以硅粉和炭黑为原料,在N2气氛中通过燃烧合成制备出纳米SiC粉体。利用XRD、SEM等手段研究了N2压力、球料比、研磨时间等因素对燃烧合成反应的影响。结果表明,球料比和研磨时间对物料的反应程度影响显著。在球料比≥12.5∶1、球磨时间≥4 h的条件下,原料粉体可实现完全燃烧,生成产物主要为β-SiC,平均颗粒尺寸小于100 nm。在实验基础上,结合热力学分析,研究指出SiC是在N2催化作用下通过Si-C燃烧合成得到的,反应历程为：Si粉首先与N2反应生成Si3N4,同时放出大量的热,随着反应温度的升高,先生成的Si3N4发生分解,释放出的游离Si与C反应生成SiC。
Nanosized SiC powder was prepared by combustion synthesis in N2 atmosphere with starting materials of silicon powder and carbon black.The effects of N2 pressure,ball/powder mass ratio,and milling time on the combustion reaction were investigated by XRD and SEM.The results show that ball/powder mass ratio and milling time have significant influence on the reaction degree.When the ball/powder mass ratio is above 12.5∶1 and milling time is over 4 h,combustion reaction can be fully completed,and the major product is β-SiC with average particle size less than 100 nm.Based on experiments and thermodynamic analysis,it is proposed that combustion synthesis of SiC in N2 consists of two steps：（1） Si reacts with N2 to form Si3N4 and generate a lot of heat energy;（2） At higher temperatures the initially formed Si3N4 decomposes and released Si reacts with carbon to produce SiC.
参考文献
| [1] | Padture N P;Lawn B R .Toughness properties of a silicon carbide with an in-situ induced heterogeneous structure[J].Journal of the American Ceramic Society,1994,77(10):2518-2522. |
| [2] | You Zhou;Kiyoshi Hirao;Yukihiko Yamauchi;Shuzo Kanzaki .Effects of rare-earth oxide and alumina additives on thermal conductivity of liquid-phase-sintered silicon carbide[J].Journal of Materials Research,2003(8):1854-1862. |
| [3] | Nagano T.;Zhan GD.;Mitomo M.;Kaneko K. .Superplasticity of liquid-phase-sintered beta-SiC with Al2O3-Y2O3-AlN additions in an N-2 atmosphere[J].Journal of the American Ceramic Society,2000(10):2497-2502. |
| [4] | Borrero-Lopez O;Ortiz A L;Guiberteau F et al.Effect of liquid-phase content on the contact-mechanical properties of liquid-phase-sintered SiC[J].Journal of the European Ceramic Society,2007,27(06):2521-2527. |
| [5] | Strecker K;Hoffmann M J .Effect of A1N-content on the microstmcture and fracture toughness of hot-pressed and heat-treated LPS-SiC ceramics[J].Journal of the European Ceramic Soclety,2005,25(06):801-807. |
| [6] | Hong Peng;David Salamon;Joachim Bill;Georg Rixecker;Zaklina Burghard;Fritz Aldinger;Zhijian Shen .Consolidating and Deforming SiC Nanoceramics Via Dynamic Grain Sliding[J].Advanced Engineering Materials,2007(4):303-306. |
| [7] | Krstic V D .Production of fine,high-purity beta silicon carbide powders[J].Journal of the American Ceramic Society,1992,75(01):170-174. |
| [8] | Merzhanov A G .History and recent developments in SHS[J].Ceramics International,1995,21(05):371-379. |
| [9] | Munir Z A;Anselmi-Tamburini U .Self-propagating exothermic reactions:the synthesis of high-temperature materials by combustion [J 1[J].Materials Science Reports,1989,3(7-8):277-365. |
| [10] | Moore John J;Feng H J .Combustion synthesis of advanced materials:Part I.Reaction parameters[J].Progress in Materials Science,1995,39(4-5):243-273. |
| [11] | Ramesh P D;Vaidhyanathan B;Ganguli Munia et al.Synthesis of SiC powder by microwave radiation[J].Journal of Materials Research,1994,9(12):3025-3027. |
| [12] | Feng A;Munir Z A .Field-assisted self-propagating synthesis of SIC[J].Journal of Applied Physics,1994,76(03):1927-1928. |
| [13] | Kun Yang;Yun Yang;Zhi-Ming Lin;Jiang-Tao Li;Ji-Sheng Du .Mechanical-activation-assisted combustion synthesis of SiC powders with polytetrafluoroethylene as promoter[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,2007(9):1625-1632. |
| [14] | Novozilov B V .Non-linear SHS phenomena:Experiments,theory,numerical[J].Pure and Applied Chemistry,1992,64(07):955-964. |
| [15] | Mukasyan Alexander S.;Rogachev Alexander S. .Mechanisms of Pulsating Combustion During Synthesis of Advanced Materials[J].AIChE Journal,1999(12):2580-2585. |
| [16] | Shkadinskii K G;Khaikin B I;Merzhanov A G .Propagation of a pulsating exothermic reaction front in the condensed phase[J].Combustion Explosion and Shock Waves,1971,7(01):15-22. |
| [17] | Kata D.;Pampuch R.;Lis J. .COMBUSTION SYNTHESIS OF MULTIPHASE POWDERS IN THE SI-C-N SYSTEM[J].Solid state ionics,1997(1):65-70. |
| [18] | D.Kata;J.Lis .Silicon Nitride Rapid Decomposition for Ceramic Nanopowder Manufacturing[J].Glass Physics and Chemistry: A Journal on the Structural, Physical, and Chemical Properties and Nature of Inorganic Glasses and Glass-Forming Melts,2005(3):364-369. |
| [19] | 程兰征;章燕豪.物理化学[M].上海:上海科学技术出版社,1997 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%