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Za27 matrisli hibrit kompozit malzemelerin farklı ortamlarda aşınma davranışının incelenmesi

Investigation of wear behavior of za27 matrix hybrid composite materials in different environments

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  1. Tez No: 972017
  2. Yazar: ÜMİT KARATAŞ
  3. Danışmanlar: DOÇ. DR. SERDAR ASLAN
  4. Tez Türü: Yüksek Lisans
  5. Konular: Metalurji Mühendisliği, Metallurgical Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2025
  8. Dil: Türkçe
  9. Üniversite: Sakarya Üniversitesi
  10. Enstitü: Fen Bilimleri Enstitüsü
  11. Ana Bilim Dalı: Metalurji ve Malzeme Mühendisliği Ana Bilim Dalı
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: Belirtilmemiş.

Özet

Mühendislik uygulamalarında artan talepler, daha dayanıklı ve yüksek performanslı malzemelere olan ihtiyacı artırmıştır. Geleneksel mühendislik malzemelerinin aşınma direnci ve mekanik özellikleri belirli sınırlar içerisinde kalmakta, bu da yeni nesil kompozit malzemelerin geliştirilmesini gerektirmektedir. Bu çalışmada, ZA27 çinko-alüminyum alaşımı matris olarak kullanılarak alaşım, kompozit ve hibrit kompozitler üretilmiş ve farklı ortamlarda aşınma davranışları incelenmiştir. Tez kapsamında, ZA27 alaşımına %20 oranında silisyum karbür (SiC) eklenerek kompozit malzemeler üretilmiş ve farklı oranlarda grafit (Gr) takviyesi ile hibrit kompozitler elde edilmiştir. Takviye malzemelerinin homojen dağılımını sağlamak amacıyla vorteks-sıkıştırma döküm yöntemi tercih edilmiştir. Üretilen numuneler, kuru ve yağlı ortamlarda 3N ve 5N yükler altında aşınma testlerine tabi tutulmuş, sürtünme katsayısı ve aşınma davranışları incelenmiştir. Testler, ball-on-disc yöntemi kullanılarak 1000 metre mesafede, 0,1 m/s hızla ve alümina (Al₂O₃) aşındırıcı bilya kullanılarak gerçekleştirilmiştir. Aşınma yüzeyleri, taramalı elektron mikroskobu (SEM) ve enerji dağılım spektroskopisi (EDS) ile analiz edilmiş, ayrıca üretilen malzemelerin sertlik değerleri belirlenmiştir. Aşınma sonrası yüzey pürüzlülükleri profilometre ile ölçülerek aşınma iz genişlikleri ve aşınma yüzeylerinin detaylı görüntüleri elde edilmiş değerlendirilmiştir. Deneysel sonuçlar, SiC takviyesinin malzemenin yük taşıma kapasitesini ve sertliğini artırdığını, grafit ilavesinin ise sürtünme katsayısını düşürdüğünü göstermiştir. Özellikle %10 grafit içeren hibrit kompozit, düşük sürtünme katsayısı ve yüksek aşınma direnci ile en iyi performansı sergilemiştir. Ayrıca, kuru ortamda adeziv ve abraziv aşınma mekanizmalarının, yağlı ortamda ise daha hafif aşınma mekanizmalarının etkili olduğu gözlemlenmiştir. Profilometre incelemeleri, grafit içeriğinin artmasıyla birlikte yüzey pürüzlülüğünün azaldığını göstermiştir. Bu çalışma, ZA27 matrisli hibrit kompozitlerin aşınma direnci gerektiren endüstriyel uygulamalar için uygun bir alternatif olduğunu göstermektedir. Yapılan aşınma testleri, SiC takviyesinin malzemenin sertlik ve yük taşıma kapasitesini artırdığını, grafit ilavesinin ise sürtünme katsayısını düşürerek aşınma direncini iyileştirdiğini ortaya koymuştur. Özellikle %10 grafit içeren hibrit kompozitler hem kuru hem de yağlı ortamda en iyi performansı sergilemiştir. Gelecekte farklı üretim yöntemleri, test koşulları ve çevresel faktörler incelenerek, bu malzemelerin uzun vadeli dayanıklılığı artırılabilir ve mühendislik uygulamalarındaki potansiyeli genişletilebilir.

Özet (Çeviri)

