An investigation into the formation of second-phase crystals in amorphous Pyrex glass

Cristobalite is a silica polymorph that forms in Pyrex under certain conditions. The effects of processing conditions on the cristobalite content are studied to determine means to prevent its formation. Cristobalite causes microfissures in Pyrex and will cause it to fracture under relatively light l...

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Bibliographic Details
Published in:Journal of materials science letters 1991-02, Vol.10 (3), p.149-153
Main Authors: CLARKE, S. G, BLEAY, S. M, SCOTT, V. D
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Exact sciences and technology
Glasses
Structure, analysis, properties
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Summary:Cristobalite is a silica polymorph that forms in Pyrex under certain conditions. The effects of processing conditions on the cristobalite content are studied to determine means to prevent its formation. Cristobalite causes microfissures in Pyrex and will cause it to fracture under relatively light loading. Samples were fabricated from ball-milled pyrex and hot pressed at 1-20 MPa at temperatures from 750-950 deg C for 30 s. Cristobalite increased with temperature and/or pressure to a maximum of 59 vol.% at 950 deg C and 20 MPa; it seems to nucleate at silica-rich regions. Graphs, Photomicrographs, Spectra. 9 ref.--R.A.S.
ISSN:0261-8028
1573-4811
DOI:10.1007/BF02352832