Use this URL to cite or link to this record in EThOS: | https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.659155 |
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Title: | Development of a novel oxide-oxide ceramic matrix composite for high temperature structural applications | ||||||
Author: | Dearn, Sophie Clare |
ISNI:
0000 0004 5358 9306
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Awarding Body: | University of Birmingham | ||||||
Current Institution: | University of Birmingham | ||||||
Date of Award: | 2015 | ||||||
Availability of Full Text: |
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Abstract: | |||||||
The introduction of ceramic matrix composites (CMCs) for structural applications in the hot section of a gas turbine provides many potential benefits over conventional alloy materials, including facilitating elevated operating temperatures. The development of an oxide-oxide CMC composed of commercially available Nextel 720 (3M) fibres within a porous alumina matrix was presented. A simple, low cost processing method involving slurry impregnation and subsequent consolidation and densification was developed, facilitating the production of dried pre-impregnated fabric (‘pre-preg’) that can be stored in ambient conditions. Detailed investigation into the effect of three types of PVA binder, the effect of 0-20wt% additions of an alumina precursor (ACH), the influence of a bimodal particle distribution and the effect of sintering at temperatures between 1100 and 1300°C on processing and mechanical properties was completed in order to optimise the material. The optimised composite material, composed of Nextel 720 fibres within a submicron alumina particle matrix with 10wt% ACH sintered at 1200°C, exhibited mean flexural strength >205MPa, short beam shear strength >12MPa and tensile strength >146MPa. These results were comparable to similar oxide CMCs previously reported, validating this material.
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Supervisor: | Not available | Sponsor: | Engineering and Physical Sciences Research Council ; Rolls Royce plc. | ||||
Qualification Name: | Thesis (Ph.D.) | Qualification Level: | Doctoral | ||||
EThOS ID: | uk.bl.ethos.659155 | DOI: | Not available | ||||
Keywords: | TA Engineering (General). Civil engineering (General) ; TN Mining engineering. Metallurgy | ||||||
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