Synthesis of HfB2 Powders by Carbothermal Reduction

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SHIRVANI M.; MASHHADI M.; YOSOFI M.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL) Year:2020 | Volume:38 | Issue:4 Page(s): 75-85

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Title

Synthesis of HfB2 Powders by Carbothermal Reduction

Author(s)

SHIRVANI M. | MASHHADI M. | YOSOFI M. | Issue Writer Certificate

Keywords

Heat treatmentQ2

HfB2Q1

Powder synthesizeQ1

Boric acidQ2

Phenolic resinQ2

Abstract

In this research, solid state carbothermal synthesis of HfB2 Nano powders was investigated. For this purpose, HfO2, H3BO3, carbon active or Phenolic resin were used as raw materials for carbothermal reaction. After 2-4 hours of milling the raw materials by a planetary ball in an ethanol media, the mixture was heat dried and pressed in to disks under pressure of 20-30 bar. The disks were then placed in a graphite crucible and heat-treated at 1500– 1600 ° C for 1 hour under flowing Ar atmosphere. The powder product was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and backscattered electron (BSE) imaging. The Heat treatment temperature, amount of Boric acid, milling and Heat treatment time were recognized as four factors influencing synthesis and size of HfB2 powder particles. SEM images reported irregular morphologies with a particle size of about 2-4 µ m for HfB2 powder. The best sample was obtained at a molar ratio of HfO2: Phenolic resin carbon: Boric acid = 1: 5: 5 at 1600 ° C after 1 hour of Heat treatment. XRD results confirmed synthesis of pure HfB2 with a crystallite size of about 60 nm.

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APA: Copy

SHIRVANI, M., MASHHADI, M., & YOSOFI, M.. (2020). Synthesis of HfB2 Powders by Carbothermal Reduction. ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL), 38(4 ), 75-85. SID. https://sid.ir/paper/163170/en

Vancouver: Copy

SHIRVANI M., MASHHADI M., YOSOFI M.. Synthesis of HfB2 Powders by Carbothermal Reduction. ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL)[Internet]. 2020;38(4 ):75-85. Available from: https://sid.ir/paper/163170/en

IEEE: Copy

M. SHIRVANI, M. MASHHADI, and M. YOSOFI, “Synthesis of HfB2 Powders by Carbothermal Reduction,” ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL), vol. 38, no. 4 , pp. 75–85, 2020, [Online]. Available: https://sid.ir/paper/163170/en

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