OXIDATION BEHAVIOR OF POROUS ZRB2 PELLETS AT DIFFERENT TEMPERATURES

Öz

In this study, cyclic oxidation of cold pressed porous ZrB2 pellets at different temperatures was investigated. Oxidation tests were performed at 800˚C, 1000˚C, and 1200˚C for 1, 2, 5, 10, 15 and 20 hours. As a result of experiments, ZrO2 ZrB2, B70 and B2O3 have been found to occur as corrosion product. At the same time it was observed that oxidation behaviour of pellets depend on temperature and time. When analysis results and microstructures were evaluated, it is concluded that behavior of the B2O3 phases at different temperatures has a significant effect on the oxidation of the samples

Anahtar Kelimeler

• Cyclic oxidation, zirconium diboride (ZrB2), oxidation behaviour

GÖZENEKLİ ZRB2 PELETLERİN FARKLI SICAKLIKLARDAKİ OKSİDASYON DAVRANIŞLARI

Öz

Bu çalışmada soğuk preslenmiş gözenekli ZrB2 peletlerinin farklı incelenmiştir. Oksidasyon deneyleri 800˚C, 1000˚C ve 1200˚C sıcaklıklarda 1, 2, 5, 10, 15 ve 20 saat süreler ile yapılmıştır. Deneylerin sonucunda korozyon ürünü olarak ZrO2, ZrB2, B70 ve B2O3 fazlarının oluştuğu tespit edilmiştir. Aynı zamanda peletlerin oksidasyon davranışlarının sıcaklığa ve zamana bağlı olduğu gözlenmiştir. değerlendirildiğinde, oluşan B2O3 fazının farklı sıcaklıklardaki davranışının numunelerin oksidasyon davranışında önemli bir etkisi olduğu sonucuna varılmıştır

Anahtar Kelimeler

• Döngüsel oksidasyon, zirkonyum diborür (ZrB2), oksidasyon davranışı

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