The increasing demands in engineering applications have rapidly raised the need for innovative materials. The mechanical, thermal, and chemical limitations of traditional materials often fall short, leading to the search for new materials. This need has heightened interest in composite materials that combine properties such as high strength, lightness, durability, and longevity. In this study, the ZA27 zinc-aluminum alloy was selected as the matrix material. ZA27 stands out with its low melting point, high tensile strength, excellent castability, and corrosion resistance. To improve the properties of this alloy, 20% silicon carbide (SiC) reinforcement was added, and hybrid composite materials containing varying amounts of graphite (Gr) were produced. The vortex-compression casting method, which ensures homogeneous distribution of reinforcement materials and enhances casting quality, was employed. Wear tests were conducted on the produced samples in dry and lubricated environments under 3N and 5N loads over a distance of 1000 meters at a constant speed of 0.1 m/s using the pin-on-disk method with alumina (Al₂O₃) as the abrasive. After the tests, surface roughness was measured using a profilometer, wear traces were imaged with a scanning electron microscope (SEM), and point analyses were performed using energy dispersive spectroscopy (EDS). Test results showed that SiC reinforcement increased the load-carrying capacity of the material, while graphite supplementation provided a lubricating effect by reducing the coefficient of friction. The hybrid composite with 10% graphite reinforcement exhibited the best performance in both dry and lubricated conditions, standing out with a low coefficient of friction and high wear resistance. The types of wear observed in ZA27 hybrid composites varied depending on the test conditions and material combinations used. Generally, adhesive wear and abrasive wear were more prominent in dry test environments. Adhesive wear occurred due to material transfer or microscopic particle detachment caused by high friction between contact surfaces. This was largely mitigated by the addition of SiC reinforcement, which enhanced load-carrying capacity through increased hardness, and graphite, which reduced metal-to-metal contact by providing a lubricating effect. Abrasive wear, on the other hand, resulted from the abrasive action of the alumina (Al₂O₃) disk during testing. This type of wear was significantly minimized by the wear resistance contribution of SiC reinforcement. In lubricated test environments, the lubricating effect of graphite and the protective film formed by the lubricant led to a noticeable reduction in wear rates. In these conditions, milder wear mechanisms, such as thin film sliding or micropitting, were predominantly observed. The combined effects of SiC's hardness and resistance-enhancing properties and graphite's friction-reducing characteristics enabled the hybrid composites to exhibit superior performance against all types of wear. The tribological properties of ZA27-based hybrid composites were analyzed in detail. The tribological system consists of the main material (ZA27 hybrid composites), the counter material (metal ball), the lubricant (if applied), the load (3N or 5N), motion, and environmental conditions. The synergistic effects of SiC and graphite reinforcements significantly improved the tribological performance of the hybrid composites. The effects of SiC and graphite in hybrid composites play a critical role in enhancing the mechanical and tribological performance of the material. SiC, with its high hardness and thermal stability, emerges as a reinforcement material that increases the wear resistance and load-carrying capacity of the matrix material. When integrated into the ZA27 matrix, SiC particles form a micro-level barrier on the contact surface, slowing down the wear process. This enhances the material's durability even under challenging operating conditions. On the other hand, graphite significantly reduces the coefficient of friction in the tribological system due to its solid lubricating properties. Graphite particles form a thin layer between surfaces, minimizing metal-to-metal contact and reducing surface damage caused by friction. This effect is particularly evident in dry condition tests. In lubricated environments, the lubricating effect of graphite supports the reduction in the coefficient of friction and plays a crucial role in extending the material's lifespan. The synergistic effects of SiC and graphite enable ZA27 hybrid composites to exhibit superior properties in terms of both mechanical strength and tribological performance. The contribution of SiC to high wear resistance combined with the low friction coefficient provided by graphite makes these materials an ideal solution for a wide range of applications. It was also observed that an increase in graphite content led to a reduction in the coefficient of friction and less surface damage. This combination makes ZA27 hybrid composites a reliable alternative for demanding industrial conditions. The mechanical and tribological properties of the ZA27 alloy combine high wear resistance with a low coefficient of friction. While the solid lubricating effect of graphite minimizes surface damage, SiC particles enhance the material's durability and load-carrying capacity. These properties make ZA27-based hybrid composites highly suitable for industrial applications. One of the greatest advantages of ZA27 hybrid composite materials is their proven suitability for various applications, tested under different conditions. In lubricated environment tests, the lubricating effect of graphite provided a significant reduction in the coefficient of friction and played a critical role in extending the material's lifespan. In dry environments, the contribution of SiC particles to wear resistance revealed the advantages of the hybrid structure under conditions where the effect of graphite diminished. The promising tribological and mechanical properties of ZA27-based hybrid composites open the door to a variety of industrial applications where performance and efficiency are critical. In the automotive industry, these materials can be utilized in components such as gears, bearings, and brake pads, where wear resistance and a low coefficient of friction are paramount. Similarly, in aerospace applications, the lightweight yet durable nature of these composites offers the potential to reduce overall weight without compromising structural integrity. The combination of SiC's reinforcement capabilities and graphite's lubricating properties ensures reliability even in high-stress or high-temperature environments, making these materials ideal candidates for demanding operational conditions. Future research could delve deeper into optimizing the balance between SiC and graphite content to tailor the material's performance for specific applications. Investigations into alternative manufacturing techniques, such as additive manufacturing or powder metallurgy, could further enhance the microstructural properties and uniformity of the composites. Additionally, long-term environmental testing, including high-temperature and corrosive conditions, would provide invaluable insights into the durability and sustainability of ZA27-based hybrid composites. By addressing these aspects, the potential for these advanced materials to revolutionize a range of industries can be fully realized. In conclusion, this study demonstrated that ZA27 matrix hybrid composites are a suitable alternative for challenging tribological environments. These materials show promising potential for use in industrial fields such as automotive, aerospace, and machinery components due to their remarkable wear and friction performance. Future studies may reveal that different production techniques and reinforcement configurations could further optimize the properties of these materials. Additionally, long-term durability and energy-saving potential can be explored on a broader scale.

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