The effect of nano-alumina addition on the properties of high-alumina low-cement self-flowing refractory castables

Subject Areas : journal of New Materials

سید حسین Badiee ¹ (دانشیار، گروه مهندسی مواد، واحد شاهرود، دانشگاه آزاد اسلامی، واحد شاهرود، شاهرود، ایران)
باران Jamshidi ² (فارغ التحصیل کارشناسی ارشد، گروه مهندسی مواد،واحد شاهرود، دانشگاه آزاد اسلامی، واحد شاهرود، شاهرود، ایران)
صاحبعلی Manafi ³ (معاون پژوهش و فناوری دانشگاه آزاد اسلامی واحد شاهرود)

Received: 2016-02-20 Accepted : 2018-01-29 Published : 2017-11-22

Keywords: Castable refractory, Hibonite, Low-cement, Nano-alumina, Self-flow,

Abstract :

In this study, the effect of nano-alumina addition on the properties of high-alumina low-cement self-flowing refractory castables was studied. For this reason, the reactive alumina in the refractory castable composition was substituted by nano-alumina powder. Then, the self-flow characteristics such as; self-flow value and working time of high-alumina low-cement refractory castables were studied. Besides, the physical and mechanical properties, phase composition and microstructure of these refractory castables were studied after drying at 110 °C and firing at 1250 and 1450 °C. The results showed that the nano-alumina addition has a great effect on the self-flow characteristics and mechanical strength of these refractory castables. With addition of nano-alumina particles, the self-flow value and working time tends to decrease due to high surface area of nano-alumina particles. By use of 1 wt.% nano-alumina content in the castable composition, the alumina self-flowing castable with adequate working time can be obtained according to standard values of self-flowing castables. The decrease in porosity and, increase in mechanical strengths after drying is obtained by adding nano-alumina. The phase analysis and microstructure evaluations showed that CA₆ phase can be form at lower temperatures (1250 °C) with the addition of nano-alumina. CA₆ platy formation leads to increase of porosity in the microstructure. But, the because of bonding behavior of platy CA₆, the mechanical strengths are considerably increased after firing.

References:

1- T.M. Souza, A.P. Luz, M.A.M. Brito and V.C. Pandolfelli, “In situ elastic modulus evaluation of Al2O3–MgO refractory castables”, Ceramics International, Vol. 40, pp. 1699-1707, 2014.

2- C. Gogtas, H.F. Lopez and K. Sobolev, “Role of cement content on the properties of self-flowing Al2O3 refractory castables”, Journal of the European Ceramic Society, Vol. 34, pp. 1365-1373, 2014, .

3- P.C. Evangelista, C.Parr and C.Revais, “Control of formulation and optimization of self-flow castables based on pure calcium aluminates”, Refractories Applications and News, Vol. 7, pp. 14-18, 2002.

4- B.Myrhe and A.Hundred, “On the influence of super fines in high alumina castables”, XXXIXth International Colloquium refractories, Eurogress, pp.184-188, 1996.

5- R.G. Pileggi, A.R.F. Pardo and V.C. Pandolfelli, “CN Refractories”, special refractories, Vol. 6, 38, 2002.

6- A.P. Luz, M.M. Miglioli, T.M. Souza, S. Hashimoto, S. Zhang and V.C. Pandolfelli, “Effect of Al4SiC4 on the Al2O3.SiC.SiO2.C refractory castables performance, Ceramics International, Vol. 38, pp. 3791-3800, 2012.

7- J.E. Funk and D.R. Dinger, “Particle Size Control for High-Solids Castable Refractories”, Am. Ceram. Soc. Bulletin, Vol. 73, pp. 66-69, 1994.

8- D.Y. Miyaji, T. Tonnesen and J.A. Rodrigues, “Fracture energy and thermal shock damage resistance of refractory castables containing eutectic aggregates”, Ceramics International, Vol. 40, pp. 15227-15239, 2014.

9- J. M. Auvray, C. Gault and M. Huger, “Microstructural changes and evolutions of elastic properties versus temperature of alumina and alumina-magnesia refractory castables”, Journal of the European Ceramic Society, Vol. 28, pp. 1953-1960, 2008.

10- T.M. Souza, M.A.L. Braulio, A.P. Luz, P. Bonadia, V.C. Pandolfelli, Ceramics International, 38, 2012, 3969.

11- E. Prestes, J. Medeiros, D.T. Gomes, J.L.B.C. Veiga and V.C. Pandolfelli, “Hot-erosion of nano-bonded refractory castables for petrochemical industries”, Ceramics International, Vol. 39, pp. 2611-2617, 2013.

[12] V. Kumar, V.K. Singh, A. Srivastava and P.H. Kumar, “Auto-combustion processed high alumina cement and its implementation as bauxite based low cement castables”,Ceramics International, Vol. 40, pp. 16767-16777, 2014.

[13] E.Y. Sako, M.A.L. Braulio and V.C. Pandolfelli, “The corrosion and microstructure relationship for cement-bonded spinel refractory castables”, Ceramics International, Vol. 38, pp. 2177-2185, 2012.

