Sol-gel synthesis and formation mechanism of ultrahigh temperature ceramic: HfB2

Research output: Contribution to journalArticlepeer-review

Standard

Sol-gel synthesis and formation mechanism of ultrahigh temperature ceramic : HfB2. / Venugopal, Saranya; Boakye, Emmanuel E.; Paul, Anish; Keller, Kristin; Mogilevsky, Pavel; Vaidhyanathan, Bala; Binner, JGP; Katz, Allan; Brown, Peter M.

In: Journal of the American Ceramic Society, Vol. 97, No. 1, 03.01.2014, p. 92-99.

Research output: Contribution to journalArticlepeer-review

Harvard

Venugopal, S, Boakye, EE, Paul, A, Keller, K, Mogilevsky, P, Vaidhyanathan, B, Binner, JGP, Katz, A & Brown, PM 2014, 'Sol-gel synthesis and formation mechanism of ultrahigh temperature ceramic: HfB2', Journal of the American Ceramic Society, vol. 97, no. 1, pp. 92-99. https://doi.org/10.1111/jace.12654

APA

Venugopal, S., Boakye, E. E., Paul, A., Keller, K., Mogilevsky, P., Vaidhyanathan, B., Binner, JGP., Katz, A., & Brown, P. M. (2014). Sol-gel synthesis and formation mechanism of ultrahigh temperature ceramic: HfB2. Journal of the American Ceramic Society, 97(1), 92-99. https://doi.org/10.1111/jace.12654

Vancouver

Venugopal S, Boakye EE, Paul A, Keller K, Mogilevsky P, Vaidhyanathan B et al. Sol-gel synthesis and formation mechanism of ultrahigh temperature ceramic: HfB2. Journal of the American Ceramic Society. 2014 Jan 3;97(1):92-99. https://doi.org/10.1111/jace.12654

Author

Venugopal, Saranya ; Boakye, Emmanuel E. ; Paul, Anish ; Keller, Kristin ; Mogilevsky, Pavel ; Vaidhyanathan, Bala ; Binner, JGP ; Katz, Allan ; Brown, Peter M. / Sol-gel synthesis and formation mechanism of ultrahigh temperature ceramic : HfB2. In: Journal of the American Ceramic Society. 2014 ; Vol. 97, No. 1. pp. 92-99.

Bibtex

@article{f478e3ff903249afb64068f917144a7d,
title = "Sol-gel synthesis and formation mechanism of ultrahigh temperature ceramic: HfB2",
abstract = "Hafnium diboride (HfB2) powder has been synthesized via a sol-gel-based route using phenolic resin, hafnium chloride, and boric acid as the source of carbon, hafnium, and boron, respectively, though a small number of comparative experiments involved amorphous boron as boron source. The effects of heattreatment dwell time and hafnium:carbon (Hf:C) and hafnium: boron (Hf:B) molar ratio on the purity and morphology of the final powder have been studied and the mechanism of HfB2 formation investigated using several techniques. The results showed that while temperatures as low as 1300°C could be used to produce HfB2 particles, the heat treatment needed to last for about 25 h. This in turn resulted in anisotropic particle growth along the c-axis of the HfB2 crystals yielding tube-like structures of about 10 lm long. Equiaxed particles 1-2 μm in size were obtained when the precursor was heat treated at 1600°C for 2 h. The reaction mechanism involved boro/carbothermal reduction and the indications were that the formation of HfB2 at 1300°C is through the intermediate formation of an amorphous B or boron suboxides, although at higher temperatures more than one reaction mechanism may be active.",
author = "Saranya Venugopal and Boakye, {Emmanuel E.} and Anish Paul and Kristin Keller and Pavel Mogilevsky and Bala Vaidhyanathan and JGP Binner and Allan Katz and Brown, {Peter M.}",
year = "2014",
month = jan,
day = "3",
doi = "10.1111/jace.12654",
language = "English",
volume = "97",
pages = "92--99",
journal = "Journal of the American Ceramic Society",
issn = "0002-7820",
publisher = "Wiley",
number = "1",

}

RIS

TY - JOUR

T1 - Sol-gel synthesis and formation mechanism of ultrahigh temperature ceramic

T2 - HfB2

AU - Venugopal, Saranya

AU - Boakye, Emmanuel E.

AU - Paul, Anish

AU - Keller, Kristin

AU - Mogilevsky, Pavel

AU - Vaidhyanathan, Bala

AU - Binner, JGP

AU - Katz, Allan

AU - Brown, Peter M.

PY - 2014/1/3

Y1 - 2014/1/3

N2 - Hafnium diboride (HfB2) powder has been synthesized via a sol-gel-based route using phenolic resin, hafnium chloride, and boric acid as the source of carbon, hafnium, and boron, respectively, though a small number of comparative experiments involved amorphous boron as boron source. The effects of heattreatment dwell time and hafnium:carbon (Hf:C) and hafnium: boron (Hf:B) molar ratio on the purity and morphology of the final powder have been studied and the mechanism of HfB2 formation investigated using several techniques. The results showed that while temperatures as low as 1300°C could be used to produce HfB2 particles, the heat treatment needed to last for about 25 h. This in turn resulted in anisotropic particle growth along the c-axis of the HfB2 crystals yielding tube-like structures of about 10 lm long. Equiaxed particles 1-2 μm in size were obtained when the precursor was heat treated at 1600°C for 2 h. The reaction mechanism involved boro/carbothermal reduction and the indications were that the formation of HfB2 at 1300°C is through the intermediate formation of an amorphous B or boron suboxides, although at higher temperatures more than one reaction mechanism may be active.

AB - Hafnium diboride (HfB2) powder has been synthesized via a sol-gel-based route using phenolic resin, hafnium chloride, and boric acid as the source of carbon, hafnium, and boron, respectively, though a small number of comparative experiments involved amorphous boron as boron source. The effects of heattreatment dwell time and hafnium:carbon (Hf:C) and hafnium: boron (Hf:B) molar ratio on the purity and morphology of the final powder have been studied and the mechanism of HfB2 formation investigated using several techniques. The results showed that while temperatures as low as 1300°C could be used to produce HfB2 particles, the heat treatment needed to last for about 25 h. This in turn resulted in anisotropic particle growth along the c-axis of the HfB2 crystals yielding tube-like structures of about 10 lm long. Equiaxed particles 1-2 μm in size were obtained when the precursor was heat treated at 1600°C for 2 h. The reaction mechanism involved boro/carbothermal reduction and the indications were that the formation of HfB2 at 1300°C is through the intermediate formation of an amorphous B or boron suboxides, although at higher temperatures more than one reaction mechanism may be active.

UR - http://www.scopus.com/inward/record.url?scp=84895064448&partnerID=8YFLogxK

U2 - 10.1111/jace.12654

DO - 10.1111/jace.12654

M3 - Article

AN - SCOPUS:84895064448

VL - 97

SP - 92

EP - 99

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

SN - 0002-7820

IS - 1

ER -