Influence of sol-gel derived ZrB2 additions on microstructure and mechanical properties of SiBCN composites |
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| Affiliation: | 1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150080 China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China;3. Department of Materials Engineering, Monash University, Clayton, VIC 3800, Australia;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China;3. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, UK;1. Nanotechnology Department, Space Transportation Research Institute, Tehran, Iran.;2. Materials and Energy Research Center (MERC), P.O. Box 14155-4777, Tehran, Iran;1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Institute of Functional Materials, Donghua University, Shanghai, 201620, China;2. Shanghai Institute of Ceramics Chinese Academy of Sciences, Shanghai, 200050, China;3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China |
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| Abstract: | A simple method for introducing ZrB2 using sol-gel processing into a SiBCN matrix is presented in this paper. Zirconium n-propoxide (ZNP), boric acid and furfuryl alcohol (C5H6O2) (FA) were added as the precursors of zirconia, boron oxide and carbon forming ZrB2 dispersed in a SiBCN matrix. SiBCN/ZrB2 composites with different contents of ZrB2 (5, 10, 15, and 20 wt%) were formed at 2000 °C for 5 min by spark plasma sintering (SPS). The microstructures were carefully studied. TEM analysis showed that the as formed ZrB2 grains were typically 100–500 nm in size and had uniform distribution. HRTEM revealed clean grain boundaries between ZrB2 and SiC, however, a separation of C near the SiC boundary was observed. The flexural strength, fracture toughness, Young's modulus and Vicker's hardness of composites all improved with the ZrB2 contents and SiBCN matrix containing 20 wt% of ZrB2 could reach 351±18 MPa, 4.5±0.2 MPa m1/2, 172±8 GPa and 7.2±0.2 GPa, respectively. The improvement in fracture toughness can be attributed to the tortuous crack paths due to the presence of reinforcing particles. |
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| Keywords: | SiBCN SPS Mechanical properties |
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