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The preparation and properties of some lithium zinc silicate glass-ceramics

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Abstract

Lithium zinc silicate glasses are of interest for the preparation of moderately high thermal expansion glass-ceramics which are suitable for sealing to a number of nickel-based superalloys. The effect of composition, in particular the variation of nucleating species, on the crystallization behaviour of a number of these glasses has been examined using differential thermal analysis, X-ray diffraction, and electron microscopy. Various crystal phases have been identified, including cristobalite, quartz, tridymite andγ 0 Li2ZnSiO4. In addition, most of the glass-ceramics also contain an unidentified phase which may be related to theβ-series of lithium zinc silicates. Heat-treatment schedules have been derived on the basis of these results in order to produce a number of glass-ceramic materials. The resultant thermal expansion characteristics of the glass-ceramics have been monitored using dilatometry, and expansions in the range ≈12.3 to 17.1×10−6° C−1 (20 to 460° C), have been obtained, depending on the precise glass composition and heat-treatment schedule employed. In addition, the mechanical properties of a number of selected samples have been monitored, employing a biaxial flexure technique.

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Authors and Affiliations

  1. Atomic Weapons Establishment, Aldermaston, Berkshire, UK

    I. W. Donald & B. L. Metcalfe

  2. School of Materials Science and Physics, Thames Polytechnic, London, UK

    D. J. Wood

  3. School of Chemical Physics, University of Bristol, Bristol, UK

    J. R. Copley

Authors
  1. I. W. Donald
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  2. B. L. Metcalfe
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  3. D. J. Wood
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  4. J. R. Copley
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Donald, I.W., Metcalfe, B.L., Wood, D.J. et al. The preparation and properties of some lithium zinc silicate glass-ceramics. J Mater Sci 24, 3892–3903 (1989). https://doi.org/10.1007/BF01168952

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