Sintering and oxidation of GdB4 synthesized by B4C reduction method

Jitendra Kumar Sonber; Tammana Shri Ram Chandra Murthy; Kannan Sairam; Vivekanand Kain

doi:10.4191/kcers.2017.54.2.02

Sintering and oxidation of GdB4 synthesized by B₄C reduction method

Jitendra Kumar Sonber^*, Tammana Shri Ram Chandra Murthy, Kannan Sairam, Vivekanand Kain

^*Corresponding author for this work

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

154 Downloads (Pure)

Abstract

Gadolinium tetraboride (GdB4) was synthesized by reduction of Gd2O3 using boron carbide in presence of carbon. Effect of temperature on product quality was investigated. Pure GdB4 powder was obtained in vacuum at 1500oC. Pressureless sintering experiments revealed that sintering takes place only above 1600oC. A maximum density of 77.1% of the theoretical value was obtained at 1800oC by pressureless sintering. Hot pressing resulted in 95.5% of theoretical density at the lower temperature of 1700oC under 35 MPa pressure. Hardness and fracture toughness of dense GdB4 were measured and found to be 21.4 GPa and 2.3 MPa·m1/2, respectively. After exposure to air at 900oC, the formation of a porous and non-protective oxide layer was observed.

Original language	English
Pages (from-to)	121-127
Number of pages	7
Journal	Journal of the Korean Ceramic Society
Volume	54
Issue number	2
DOIs	https://doi.org/10.4191/kcers.2017.54.2.02
Publication status	Published - 1 Mar 2017

Keywords

Boride
GdB
Hot pressing
Oxidation
Synthesis

ASJC Scopus subject areas

Ceramics and Composites

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Jitendra_Kumar_Sonber_et_al_Sintering_and_oxidation_of_GdB4_Journal_of_the Korean_Ceramic_Society_2017
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Cite this

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title = "Sintering and oxidation of GdB4 synthesized by B4C reduction method",

abstract = "Gadolinium tetraboride (GdB4) was synthesized by reduction of Gd2O3 using boron carbide in presence of carbon. Effect of temperature on product quality was investigated. Pure GdB4 powder was obtained in vacuum at 1500oC. Pressureless sintering experiments revealed that sintering takes place only above 1600oC. A maximum density of 77.1% of the theoretical value was obtained at 1800oC by pressureless sintering. Hot pressing resulted in 95.5% of theoretical density at the lower temperature of 1700oC under 35 MPa pressure. Hardness and fracture toughness of dense GdB4 were measured and found to be 21.4 GPa and 2.3 MPa·m1/2, respectively. After exposure to air at 900oC, the formation of a porous and non-protective oxide layer was observed.",

keywords = "Boride, GdB, Hot pressing, Oxidation, Synthesis",

author = "Sonber, {Jitendra Kumar} and Murthy, {Tammana Shri Ram Chandra} and Kannan Sairam and Vivekanand Kain",

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T1 - Sintering and oxidation of GdB4 synthesized by B4C reduction method

AU - Sonber, Jitendra Kumar

AU - Murthy, Tammana Shri Ram Chandra

AU - Sairam, Kannan

AU - Kain, Vivekanand

PY - 2017/3/1

Y1 - 2017/3/1

N2 - Gadolinium tetraboride (GdB4) was synthesized by reduction of Gd2O3 using boron carbide in presence of carbon. Effect of temperature on product quality was investigated. Pure GdB4 powder was obtained in vacuum at 1500oC. Pressureless sintering experiments revealed that sintering takes place only above 1600oC. A maximum density of 77.1% of the theoretical value was obtained at 1800oC by pressureless sintering. Hot pressing resulted in 95.5% of theoretical density at the lower temperature of 1700oC under 35 MPa pressure. Hardness and fracture toughness of dense GdB4 were measured and found to be 21.4 GPa and 2.3 MPa·m1/2, respectively. After exposure to air at 900oC, the formation of a porous and non-protective oxide layer was observed.

AB - Gadolinium tetraboride (GdB4) was synthesized by reduction of Gd2O3 using boron carbide in presence of carbon. Effect of temperature on product quality was investigated. Pure GdB4 powder was obtained in vacuum at 1500oC. Pressureless sintering experiments revealed that sintering takes place only above 1600oC. A maximum density of 77.1% of the theoretical value was obtained at 1800oC by pressureless sintering. Hot pressing resulted in 95.5% of theoretical density at the lower temperature of 1700oC under 35 MPa pressure. Hardness and fracture toughness of dense GdB4 were measured and found to be 21.4 GPa and 2.3 MPa·m1/2, respectively. After exposure to air at 900oC, the formation of a porous and non-protective oxide layer was observed.

KW - Boride

KW - GdB

KW - Hot pressing

KW - Oxidation

KW - Synthesis

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