Investigation of Sodium effect on synthesis of Si3N4 by using carbothermal reduction and nitridation process from MCM-48/Saccharose precursor
Subject Areas :Ali Ghalamzan 1 , Amirabbas Nourbakhsh 2 , Farshad Alafghalamzan 3 , Akbar Chami 4
1 - کارشناس ارشد، دانشکده مهندسی مواد، واحد نجف آباد، دانشگاه آزاد اسلامی
2 - دانشیار، دانشکده فنی و مهندسی، واحد شهرضا، دانشگاه آزاد اسلامی،شهرضا
3 - کارشناس ارشد، دانشگاه یزد، دانشکده علوم، یزد
4 - کارشناسی ارشد، دانشکده مواد، واحد نجف آباد، دانشگاه آزاد اسلامی
Keywords: Silicon Nitride, Carbothermal and Nitridation, Mesoporouse,
Abstract :
In this research, the effect of sodium additive on silicon nitride synthesis has been investigated via carbothermal reduction and nitridation procedures, by using MCM-48 silicate precursor, and saccharose as a carbon agent. In this study, at first mesoporouse silicate has been synthesised, and then binary mixture was prepared by solving MCM-48 and saccharose in deyonized water. In order to investigate the effect of sodium additives, triple systems were prepared by sodium additive (in 1, 2 or 3 weight percent range) in the same time with binary mixtures. Then in temperature of 1400°C nitridation were performed under nitrogen gas atmosphere. Characterization of physical and microstructural properties of mesoporouse silicate and silicon nitride samples performed by various techniques likely X- Ray Diffraction, Scanning Electron Microscopy and Transmission Electron Microscopy. Results shows adding sodium cause to decreasing of liquid phases creating temperature and covering MCM-48 surfaces with this phases and will be prevent the formation of silicon nitride. Also filling the pores with liquid phases cause to prevent the formation of porouse structure.
[1] K. H. Jack & W. I. Wilson, “Ceramics based on the Si–Al–ON and related systems”, Nature, Vol. 28, pp. 281–239, 1972.
[2] F. Wang, F. Qin, G. Qiang Jin, W. Yong & X. Yun Guo, “synthesis and characterization of Si3N4 thin nanobelts via direct nitridation of Si powder”, Vol. 41, pp. 120-123, 2008.
[3] M. V. Vlasova, T. S. bartnitskaya, L. L. Sukhikh, L. A. Tomila & T. V. Krushinskaya, “mechanism of Si3N4 nucleation during carbothermal reduction of silica”, journal of materials science, Vol. 30, pp. 5263 - 5271, 1995.
[4] Q. Yong-Xin, L. Mu-Sen, W. Cheng-Gao, B. Yu-Jin, B. Zhu & W.Yan-Xiang, “low-temperature preparation of silicon nitride via chemical metathesis route”, materials letters, Vol. 58,pp. 3345-3347, 2004.
[5] Y. Zhao, Q. Liu & H. Zhou, “synthesis of pure rod- like α-Si3N4 powder with in situ C/SBA-15 composite, ceramics international”, Vol. 38, pp. 6059-6062, 2012.
[6] A. K. waterw, A. Sawka & D. K. watera, “amorphous Si3N4 layers synthesized on cemented carbide tools using an atmospheric pressure CVD method,surface and coatings technology”, Vol. 88, pp. 12-16, 1996.
[7] T. Kawahito & T. Iwai, “Poroceeding of the International Symposium on Ceramic Components for Engines”, pp. 333, 1983.
[8] D. Gu, F. Zhang, Y. Shi, Y. Zhang, F. Wu, Z. Deng, Y. Zhang, L. Tu & B. Zhao, “teardown method to create large mesotunnels on the pore walls of ordered mesoporous silica”, J. Colloidand Interface Science, Vol. 328, pp. 338-343, 2008.
[9] X. Zhao, S. Lu & G. Q, “Nanoporous materials-science and engineering”, Imperial College Press, londan, Vol. 4, pp. 6-11, 2004.
[10] K. H. Jack, “The Fabrication of Dense Nitrogen Ceramics Processing of Crystalline Ceramics”, Materials Science Research, Plenum, Vol. 11, pp. 561, 1978.
[11] R. K. Iler, “The chemistry of silica: solubility, polymerizatio colloid and surface properties biochemistry”, John Wiley & Sons, 1979.
[12] W. D. B. I. Parsonsand & D. S. Montgometry, Mine Branch Technical Survey, TB26, 1961.
[13] S. J. Gregg & K. S. W. Sing, “Adsorption, Surface Area and Porosity”, Academic Press, London, 1982.
Y. G. Cao, H. Chen, G. T. Li, C. C. Ge, S. Y. Tang, J. X. Tang & X. Chen, “formation of α -Si3N4 whiskers with addition of NaN3 as catalyst”, journal of crystal growth, Vol. 234, pp. 9-11, 2002.
