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Effect of Microstructural Scale on Thermal Shock Resistance of Aluminum-Reinforced Alumina

Schön, Stefan ; Prielipp, Helge ; Janssen, Rolf ; Rödel, Jürgen ; Claussen, Nils (1994)
Effect of Microstructural Scale on Thermal Shock Resistance of Aluminum-Reinforced Alumina.
In: Journal of the American Ceramic Society, 77 (3)
doi: 10.1111/j.1151-2916.1994.tb05352.x
Article, Bibliographie

Abstract

Thermal shock data are presented for two types of Al/Al2O3 composites (35 vol% Al) with different microstructural scale and compared to a monolithic alumina. The fine-scale Al/A12O3 material exhibits high room-temperature strength (765 MPa) and a gradual decrease in retained strength with increasing quenching temperature difference, δT, and improved thermal shock resistance—as compared to monolithic alumina—even at δT= 600°C. The coarse-scale Al/Al2O3 composite shows high long-crack fracture toughness (10.5 MPa·m1/2) and almost no strength degradation up to δT= 500°C. A qualitative picture for the effect of microstructural scale on thermal shock resistance emerges by employing a simple fracture mechanics description contrasting the crack driving force for transient stress fields with R-curve behavior.

Item Type: Article
Erschienen: 1994
Creators: Schön, Stefan ; Prielipp, Helge ; Janssen, Rolf ; Rödel, Jürgen ; Claussen, Nils
Type of entry: Bibliographie
Title: Effect of Microstructural Scale on Thermal Shock Resistance of Aluminum-Reinforced Alumina
Language: English
Date: March 1994
Journal or Publication Title: Journal of the American Ceramic Society
Volume of the journal: 77
Issue Number: 3
DOI: 10.1111/j.1151-2916.1994.tb05352.x
Abstract:

Thermal shock data are presented for two types of Al/Al2O3 composites (35 vol% Al) with different microstructural scale and compared to a monolithic alumina. The fine-scale Al/A12O3 material exhibits high room-temperature strength (765 MPa) and a gradual decrease in retained strength with increasing quenching temperature difference, δT, and improved thermal shock resistance—as compared to monolithic alumina—even at δT= 600°C. The coarse-scale Al/Al2O3 composite shows high long-crack fracture toughness (10.5 MPa·m1/2) and almost no strength degradation up to δT= 500°C. A qualitative picture for the effect of microstructural scale on thermal shock resistance emerges by employing a simple fracture mechanics description contrasting the crack driving force for transient stress fields with R-curve behavior.

Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 15 Jun 2012 08:49
Last Modified: 05 Mar 2013 10:01
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