Investigation of wear behaviour of TiO2 and Al2O3 reinforced YSZ coating

Abstract

In this study, three different ceramic powders used as thermal barriers were coated on AISI304 stainless steel by the atmospheric plasma spray method. A pin-on-disc apparatus was utilised to investigate the wear characteristics of the coatings. The effect of wear behavior of the addition of Al2O3 and titanium dioxide (TiO2) into the YSZ coating was investigated. Before the wear test, sanding and polishing processes were carried out to ensure that the average surface roughness of the coatings was less than 0.8 µm. The wear test according to ASTM G99-04, was conducted on a pin-on-disc device at a speed of 143 rpm. The test was performed in a dry condition, with a minimum of 8000 cycles. The wear test utilised a 4N load and 6 mm-diameter Al2O3 balls. The surface properties and wear characteristics of the coatings were analysed using a scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) after conducting coating and wear tests. The wear rate of the samples was assessed using optical profilometry. A micro Vickers test equipment was employed to assess the microhardness of the materials. The findings demonstrated that the inclusion of Al2O3 in YSZ led to an enhancement in wear resistance, but the incorporation of TiO2 resulted in a notable reduction in wear resistance.

Keywords

• Wear
• Ceramic Coatings
• Hardness
• YSZ

TiO2 ve Al2O3 takviyeli YSZ kaplamanın aşınma davranışının incelenmesi

Abstract

Bu çalışmada termal bariyer olarak kullanılan üç farklı seramik tozu AISI304 paslanmaz çelik üzerine atmosferik plazma püskürtme yöntemiyle kaplanmıştır. Kaplamaların aşınma özelliklerini araştırmak için pin-on-disk aparatı kullanıldı. YSZ kaplamaya Al2O3 ve titanyum dioksit (TiO2) ilavesinin aşınma davranışına etkisi araştırıldı. Aşınma testi öncesinde kaplamaların ortalama yüzey pürüzlülüğünün 0,8 µm'den az olmasını sağlamak amacıyla zımparalama ve cilalama işlemleri yapıldı. ASTM G99-04'e göre aşınma testi, pin-on-disk cihazında 143 rpm hızında gerçekleştirildi. Test, minimum 8000 döngü ile kuru bir durumda gerçekleştirildi. Aşınma testinde 4N yük ve 6 mm çaplı Al2O3 bilyalar kullanıldı. Kaplamaların yüzey özellikleri ve aşınma özellikleri, kaplama ve aşınma testleri yapıldıktan sonra taramalı elektron mikroskobu (SEM) ve enerji dağılımlı X-ışını spektroskopisi (EDS) kullanılarak analiz edildi. Numunelerin aşınma oranı optik profilometri kullanılarak değerlendirildi. Malzemelerin mikro sertliğini değerlendirmek için mikro vickers test ekipmanı kullanıldı. Bulgular, Al2O3'ün YSZ'ye dahil edilmesinin aşınma direncinde bir artışa yol açtığını, ancak TiO2'nin dahil edilmesinin aşınma direncinde dikkate değer bir azalmaya yol açtığını gösterdi.

Keywords

• Aşınma Dayanımı
• Seramik Kaplamalar
• Sertlik
• YSZ

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