• Babaei, Behzad
• Nilforoushan, Mohamad Reza
• Kazemzadeh, Parya
• Tayebi, Morteza
• Yaghoubi, Mohammad

Abstract

<jats:title>Abstract</jats:title><jats:p>In this study, the synthesis of ZrB<jats:sub>2</jats:sub>/SiC composite was carried out via infiltration of silicon melt into a ZrSiO<jats:sub>4</jats:sub>/B<jats:sub>4</jats:sub>C preform, and the effect of different ratios of ZrSiO<jats:sub>4</jats:sub>/B<jats:sub>4</jats:sub>C and C/ZrSiO<jats:sub>4</jats:sub> was investigated on phase and microstructural properties. For this purpose, stoichiometric ratios of raw materials and 10 wt% phenolic resin were used to induce the porosities in the preform. Then the powder mixture was milled and pressed. To perform pyrolysis reaction, it was placed in a vacuum-controlled atmosphere furnace with argon gas at 650 °C and then the Si infiltration process was performed at 1650 °C for 1 h. The hardness, density, and elastic modulus of the samples were measured. The optimum results were obtained for the composite sample with a ZrSiO<jats:sub>4</jats:sub>/B<jats:sub>4</jats:sub>C ratio of 4, which had a density of 5.28 g cm<jats:sup>−3</jats:sup>, elastic modulus of 423 GPa, and hardness of 33.28 GPa. Moreover, scanning electron microscopy and x-ray diffraction analyses confirmed a uniform distribution of ZrB<jats:sub>2</jats:sub> and SiC phases and the absence of undesirable phases in the sample, respectively.</jats:p>

Topics

• density
• pyrolysis
• scanning electron microscopy
• x-ray diffraction
• melt
• composite
• hardness
• Silicon
• resin