Effect of TiSi2 addition on densification of Cerium hexaboride

J. K. Sonber; T. S.R.Ch Murthy; K. Sairam; B. Paul; J. K. Chakravartty

doi:10.1016/j.ceramint.2015.09.015

Effect of TiSi₂ addition on densification of Cerium hexaboride

J. K. Sonber^*, T. S.R.Ch Murthy, K. Sairam, B. Paul, J. K. Chakravartty

^*Corresponding author for this work

Metallurgy and Materials

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

4 Citations (Scopus)

Abstract

This paper reports the result of investigation carried out on the synthesis and densification of Cerium hexaboride. CeB₆ was synthesized by boron carbide reduction of CeO₂ in presence of carbon. Effect of temperature on product quality was investigated. Pure CeB₆ powder was obtained at 1600 °C, in vacuum. It was found that CeBO₃ is formed as an intermediate phase during CeB₆ synthesis. Spark plasma sintering of CeB₆ powder at 1900 °C and 70 MPa resulted in a density of only 93.4% of theoretical value. Addition of 5% TiSi₂ resulted in 97.4% of theoretical density at the lower temperature of 1650 °C. Hardness and fracture toughness of the composite was measured as 21.08 GPa and 3.8 MPa·m^1/2 respectively. Fractured surface of the composite reveals the mode of fracture to be transgranular. SEM and EDS analysis indicate the presence of TiSi₂ in CeB₆ matrix.

Original language	English
Pages (from-to)	891-896
Number of pages	6
Journal	Ceramics International
Volume	42
Issue number	1
Early online date	10 Sept 2015
DOIs	https://doi.org/10.1016/j.ceramint.2015.09.015
Publication status	Published - 1 Jan 2016

Keywords

CeB
Rare earth
Spark plasma sintering
Synthesis

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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Cite this

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title = "Effect of TiSi2 addition on densification of Cerium hexaboride",

abstract = "This paper reports the result of investigation carried out on the synthesis and densification of Cerium hexaboride. CeB6 was synthesized by boron carbide reduction of CeO2 in presence of carbon. Effect of temperature on product quality was investigated. Pure CeB6 powder was obtained at 1600 °C, in vacuum. It was found that CeBO3 is formed as an intermediate phase during CeB6 synthesis. Spark plasma sintering of CeB6 powder at 1900 °C and 70 MPa resulted in a density of only 93.4% of theoretical value. Addition of 5% TiSi2 resulted in 97.4% of theoretical density at the lower temperature of 1650 °C. Hardness and fracture toughness of the composite was measured as 21.08 GPa and 3.8 MPa·m1/2 respectively. Fractured surface of the composite reveals the mode of fracture to be transgranular. SEM and EDS analysis indicate the presence of TiSi2 in CeB6 matrix.",

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T1 - Effect of TiSi2 addition on densification of Cerium hexaboride

AU - Sonber, J. K.

AU - Murthy, T. S.R.Ch

AU - Sairam, K.

AU - Paul, B.

AU - Chakravartty, J. K.

PY - 2016/1/1

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N2 - This paper reports the result of investigation carried out on the synthesis and densification of Cerium hexaboride. CeB6 was synthesized by boron carbide reduction of CeO2 in presence of carbon. Effect of temperature on product quality was investigated. Pure CeB6 powder was obtained at 1600 °C, in vacuum. It was found that CeBO3 is formed as an intermediate phase during CeB6 synthesis. Spark plasma sintering of CeB6 powder at 1900 °C and 70 MPa resulted in a density of only 93.4% of theoretical value. Addition of 5% TiSi2 resulted in 97.4% of theoretical density at the lower temperature of 1650 °C. Hardness and fracture toughness of the composite was measured as 21.08 GPa and 3.8 MPa·m1/2 respectively. Fractured surface of the composite reveals the mode of fracture to be transgranular. SEM and EDS analysis indicate the presence of TiSi2 in CeB6 matrix.

AB - This paper reports the result of investigation carried out on the synthesis and densification of Cerium hexaboride. CeB6 was synthesized by boron carbide reduction of CeO2 in presence of carbon. Effect of temperature on product quality was investigated. Pure CeB6 powder was obtained at 1600 °C, in vacuum. It was found that CeBO3 is formed as an intermediate phase during CeB6 synthesis. Spark plasma sintering of CeB6 powder at 1900 °C and 70 MPa resulted in a density of only 93.4% of theoretical value. Addition of 5% TiSi2 resulted in 97.4% of theoretical density at the lower temperature of 1650 °C. Hardness and fracture toughness of the composite was measured as 21.08 GPa and 3.8 MPa·m1/2 respectively. Fractured surface of the composite reveals the mode of fracture to be transgranular. SEM and EDS analysis indicate the presence of TiSi2 in CeB6 matrix.

KW - CeB

KW - Rare earth

KW - Spark plasma sintering

KW - Synthesis

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