可行的 naocomposites.J Ceram Soc Jpn,1991,99:974 (2)粉煤灰中的石英相在1673K转化成碳化硅, [6]Davidge R W,Brook RJ.Cambier F,et al.Fabrication,proper- 莫来石相在1773K基本上生成碳化硅和氧化铝,随着 ties,and modeling of engineering ceramics reinforced with nanop- 反应温度的升高还原程度增大,生成的碳化硅和氧化 articles of silicon carbide.Br Ceram Trans,1997,96:121 铝含量增加,较合适的温度条件为1773~1873K;保温 7]Zhao J,Stearns L C,Harmer M P,et al.Mechanical behavior of 时间的延长,有利于碳化硅和氧化铝的生成,时间越长 alumina silicon-carbide nanocomposites.J Am Ceram Soc,1993, 76:503 生成量越大,较好的保温时间为3~4h;增加配碳量对 8]Akatsu T,Suzuki M,Tanabe Y,et al.Effects of whisker content 碳化硅和氧化铝的生成有促进作用,较合适的C/Si摩 and dimensions on the R-curve behaviour of an alumina matrix 尔比为4~5. composite reinforced with silicon carbide whiskers.J Mater Res, (3)碳还原粉煤灰制备的SiC/AL,O3复合材料, 2001,16:1919 碳化硅颗粒小于20m,并且在产物中分散较为均匀. ]Zhang C J.Jin ZZ.In-situ synthesis of ceramic composites. Mater Rev,1996,28:62 参考文献 (张国军,金宗哲.原位合成复相陶瓷概述.材料导报,1996, [1]Yu J H,Jiang D L.Development and application of silicon car- 28:62) bide ceramics.Ceram Eng,1998,32(3):3 [10]Yu J K,Hiragushi K.Synthesis of Al,O:-SiC composite from (余继红,江东亮.碳化硅陶瓷的发展与应用.陶瓷工程, pyrophyllite and clay and its application in carbon-containing re 1998,32(3):3) fractories.Taikabutsu,1998,50(7):375 2]Kim W,Oh H S,Shon I J.The effect of graphene reinforcement 01] Amroune A,Fantozzi G,Dubois J,et al.Formation of Al,O- on the mechanical properties of Al2 O ceramics rapidly sintered by SiC powder from andalusite and carbon.Mater Sci Eng A,2000, high-requency induction heating.Int J Refract Met Hard Mater, 290(1):11 2015,48:376 02] Ma B Y,Yu J K.The latest development of SiC-based compos- B]Zhong X C.Progress and development of oxide and nonoxide ites synthesized from natural raw materials.Rare Met Cemented composite materials.Refractories,2008,42(1):1 Carbides,2008,36(4):54 (钟香崇.氧化物一非氧化物复合材料研究开发进展.耐火材 (马北越,于景坤.天然原料合成碳化硅系复合材料的研究李紫勇等: 碳还原粉煤灰制备 SiC/Al2O3 系复合材料 图 11 还原产物扫描电镜图( a) 及 A 区放大图( b) Fig. 11 SEM image of the reduction product ( a) and the enlarged view of Area A ( b) 图 12 还原产物元素分布图 Fig. 12 EDS elemental distribution of the reduction product 4 结论 ( 1) 在粉煤灰中配入一定量的碳,在合适的温度 条件下,保温足够长的时间,制备 SiC /Al2O3 复合材料 是可行的. ( 2) 粉煤灰中的石英相在 1673 K 转化成碳化硅, 莫来石相在 1773 K 基本上生成碳化硅和氧化铝,随着 反应温度的升高还原程度增大,生成的碳化硅和氧化 铝含量增加,较合适的温度条件为 1773 ~ 1873 K; 保温 时间的延长,有利于碳化硅和氧化铝的生成,时间越长 生成量越大,较好的保温时间为 3 ~ 4 h; 增加配碳量对 碳化硅和氧化铝的生成有促进作用,较合适的 C / Si 摩 尔比为 4 ~ 5. ( 3) 碳还原粉煤灰制备的 SiC /Al2O3 复合材料, 碳化硅颗粒小于 20 μm,并且在产物中分散较为均匀. 参 考 文 献 [1] Yu J H,Jiang D L. Development and application of silicon car￾bide ceramics. Ceram Eng,1998,32( 3) : 3 ( 余继红,江东亮. 碳化硅陶瓷的发展与应用. 陶 瓷 工 程, 1998,32( 3) : 3) [2] Kim W,Oh H S,Shon I J. The effect of graphene reinforcement on the mechanical properties of Al2O3 ceramics rapidly sintered by high-frequency induction heating. Int J Refract Met Hard Mater, 2015,48: 376 [3] Zhong X C. Progress and development of oxide and non-oxide composite materials. Refractories,2008,42( 1) : 1 ( 钟香崇. 氧化物--非氧化物复合材料研究开发进展. 耐火材 料,2008,42( 1) : 1) [4] Choa Y H,Nakahira A,Niihara K. Microstructure and mechani￾cal properties of SiC-platelet reinforced Al2O3 / SiC-particle hybrid composites. J Mater Sci,2000,35: 3143 [5] Niihara K. New design concept of structural ceramics-ceramics naocomposites. J Ceram Soc Jpn,1991,99: 974 [6] Davidge R W,Brook R J,Cambier F,et al. Fabrication,proper￾ties,and modeling of engineering ceramics reinforced with nanop￾articles of silicon carbide. Br Ceram Trans,1997,96: 121 [7] Zhao J,Stearns L C,Harmer M P,et al. Mechanical behavior of alumina silicon-carbide nanocomposites. J Am Ceram Soc,1993, 76: 503 [8] Akatsu T,Suzuki M,Tanabe Y,et al. Effects of whisker content and dimensions on the R-curve behaviour of an alumina matrix composite reinforced with silicon carbide whiskers. J Mater Res, 2001,16: 1919 [9] Zhang G J,Jin Z Z. In-situ synthesis of ceramic composites. Mater Rev,1996,28: 62 ( 张国军,金宗哲. 原位合成复相陶瓷概述. 材料导报,1996, 28: 62) [10] Yu J K,Hiragushi K. Synthesis of Al2O3 --SiC composite from pyrophyllite and clay and its application in carbon-containing re￾fractories. Taikabutsu,1998,50( 7) : 375 [11] Amroune A,Fantozzi G,Dubois J,et al. Formation of Al2O3 -- SiC powder from andalusite and carbon. Mater Sci Eng A,2000, 290( 1) : 11 [12] Ma B Y,Yu J K. The latest development of SiC-based compos￾ites synthesized from natural raw materials. Rare Met Cemented Carbides,2008,36( 4) : 54 ( 马北越,于景坤. 天然原料合成碳化硅系复合材料的研究 · 938 ·
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