Akademik Veri Yönetim Sistemi
BOR DERGİSİ, cilt.8, sa.4, ss.144-151, 2023 (Hakemli Dergi)
In
this study, a hybrid mixture was made by adding Chromium (Cr) (1%) in a fixed
ratio by weight to pure copper (Cu) powder and Boron (1%, 2%, 3%) and Boron
carbide (B4C) (1%, 2%, 3%) powders separately in certain ratios.
When the literature studies are examined, there are studies in which B4C
and Cr powders were added to Cu powder separately. However, it was observed
that a hybrid mixture was not made as in this study. In this study, it was
aimed to investigate the tribological effects of the specific properties of
three different reinforcing elements on Cu matrix material. Powder metallurgy
production parameters were utilized to mix Cu powder with Cr, B and B4C
powders. The prepared hybrid composites were tested for microstructure (XRD,
SEM and EDX), hardness and wear at constant sliding distance under dry
conditions. Weight loss plots and coefficient of friction values were generated
for each composite sample. After the wear tests, the wear marks on the wear
surfaces were analyzed by SEM analysis. As a result of hardness and wear tests,
the hybrid composite Cu-Cr-3B gave the best results, while the lowest result
was seen in pure Cu composite. In Cu-Cr-3B composite, 32% better results were
obtained in hardness value and 151% better results were obtained in wear weight
compared to Cu composite. In the post-wear SEM images, it was seen that B and B4C
particles increased the resistance on the wear surface. According to the
results obtained in the study, B and B4C, which have an important
place for our country, increased the tribological properties of Cu matrix
composites and showed that the studies can continue with new hybrid mixtures.