Formation of rod-like Si3N4 grains in porous SRBSN bodies using 6Y2O3–2MgO sintering additives
2009; Elsevier BV; Volume: 35; Issue: 6 Linguagem: Inglês
10.1016/j.ceramint.2009.01.010
ISSN1873-3956
AutoresDo-Van Tuyen, Young‐Jo Park, Hai-Doo Kim, Byong‐Taek Lee,
Tópico(s)MXene and MAX Phase Materials
ResumoThe porous reaction-bonded silicon nitride (RBSN) bodies using (6 wt.% Y2O3–2 wt.% MgO) 6Y2M were fabricated by nitridation process at 1350 °C for 8 h. The porous gas pressure sintered (GPSed)-RBSN bodies post-sintered at 1550–1850 °C for 6 h show a microstructure with low aspect ratios having high porosity. The compressive strength of samples sintered at 1650 °C, 1750 °C and 1850 °C were about 146 MPa, 251 MPa and 285 MPa, respectively. The duration time for sintering had a significant effect on the microstructure and grain morphology of the GPSed-RBSN bodies. Even though the GPSed-RBSN was carried out at the comparatively low temperature (1550 °C) for 9 h, high aspect ratio of rod-like Si3N4 grains with about 9 was observed. The material properties of samples such as porosity, phase ratio (β/(α + β)) and compressive strength of sample sintered at 9 h were about 43.2%, 99% and 141 MPa, respectively.
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