Open AccessInfluence of Y2O3 particle size on the microstructure and corrosion behaviour of porous Si3N4 ceramics
Author(s) -
Zheng Xu,
Hai Wang,
X. Zhang,
Y. X.,
W. L.
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1765/1/012006
Subject(s) - microstructure , materials science , sintering , porosity , ceramic , particle size , silicon nitride , corrosion , flexural strength , particle (ecology) , grain size , shrinkage , grain boundary , composite material , metallurgy , mineralogy , silicon , chemical engineering , chemistry , oceanography , engineering , geology
In this study, porous silicon nitride ceramics were fabricated by pressureless with different particle size of Y 2 O 3 using as sintering additive. The effects of particle size of Y 2 O 3 particles on sintering behaviour, microstructure and corrosion behaviour of the β-Si 3 N 4 ceramics were studied in detail. As the Y 2 O 3 particles size decreasing from 5 μm to 0.5 μm, the linear shrinkage of porous β-Si 3 N 4 ceramics increased from 14.3% to 18.3%, and the sintering porosity decreased from 25.3% to 17.6%. The smaller Y 2 O 3 particles additions were consisted of finer β-Si 3 N 4 grains and demonstrated more accordant microstructure due to the well-dispersed Y 2 O 3 . The finer microstructure resulted in the improvement of mechanical properties, the sintered sample with 0.5 μm Y 2 O 3 addition shown flexural strength of 450 MPa. Significant weight loss was observed after corrosion in 1 M HCl solution at 70°C for different time, due to the assumed formation of the grain boundary phase added to the Y 2 O 3 .