[14]S. Maitra and S. Das, “Effect of TiO2 on the properties of ultralow-cement alumina-spinel castables”, Refractories and Industrial Ceramics, Vol. 47, pp. 63-67, 2006. 

[15] A.G. Tomba Martinez, A.P. Luz, M.A.L. Braulio and V.C. Pandolfelli, “Creep behavior modeling of silica fume containing Al2O3–MgO refractory castables”, Ceramics International, Vol. 38, pp. 327-332, 2012.

[16] S. Mukhopadhyay and P.K. Das Po, “Effect of preformed and in situ spinels on microstructure and properties of a low cement refractory castable”, Ceramics International, Vol. 30, pp. 369-380, 2004.

[17] P. Gehre, C.G. Aneziris, D. Veres, C. Parr, H. Fryda and M. Neuroth, “Improved spinel-containing refractory castables for slagging gasifiers”, Journal of the European Ceramic Society, Vol. 33, pp. 1077-1086, 2013.

[18] S. Otroj, M. R. Nilforushan, A. Daghighi and R. Marzban, “Impact of Dispersants on the Mechanical Strength Development of Alumina-Spinel Self-flowing Refractory Castables”, Ceramics – Silikáty, Vol. 54, pp. 284-289, 2010.

[19] L.A. Dı´az and R. Torrecillas, “Hot bending strength and creep behaviour at 1000–1400 C of high alumina refractory castables with spinel, periclase and dolomite additions”, Journal of the European Ceramic Society, Vol. 29, pp. 53-58, 2009.

[20] A.P. Silva, A.M. Segadães, D.G. Pinto, L.A. Oliveira and T.C. Devezas, “Effect of particle size distribution and calcium aluminate cement on the rheological behaviour of all-alumina refractory castables”, Powder Technology, Vol. 226, pp. 107-113, 2012.

[21] T.M. Souza, A.P. Luz and V.C. Pandolfelli, “Magnesium fluoride role on alumina–magnesia cement-bonded castables”, Ceramics International, Vol. 40, pp. 14947-14956, 2014.

[22] L.A. Dı´az, R. Torrecillas, A.H. de Aza and P. Pena, “Effect of spinel content on slag attack resistance of high alumina refractory castables”, Journal of the European Ceramic Society, Vol. 27, pp. 4623-4631, 2007.

[23] N.M. Rendtorff, N.E. Hipedinger, A.N. Scian and E.F. Aglietti, “Zirconia Reinforcement of Cement Free Alumina Refractory Castables by Two Routes”, Procedia Materials Science,  Vol. 1, pp. 403-409, 2012.

[24] D.G. Pinto, A.P. Silva, A.M. Segadães and T.C. Devezas, “Thermomechanical evaluation of self-flowing refractory castables with and without the addition of aluminate cement”, Ceramics International, Vol. 38, pp. 3483-3488, 2012.

[25] S. Otroj, R. Marzban, Z.A. Nemati, N. Sajadi and M.R. Nilforushan, “Behaviour of Alumina-Spinel Self-flowing Castables with Nano-Alumina Particles Addition”, Ceramics – Silikáty, Vol. 53, pp. 98-101, 2009.

[26] S. H. Badiee, S. Otroj, “Non-cement refractory castables containing nano-silica: Performance, microstructure, properties”, Ceramics - Silikáty, Vol. 53, pp. 297-302, 2009.

[27] S. H. Badiee and S. Otroj, The Effect of Nano-Titania Addition on the Properties of High-Alumina Low-cement Self-flowing Refractory Castables, Ceramics - Silikáty, Vol. 55, pp. 319-325, 2011.

[28] س.ح . بدیعی،س.اطرج، "بررسی تاثیر نانوذرات منیزیا بر خواص دیرگدازهای ریختنی کم سیمان آلومینا بالای خودجاری"، مجله تحقیقات موا دنانو کامپوزیتی، دوره 2، شماره 6، ص 97-104، زمستان 1389.

[29] M. Nouri-Khezrabad, M.A.L. Braulio, V.C. Pandolfelli, F. Golestani-Fard and H.R. Rezaie, “Nano-bonded refractory castables”, Ceramics International, Vol. 39, pp. 3479-3497, 2013, .

[30] M. Nouri-Khezrabad, A.P. Luz, F. Golestani-Fard, H.R. Rezaie and V.C. Pandolfelli, “Citric acid role and its migration effects in nano-bonded refractory castables”, Ceramics International, Vol. 40, pp. 14523-14527, 2014.

[31] ا.رحیمی،ا. منشی، ر.ا.عمادی،  "بررسی اثر اندازه دانه کاربید سیلیسیم در تولید جرم ریختنی نسوز خیلی کم سیمان برای صنایع فولاد،" مجله علمی پژوهشی مواد نوین، دوره1، شماره 2، ص 21-28،زمستان 1389.

[32] س.بیگلر، ح. سرپولکی، ع.نعمتی ، ع. سوری، "بررسی ریزساختار و ویژگی‌های جرم‌های ریختنی دیرگداز اسپینل درجا حاوی افزودنی ZrSiO₄،" مجله علمی پژوهشی مواد نوین، دوره2، شماره 2، ص 97-108،زمستان 1390.