Toz metalurjisi metoduyla üretilen Cr-C takviyeli Cu matrisli kompozitlerin mikroyapı ve mekanik özellikleri

Bu çalışmada saf Cu tozu içerisine farklı oranlarda Cr ve C ilavesi yapılarak toz metalurjisi tekniği (T/M) ile Cu matrisli kompozit malzemeler üretilmiştir. Cu tozu içerisine farklı oranlarda Cr ve C ilave edilerek elde edilen toz karışımları 300 MPa basınç uygulanarak şekillendirilmiştir. Optimum sinterleme sıcaklığının tespit edilmesi amacıyla şekillendirilen numuneler farklı sıcaklıklarda sinterlenmiştir. Sinterleme işlemlerinin başarısı yoğunluk ölçümleri ile değerlendirilmiştir. Üretilen kompozit numunelerin mikroyapı ve mekanik özellikleri karakterize edilmiştir. Mikroyapısal karakterizasyon X-ışınları analizi (XRD), taramalı elektron mikroskobu (SEM) ve enerji dağılım spektrometresi (EDS) incelemeleri ile gerçekleştirilmiştir. Farklı oranlarda Cr ve C ilavesinin mekanik özelliklere etkisi sertlik ölçümleri ve çekme testleri ile değerlendirilmiştir. Yoğunluk ölçümleri artan Cr ve C oranıyla birlikte ulaşılabilen bağıl yoğunluk değerlerinin arttığını göstermiştir. XRD analizi, Cr’un sinterleme işlemi esnasında mikroyapıda karbür ve nitrür bileşikleri oluşturduğunu göstermiştir. Oluşan bu bileşiklere bağlı olarak artan Cr ve C oranıyla birlikte elde edilen sertlik değerleri de artmıştır.

Anahtar Kelimeler:

Cu, Cr-C, kompozit, mikroyapı, sertlik, çekme dayanımı

Microstructural and mechanical properties of Cr-C reinforced Cu matrix composites produced through powder metallurgy method

In this study, Cu matrix composite materials were produced by powder metallurgy technique (PM) by adding Cr and C at different ratios to pure Cu powder. Powder mixtures obtained by adding Cr and C at various ratios into the Cu powder were shaped by applying a pressure of 300 MPa. The specimens were sintered at different temperatures in order to determine the optimum sintering temperature. The success of the sintering process was evaluated by density measurements. The microstructure and mechanical properties of the produced composite specimens are characterized. Microstructural characterization was performed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) analyses. The effects of Cr and C addition on mechanical properties at different ratios were evaluated by hardness measurements and tensile tests. Density measurements have shown that the relative density values that can be achieved with increased Cr and C ratios are increased. XRD analysis showed that Cr formed carbide and nitride compounds in the microstructure during sintering. The hardness values obtained with these Cr and C ratios increased with the increase of these compounds.

Keywords:

Cu, Cr-C, composite, microstructure, hardness, tensile strength,

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