Aqueous slip casting of MgAl2O4 spinel powder

Bulletin of materials science

Ibram Ganesh¹ 

[1] Centre for Advanced Ceramics, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500 005, India$$Centre for Advanced Ceramics, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500 005, IndiaCentre for Advanced Ceramics, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500 005, India$$

关键词: MgAl2O4 spinel;    phosphate coating;    aluminium dihydrogen phosphate;    orthophosphoric acid;    slip casting;    freeze granulation;    double-stage firing process.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

A stoichiometric MgAl₂O₄ spinel (MAS) powder was synthesized by calcining a compacted mixture of ð›�?-Al₂O₃ and calcined caustic MgO at 1400°C for 1 h and was surface treated against hydrolysis using an ethanol solution of H₃PO₄ and Al(H₂PO₄)₃ after fine grinding. Aqueous suspensions with 41â€�??45 vol.% treated powder were prepared using tetra methyl ammonium hydroxide (TMAH) and an ammonium salt of polyacrylic acid (Duramax D-3005) as dispersing agents. These stable suspensions were consolidated in plaster moulds by slip casting (SC) route for the first time. For comparison purposes, the treated powder was also compacted by die-pressing technique after converting into freeze-dried granules and sintered along with slip cast samples at 1550â€�??1650°C for 1â€�??2 h. The MAS ceramics fabricated by slip casting and die-pressing exhibited comparable properties.

【 授权许可】

Unknown