High Indentation Resistance of Aluminum Borate Based Glass-Ceramics

Abstract:

Article Preview

This study investigated the bulk crystallization of 54B2O3-19SiO2-17Al2O3-5BaO-5MgO (mol%) glass. Melting was carried out at 1500°C for 1 h using a bottom-load electric furnace. The glass melt was cast into a block and annealed at 500°C for 2 h. Isothermal heat treatment was carried out at 1100°C for 2, 4, 8, 16, 32 h to form bulk crystallized glass-ceramics using a heating and cooling rate of 5°C/min. Phases present in the glass-ceramic samples were studied by x-ray diffraction. Crystalline Al4B2O9 and Al18B4O33 were the main phases and the phase stability depended on the isothermal time. Microstructures were observed by a scanning electron microscope. The size of aluminum borate whiskers/rods tend to increase with longer isothermal holding period. The whisker/ rod-like crystals uniformly oriented throughout the microstructure in all heat treated samples. This led to interlocking microstructure and hence an increase in hardness and fracture toughness. Glass-ceramics synthesized at longer heat treatment times resulted in an increase in the surface hardness and shorter path length at the corner of the diamond pyramid-shaped indenter. Glass-ceramics synthesized in this study can be applied as high temperature resistant machinable materials because their microstructures can resist micro-cracking upon indentation.

Info:

Periodical:

Edited by:

John T.Harry Pearce, Chi-Na Benyajati, Somboon Otarawanna, Sorachon Yoriya, Supaporn Wansom, Thanasat Sooksimuang, Doungporn Sirikittikul, Naruporn Monmaturapoj, Manida Tongroon and Jitti Mungkalasiri

Pages:

3-7

Citation:

P. Sooksaen et al., "High Indentation Resistance of Aluminum Borate Based Glass-Ceramics", Key Engineering Materials, Vol. 545, pp. 3-7, 2013

Online since:

March 2013

Export:

Price:

$41.00

[1] G. Beall, Design of glass-ceramics, Solid State Sci., vol 3, p.333–354, (1989).

[2] N.A. Travitzky, Mechanical properties and microstructure of mullite whisker-reinforced magnesium aluminosilicate glass with cordierite composition. J. Mater. Sci. Lett., 17 (1998) 1609-1611.

[3] P.F. Becher, C.H. Hsueh, P. Angelini and T.N. Tiegs, Toughening behavior in whisker-reinforced ceramic matrix composites. J. Am. Ceram. Soc., 71 (1988) 1050-1061.

DOI: https://doi.org/10.1111/j.1151-2916.1988.tb05791.x

[4] K. Okada and N. Otuska, Synthesis of mullite whiskers and their application in composites. J. Am. Ceram. Soc., 74 (1991) 2412-2418.

[5] J.X. Li, T. Narita, J. Ogawa and M. Wadasako, In situ synthesis of porous ceramics with a framework structure of aluminium borate whisker. J. Mater. Sci., 33 (1998) 2601-2605.

DOI: https://doi.org/10.1023/a:1004309403901

[6] Y. Cheng, H. Xiao, C. Shuguang and B. Tang, Structure and crystallization of B2O3-Al2O3-SiO2 glass. Phys. B 404 (2009) 1230-1234.

DOI: https://doi.org/10.1016/j.physb.2008.11.198

[7] H.K. Lee, S. Zerbetto, P. Colombo and C.G. Pantano, Glass-ceramics and composites containing aluminum borate whiskers. Ceramics International, 36 (2010) 1589-1596.

DOI: https://doi.org/10.1016/j.ceramint.2010.02.039

[8] S.B. Ray, Preparation and characterization of aluminum borate, J. Am. Ceram. Soc., 75 (1992) 2605-2609.

[9] http: /www. goodfellow. com/A/Machinable-Glass-Ceramic. html [Accessed 21-09-2012].