High temperature erosion behavior of spark plasma sintered ZrB2-SiC composites |
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Affiliation: | 1. Biomaterials and Multiscale Mechanics Lab, Indian Institute of Technology Roorkee, Roorkee 247667, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India;3. Centre for Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247667, India;4. Molecular Endocrinology Lab, Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee 247667, India;1. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovak Republic;2. Faculty of Metallurgy, Technical University of Košice, Letná 9, 040 01 Košice, Slovak Republic;3. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava 45, Slovak Republic |
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Abstract: | Damage of structural components of hypersonic vehicles by atmospheric particles demands thorough understanding on their wear behavior. In the present work, dense ZrB2-SiC (10, 20, and 30 vol%) composites are prepared by spark plasma sintering at 55 MPa in two stages: 1400 °C for 6 min followed by 1600 °C for 2 min. With increase in SiC content, microstructures of sintered composites reveal strongly bonded ZrB2 grains with SiC particles. A combination of maximum hardness of 23 GPa, elastic modulus of 398 GPa and fracture toughness of 5.4 MPa m1/2 are obtained for the composite containing 30 vol% SiC particles. It is found that cracks are bridged or deflected by SiC particles in the composites. When the composites are subjected to SiC particle erosion at 800 °C, a 14% decrease in erosion rate is obtained with increase in SiC content from 10 to 30 vol%. The formation of large extent of boro-silicate rich viscous surface on eroded surfaces is attributed to reduced fracture or removal of ZrB2 grains of the composites with increased SiC content. |
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Keywords: | Zirconium diboride Silicon carbide Composites Erosion wear Wear mechanisms |
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