Preparation and characterization of porous MgAl2O4 spinel ceramic supports from bauxite and magnesite

Porous magnesium aluminate spinel (MgAl2O4) ceramic supports were fabricated by reactive sintering from low-cost bauxite and magnesite at different temperatures ranging from 1100 to 1400°C and their sintering behavior and phase evolution were evaluated. The effects of sintering temperature on the po...

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Published inCeramics international Vol. 41; no. 6; pp. 7374 - 7380
Main Authors Wang, Feng, Ye, Jianke, He, Gang, Liu, Guanghua, Xie, Zhipeng, Li, Jiangtao
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.07.2015
Subjects
Aluminum base alloys
Bauxite
Ceramics
Corrosion resistance
Flexural strength
Flux
Magnesite
Modulus of rupture in bending
Porosity
Sintering
Spinel ceramic support
Bauxite
Magnesite
Spinel ceramic support
Sintering
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Summary:Porous magnesium aluminate spinel (MgAl2O4) ceramic supports were fabricated by reactive sintering from low-cost bauxite and magnesite at different temperatures ranging from 1100 to 1400°C and their sintering behavior and phase evolution were evaluated. The effects of sintering temperature on the pore structure, size and distribution as well as on the main properties of spinel ceramic supports such as flexural strength, nitrogen permeation flux and chemical resistance were investigated. The supports prepared at 1300°C showed a homogeneous pore structure with the average pore size of 4.42μm, and exhibited high flexural strength (35.6MPa), high gas permeability (with nitrogen gas flux of 3057m3m−2h−1 under a trans-membrane pressure of 0.1MPa) and excellent chemical resistance.
Bibliography:ObjectType-Article-1
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ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2015.02.044