PRODUCTION OF NANO B4C–ZrB2 COMPOSITE POWDERS VIA SELFPROPAGATINGHIGH-TEMPERATURE SYNTHESIS (SHS) AND EFFECTSOF FUNCTIONAL ADDITIVES ON THE SHS OF MONOLITHIC ZrB2
Yazarlar (4)
Doç. Dr. Mehmet BUĞDAYCI Yalova Üniversitesi, Türkiye
Doç. Dr. Ahmet Turan Yalova Üniversitesi, Türkiye
Kağan Benzeşik
İstanbul Teknik Üniversitesi, Türkiye
İstanbul Teknik Üniversitesi, Türkiye
Prof. Dr. Onuralp Yücel İstanbul Teknik Üniversitesi, Türkiye
| Makale Türü | Özgün Makale (Diğer hakemli uluslarası dergilerde yayınlanan tam makale) | ||
| Dergi Adı | Nanostudies | ||
| Makale Dili | İngilizce | Basım Tarihi | 12-2016 |
| Cilt / Sayı / Sayfa | 1 / 13 / 191–204 | DOI | – |
| UAK Araştırma Alanları |
Metalik Malzemeler
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| Özet |
| There are many production methods for the synthesis of boride and carbide based advanced nano ceramics such as carbothermic reduction, synthesis from elements, gas phase reactions and self-propagating high-temperature synthesis (SHS). SHS is one of the important methods to synthesize advanced materials such as abrasives, cutting tools and polishing powders, resistive heating elements, shape-memory alloys, high-temperature structural alloys, master alloys, neutron attenuators as well as conventional metals and their alloys. In the present study, before the experiments, advanced thermochemical simulations of the processes were investigated in detail by using FactSage 6.2 thermochemical simulation software. In addition, the adiabatic temperatures were calculated for each system. In the first experimental set, the production parameters of B4C–ZrB2 composite powders were investigated for various proportions of B4C–ZrB2 composite ratios via SHS. The optimum SHS conditions were determined as ZrO: Mg: B2O3= 1: 3: 6 molar ratio for ZrB2 and C: B2O3: Mg= 1.6: 2: 6 for B4C predicted, respectively. In the second experimental set, effects of functional additives (KCl4 and NaCl) were investigated to improve reduction efficiency and surface area of monolithical SHS synthesis of ZrB2. In the experimental set in question, functional additive addition ratios were 2.5 and 5 wt.%(in comparison to the charge) for each additive type. XRD patterns showed that the main phases of the SHS products were MgO containing phases and ZrB2. After the SHS stage, ZrB2 was separated from byproducts (MgO, Mg3B2O6 and Mg2B2O5) by HCl acid … |
| Anahtar Kelimeler |
