Wear Properties of TiN Coating Formed on AISI D2 Surface

Öz

In this work, the wear test of uncoated and titanium nitride coated AISI D2 cold work tool steel against silicon nitride ball was realized at 0.3 m/s sliding speed and under the loads of 2.5N, 5N and 10N. Steel samples were nitrided at 575°C for 8 h in the first step of the coating process, and then titanium nitride coating was performed by pack diffusion coating in a powder mixture consisting of ferro-titanium, ammonium chloride and alumina at 1000°C for 2h. Nitro-titanized samples were characterized by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), micro-hardness and ball on disk wear tests. X-ray studies showed that the phases formed on the coated steel surfaces are TiN and Ti0.5Cr0.5N. The average hardness of the layer is 1450±30 HV0.005. The friction coefficient value of TiN layer is ranging between 0.136–0.203. The specific wear rate of coated steel is 0.982×10-5 mm3/Nm. © Afyon Kocatepe Üniversitesi

Anahtar Kelimeler

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AISI D2 Yüzeyinde Oluşturulan TiN Kaplamanın Aşınma Özellikleri

Öz

Bu çalışmada, kaplanmamış ve titanyum nitrür (TiN) kaplanmış AISI D2 soğuk iş takım çeliğinin silisyum nitrür bilyeye karşı 0.3 m/s hızda, 2.5N, 5N ve 10N yükler altındaki aşınma davranışı test edilmiştir. Çelik numuneler öncelikli olarak 575°C’de 8 saat süre ile nitrürlenmiştir. Nitrürlenmiş numunelerin yüzeyinde, 1000°C’de 2 saat süreyle, ferro-titanyum, amonyum klorür ve alüminadan oluşan toz karışımı içerisinde kutu difüzyon kaplama yöntemi ile TiN tabakası oluşturulmuştur. Nitrotitanyumlanmış numuneler, X-ışınları difraksiyon analizi (XRD), taramalı elektron mikroskobu (SEM), mikro sertlik ve ball-on-disk aşınma testleri ile karakterize edilmiştir. X-ışınları çalışmaları çelik yüzeyi üzerinde oluşturulmuş kaplamanın TiN ve Ti0.5Cr0.5N fazlarını içerdiğini göstermektedir. Tabakanın ortalama sertlik değeri 1450±30 HV0.005 olarak ölçülmüştür. TiN kaplamanın aşınma testlerinde elde edilen sürtünme katsayısı değerleri 0.136 – 0.203 aralığındadır. Kaplanmış yüzeyin spesifik aşınma hızı 0.982×10-5 mm3/Nm olarak tespit edilmiştir

Anahtar Kelimeler

• Kaplama, TiN, Aşınma, Kutu difüzyon

Kaynakça

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