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NANO PARÇACIK Al2O3/B4C SERAMİK FAZININ MEKANOKİMYASAL YÖNTEMLE SENTEZLENMESİ VE MİKROYAPISAL KARAKTERİZASYONU

MICROSTRUCTURAL CHARACTERIZATION AND SYNTHESIS BY MECHANOCHEMICAL METHOD OF NANO PARTICLE Al2O3/B4C CERAMIC PHASE

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Abstract (2. Language): 
In this study, producabilityof Al2O3/B4C ceramic phases at room temperaturecontrary high temperatureproduction methods (carbothermal reduction, sol gel, chemical vapor deposition etc. ) using the ternary system of B2O3-Al-C was investigated as mechanochemical. The starting materials were activated in attritor, planetary and spex ball mill under argon atmosphere at different times. The characterization of ceramic phase powder mixtures synthesized was investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) XRD studies showed that Al2O3/B4C ceramic phases were formed by using spex after 10h of milling. The agglomeration phenomenon with decrease (50-200 nm) in the powder size were determined as a result of mechanical energy and increase in amount ofceramic phaseformed.TEM studies showed that the products after the leaching process were yielded the efficient distributionofthe ceramic phases with the removal of contaminations.
Abstract (Original Language): 
Bu çalışmada B2O3-Al-C üçlü sistemi kullanılarak, yüksek sıcaklık üretim yöntemlerinin (karbotermal indirgeme, sol jel, kimyasal buhar biriktirme v.s.) aksine, oda sıcaklığında mekanokimyasal olarak Al2O3/B4C seramik fazının üretilebilirliği araştırılmıştır. Başlangıç malzemeleri farklı sürelerde atritör, planetary ve spekste, argon atmosferi altında işleme tabii tutulmuştur. Sentezlenen seramik faz toz karışımlarının karakterizasyonu için, X-ışını kırınımı (XRD), taramalı elektron mikroskobu (SEM) ve geçirimli elektron mikroskobu (TEM) incelemeleri yapılmıştır. XRD analizi ile speks kullanılarak 10 saatlik öğütme sonunda Al2O3/B4C seramik fazı oluşumu belirlenmiştir. Mekanik enerji ve oluşan seramik faz miktarındaki artış sonucunda, toz boyutundaki küçülme (50-200 nm) ile birlikte topaklanma eğiliminin artışı tespit edilmiştir. Liç işlemi sonrasında safsızlıkların uzaklaştırılıp, seramik fazların etkin olduğu dağılım TEM çalışması ile ortaya çıkarılmıştır.
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