Abstract
dc:description.abstractThe corrosion resistance of chemically modified β-eucryptite (Li<sub>0.41</sub>Mg<sub>0.035</sub>AlP<sub>0.52</sub>Si<sub>0.48</sub>0₄) having low expansion anisotropy and a near zero coefficient of thennal expansion was evaluated. Samples were exposed to aqueous hydrochloride acid at temperatures up to 100°C and environments containing sodium sulfate up to l000°C. The corrosion resistance was characterized by dilatometry, scanning electron microscopy, X-ray diffraction, energy dispersive x-ray analysis, weight variations, and mechanical properties variations. The results show that modified β-eucryptite is more severely corroded than commercial lithium-alumina-silicate glass-ceramics when exposed to these environments. Aqueous HCI removes AIP04 from modified β-eucryptite leaving a very porous structure. Molten salt corrodes modified β-eucryptite by penetration of sodium and sulfur which form an alkali melt under the surface. The modulus of rupture and the Young's modulus are reduced by both types of corrosion.
Degree
thesis:*- Name thesis:degree_name
- Master of Science
- Level thesis:degree_level
- masters
- Discipline thesis:degree_discipline
- Materials Engineering
- Department dc:contributor.department
- Materials Engineering
- Grantor dc:publisher
- Virginia Tech
- Year dc:date.issued
- 1991
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Battu, Laurent P.
- Chair dc:contributor.committeechair
-
- Brown, Jesse J. Jr.
- Committee members dc:contributor.committeemember
-
- Gordon, Ronald S.
- Farkas, Diana
Rights
dc:rights- Statement dc:rights
-
- In Copyright
- Licence dc:rights.uri
- Language dc:language.iso
- en
Identifiers
dc:identifier.*- Dc Identifier Other
- etd-08142009-040239
- OAI identifier oai:identifier
- oai:vtechworks.lib.vt.edu:10919/44206