Y2O3 ve Er2O3-katkılı α/β/-SiAlON Seramiklerinin Oksidasyon Davranışları

Yıl 2019, Cilt: 7 Sayı: 3, 381 - 388, 28.09.2019

Ali Çelik

https://doi.org/10.21541/apjes.515667

Öz

SiAlON seramikleri metal ergitme işleminde kullanılan refrakterler ve metallerin yüksek kesme hızlarında talaşlı imalatında kullanılan kesici takımlar gibi yüksek sıcaklık özelliklerinin ön planda olduğu uygulamalarda başarıyla kullanılan malzemelerdir. Bu malzemelerin oksidasyon ve korozyon direnci gibi yüksek sıcaklık özellikleri ise mikroyapısal özellikleri, faz özellikleri ve kullanılan nadir toprak (RE) elementleri ile belirlenmektedir. Bu çalışmada ve sağladığı yüksek oksidasyon direnci ile SiAlON seramiklerinin üretiminde en yaygın kullanılan nadir toprak elementi oksitlerinden bir tanesi olan Y2O3 ile birlikte önemli bir potansiyele sahip olan Er2O3 ilaveleri kullanılarak hazırlanan α/β-SiAlON seramiklerinin kıyaslamalı oksidasyon davranışları incelenmiştir. Oksidasyon direnci açısından her iki ilavenin benzer özelliklere sahip olduğu, farklılığın ise tane sınırı fazlarının kristalizasyon derecelerinden kaynaklandığı bulunmuştur.

Anahtar Kelimeler

Oksidasyon, SiAlON, Nadir toprak elementler

Oxidation Behavior of Y2O3 and Er2O3-doped-α/β-SiAlON Ceramics

Öz

SiAlON ceramics are successfully utilized in applications such as refractories used for metal melting and cutting tools for high speed machining of metals in which high temperature properties are important. As being one of the main indication of high temperature resistance for such applications, oxidation resistance of this materials are affected by microstructural features, type and amount of the rare-earth (RE) elements in α-SiAlON and grain boundary phase (GBP). In this study, oxidation behavior of α/β-SiAlON ceramics prepared by Er2O3 as well as Y2O3, which is one of the most widely used RE-oxide in commercial SiAlON compositions, was investigated comparatively. A slight difference was observed in oxidation resistance of Er2O3 and Y2O3 containing SiAlON ceramics due to their slightly different crystallinity of GBPs.

Anahtar Kelimeler

Oxidation, SiAlON, Rare-earth elementOxidation

Kaynakça

• D. Hardie and K. H. Jack, “Crystal structures of silicon nitride,”, Nature, vol. 180, no. 4581, pp. 332–333, 1957.
• I. W. Chen and A. Rosenflanz, “A tough SiAlON ceramic based on α-Si3N4 with a whisker-like microstructure,”, Nature, vol. 389 (6652), pp. 701–704, 1997.
• T. Ekström and M. Nygren, “SiAION ceramics,”, J. Am. Ceram. Soc., vol. 75, no. 2, pp. 259–276, 1992.
• N. C. Acikbas, H. Yurdakul, H. Mandal, F. Kara, S. Turan, A. Kara, and B. Bitterlich, “Effect of sintering conditions and heat treatment on the properties, microstructure and machining performance of α-β-SiAlON ceramics,”, J. Eur. Ceram. Soc., vol. 32, no. 7, 1321–1327, 2012.
• A. Çelik, M. S. Alağaç, S. Turan, A. Kara, and F. Kara, “Wear Behavior of solid SiAlON milling tools during high speed milling of Inconel 718,”, Wear, vol. 378, pp. 58-67, 2017.
• M. H. Lewis and P. Barnard, “Oxidation mechanisms in SiAlON ceramics,”, J. Mater. Sci., vol. 15, no. 2, 443-448, 1980.
• M. J. Pomeroy and S. Hampshire, “Oxidation processes in a high substitution β'-sialon,”, Mater. Chem. Phys., vol. 13, no. 5, 437-448, 1985.
• J. Yu, H. Du, R. Shuba and I. W. Chen, “Dopant-dependent oxidation behavior of α-SiAlON ceramics,”, J. Mater. Sci., vol. 39, no. 15, pp. 4855-4860, 2004.
• G. Corapcioglu and S. Kurama, “Oxidation behaviour and kinetics of α-SiAlON ceramics,”, Mater. High Temp., vol. 26, no. 2, pp. 145-151, 2009.
• L. O. Nordberg, M. Nygren, P. O. Käll and Z. Shen, “Stability and oxidation properties of RE‐α‐Sialon ceramics (RE= Y, Nd, Sm, Yb),”, J. Am. Ceram. Soc., vol. 81, no. 6, 1461-1470, 1998.
• M. Zenotchkine, R. Shuba, J. S. Kim and I. W. Chen, “R‐curve behavior of in-situ toughened α‐SiAlON ceramics,”, J. Am. Ceram. Soc., vol. 84, no. 4, 884-886, 2001.
• E. Y. Sun, P. F. Becher, K. P. Plucknett, C. H. Hsueh, K. B. Alexander, S. B. Waters and M. E. Brito, “Microstructural design of silicon nitride with improved fracture toughness: II, effects of yttria and alumina additives,”, J. Am. Ceram. Soc., vol. 81, no. 11, 2831-2840, 1998.
• J. Kim, A. Rosenflanz and I. W. Chen, “Microstructure control of in‐situ‐toughened α‐SiAlON Ceramics,”, J. Am. Ceram. Soc., vol. 83, no. 7, 1819-1821, 2000.
• X. T. Wang, Y. J. Zhang, X. Ling, P. Xiao, L. Lin., Q. Chen, J. Wang, S.W. Jia, W. M. Zhu, X. C. Zhu, F. Y. Ji, “Testing of the oxidation resistance of MgAlON materials with non-isothermal oxidation method,” in Proceedings of International Conference on Materials Science and Engineering Application (ICMSEA), April 21-23, Nanjing, China, 2017.
• X. T. Wang, Y. Zhang, P. Xiao, B. Wang, L. Xu, L. Lin and J. Huang, “Characterization of the oxidation resistance property of SiAlON materials with the standard method of GB/T 32329-2015”, in Proceedings of 6th International Conference on Mechatronics, Materials, Biotechnology and Environment (ICMMBE 2016), August 13-14, Yinchuan, China, 2016.
• W. D. Kingery, H. K. Bowen and D. R. Uhlmann, Introduction to Ceramics, Wiley, New York, 634–643, 1975
• P. F. Becher, S. B. Waters, C. G. Westmoreland and L. Riester, “Compositional effects on the properties of Si‐Al‐RE‐based oxynitride glasses (RE= La, Nd, Gd, Y, or Lu),”, J. Am. Ceram. Soc., vol. 85, no. 4, 897-902, 2002.
• S. Hampshire and M. J. Pomeroy, “Grain boundary glasses in silicon nitride: a review of chemistry, properties and crystallization,”, J. Eur. Ceram. Soc., vol. 32, no. 9, 1925-1932, 2012.