Effect of particle size on microstructure and strength of porous spinel ceramics prepared by pore-forming in situ technique

Bulletin of materials science

Nan Li¹  Wen Yan¹  Bingqiang Han¹  Juliang Xu¹  Guangping Liu¹  Yuanyuan Li¹ 

[1] The Key State Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology, Wuhan 430081, China$$The Key State Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology, Wuhan 430081, ChinaThe Key State Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology, Wuhan 430081, China$$

关键词: Porous spinel ceramics;    particle size;    magnesite;    bauxite;    microstructure;    strength.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The porous spinel ceramics were prepared from magnesite and bauxite by the pore-forming in situ technique. The characterization of porous spinel ceramics was determined by X-ray diffractometer (XRD), scanning electron microscopy(SEM), mercury porosimetry measurement etc and the effects of particle size on microstructure and strength were investigated. It was found that particle size affects strongly on the microstructure and strength. With decreasing particle size, the pore size distribution occurs from multi-peak mode to bi-peak mode, and lastly to mono-peak mode; the porosity decreases but strength increases. The most apposite mode is the specimens from the grinded powder with a particle size of 6.53 𝜇m, which has a high apparent porosity (40%), a high compressive strength (75.6MPa), a small average pore size (2.53 𝜇m) and a homogeneous pore size distribution.

【 授权许可】

Unknown