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Year 2012, Volume: 25 Issue: 1, 189 - 197, 24.01.2012

Abstract

Effect of Nano-Crystalline Boehmite Addition on Sintering and Properties of Alumina Ceramics

Year 2012, Volume: 25 Issue: 1, 189 - 197, 24.01.2012

Abstract

In this study, alumina ceramics containing up to 10 wt% of boehmite were sintered at 1550, 1600 and 1650ºC for 1 hour. Water absorption, weight loss, porosity and density values were measured after sintering. Boehmite content caused flocculation during mixing in water suspension. Formation of boehmite agglomerates was clearly seen in SEM examination and also it was observed that there were different shrinkages in alumina matrix and in boehmite agglomerates and this caused gaps around agglomerates. Boehmite addition decreased mechanical properties due to the inhomogeneous dispersion of boehmite in alumina mixtures. Large boehmite agglomerates is sintered and shrank differently compared to alumina matrix. These differences caused large grains (agglomerates) of alumina derived from boehmite and also some large crack around these agglomerates. These structural changes resulted in low densities and low flexural strength as the content of boehmite powder increased in the alumina ceramics. This two phased structure in alumina ceramics resulted in large decreases in flexural strength after sintering at 1650ºC as 210 and 140 MPa for pure alumina and for 10 wt% boehmite added alumina respectively.

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Details

Primary Language English
Subjects Engineering
Journal Section Mechanical Engineering
Authors

Esin Gunay

Yusuf Ozturk This is me

Meryem Sarıguzel This is me

Publication Date January 24, 2012
Published in Issue Year 2012 Volume: 25 Issue: 1

Cite

APA Gunay, E., Ozturk, Y., & Sarıguzel, M. (2012). Effect of Nano-Crystalline Boehmite Addition on Sintering and Properties of Alumina Ceramics. Gazi University Journal of Science, 25(1), 189-197.
AMA Gunay E, Ozturk Y, Sarıguzel M. Effect of Nano-Crystalline Boehmite Addition on Sintering and Properties of Alumina Ceramics. Gazi University Journal of Science. January 2012;25(1):189-197.
Chicago Gunay, Esin, Yusuf Ozturk, and Meryem Sarıguzel. “Effect of Nano-Crystalline Boehmite Addition on Sintering and Properties of Alumina Ceramics”. Gazi University Journal of Science 25, no. 1 (January 2012): 189-97.
EndNote Gunay E, Ozturk Y, Sarıguzel M (January 1, 2012) Effect of Nano-Crystalline Boehmite Addition on Sintering and Properties of Alumina Ceramics. Gazi University Journal of Science 25 1 189–197.
IEEE E. Gunay, Y. Ozturk, and M. Sarıguzel, “Effect of Nano-Crystalline Boehmite Addition on Sintering and Properties of Alumina Ceramics”, Gazi University Journal of Science, vol. 25, no. 1, pp. 189–197, 2012.
ISNAD Gunay, Esin et al. “Effect of Nano-Crystalline Boehmite Addition on Sintering and Properties of Alumina Ceramics”. Gazi University Journal of Science 25/1 (January 2012), 189-197.
JAMA Gunay E, Ozturk Y, Sarıguzel M. Effect of Nano-Crystalline Boehmite Addition on Sintering and Properties of Alumina Ceramics. Gazi University Journal of Science. 2012;25:189–197.
MLA Gunay, Esin et al. “Effect of Nano-Crystalline Boehmite Addition on Sintering and Properties of Alumina Ceramics”. Gazi University Journal of Science, vol. 25, no. 1, 2012, pp. 189-97.
Vancouver Gunay E, Ozturk Y, Sarıguzel M. Effect of Nano-Crystalline Boehmite Addition on Sintering and Properties of Alumina Ceramics. Gazi University Journal of Science. 2012;25(1):189-97.