25 Ekim 2018 Konferans bildirisi Açık Erişim

Avcıoğlu, Suna; Kaya, Figen; Kaya, Cengiz

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    <subfield code="a">&lt;p&gt;In the present study, highly crystalline boron carbide (B&lt;sub&gt;4&lt;/sub&gt;C) powders without excess carbon were fabricated by using a modified sol-gel method. Condensed boric acid (H&lt;sub&gt;3&lt;/sub&gt;BO&lt;sub&gt;3&lt;/sub&gt;)-glycerin-tartaric acid products were prepared using different synthesis times ranging from 30 min. to 3h. The condensed gels were calcined at atmospheric conditions followed by a heat treatment at 1500&amp;deg;C for 5 h. in the Ar atmosphere. The effects of starting composition and processing conditions on the phase composition, particle size, size distribution, and morphology of boron carbide powders were investigated. The results showed that (B-O-C) bonds were formed with condensation reaction which confirms the cross-linking of glycerin and boric acid. B&lt;sub&gt;4&lt;/sub&gt;C particles with varied morphologies (rod, plate, polyhedral equiaxed, and cubic) have a wide-ranged particle size distribution in between 100nm to 30&amp;micro;m. Tartaric acid addition as a gel modifier leads to faster gelation and promotes the formation of road and plate-like B&lt;sub&gt;4&lt;/sub&gt;C particles. Furthermore, B&lt;sub&gt;4&lt;/sub&gt;C powders without free carbon was achieved by optimization of processing conditions and starting composition.&lt;/p&gt;</subfield>
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    <subfield code="g">IMMC 2018</subfield>
    <subfield code="a">19th International Metallurgy &amp; Materials Congress</subfield>
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    <subfield code="a">Synthesis of High Purity Boron Carbide Powders via Sol-Gel Method</subfield>
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    <subfield code="a">The authors are grateful for the financial support from the The Scientific and Technological Research Council of Turkey (TUBITAK) and Yildiz Technical University under the contract numbers of 216M140, 216M145 and FDK-2017-3138, respectively. Prof. Dr. Mehmet Ali Gülgün, Dr. Gülcan Çorapçıoğlu and Nursel Karakaya are acknowledged for their help for TEM, SEM and XRD studies.</subfield>
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