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Journal of Materials Science

, Volume 28, Issue 4, pp 1007–1014 | Cite as

Sintering and crystallization of a glass powder in the MgO-Al2O3-SiO2-ZrO2 system

  • M. I. Budd
Papers

Abstract

The sintering and crystallization behaviour was studied of a glass powder in the MgO-Al2O3-SiO2-ZrO2 system in which the main crystal phases to form are clino-enstatite (MgSiO3) and cubic zirconia (c-ZrO2). During isothermal, atmospheric sintering of the glass powder, a fine dispersion of c-ZrO2 particles, 50–100 nm diameter, was observed to form, but this did not appear to inhibit the sintering process. Nucleation of the main crystal phase, clino-enstatite, occurred both within the original glass powder particles and at the former particle surfaces, but the rate of crystallization was greater at the former particle surfaces. The c-ZrO2 precipitates are thought to act as nucleation sites for the crystallization of the clino-enstatite. Relative densities of up to 98% were attainable during sintering, and were reached at a stage where a significant degree of crystal phase development had already taken place, proving that completion of sintering prior to the commencement of crystallization is not always a pre-requisite for the attainment of high final densities. In the material studied, the large volume contraction (∼ 11%) on crystallization and the possible release of dissolved gases led to a decrease in relative density as crystallization proceeded. The relative density after complete crystallization was found to be 94%±1%, irrespective of the temperature and duration of the initial sintering stage of heat-treatment, and it appeared that most of the residual porosity was a result of the volume contraction on crystallization rather than poor densification during sintering.

Keywords

Crystallization Relative Density Crystal Phase Glass Powder MgSiO3 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1993

Authors and Affiliations

  • M. I. Budd
    • 1
  1. 1.GEC ALSTHOM Engineering Research CentreStaffordUK

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