Effect of initial composition on boron carbide production by SHS process followed by acid leaching

Murat Alkan; M. Seref Sonmez; Bora Derin; Onuralp Yücel

doi:10.1016/j.solidstatesciences.2012.07.004

Effect of initial composition on boron carbide production by SHS process followed by acid leaching

Murat Alkan, M. Seref Sonmez, Bora Derin^*, Onuralp Yücel

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Istanbul Technical University

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

27 Citations (Scopus)

Abstract

In this study, iron-free boron carbide powders (B₄C) were produced from the milled SHS (self-propagating high temperature synthesis) products followed by leaching in an aqueous hydrochloric acid (HCl) media. The SHS mixtures were composed of boron oxide (B₂O₃), carbon black and magnesium. Thermochemical simulations were performed to estimate the effect of initial composition on the SHS process. In the SHS experiments, it was found that the formations of boron carbide and magnesium borates were directly related with B₂O₃ and carbon black contents in the initial SHS mixture. The aqueous HCl leaching of the SHS products did not only eliminate the unwanted byproducts (i.e. MgO, Mg₃B₂O ₆ and Mg₂B₂O₅) but also enhanced substantially the pore structure of the particles. Even though the leached SHS particles (d_0.5 = 7.96 μm) were much coarser than that of the commercial powder (d_0.5 = 1.73 μm), the surface area of the leached product (15.56 m²/g) was found to be larger than that of commercial one (4.92 m²/g).

Original language	English
Pages (from-to)	1688-1691
Number of pages	4
Journal	Solid State Sciences
Volume	14
Issue number	11-12
DOIs	https://doi.org/10.1016/j.solidstatesciences.2012.07.004
Publication status	Published - 2012

Keywords

BC
Leaching
SHS
XRD

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10.1016/j.solidstatesciences.2012.07.004

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title = "Effect of initial composition on boron carbide production by SHS process followed by acid leaching",

abstract = "In this study, iron-free boron carbide powders (B4C) were produced from the milled SHS (self-propagating high temperature synthesis) products followed by leaching in an aqueous hydrochloric acid (HCl) media. The SHS mixtures were composed of boron oxide (B2O3), carbon black and magnesium. Thermochemical simulations were performed to estimate the effect of initial composition on the SHS process. In the SHS experiments, it was found that the formations of boron carbide and magnesium borates were directly related with B2O3 and carbon black contents in the initial SHS mixture. The aqueous HCl leaching of the SHS products did not only eliminate the unwanted byproducts (i.e. MgO, Mg3B2O 6 and Mg2B2O5) but also enhanced substantially the pore structure of the particles. Even though the leached SHS particles (d0.5 = 7.96 μm) were much coarser than that of the commercial powder (d0.5 = 1.73 μm), the surface area of the leached product (15.56 m2/g) was found to be larger than that of commercial one (4.92 m2/g).",

keywords = "BC, Leaching, SHS, XRD",

author = "Murat Alkan and Sonmez, {M. Seref} and Bora Derin and Onuralp Y{\"u}cel",

year = "2012",

doi = "10.1016/j.solidstatesciences.2012.07.004",

language = "English",

volume = "14",

pages = "1688--1691",

journal = "Solid State Sciences",

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T1 - Effect of initial composition on boron carbide production by SHS process followed by acid leaching

AU - Alkan, Murat

AU - Sonmez, M. Seref

AU - Derin, Bora

AU - Yücel, Onuralp

PY - 2012

Y1 - 2012

N2 - In this study, iron-free boron carbide powders (B4C) were produced from the milled SHS (self-propagating high temperature synthesis) products followed by leaching in an aqueous hydrochloric acid (HCl) media. The SHS mixtures were composed of boron oxide (B2O3), carbon black and magnesium. Thermochemical simulations were performed to estimate the effect of initial composition on the SHS process. In the SHS experiments, it was found that the formations of boron carbide and magnesium borates were directly related with B2O3 and carbon black contents in the initial SHS mixture. The aqueous HCl leaching of the SHS products did not only eliminate the unwanted byproducts (i.e. MgO, Mg3B2O 6 and Mg2B2O5) but also enhanced substantially the pore structure of the particles. Even though the leached SHS particles (d0.5 = 7.96 μm) were much coarser than that of the commercial powder (d0.5 = 1.73 μm), the surface area of the leached product (15.56 m2/g) was found to be larger than that of commercial one (4.92 m2/g).

AB - In this study, iron-free boron carbide powders (B4C) were produced from the milled SHS (self-propagating high temperature synthesis) products followed by leaching in an aqueous hydrochloric acid (HCl) media. The SHS mixtures were composed of boron oxide (B2O3), carbon black and magnesium. Thermochemical simulations were performed to estimate the effect of initial composition on the SHS process. In the SHS experiments, it was found that the formations of boron carbide and magnesium borates were directly related with B2O3 and carbon black contents in the initial SHS mixture. The aqueous HCl leaching of the SHS products did not only eliminate the unwanted byproducts (i.e. MgO, Mg3B2O 6 and Mg2B2O5) but also enhanced substantially the pore structure of the particles. Even though the leached SHS particles (d0.5 = 7.96 μm) were much coarser than that of the commercial powder (d0.5 = 1.73 μm), the surface area of the leached product (15.56 m2/g) was found to be larger than that of commercial one (4.92 m2/g).

KW - BC

KW - Leaching

KW - SHS

KW - XRD

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DO - 10.1016/j.solidstatesciences.2012.07.004

M3 - Article

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SN - 1293-2558

VL - 14

SP - 1688

EP - 1691

JO - Solid State Sciences

JF - Solid State Sciences

IS - 11-12

ER -

Effect of initial composition on boron carbide production by SHS process followed by acid leaching

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Keywords

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