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The preparation and properties of a glass-ceramic with an aligned microstructure
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Atkinson, David Ian Heaton (1975) The preparation and properties of a glass-ceramic with an aligned microstructure. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b1747155~S15
Abstract
The work described in this thesis was performed on glass-ceramics in which a random arrangement of crystals is grown as a dispersed phase. The physical properties of this material are isotropic.
The technique of hot extrusion has been used to produce a material with an aligned crystal microstructure in a Li₂O-SiO₂ glass-ceramic.
The extruded material consists of a glass matrix and two crystalline phases; one of these phases is aligned morphologically and crystallographically parallel to the extrusion axis.
The microstructure of this extruded material was analysed statistically in terms of the volume fraction of crystalline phases, the mean crystal- crystal spacing and the distribution function of the number of crystals N(Ɵ), making an angle Ɵ with a reference direction. Control specimens of the same composition heat-treated at the same temperature and for the same time as the extruded samples were also analysed statistically.
The following physical properties were measured on the control and extruded specimens:
(i) the coefficient of thermal expansion
(ii) Young's modulus, rupture strength and microhardness
(iii) Resistivity, dielectric constant and loss tangent.
In the case of the extruded samples these measurements were made in directions parallel and perpendicular to the extrusion axis; the coefficient of thermal expansion, the mechanical properties and the resistivity were found to be anisotropic for these specimens.
| Item Type: | Thesis (PhD) | ||||
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| Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology |
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| Library of Congress Subject Headings (LCSH): | Glass-ceramics -- Microstructure, Glass-ceramics -- Analysis, Glass-ceramics -- Properties, Crystals -- Structure | ||||
| Official Date: | 1975 | ||||
| Dates: |
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| Institution: | University of Warwick | ||||
| Theses Department: | Department of Physics | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | McMillan, P. W. (Peter Warwick) | ||||
| Sponsors: | General Electric Company (Great Britain) ; Science Research Council (Great Britain) | ||||
| Extent: | 176, [14] leaves : illustrations | ||||
| Language: | eng |
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