Experimental Investigation of Braking Performance on Cr2O3 Coated Brake Disk by Plasma Spray Technique

Abstract

In this study, front brake discs with air ventilated belonging to a light commercial vehicle were used. The disk used in the tests has an outer diameter of 257 mm, inner diameter of 150 mm, 22 mm thickness, 5328.73 g. The samples were plated with Cr2O3 by using a plasma spray technique. OEM and coated discs are tested in inertia dynamometer according to performance standards; bedding-in and hot judder I-II. In addition to the thickness and mass measurements of the disks before and after the tests performed in inertia dynamometer, the surface roughness values were also measured and the wear rates were determined. In addition, the samples taken from the discs after the tests were subjected to corrosion test in accordance with TS EN ISO 9227 test standard. After the tests and measurements carried out, it has been determined that; both disc temperatures were close and fluctuating depending on the number of braking in every braking procedure; OEM disc had significantly higher friction coefficient in the bending test procedure, the outer surface of the coated disc was worn out and the outer pad was heavily damaged and also in the corrosion test, the original disc was exposed to intensive corrosion.

Keywords

• Brake disk
• Coating
• Cr2O3
• Inertia dynamometer
• Brake performance

Plazma Sprey Tekniği ile Cr2O3 Kaplanmış Fren Diskinin Frenleme Performansının Deneysel Olarak İncelenmesi

Öz

Bu çalışmada hafif ticari araca ait kanatçıklı soğutmalı ön fren diskleri kullanılmıştır. Testlerde kullanılan disk 257 mm dış, 150 mm iç çapa, 22 mm kalınlığa, 5328,73 g ağırlığa sahiptir. Numune ise plazma sprey tekniği kullanılarak Cr₂O₃ ile kaplanmıştır. Kaplanmış diskin performans standartlarına uygun olarak atalet dinamometresinde alış(tır)ma ve ısıl titreşim (hot judder I-II) özellikleri incelenmiştir. Yapılan testler öncesi ve sonrasında disklerin kalınlık ve kütlesel ölçümlerinin yanında yüzey pürüzlülük değerleri de ölçülerek aşınma oranları tespit edilmiştir. Ayrıca testler sonrası disklerden alınan numuneler TS EN ISO 9227 test standardına uygun olarak korozyon testine tabi tutulmuştur.

Anahtar Kelimeler

• Fren diski
• Kaplama
• Cr2O3
• Atalet dinamometresi
• Frenleme performansı

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