ZrO2-8% Y2O3 Kaplamaların Mikroyapı Ve Mekanik Özellikleri Üzerine Isıl İşlemin Etkisi
Bu çalışmada, plazma sprey yöntemi ile AISI 316L üzerinde üretilmiş ZrO2-%8 Y2O3 kaplamaların mikroyapı ve mekanik özellikleri üzerine ısıl işlemin etkisi araştırılmıştır. Seramik kaplamalar, 900°C, 1000°C ve 1100°C sıcaklıklarda ısıl işlem prosesine tabi tutulmuştur. Kaplama tabakalarının faz bileşimi ve mikroyapısı X-ışını difraktogramı (XRD) ve taramalı elektron mikroskobu (SEM) ile incelenmiştir. Kaplamaların aşınma özellikleri ASTM G133 test standartları referans alınarak aşınma test cihazında ball on disk yöntemi ile test edilmiştir. SEM çalışmalarına göre, en fazla gözenek oluşumu ısıl işlemsiz numunede görülürken, ısıl işlem sıcaklığı arttıkça gözenek miktarının azaldığı tespit edilmiştir. Fakat ısıl işlemin arayüzey bağlanmasına olumsuz etki ettiği de kaçınılmaz bir sonuç olarak elde edilmiştir. Kaplama mikroyapısında t-ZrO2 ve c-ZrO2 fazlarının oluştuğu XRD analizlerinden belirlenmiştir. Sonuçlar, ısıl işlem sıcaklığının artmasıyla, kaplamaların sertliklerinde artış olduğunu ve sürtünme katsayılarında ve aşınma oranlarında ise azalma meydana geldiğini göstermiştir.
Anahtar Kelimeler:
Plazma Sprey, ZrO2-%8 Y2O3, Kaplama, Isıl İşlem, AISI 316L
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- Başlangıç: 2009
- Yayıncı: E-Journal of New World Sciences Academy