Determination of mechanical properties and thermal treatment behavior of alumina-based refractories

Katsavou, ID; Krokida, MK; Ziomas, IC

dc.contributor.author	Katsavou, ID	en
dc.contributor.author	Krokida, MK	en
dc.contributor.author	Ziomas, IC	en
dc.date.accessioned	2014-03-01T02:08:36Z
dc.date.available	2014-03-01T02:08:36Z
dc.date.issued	2012	en
dc.identifier.issn	02728842	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29688
dc.subject	Bauxite	en
dc.subject	Chamotte	en
dc.subject	Compressive strength	en
dc.subject	Modeling	en
dc.subject	Quenching test	en
dc.subject.other	Aluminate cement	en
dc.subject.other	Bauxite	en
dc.subject.other	Bonding phase	en
dc.subject.other	Chamotte	en
dc.subject.other	Compressive properties	en
dc.subject.other	Compressive tests	en
dc.subject.other	Elasticity parameters	en
dc.subject.other	Firing temperature	en
dc.subject.other	Grain size	en
dc.subject.other	Maximum stress	en
dc.subject.other	Molding pressure	en
dc.subject.other	Number of cycles	en
dc.subject.other	Phenol-formaldehyde resin	en
dc.subject.other	Physical meanings	en
dc.subject.other	Process condition	en
dc.subject.other	Stress-strain data	en
dc.subject.other	Visco-elastic parameters	en
dc.subject.other	Water quenching	en
dc.subject.other	Alumina	en
dc.subject.other	Compressive strength	en
dc.subject.other	Grain size and shape	en
dc.subject.other	Mechanical properties	en
dc.subject.other	Models	en
dc.subject.other	Molding	en
dc.subject.other	Phenolic resins	en
dc.subject.other	Phenols	en
dc.subject.other	Quenching	en
dc.subject.other	Stresses	en
dc.subject.other	Refractory materials	en
dc.title	Determination of mechanical properties and thermal treatment behavior of alumina-based refractories	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ceramint.2012.04.021	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ceramint.2012.04.021	en
heal.publicationDate	2012	en
heal.abstract	Two different types of alumina-based refractories have been investigated. Chamotte and bauxite were the raw materials, being molded using a system of aluminate cement and water or a phenol-formaldehyde resin, as binder. Different raw material's grain size, water content, molding pressure, and firing temperature were selected for the preparation of the specimens. The mechanical strength of all specimens was determined using compressive tests, where parameters with physical meaning, such as maximum stress, maximum strain, elasticity parameter, and viscoelastic parameter were obtained after modeling the collected stress-strain data. In addition, water quenching test was performed for both samples, in order to present their thermal stability and mechanical wear after certain cycles. Process conditions as well as the raw materials' characteristics were correlated with the compressive properties. More specifically, maximum stress seemed to increase when increasing all parameters except grain size both for bauxite and chamotte samples. The increment of bonding phase, grain size, and molding pressure caused an increment in maximum strain for both types of refractories. However, the higher the firing temperature was the higher the maximum strain of bauxite appeared, while the maximum strain of chamotte samples was decreased. Modulus of elasticity seemed to increase with bonding phase content and firing temperature and decreased with grain size for both types of refractories. For bauxite samples higher molding pressure caused a decrement in elasticity parameter while for chamotte in caused an increment. As far as the quenching tests are concerned chamotte samples seemed to be more tolerant to thermal shock. After data acquisition, the change presented in elasticity parameter (E) was also modeled with the number of cycles. Both bauxite and chamotte samples showed a decrement in maximum stress after thermal treatment, while elasticity parameter seemed to have a more severe decrement for bauxite samples. © 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.	en
heal.journalName	Ceramics International	en
dc.identifier.doi	10.1016/j.ceramint.2012.04.021	en
dc.identifier.volume	38	en
dc.identifier.issue	7	en
dc.identifier.spage	5747	en
dc.identifier.epage	5756	en