Title

CARBOTHERMAL PRODUCTION OF ZrB2-ZrO2 COMPOSITE POWDER FROM ZrO2-B2O3/B SYSTEM BY HIGH-ENERGY BALL-MILLING AND ANNEALING ASSISTED PROCESS

CARBOTHERMAL PRODUCTION OF ZrB2-ZrO2 COMPOSITE POWDER FROM ZrO2-B2O3/B SYSTEM BY HIGH-ENERGY BALL-MILLING AND ANNEALING ASSISTED PROCESS

Authorship

AGAOGULLARI, DUYGU; BALCI, OZGE; DUMAN, ISMAIL

AGAOGULLARI, DUYGU

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BALCI, OZGE

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DUMAN, ISMAIL

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DOI

10.5151/2594-5327-34582

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Abstract

The purpose of the present study is to produce zirconium diboride-zirconium dioxide composite powder by comparing two different boron sources as boron oxide and elemental boron. The production method is high-energy ball milling and subsequent annealing of powder mixtures containing stoichiometric amounts of zirconium dioxide, boron oxide/boron powders in the presence of graphite as a reductant. Milling is performed in a vibratory ball-mill using hardened steel balls with 18:1 ball-to-powder weight ratio. The milled products are placed in alumina boats and annealed in a tube furnace held in Argon atmosphere. Milled/annealed products are leached for removing the impurities released by the vial (Fe, Ni, and Cr). ZrB2-ZrO2 composite powder is obtained after centrifuging, washing and drying treatments. The effects of milling duration, annealing temperature and annealing duration on the formation and microstructure of composite powder are investigated. The milled and annealed products are characterized by XRD, SEM and DTA analyses.

The purpose of the present study is to produce zirconium diboride-zirconium dioxide composite powder by comparing two different boron sources as boron oxide and elemental boron. The production method is high-energy ball milling and subsequent annealing of powder mixtures containing stoichiometric amounts of zirconium dioxide, boron oxide/boron powders in the presence of graphite as a reductant. Milling is performed in a vibratory ball-mill using hardened steel balls with 18:1 ball-to-powder weight ratio. The milled products are placed in alumina boats and annealed in a tube furnace held in Argon atmosphere. Milled/annealed products are leached for removing the impurities released by the vial (Fe, Ni, and Cr). ZrB2-ZrO2 composite powder is obtained after centrifuging, washing and drying treatments. The effects of milling duration, annealing temperature and annealing duration on the formation and microstructure of composite powder are investigated. The milled and annealed products are characterized by XRD, SEM and DTA analyses.

Keywords

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