ESRA DOKUMACI, İLKER ÖZKAN, A Bülent ÖNAY

Gözenekli ZrB2 Peletlerin Farklı Sıcaklıklardaki Oksidasyon Davranışları

Bu çalışmada soğuk preslenmiş gözenekli ZrB2 peletlerinin farklı incelenmiştir. Oksidasyon deneyleri 800?C, 1000?C ve 1200?C sıcaklıklarda 1, 2, 5, 10, 15 ve 20 saat süreler ile yapılmıştır. Deneylerin sonucunda korozyon ürünü olarak ZrO2, ZrB2, B70 ve B2O3 fazlarının oluştuğu tespit edilmiştir. Aynı zamanda peletlerin oksidasyon davranışlarının sıcaklığa ve zamana bağlı olduğu gözlenmiştir. değerlendirildiğinde, oluşan B2O3 fazının farklı sıcaklıklardaki davranışının numunelerin oksidasyon davranışında önemli bir etkisi olduğu sonucuna varılmıştır

Oxidation Behavior of Porous ZrB2 Pellets at Different Temperatures

In this study, cyclic oxidation of cold pressed porous ZrB2 pellets at different temperatures was investigated. Oxidation tests were performed at 800˚C, 1000˚C, and 1200˚C for 1, 2, 5, 10, 15 and 20 hours. As a result of experiments, ZrO2 ZrB2, B70 and B2O3 have been found to occur as corrosion product. At the same time it was observed that oxidation behaviour of pellets depend on temperature and time. When analysis results and microstructures were evaluated, it is concluded that behavior of the B2O3 phases at different temperatures has a significant effect on the oxidation of the samples

PDF

___

[1] Rezaie A, Fahrenholtz WG, Hilmas GE. 2007. Evolution of structure during the oxidation of zirconium diboride–silicon carbide in air up to 1500˚C, Journal of the European Ceramic Society, Cilt. 27, s.2495– 2501. DOI: 10.1016/j.jeurceramsoc.2006.10.0 12
[2] Seong YH, Kim DK. 2014. Oxidation behavior of ZrB2-xSiC composites at 1500˚C under different oxygen partial pressures, Ceramics International, Cilt. 40, s.15303– 15311. DOI: 10.1016/j.ceramint.2014.07.036
[3] Opeka MM, Talmy IG. Zaykoski J.A. 2004. Oxidation-based materials selection for 2000˚C+ hypersonic aerosurfaces: theoretical considerations and historical experience, Journal of Material Science, Cilt. 39, s.5887-5904. DOI: 10.1023/B:JMSC.0000041686.217 88.77
[4] Parthasarathy TA, Rapp RA, Opeka M, Kerans, R.J. 2007. A Model for the Oxidation of ZrB2, HfB2 and TiB2, Acta Materialia, Cilt. 5, s.5799–6010. DOI: 10.1016/j.actamat.2007.07.027
[5] Han J, Hu P, Zhang X, Meng S, Han W. 2008. Oxidation-resistant ZrB2– SiC composites at 2200˚C, Composites Science and Technology, Cilt. 68, s.799–806. DOI: 10.1016/j.compscitech.2007.08.01 7
[6] Fahrenholtz WG. The ZrB2 Volatility Diagram, Journal of American Ceramic Society, Cilt. 88, No. 12, 2005, s.3509–3512. DOI: 10.1111/j.1551- 2916.2005.00599.x
[7] F. Monteverde, A. Bellosi, S. Guicciardi. 2002. Processing and properties of zirconium diboridebased composites”, Journal of the European Ceramic Society Cilt. 22, s.279–288. DOI: 10.1016/S0955- 2219(01)00284-9
[8] Wang Z, Niu Y, Hu C, Li H, Zen Y, Zheng X, Ren, Sun J. 2015. High temperature oxidation resistance of metal silicide incorporated ZrB2 composite coatings prepared by vacuum plasma spray, Ceramics International, Cilt. 41, s.14868– 14875. DOI: 10.1016/j.ceramint.2015.08.015.
[9] Guo WM, Zhang GJ. 2010. Oxidation resistance and strength retention of ZrB2–SiC ceramics, Journal of the European Ceramic Society, Cilt. 30, s.2387–2395. DOI: 10.1016/j.jeurceramsoc.2010.01.0 28
[10] Sarin P, Driemeyer PE, Haggerty RP, Kim DK, Bell JL, Apostolov ZD, Kriven WM. 2010. In situ studies of oxidation of ZrB2 and ZrB2–SiC composites at high temperatures, Journal of the European Ceramic Society, Cilt. 30, s.2375–2386. DOI: 10.1016/j.jeurceramsoc.2010.03.0 09
[11] Talmy IG, Zaykoski JA, Opeka MM. 2008. High-Temperature Chemistry and Oxidation of ZrB2 Ceramics Containing SiC, Si3N4, Ta5Si3, and TaSi2, Journal of American Ceramic Society, Cilt. 91, No. 7, s.2250–2257. DOI: 10.1111/j.1551- 2916.2008.02420.x
[12] Dehdashti MK, Fahrenholtz WG, Hilmas GE. 2014. Effects of temperature and the incorporation of W on the oxidation of ZrB2 ceramics, Corrosion Science, Cilt. 80, s.221–228. DOI: 10.1016/j.corsci.2013.11.030
[13] Dehdashti MK, Fahrenholtz WG, Hilmas GE. 2015. Effects of transition metals on the oxidation behavior of ZrB2 ceramics, Corrosion Science, Cilt. 91, s.224–231. DOI: 10.1016/j.corsci.2014.11.019
[14] Dong ZH, Peng X, Wang FH. 2015. Oxidation of a ZrB2 coating fabricated onTa–W alloy by electrophoretic deposition and laser melting, Materials Letters, Cilt. 148, s.76–78. DOI: 10.1016/j.matlet.2015.02.075
[15] Türkdoğan E.T. 1980. Physical Chemistry of High Temperature Technology, Academic Press, 462s.
[16] Lee DB, Lee YC, Kim DJ. 2001. The Oxidation of TiB2 Ceramics Containing Cr and Fe, Oxidation of Metals, Cilt. 56, No. 1, s.177-189. DOI: 10.1023/A:1010369526960
[17] Irving RJ, Worsley IG. 1968. The Oxidation of Titanium Diboride and Zirconium Diboride at High Temperatures, Journal of Less Common Metals, Cilt. 16, s.103- 112. DOI: 10.1016/0022- 5088(68)90067-2
[18] Kofstad P. 1988. High Temperature Corrosion, Elsevier Applied Science Publishers, England, 558s.