Surface coating of stainless steels by HVOF method and investigation of wear properties

Yıl 2023, Cilt: 12 Sayı: 4, 1289 - 1295, 15.10.2023

Yıldız Yaralı Özbek , Batuhan Özer

https://doi.org/10.28948/ngumuh.1294169

Öz

The surfaces of 316L stainless steels, which are frequently used in the industry due to their mechanical properties, were coated with HVOF method in order to improve their properties. Two different powders for steel surfaces; Diamalloy 2002 (Tungsten Carbide, chromium based) and Metco 7202 (chromium based) powders were prepared in different concentrations. Group A specimens were coated with a mixture of 50% Diamalloy 2002 and 50% Sulzer Metco and Group B specimens were coated with a mixture of 100% Sulzer Metco 7202 by HVOF method. These powders produce coatings that provide wear resistance due to their content. The surface properties of the coated samples were analysed by some methods. Optical and SEM images of all samples were taken and XRD analyses were performed. The coating layer is clearly visible. Some porosity formation was observed. Microhardness values were measured. As a result of hardness measurements, it was determined that the surface hardness increased 4-7 times with the coating. Linear abrasion tests were performed with CSM abrasion tester. It was observed that the abrasion resistance increased. After the abrasion test, roughness measurements and SEM-EDS analyses of the abraded surfaces were performed. Abrasive and adhesive wear formations are present on the worn surfaces.

Anahtar Kelimeler

HVOF, 316 stainless steel, Surface coating, Mechanic properties, Wear

HVOF yöntemi ile paslanmaz çeliklerin yüzeylerin kaplanması ve aşınma özelliklerinin incelenmesi

Öz

Endüstride mekanik özellikleri sebebi ile sıklıkla kullanılan 316L paslanmaz çeliklerin yüzeyleri, özelliklerini iyileştirme amacıyla HVOF yöntemi kaplanmıştır. Çelik yüzeyleri için iki farklı toz; Diamalloy 2002 (Tungsten Karbür, krom esaslı) ve Metco 7202 (krom esaslı) tozları farklı konsantrasyonlarda hazırlanmıştır. A grup numuneler ; %50 Diamalloy 2002 ve %50 Sulzer Metco karışımı ile B grup numuneler ise %100 Sulzer Metco 7202 karışımı ile HVOF yöntemi yardımıyla kaplanmıştır. Bu tozlar içerikleri nedeni ile aşınma dayanımı kazandıran kaplamalar üretmektedirler. Kaplanmış numunelerin yüzey özellikleri bazı yöntemler ile analiz edilmiştir. Tüm numunelerin optik ve SEM görüntüleri alınmış ve XRD analizleri yapılmıştır. Kaplama tabakası net şekilde görülmektedir. Azda olsa bazı porozite oluşumları görülmüştür. Mikrosertlik değerleri ölçülmüştür. Sertlik ölçümleri sonucunda kaplama ile yüzey sertliğinin 5-7 kat arttığı belirlenmiştir. CSM aşınma test cihazı ile lineer aşınma testleri yapılmıştır. Aşınma dayanımlarının arttığı görülmüştür. Aşınma testi sonrası aşınan yüzeylerin pürüzlülük ölçümleri ve SEM-EDS analizleri yapılmıştır. Aşınan yüzeylerde abrasif ve adhesiv aşınma oluşumları mevcuttur.

Anahtar Kelimeler

HVOF, 316L paslanmaz çelik, Yüzey kaplama, Mekanik özellikler, Aşınma

Kaynakça

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