Ni3Al partikülleri ile pekiştirilmiş bronz matrisli kompozitlerin kuru sürtünme ve aşınma davranışları

Yıl 2017, Cilt: 23 Sayı: 1, 40 - 44, 01.03.2017

İbrahim Çelikyürek Aytaç Biçer

Öz

Ni₃Al
partikülleri ile pekiştirilmiş bronz esaslı kompozit klasik toz metalurjisi
(TM) tekniği ile üretilmiştir. Pekiştirici olarak kullanılan partiküller döküm
Ni₃Al alaşımının bilyeli değirmende öğütülmesiyle üretilmiştir.
Bronz alaşımı bileşenlerinin tozları ve Ni₃Al (ağ. %1, 75-100mm partikül boyutunda) karıştırılmış, eksenel olarak
sıkıştırılmış ve sinterlenerek kompozit malzeme elde edilmiştir. Kompozit ışık
mikroskobu ve taramalı elektron mikroskobu kullanılarak karakterize edilmiştir.
Basma mukavemetleri ve sertlikler belirlenmiştir. Kompozitin ve pekiştirilmemiş
bronzun tribolojik özellikleri disk üzerinde pim geometrisinde belirlenmiş ve
sonuçlar geleneksel fenolik reçine ile bağlanan fren balatası ile
karşılaştırılmıştır. Sonuçlar TM bronzun kompozitten daha mukavemetli olduğunu
göstermiştir. Kompozitin sertliği TM bronzdan daha yüksektir. Sürtünme ve
aşınma testleri kompozitin aşınma direncinin ve sürtünme katsayısının
geleneksel balatadan daha yüksek olduğunu açığa çıkarmıştır.

Anahtar Kelimeler

Metal matrisli kompozitler, Fren balatası, Mukavemet, Sertlik, Sürtünme ve aşınma

Dry sliding friction and wear behaviours of bronze matrix composites reinforced with Ni3Al particles

Öz

The
bronze based composite reinforced with Ni₃Al particles was produced
by classical powder metallurgy (PM) technique. Particles used as reinforcement
were produced via ball milling of Ni₃Al cast alloy. The powders of
constituents of bronze and Ni₃Al powder (1%wt.75-100mm particle in size) were mixed, compacted axially and
sintered. The composite was characterized using light microscopy and scanning
electron microscopy. The compression strength and hardness of composites were
determined. The tribological properties of composite and unreinforced bronze
were determined at pin-on-disc geometry and results were compared with
conventional phenolic resin bonded brake lining. The results revealed that PM
bronze has higher strength than composite. The hardness of composite is higher
than PM bronze. The sliding and wear tests revealed that the wear resistance
and coefficient of friction of composite are higher than conventional brake
lining.

Anahtar Kelimeler

Metal matrix composites, Brake lining, Strength, Hardness, Friction and wear

Kaynakça

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