Use this URL to cite or link to this record in EThOS:
Title: Microstructure and properties of transparent glass-ceramics
Author: Stryjak, Andrew J.
ISNI:       0000 0001 3488 5474
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1977
Availability of Full Text:
Access from EThOS:
Access from Institution:
The overall aim of the research programme was to produce a transparent glass-ceramic suitable for high temperature lamp applications, and to correlate microstructural parameters with physical properties. The experimental study included a detailed analysis of the microstructure of a transparent glass-ceramic comprising tetragonal zirconia and zinc aluminate (gahnite) crystals in a high glassy phase. Thermal expansion coefficients were measured for a selection of glass-ceramics and found to be compatible with the expansion coefficients of certain metals used as current leads in lamp construction. Density, microhardness and mechanical strength measurements were determined and correlated with the particle size, volume fraction and mean free path of the crystalline species. The degree of transparency was investigated by optical transmission techniques in the visible and near infra-red ranges. An investigation into the chemical compatibility in selected lamp vapours and at high temperatures was undertaken with good stability occurring for bromine, and sodium iodide and scandium iodide lamps. Electron spin resonance was used to investigate colour centre formation due to sodium vapour exposure, and was also shown to be an invaluable tool in monitoring the crystallization process.
Supervisor: Not available Sponsor: Science Research Council ; Thorn Lighting Ltd
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics ; TP Chemical technology