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ZrB₂ is a ultra-high temperature ceramic (UHTC's) with a high melting point of over 3040 ° C with unique properties. Of the major problems with ZrB₂ is its weakness of sinterability, that in this study adding SiC in micron and nano as a secondary phase and B₄C as an additive tried to overcome this problem. Systematic studies were performed on the pressureless sintering of ZrB₂–SiC nanocomposites. At first changes in particle size were investigated as a result of different milling times and optimization of this time. Then the effect of different weights of SiC micron and nano with addition of B₄C was investigated. Samples were pressurelessly sintered at 2050 ° C, 2100 ° C, 2150 ° C and 2200 ° C for one hour. ZrB₂–SiC nanocomposites with 10%wt nano SiC and 3%wt B₄C have an average hardness of 14.85± 0.5 GPa and toughness around 3.8 MPam^1/2. At the final stage, the samples were oxidized at 1500 ºC in the air atmosphere and appearance and weight variations were investigated. The results showed that the addition of B₄C is not only useful for sintering but also useful for oxidation resistance.

Keywords: nanocomposites- pressureless sintering - ZrB2 - B4C - mechanical properties

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