Microstructural and densification study of natural Indian magnesite in presence of zirconia additive

Bulletin of materials science

P K Maiti²  Saswata Mukherjee¹  P G Pal¹  Kaberi Das¹ 

[1] Government College of Engineering and Ceramic Technology, 73, A. C. Banerjee Lane, Kolkata 700 010, India$$Government College of Engineering and Ceramic Technology, 73, A. C. Banerjee Lane, Kolkata 700 010, IndiaGovernment College of Engineering and Ceramic Technology, 73, A. C. Banerjee Lane, Kolkata 700 010, India$$;Department of Chemical Technology, University of Calcutta, 92, A.P.C. Road, Kolkata 700 009, India$$Department of Chemical Technology, University of Calcutta, 92, A.P.C. Road, Kolkata 700 009, IndiaDepartment of Chemical Technology, University of Calcutta, 92, A.P.C. Road, Kolkata 700 009, India$$

关键词: Magnesite;    zirconia;    sintering;    direct bonded periclase;    magnesio zirconate.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The sintering and microstructural evaluation of Indian magnesite was carried out in presence of zirconia. Zirconia in monoclinic form was added in the range 3â€�??6 wt% with respect to raw magnesite and the sintering temperature selected were 1500â€�??1600°C for 2 h. The main impurities present in the magnesite were Fe₂O₃, CaO, SiO₂. The natural crystalline magnesite could be sintered with bulk density of 3.38 g/cc (A.P. 1.54%) at 1550°C/2 h. But the higher bulk density (3.50 g/cc) and minimum apparent porosity (A.P. 0.25%) was attained at 1550°C/2 h with the 3 wt% zirconia additive. On firing magnesite with zirconia as additive, a crystalline phase, magnesio-zirconate, was identified at the triple point regions of the direct bonded periclase grains. The morphology of the periclase grains were changed from subrounded/rounded to angular shaped in presence of zirconia as additive.

【 授权许可】

Unknown