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Crystallization Behavior and Mechanical Properties of In-situ Alumina-Zirconia Composite Bodies

Publish Year: 1397
Type: Journal paper
Language: English
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JR_ACERPT-4-4_005

Index date: 15 October 2019

Crystallization Behavior and Mechanical Properties of In-situ Alumina-Zirconia Composite Bodies abstract

In-situ alumina-zirconia composite bodies were fabricated by heat treatment of gibbsite-zircon-kaolinite mixture at 1450℃. The current research investigated crystallization behavior and mechanical properties of the mentioned mixture in the presence of 5 wt.% MgO as an additive. X-ray diffraction (XRD) results showed that alumina, zirconia, and magnesium aluminosilicate were crystallized during the heat treatment at 1250-1550℃. It was expected that mullite and zirconia were crystallized as the final phases; however, the addition of 5 wt.% of MgO changed the behavior of the mentioned mixture during the heat treatment at 1250-1550℃. Energy diffractive X-Ray spectroscopy (EDS) reported that after heat treatment at 1450℃, an Al3+-rich aluminosilicate phase was formed as the matrix of the composite. Crystallization of alumina and zirconia and the existence of the amorphous aluminosilicate phase formed a composite with appropriate hardness and mechanical strength. The diametral tensile strength and Vickers microhardness values of the final composite were 130±7 MPa and 7.49 ± 1.2 GPa, respectively.

Crystallization Behavior and Mechanical Properties of In-situ Alumina-Zirconia Composite Bodies Keywords:

Crystallization Behavior and Mechanical Properties of In-situ Alumina-Zirconia Composite Bodies authors

Pooneh Barfi Sistani

Department of Materials Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

Sahar Mollazadeh Beidokhti

Department of Materials Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

Alireza Kiani-Rashid

Department of Materials Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

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