Microstructure and Wear Properties of Hot-Pressed NiCrBSi/TiC Composite Materials
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EFRACTORY, CERAMIC, AND COMPOSITE MATERIALS
Microstructure and Wear Properties of Hot-Pressed NiCrBSi/TiC Composite Materials S. Islaka, *, M. Ulutanb, **, and S. Buytozc, *** a
Kastamonu University, Faculty of Engineering and Architecture, Department of Mechanical Engineering, Kastamonu, TR-37150 Turkey b Eskişehir Osmangazi University, Faculty of Engineering-Architecture, Department of Mechanical Engineering, Eskişehir, TR-26480 Turkey c Fırat University, Faculty of Technology, Department of Metallurgy and Materials Engineering, Elazığ, TR-23100 Turkey *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] Received March 18, 2020; revised June 29, 2020; accepted July 2, 2020
Abstract—In this study, TiC-reinforced NiCrBSi matrix composite materials were produced using the hot pressing powder metallurgy (PM) technique. The effect of the addition of titanium carbide to NiCrBSi powder in different proportions (5, 10, and 20 wt %) on the microstructure, hardness, relative density, and wear properties of composites was investigated experimentally. NiCrBSi–TiC composites were produced for 10 min at 1000°C with an applied pressure of 45 MPa using a vacuum-assisted automatic hot-pressing machine. The wear behaviors of the composites were compared through dry sliding wear tests. Wear rates and coefficient of friction (COF) values were observed of composites. In addition, the main wear mechanisms are investigated by using SEM and EDS analyses of the worn surfaces. The wear rates of the composites were decreased by increasing the TiC content. Keywords: NiCrBSi, titanium carbide, friction, metal-matrix composites (MMCs), wear DOI: 10.3103/S1067821220050053
1. INTRODUCTION Metal matrix composites (MMCs), which have good wear resistance, hardness, and corrosion resistance are preferred in industry in comparison to nonreinforced alloys [1–3]. Nickel-based alloys are popular as matrix materials because they are resistant to high-temperature conditions. These alloys are particularly used in forming composite layers or coatings on the surfaces of materials. For example, Serres et al. [4] produced NiCrBSi–WC composite coatings by a hybrid plasma/laser process. They found that the process can be applied to simultaneously melt composite materials with high melting temperature and high hardness without the propagation of cracks. Cai et al. [5] formed Ni/TiC composite coatings on AISI 1045 carbon steel substrates by spray plasma spray technology. These composite coatings were mainly composed of TiC, γ-Ni, Cr7C3 and CrB and exhibited excellent tribological properties under different loads. Buytoz et al. [6] used NiCrBSi and different proportions of SiC powders to produce the composite coatings on SAE 1030 steel. They observed that the coefficients of friction (COFs) and wear rate of all samples with
HVOF coatings were lower than those of the SAE 1030 steel. The increase in the amount of SiC powder had a beneficial influence on the COF and the wear rate of composite layers. Zikin et al. [7] investiga
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