Microstructures and Mechanical Properties of Ti3SiC2/Al2O3 and Ti3SiC2-TiC/Al2O3 Composite Ceramics by Modifying Al2O3 Content Via in-situ Synthesized

Ti3SiC2/Al2O3 and Ti3SiC2-TiC/Al2O3 composite ceramics with various Al2O3 fractions were prepared by Ti, Si, Al, TiC and Al2O3 powers via in-situ reaction. Al2O3 contents in raw materials could influence the reaction process of Ti3SiC2 generated. It would lead to react completely when the Al2O3 volume percentage between 50% to 70%, otherwise TiC as an impurity would be found. Finally the Ti3SiC2/Al2O3 composites with 54.4 wt% Ti3SiC2, and Ti3SiC2-TiC/Al2O3 composites with 54.7 wt% Ti3SiC2 and 9.2 wt% TiC were fabricated successfully. There were two types of TiC existed in composites, called intragranular and intergranular particles. The Ti3SiC2-TiC/Al2O3 composite ceramics with 9.2 wt% TiC showed the higher mechanical properties than Ti3SiC2/Al2O3 composite. From the analyzing of microcrack propagation paths, the dispersed TiC particles as reinforcement agents would cause significant crack deflection, improving the flexural strength and fracture toughness up to 492 MPa and 7.8 MPa.m1/2 respectively.

[1]  Q. Yan,et al.  Microstructure and strengthening mechanism of grain boundary strengthened W-ZrB2 alloy , 2020 .

[2]  Chao Liu,et al.  Microstructure and mechanical properties of SPS sintered Al2O3–ZrO2 (3Y)–SiC ceramic composites , 2020 .

[3]  J. Ding,et al.  Effect of doping SiC particles on cracks and pores of Al2O3–ZrO2 eutectic ceramics fabricated by directed laser deposition , 2019, Journal of Materials Science.

[4]  H. Baharvandi,et al.  Low temperature synthesis of high-purity Ti3SiC2 via additional Si through spark plasma sintering , 2019, Journal of Alloys and Compounds.

[5]  J. Wu,et al.  Microstructure and mechanical properties of hot pressed Ti3SiC2/Al2O3 , 2019, Ceramics International.

[6]  C. Meng,et al.  Investigation of formation mechanism of Ti3SiC2 by high pressure and high-temperature synthesis , 2018, High Pressure Research.

[7]  Jia Kou,et al.  Improved mechanical properties of Al2O3 ceramic by in-suit generated Ti3SiC2 and TiC via hot pressing sintering , 2017 .

[8]  Yanchun Zhou,et al.  Nb doping in Ti3AlC2: Effects on phase stability, high-temperature compressive properties, and oxidation resistance , 2017 .

[9]  F. Luo,et al.  Mechanical, Dielectric, and Microwave-Absorption Properties of Alumina Ceramic Containing Dispersed Ti3SiC2 , 2015, Journal of Electronic Materials.

[10]  Y. Sakka,et al.  Pressureless Sintering and Reaction Mechanisms of Ti3SiC2 Ceramics , 2014 .

[11]  Hongfeng Yin,et al.  Microstructures and mechanical properties of Ti3SiC2/TiC–Al2O3 composites synthesized by reactive hot pressing , 2013 .

[12]  Yanchun Zhou,et al.  Corrosion behavior of selected Mn+1AXn phases in hot concentrated HCl solution: Effect of A element and MX layer , 2012 .

[13]  C. Yeh,et al.  Formation of Ti3SiC2–Al2O3 in situ composites by SHS involving thermite reactions , 2009 .

[14]  Zhengming Sun,et al.  Effect of Al addition on low-temperature synthesis of Ti3SiC2 powder , 2008 .

[15]  Hu Zhang,et al.  Synthesis of AlN nanowires by nitridation of Ti 3 Si 0.9 Al 0.1 C 2 solid solution , 2007 .

[16]  Hu Zhang,et al.  Intermediate phases in synthesis of Ti3SiC2 and Ti3Si(Al)C2 solid solutions from elemental powders , 2006 .

[17]  Hu Zhang,et al.  Improving the oxidation resistance of Ti3SiC2 by forming a Ti3Si0.9Al0.1C2 solid solution , 2004 .

[18]  Zhengming Sun,et al.  Ti3SiC2 powder synthesis from Ti/Si/TiC powder mixtures , 2003 .

[19]  R. Watanabe,et al.  Fabrication of highly dense Ti3SiC2 ceramics by pressureless sintering of mechanically alloyed elemental powders , 2003 .

[20]  Y. Miyamoto,et al.  Ti3SiC2/Al2O3 composites prepared by SPS , 2003 .

[21]  Yanchun Zhou,et al.  Temperature fluctuation/hot pressing synthesis of Ti3SiC2 , 2000 .

[22]  R. Watanabe,et al.  Synthesis of Ti3SiC2 polycrystals by hot-isostatic pressing of the elemental powders , 1999 .

[23]  M. Barsoum,et al.  Synthesis and Characterization of a Remarkable Ceramic: Ti3SiC2 , 1996 .