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- W3019210523 abstract "Zirconium diboride-mullite composite powder was synthesized in-situ by combustion in argon of a zircon sand/B 2 O 3 /Al reactant system in a 3 : 3: 10 M ratio. Zircon sand with a particle size less than 45 μm was activated by high-energy milling for 360 min. The optimum reactant system included the addition of 0.01 mol of Si. The product of the synthesis of this system contained 34 wt% ZrB 2 and 50 wt% mullite. The obtained zirconium diboride-mullite powder was consolidated by hot pressing at 25 MPa in an argon environment, ramping at 10 °C/min to 1,450, 1550 and 1650 °C and holding for 60 min. The sintered composite hot-pressed at 1650 °C had a density of 3.39 g/cm 3 , flexural strength of 153.25 ± 1.19 MPa, hardness of 10.66 GPa and fracture toughness of 4.23 MPa.m 1/2 . The flexural strength and hardness of the composite was significantly influenced by the grain size of the reinforced ZrB 2 . The predominantly intergranular fracture observed in surface micrographs confirmed the high toughness of the composite. The coefficient of thermal expansion of the product hot-pressed at 1650 °C was 6.53 × 10 −6 /°C: much lower than reported coefficients of existing Al 2 O 3 , ZrO 2 ZrB 2 , and ZrB 2 –SiC refractory ceramics." @default.
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- W3019210523 date "2020-08-01" @default.
- W3019210523 modified "2023-09-29" @default.
- W3019210523 title "Zirconium diboride-mullite composite form mineral: Combustion synthesis, consolidation, characterizations and properties" @default.
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- W3019210523 doi "https://doi.org/10.1016/j.ceramint.2020.04.203" @default.
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