Development of α-Al2O3 Ceramics for Bottom of Sintering Impeller Furnace


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In this work, the processing of α-Al2O3 ceramics is studied in order to attain the microstructure and mechanical and thermal properties suitable for its application as a special refractory material in sintering furnaces. Samples of a commercial powder with addition of 3% polyvinyl alcohol, a binder additive, was compacted by uniaxial cold pressing and sintered in air at 1500 oC. The effects of powder preparation conditions and the consolidation process on density, thermal expansion and conductivity, hardness, flexural strength and microstructure were analyzed. Ceramics with densities of approximately 90% were obtained, with an average hardness of 14.9 ± 0.6 GPa, characteristic strength of 238 MPa and Weibull modulus of 8. The microstructure had grain sizes between 1 and 2 μm. Processing and powder consolidation and sintering parameters resulted in alumina ceramic with suitable properties for its intended purpose.



Edited by:

Fernando dos Santos Ortega




M. Barreto Carneiro et al., "Development of α-Al2O3 Ceramics for Bottom of Sintering Impeller Furnace", Materials Science Forum, Vol. 881, pp. 91-96, 2017

Online since:

November 2016




[1] M. Seema: Effects of Particle Size Distribution on the Properties of Alumina Refractories, Doutorado (Tese). Rio de Janeiro, 2011. Instituto Nacional de Tecnologia (INT). (RJ).

[2] B.J. Briscoe, N. Oskan: Powder Technology Vol. 90 (1997), p.195.

[3] A. Roosen, H.K. Bowen: J. Am. Ceram. Soc. Vol. 71 (1988), p.970.

[4] H.N. Yoshimura, A.L. Molisani, G.R. Siqueira, A.C. Camargo, N.E. Narita, P.F. Cesar, H. Goldenstein: Cerâmica Vol. 51 (2005), p.239.

[5] J.K.M.F. Daguano, F.A. Santos, A.A. Palmeira, C. Santos, O.M.M. Silva: 53° Congresso Brasileiro de Cerâmica (CBC). Guarujá, 07-10 de Junho 2009. Proceeding.. Guarujá 2009. (SP).

[6] J. Ma, L.C. Lim: Journal of the European Ceramic Society Vol. 22 (2002), p.2197.

[7] E.J. Gonzalez, G. White, L. Wei: J. Mater. Res. Vol. 15 (2000), p.744.

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