Wear properties of Cu-Cr-B4C-CNF hybrid composites produced by powder metallurgy method

Abstract

Despite the excellent properties of copper such as high electrical conductivity and high thermal conductivity, the fact that its mechanical properties are weak reveals the fact that its mechanical properties have been improved. In this study, the wear properties of Cu-Cr-B4C-CNF hybrid composites produced by powder metallurgy were experimentally investigated in order to improve their mechanical properties. Pin-on-disc wear method was used to determine the wear performance of the composites. Three different wear loads (5N, 10N and 15N) were selected in the wear test. According to the wear results, while the friction coefficients and wear rates decreased depending on the reinforcement ratios, both the friction coefficients and the wear rates increased with the increase of the wear loads. According to the SEM photographs taken from the surface after the wear process, both adhesive and abrasive wear mechanisms are the dominant wear types.

Keywords

• Wear
• hybrid composite
• copper
• powder metallurgy

Toz metalürjisi yöntemi ile üretilen Cu-Cr-B4C-CNF hibrit kompozitlerin aşınma özellikleri

Abstract

Bakırın yüksek elektriksel iletkenlik ve yüksek termal iletkenlik gibi mükemmel özelliklerine rağmen mekanik özelliklerinin zayıf olması, mekanik özelliklerinin geliştirilmesi gerçeğini ortaya koymaktadır. Bu çalışmada toz metalürjisi ile üretilen Cu-Cr-B4C-CNF hibrit kompozitlerin mekanik özelliklerini iyileştirmek amacıyla aşınma özellikleri deneysel olarak araştırılmıştır. Kompozitlerin aşınma performanslarını belirlemek amacıyla pin-on-disk aşınma metodu kullanılmıştır. Aşınma testinde üç farklı aşınma yükü (5N, 10N ve 15N) seçilmiştir. Aşınma sonuçlarına göre, takviye oranlarına bağlı olarak sürtünme katsayılarında ve aşınma oranlarında azalma meydana gelirken, aşınma yüklerinin artmasıyla hem sürtünme katsayılarında hem de aşınma oranlarında artışlar meydana gelmiştir. Aşınma işleminden sonra yüzeyden alınan SEM fotoğraflarına göre hem adhezif hem de abrasiv aşınma mekanizmaları hâkim aşınma türleridir.

Keywords

• Aşınma
• hibrit kompozit
• bakır
• toz metalurjisi

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