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Investigation of the Mechanical Properties and Machinability of Fluorphlogopite-Gehlenite Glass-Ceramics
B. Eftekhari Yekta1, Z. Hamnabard2
1 Ceramic Division, Department of Materials, Iran University of Science & Technology, Tehran, Iran
2 Ceramic Division, Materials & Energy Research Centre, Tehran, Iran
received July 23, 2013, received in revised form November 10, 2013, accepted November 20, 2013
Vol. 4, No. 4, Pages 193-196 DOI: 10.4416/JCST2013-00019
Abstract
The gradual addition of CaO to a SiO2-Al2O3-B2O3-MgO-K2O-F glass-ceramic composition led to the precipitation of gehlenite crystals and the formation of a potassium-calcium solid solution of fine mica crystals. The above additions almost tripled the bending strength and led to a ∼ 1.5-fold increase in the fracture toughness of the glass-ceramic specimens. When the amount of CaO reached 30 weight parts, the microhardness of glass-ceramic specimens was considerably reduced while their machinability was improved.
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Keywords
Mechanical properties, glasses
References
1 Schneider, S.J.: Engineered materials handbook, vol. 4, ceramics & glasses. ASM International, Materials Park, OH, 873, (1991).
2 Grossman, D.G.: Machinable glass-ceramics based on tetrasilicic mica, J. Am. Ceram. Soc., 55, [9], 446 – 449, (1972).
3 Eftekhari, B., Hasheminia, S., Alizadeh, P.: Influence of TiO2, Cr2O3 and ZrO2 on sintering and machinability of fluorphlogopite glass-ceramics, Brit. Ceram. T., 103, [5], 235 – 237, (2004).
4 Henry, J., Hill, R.G.: The influence of lithia content on the properties of fluorphlogopite glass-ceramics, parts 1 & 2, J. Non-Crys. Solids, 319, [1 – 2], 1 – 30, (2003).
5 Strnad, Z.: Glass-ceramic materials, glass science & technology, Elsevier Science Publishers, New York, 226, (1986).
6 Holand, W., Beall, G.: Glass-Ceramic technology, The Am. Ceram. Soc., Westerville, 236 – 241, (2002).
7 Alizadeh, P., Eftekhari Yekta, B., Javadi, T.: Sintering behavior and mechanical properties of the mica-diopside machinable glass-ceramics, J. Eur. Ceram. Soc., 28, 1569 – 1575, (2008).
8 Montazerian, M., Alizadeh, P., Eftekhari Yekta, B.: Pressureless sintering and mechanical properties of mica glass-ceramic/Y-PSZ composite, J. Eur. Ceram. Soc., 28, 2687 – 2692, (2008).
9 Alizadeh, P., Monatazerian, M., Eftekhari Yekta, B.: Processing and properties of a mica-apatite glass-ceramic reinforced with Y-PSZ particles, J. Eur. Ceram. Soc., 28, 2693 – 2699, (2008).
10 Mallik, A., Basumajumdar, A., Kundu, P., Maiti, P.K.: Some studies on nucleation, crystallization, microstructure and mechanical properties of mica glass-ceramics in the system 0.2BaO·0.8K2O·4MgO·Al2O3·6SiO2·2MgF2, Ceram. Int. 39, [3], 2551 – 2559, (2013).
11 Ghaffari, M., Alizadeh, P., Rahimipour, M.R.: Sintering behavior and mechanical properties of mica-diopside glass-ceramic composites reinforced by nano- and micro-sized zirconia particles, J. Non-Crys. Solids, 358, 23, 3304 – 3311, (2012).
12 Durschang, D.R., Carl, G., Russel, C., Meier Katzschmann, E., Schnapp, J.D.: Structure and properties of anisotropic glass-ceramic produced by extrusion, in Proceedings of the 17th International Glass Conference, Peking, 5, 221, 216 – 225, (1995).
13 Habelitz, S., Carl, G., Russel, C., Thiel, S., Gerth, U., Schnapp, J.D., Jordanov, A., Knake, H.: Mechanical properties of oriented mica glass-ceramic, J. Non-Cryst. Solids, 220, 291 – 298, (1997).
14 Cheng, K., Wan, J., Liang, K.: Enhanced mechanical properties of oriented mica glass-ceramics, Mater. Lett., 39, 350 – 353, (1999).
15 Unuma, H., Miura, K., Kodaira, K.: Improvement of Mechanical Properties of Machinable Glass-Ceramics through Post-Machining Heat Treatment, J. Am. Ceram. Soc., 75, [8], 2300 – 2301, (1992).
16 Eftekhari Yekta, B., Hamnabard, Z.: Sintering and crystallization behavior of machinable fluorphlogopite – gehlenite glass-ceramic, J. Int. Appl. Ceram. Tec., 6, 72 – 79, (2009).
17 Chantikul, P., Antis, G.R., Lawn, B.R., Marshall, D.B.: A critical evaluation of indentation techniques for measuring fracture toughness: II, strength method, J. Am. Ceram. Soc., 64, 539 – 543, (1981).
18 Lawn, B.R., Marshall, D.B.: Hardness, toughness and brittleness: an indentation analysis, J. Am. Ceram. Soc., 62, 347 – 350, (1979).
19 Baik, D.S., No, K.S., Chun, J.S., Yoon, Y.J., Cho, H.Y.: A comparative evaluation method of machinability for mica-based glass-ceramics, J. Mater. Sci., 30, 1801 – 1806, (1995).
20 Hoda, S.N., Beall, G.H.: Alkaline earth mica glass-ceramics, in Advances in Ceramics, Vol. 4, Nucleation and Crystallization in Glasses, edited by J.H. Simmons, D.R. Uhlmann, and G.H. Beall, Am. Ceram. Soc., Columbus, OH, 287 – 300, (1982).
21 Lange, F.F.: The interaction of crack front with second-phase dispersion, Philos. Mag., 22, 983 – 992, (1970).
22 Lange, F.F.: Fracture energy and strength behavior of a sodium borosilicate glass-Al2O3 composite system, J. Am. Ceram. Soc., 54, 614 – 620, (1971).
23 Wiederhorn, S.M.: Brittle fracture and toughening mechanism in ceramics, Annu. Rev. Mater. Sci., 14, 374 – 403, (1984).
24 Unuma, H., Miura, K., Kodaira, K.: Improvement of mechanical properties of machinable glass-ceramics through post-machining heat treatment, J. Am. Ceram. Soc., 75, 2300 – 2301 (1992).
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