Fabrication of porous Si 3 N 4 ceramics through a novel gelcasting method
2014; Elsevier BV; Volume: 133; Linguagem: Inglês
10.1016/j.matlet.2014.06.182
ISSN1873-4979
AutoresTao Wan, Dongxu Yao, Hailong Hu, Yongfeng Xia, Kaihui Zuo, Yu‐Ping Zeng,
Tópico(s)Advanced materials and composites
ResumoPorous Si3N4 ceramics were fabricated through a gelcasting method followed by pressureless sintering at 1680 °C. Water-soluble copolymer of isobuthylene and maleic anhydrade (Isobam) was used as both dispersant and gelling agent, the Si3N4 slurry with 0.2 wt% Isobam was favorable to form a fine homogeneous green body. As the solid loading increased from 25 to 40 vol%, porous Si3N4 ceramics with high porosity of 50–56% and high flexural strength of 167–119 MPa were obtained. This was attributed to fine β-Si3N4 grains and some large elongated grains with interlocking microstructure.
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