Aşındırıcı Türü ve Boyutunun Otomotiv Fren Balatalarının Sürtünme-Aşınma Performansına Etkisi

Bu çalışmada, aşındırıcı türü ve tane boyutunun otomotiv fren balatalarının sürtünme-aşınma özelliklerine etkisi incelenmiştir. Numune üretiminde farklı tür ve boyut aralıklarına sahip Al2O3,SiC ve B4C seramik tozlar kullanılmıştır. Numunelerin sürtünme ve aşınma davranışları, Chase tipi deney cihazında SAE J661 test prosedürüne uygun olarak tespit edilmiştir. Elde edilen sonuçlardan, en yüksek sürtünme katsayısının Al2O3 içeren A63 kodlu numunede 0,61, en düşük sürtünme katsayısının ise SiC içeren S63 kodlu numunede 0,489 olduğu görülmüştür. B4C içeren B90 kodlu numune en fazla aşınma direnci sergilemiştir. Artan aşındırıcı tane boyutuyla numunelerin sürtünme katsayıları artarken özgül aşınma miktarları azalmıştır. Numunelerin aşınma davranışlarının ve mekanizmalarının ortaya konulması amacıyla da numune aşınma yüzeyleri ve aşınma parçacıkları taramalı elektron mikroskopuyla incelenmiştir.

Anahtar Kelimeler:

Aşındırıcı türü ve boyutu, Fren balatası, Sürtünme-aşınma

Effect of Abrasive Type and Size on the Friction-Wear Performance of Automotive Brake Friction Materials

This study investigated the effects of abrasive type and particle size on the friction-wear characteristics of automotive brake friction materials. The Al2O3, SiC and B4C ceramic powders with different type and particle size were used as abrasive. Friction tests were performed on a Chase friction material testing machine according to the brake lining quality test procedure as per SAE J661. The composites were contained typical ingredients for commercial brake friction materials. The results showed that the highest and the lowest friction coefficients were recorded as 0,61 and 0,489 for Al2O3 containing A63 and SiC containing S63 coded samples. The B90 coded composite containing B4C showed the highest wear resistance. The friction coefficient of the composites increased and the specific wear rate decreased with increasing abrasive particle sizes. In order to reveal the wear behaviour and mechanism, the worn surfaces of the composites as well as wear debris were examined under scanning electron microscopy.

Keywords:

Abrasive type and size, Friction materials, Friction-wear,

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