Influences of metallic Co and mechanical alloying on the microstructural and mechanical properties of TiB 2 ceramics prepared via pressureless sintering

Duygu Aĝaoĝullari; Hasan Gökçe; Ismail Duman; M. Lütfi Öveçoĝlu

doi:10.1016/j.jeurceramsoc.2011.10.033

Influences of metallic Co and mechanical alloying on the microstructural and mechanical properties of TiB ₂ ceramics prepared via pressureless sintering

Duygu Aĝaoĝullari^*, Hasan Gökçe, Ismail Duman, M. Lütfi Öveçoĝlu

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Istanbul Technical University

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

39 Citations (Scopus)

Abstract

This study reports the influences of metallic cobalt (Co) and mechanical alloying (MA) on the microstructural and mechanical properties of TiB ₂ ceramics prepared by using a combined method of cold pressing and sintering. The effects of Co addition (0, 5, 10 and 20wt.%) and mechanical alloying duration (0, 3, 6 and 9h) on the properties of TiB ₂ ceramics were investigated. MA experiments were carried out in a Spex™ 8000D Mixer/Mill and milled powders were subsequently compacted to cylindrical preforms by uniaxial pressing at 400MPa. The green compacts were sintered in a controlled atmosphere at 1550°C for 1h. Phase and microstructural characterizations of the mechanically alloyed (MA'd) and sintered samples were performed by X-ray diffractometer (XRD), optical microscope (OM) and scanning electron microscope (SEM). Density measurements were conducted using Archimedes method. Vickers hardness, elastic modulus and fracture toughness of the sintered samples were measured using Indentation technique.

Original language	English
Pages (from-to)	1949-1956
Number of pages	8
Journal	Journal of the European Ceramic Society
Volume	32
Issue number	9
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2011.10.033
Publication status	Published - Jul 2012

Funding

We would like to express our appreciations to Prof. Dr. Hüseyin Çimenoğlu for his help in elastic modulus and fracture toughness measurements. Further, we would like to express our gratitude to State Planning Organization (DPT) for funding the projects entitled “Advanced Technologies in Engineering” with the project number 2001K120750 and “Development of Al–Cu Based Metal Matrix Composites via Powder Metallurgy Techniques” with the project number 90189 out of which the main infrastructure of the Particulate Materials Laboratories was founded.

Funders	Funder number
Al–Cu Based Metal Matrix Composites via Powder Metallurgy Techniques	90189
DPT	2001K120750
Devlet Planlama Örgütü

Keywords

Cobalt
Milling
Pressing
Sintering
Titanium diboride

Access to Document

10.1016/j.jeurceramsoc.2011.10.033

Cite this

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title = "Influences of metallic Co and mechanical alloying on the microstructural and mechanical properties of TiB 2 ceramics prepared via pressureless sintering",

abstract = "This study reports the influences of metallic cobalt (Co) and mechanical alloying (MA) on the microstructural and mechanical properties of TiB 2 ceramics prepared by using a combined method of cold pressing and sintering. The effects of Co addition (0, 5, 10 and 20wt.%) and mechanical alloying duration (0, 3, 6 and 9h) on the properties of TiB 2 ceramics were investigated. MA experiments were carried out in a Spex{\texttrademark} 8000D Mixer/Mill and milled powders were subsequently compacted to cylindrical preforms by uniaxial pressing at 400MPa. The green compacts were sintered in a controlled atmosphere at 1550°C for 1h. Phase and microstructural characterizations of the mechanically alloyed (MA'd) and sintered samples were performed by X-ray diffractometer (XRD), optical microscope (OM) and scanning electron microscope (SEM). Density measurements were conducted using Archimedes method. Vickers hardness, elastic modulus and fracture toughness of the sintered samples were measured using Indentation technique.",

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AU - Duman, Ismail

AU - Öveçoĝlu, M. Lütfi

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AB - This study reports the influences of metallic cobalt (Co) and mechanical alloying (MA) on the microstructural and mechanical properties of TiB 2 ceramics prepared by using a combined method of cold pressing and sintering. The effects of Co addition (0, 5, 10 and 20wt.%) and mechanical alloying duration (0, 3, 6 and 9h) on the properties of TiB 2 ceramics were investigated. MA experiments were carried out in a Spex™ 8000D Mixer/Mill and milled powders were subsequently compacted to cylindrical preforms by uniaxial pressing at 400MPa. The green compacts were sintered in a controlled atmosphere at 1550°C for 1h. Phase and microstructural characterizations of the mechanically alloyed (MA'd) and sintered samples were performed by X-ray diffractometer (XRD), optical microscope (OM) and scanning electron microscope (SEM). Density measurements were conducted using Archimedes method. Vickers hardness, elastic modulus and fracture toughness of the sintered samples were measured using Indentation technique.

KW - Cobalt

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KW - Pressing

KW - Sintering

KW - Titanium diboride

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