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Hardness properties and microscopic investigation of crack–crystal interaction in SiO2–MgO–Al2O3–K2O–B2O3–F glass ceramic system

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Abstract

In view of the potential engineering applications requiring machinability and wear resistance, the present work focuses to evaluate hardness property and to understand the damage behavior of some selected glass–ceramics having different crystal morphologies with SiO2–MgO–Al2O3–K2O–B2O3–F composition, using static micro-indentation tests as well as dynamic scratch tests, respectively. Vickers hardness of up to 5.5 GPa has been measured in glass–ceramics containing plate like mica crystals. Scratch tests at a high load of 50 N in artificial saliva were carried out in order to simulate the crack–microstructure interaction during real-time abrasion wear and machining operation. The experimental observations indicate that the novel “spherulitic-dendritic” shaped crystals, similar to the plate like crystals, have the potential to hinder the scratching induced crack propagation. In particular, such potential of the ‘spherulitic-dendritic’ crystals become more effective due to the larger interfacial area with the glass matrix as well as the dendritic structure of each mica plate, which helps in crack deflection and crack blunting, to a larger extent. While modest damage tolerant behavior is observed in case of ‘spherulitic-dendritic’ crystal containing material, severe brittle fracture of plate like crystals were noted, when both were scratched at 50 N load.

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Notes

  1. FEI QUANTA 200, The Netherlands.

  2. Isodebyeflex 2002, USA.

  3. Carl Zeiss Jena, Germany.

  4. TR 101, Ducom, Bangalore, India.

  5. PC5500, Eutech Instruments, USA.

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  1. Department of Materials and Metallurgical Engineering, Indian Institute of Technology, IIT-Kanpur, Kanpur, India

    Shibayan Roy & Bikramjit Basu

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  1. Shibayan Roy
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  2. Bikramjit Basu
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Roy, S., Basu, B. Hardness properties and microscopic investigation of crack–crystal interaction in SiO2–MgO–Al2O3–K2O–B2O3–F glass ceramic system. J Mater Sci: Mater Med 21, 109–122 (2010). https://doi.org/10.1007/s10856-009-3853-7

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