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Effect of a LZSA glass-ceramic addition on the sintering behavior of alumina

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Abstract

This work evaluated the effect of a LZSA (Li2O·ZrO2·SiO2·Al2O3) glass-ceramic on the sintering behavior of alumina obtained via liquid-phase sintering. An experimental plan based on three different contents (7, 15 and 21 vol%) of a particulated (d 50 = 1.52 µm) 11.6Li2O·16.8ZrO2·68.2SiO2·3.4Al2O3 glass-ceramic and three different particulate aluminas (d 50 = 0.5, 1.7 and 2.8 µm) was defined. Each formulated composition (composite) was wet-mixed, dried and formed by uniaxial pressing (128 MPa). The sintering behavior and microstructural characteristics were studied and observed by optical dilatometry and scanning electron microscopy, respectively. The results showed that the LZSA glass-ceramic increased the densification of the studied aluminas, resulting in a reduction of 25–100 °C in the sintering initiation temperature. The higher the LZSA content was, the lower the maximum linear shrinkage, the higher the maximum LS rate and the higher the relative density, regardless of the alumina used. These effects were more pronounced for coarse alumina (Ac). The composite Ac21 achieved a relative density of 95 % in the samples sintered at 1600 °C/40 min compared to 85 % for the samples sintered at 1600 °C/4 h. Thus, the LZSA glass-ceramic is a potential candidate for improving the densification of alumina in applications where wear resistance is the main requirement.

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Acknowledgements

The authors are very grateful to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq/Brazil) and Financiadora de Estudos e Projetos (FINEP/Brazil) for funding this study.

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Authors and Affiliations

  1. Grupo de Pesquisa em Cerâmica Técnica – CERTEC, Programa de Pós-Graduação em Ciência e Engenharia de Materiais – PPGCEM, Universidade do Extremo Sul Catarinense – UNESC, Av. Universitária, 1105, P.O. Box 3167, Criciúma, SC, 88.806-000, Brazil

    O. R. K. Montedo, P. C. Milak, F. D. Minatto, C. A. Faller & A. De Noni Jr.

  2. Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPG-CEM, Universidade Federal de São Carlos – UFSCar, Rodovia Washington Luís, km 235, São Carlos, SP, 13565-905, Brazil

    R. B. Nuernberg

  3. Glass-Ceramic Laboratory – VITROCER, Graduate Program in Materials Science and Engineering – PGMAT, Federal University of Santa Catarina – UFSC, Campus Trindade, Florianópolis, SC, 88040-900, Brazil

    A. P. N. Oliveira

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  1. O. R. K. Montedo
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Correspondence to O. R. K. Montedo.

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Montedo, O.R.K., Milak, P.C., Minatto, F.D. et al. Effect of a LZSA glass-ceramic addition on the sintering behavior of alumina. J Therm Anal Calorim 124, 241–249 (2016). https://doi.org/10.1007/s10973-015-5144-5

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