55TiO2-Cr2O3 Kaplamanın Frenleme Performansına Etkisinin Araştırılması

Öz

Bu çalışmada, 55TiO2-Cr2O3 (Metco111) seramik toz, atmosferik plazma püskürme (APS) kaplama tekniği ile dökme demir disk üzerine kaplanmıştır. Kaplamanın SAE J2430 frenleme test standardına göre sürtünme katsayısı davranışına etkisi incelenmiştir. 55TiO2-Cr2O3kaplanmış ve kaplanmamış diskin mekanik ve mikro yapısal karakterizasyonu araştırılmıştır. Sıcaklık ve hızın artmasıyla birlikte, sürtünme katsayısı (COF) ve aşınma oranı azalmıştır. Kaplanmış ve kaplanmamış yüzeyler taramalı elektron mikroskobuyla (SEM), ışık mikroskobu (LM) ile incelenip enerji dispersif spektrometresi (EDS) yardımıyla analiz edilmiştir. Numunelerin yüzey pürüzlülüğü ve mikro sertlik testleri yapılmıştır. Krom ve Titanyum'ca zengin kaplamalarda yük ve sıcaklığın artmasıyla Cr, Ti yağlayıcı film olarak görev yaptığından kaplamanın sürtünme katsayısı ve aşınma oranı kaplamasız diskten düşük çıkmıştır. Kaplamalı diskin daha düşük aşınması, titanyum ve krom oksitlerin oluşturduğu yüzey filminin sert yapısına ve yağlayıcılık özelliğine bağlanmıştır. Mikro yapı analizlerinden kaplamanın metalürjik olarak problemsiz olduğu tespit edilmiştir.

Anahtar Kelimeler

• Crom Oksit
• Titanyum Oksit
• Plazma Püskürtme
• Aşınma
• Frenleme Performansı

Kaynakça

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