Mechanical,Tribological, and Thermal Properties of Hot‐Pressed ZrB2‐B4C Composite |
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| Authors: | Shirshendu Chakraborty Debashish Debnath Azizur Rahaman Mallick Probal Kumar Das |
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| Affiliation: | Non Oxide Ceramics and Composite Division, CSIR‐CGCRI, Kolkata, West Bengal, India |
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| Abstract: | The effect of addition of submicrometer‐sized B4C (5,10 and 15 wt%) on microstructure, phase composition, hardness, fracture toughness, scratch resistance, wear resistance, and thermal behavior of hot‐pressed ZrB2‐B4C composites is reported. ZrB2‐B4C (10 wt%) composite has VH1 of 20.81 GPa and fracture toughness of 3.93 at 1 kgf, scratch resistance coefficient of 0.40, wear resistance coefficient of 0.01, and ware rate of 0.49 × 10?3 mm3/Nm at 10N. Crack deflection by homogeneously dispersed submicrometer‐sized B4C in ZrB2 matrix can improve the mechanical and tribological properties. Thermal conductivity of ZrB2‐B4C composites varied from 70.13 to 45.30 W/m K between 100°C and 1000°C which is encouraging for making ultra‐high temperature ceramics (UHTC) component. |
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