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http://dx.doi.org/10.4191/kcers.2017.54.2.02

Sintering and Oxidation of GdB4 Synthesized by B4C Reduction Method  

Sonber, Jitendra Kumar (Materials Processing and Corrosion Engineering Division, Bhabha Atomic Research Centre)
Murthy, Tammana Shri Ram Chandra (Materials Processing and Corrosion Engineering Division, Bhabha Atomic Research Centre)
Sairam, Kannan (Materials Processing and Corrosion Engineering Division, Bhabha Atomic Research Centre)
Kain, Vivekanand (Materials Processing and Corrosion Engineering Division, Bhabha Atomic Research Centre)
Publication Information
Journal of the Korean Ceramic Society / v.54, no.2, 2017 , pp. 121-127 More about this Journal
Abstract
Gadolinium tetraboride ($GdB_4$) was synthesized by reduction of $Gd_2O_3$ using boron carbide in presence of carbon. Effect of temperature on product quality was investigated. Pure $GdB_4$ powder was obtained in vacuum at $1500^{\circ}C$. Pressureless sintering experiments revealed that sintering takes place only above $1600^{\circ}C$. A maximum density of 77.1% of the theoretical value was obtained at $1800^{\circ}C$ by pressureless sintering. Hot pressing resulted in 95.5% of theoretical density at the lower temperature of $1700^{\circ}C$ under 35 MPa pressure. Hardness and fracture toughness of dense $GdB_4$ were measured and found to be 21.4 GPa and $2.3MPa{\cdot}m^{1/2}$, respectively. After exposure to air at $900^{\circ}C$, the formation of a porous and non-protective oxide layer was observed.
Keywords
$GdB_4$; Synthesis; Hot pressing; Boride; Oxidation;
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