Physical Properties of SiCp/Sialon Composites with 4% Y2O3
来源期刊：JOURNAL OF RARE EARTHS2004年增刊第3期
论文作者：SUN Xudong QIU Guanming Zhang Ning Gong Ganlei Ru Hongqiang Wang Lei
Key words：ceramic matrix composites; SiCp/Sialon; second-phase; mechanical properties; densification;
Abstract: SiCp/Sialon ceramic manix composites were fabricated by pressureless sintering method using the Sialon powder synthesized from the kaolin clay and submicron SiC particles. The best sintering parameter of SiCp/Sialon composites with 4% (mass fraction) Y2O3 is 1500 ℃×2 h. It is shown that with the increasing of SiCp content, the bulk density decreases, the apparent porosity increases, the flexure strength increases at first and then decreases, the fracture toughness increases and hardness gradually decreases. The best physical properties can be obtained with 10 mass% SiCp, and the bulk density is 3.06 g ·cm-3, apparent porosity is 2.4％, flexure strength is 389.5 MPa, and Vickers hardness is 18.4 GPa. There will be 1280 MPa radial tensile stress and 640 MPa tangential stress in side of Sialon of interphase boundary between SiCp and Sialon phase by calcilation. The mechanism of improvement of SiC content on mechanical properties are also discussed.
SUN Xudong1，QIU Guanming1，Zhang Ning2，Gong Ganlei1，Ru Hongqiang1，Wang Lei1
(1.School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;
2.Institute of Mechanical engineering, Shenyang University,Shenyang 110044, China)
Abstract:SiCp/Sialon ceramic manix composites were fabricated by pressureless sintering method using the Sialon powder synthesized from the kaolin clay and submicron SiC particles. The best sintering parameter of SiCp/Sialon composites with 4% (mass fraction) Y2O3 is 1500 ℃×2 h. It is shown that with the increasing of SiCp content, the bulk density decreases, the apparent porosity increases, the flexure strength increases at first and then decreases, the fracture toughness increases and hardness gradually decreases. The best physical properties can be obtained with 10 mass% SiCp, and the bulk density is 3.06 g ·cm-3, apparent porosity is 2.4％, flexure strength is 389.5 MPa, and Vickers hardness is 18.4 GPa. There will be 1280 MPa radial tensile stress and 640 MPa tangential stress in side of Sialon of interphase boundary between SiCp and Sialon phase by calcilation. The mechanism of improvement of SiC content on mechanical properties are also discussed.
Key words:ceramic matrix composites; SiCp/Sialon; second-phase; mechanical properties; densification;
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