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Microstructures and Properties of Porous Liquid-Phase-Sintered SiC Ceramic by Hot Press Sintering

机译：热压烧结多孔液相烧结SiC陶瓷的组织与性能

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摘要

Porous liquid-phase-sintered SiC (L-SiC) ceramics were successfully fabricated by hot press sintering (HP) at 1800 °C in argon, using Al2O3 and Y2O3 as oxide additions. By varying the starting coarse SiC particle size, the relationships between pore microstructures and flexural strength as well as gas permeability of porous L-SiC were examined. All the as-sintered samples possessed homogeneous interconnected pores. The porosity of porous L-SiC decreased from 34.0% to 25.9%, and the peak pore size increased from 1.1 to 3.8 μm as the coarse SiC particle sizes increased. The flexural strengths of porous L-SiC ceramics at room temperature and 1000 °C were as high as 104.3 ± 7.3 MPa and 78.8 ± 5.1 MPa, respectively, though there was a decrease in accordance with their increasing pore sizes and particle sizes. Moreover, their gas permeability increased from 1.4 × 10−14 m2 to 4.6 × 10−14 m2 with the increase of pore size in spite of their decreased porosity.
机译：通过在氩气中以Al2O3和Y2O3作为氧化物添加剂在1800°C的热压烧结（HP）成功地制备了多孔液相烧结SiC（L-SiC）陶瓷。通过改变粗大SiC的起始粒径，研究了多孔L-SiC的孔微观结构与抗弯强度以及气体渗透性之间的关系。所有烧结后的样品均具有均一的互连孔。多孔L-SiC的孔隙率从34.0％降低到25.9％，并且随着SiC粗粒度的增加，峰值孔径从1.1μm增大到3.8μm。多孔L-SiC陶瓷在室温和1000°C下的抗弯强度分别高达104.3±7.3 MPa和78.8±5.1 MPa，尽管随着孔径和粒径的增加而降低。此外，它们的气体渗透率从1.4×10 −14 m 2 增加到4.6×10 −14 m 2 尽管孔隙率降低，但孔径却增加了。

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