Sürdürülebilir Kalkınma Amaçları

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• MakaleAçık Erişim2025/r/munzur/5693
  Investigation of the Effect of Liquid Phase on Hot Pressed Bronze-Nickel-Cobalt Matrices

  Çelık, Ertugrul; Tunç, Büşra

  In this study, a metal matrix composite material consisting of 80% bronze, 15% nickel (Ni), and 5% cobalt (Co) was produced. Bronze is commonly known as a copper-tin alloy and offers high corrosion resistance and mechanical durability. Nickel enhances corrosion and oxidation resistance in metal matrix composites, while cobalt improves hardness and wear resistance. The composite material was further enriched with AgCd alloy in proportions of 2%, 4%, and 6%. The material production process involved the application of the liquid phase sintering technique using hot pressing. This method enables the achievement of high density and good mechanical properties. Sintering was conducted at different temperatures (650, 700, 750°C), and the effect of temperature on the microstructural characteristics of the material was investigated. During the analysis phase, the microstructure of the material was examined using SEM and elemental analysis was performed using EDS. Hardness testing was employed to evaluate the mechanical durability of the material. Density, defined as the mass-to-volume ratio, provided information about the material's internal structure. Three-point bending tests measured the bending strength of the material, while fracture surface analysis revealed the material's fracture behavior. XRD was used to determine the crystalline structure and phase composition of the material. The results demonstrated the effects of temperature variations and Ag-Cd addition ratios on the microstructure and mechanical properties of the composite material. Significant improvements in the material's durability, hardness, and other physical properties were observed due to the liquid phase sintering and hot pressing processes.

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• MakaleAçık Erişim2023/r/munzur/5791
  Experimental investigation of engineering properties of silica sand filled mortars containing high doses of SWCNT

  Subaşı, Serkan; Dehghanpour, Heydar; Maraşlı, Muhammed; Doğan, Fatih

  Recently, great efforts have been made by researchers on the mixture of electrically conductive concretes that have been developed for different purposes. In this study, an experimental research was carried out on electrically conductive mortar mixtures especially for shell elements produced for building facade cladding. Six different mixtures were produced, including the non-conductive reference mixture. Single-walled carbon nanotube (SWCNT) was used as nano-sized conductive additive material. SWCNT was added at 0.2% and 0.3% of cement weight. SF was added to the same mixtures as another group at the rate of 4% by total weight. 2, 14, 28, 90 and 180 days electrical resistivities of the obtained conductive mortar samples were measured. As a non-destructive method, dynamic resonance testing was performed and the 28-day damping rates of the samples were determined. Ultrasonic pulse velocity (UPV) and Leeb hardness tests were performed, respectively, by using other non-destructive testing methods to obtain information about the internal structure voids and surface hardness of the samples. SWCNT, which causes low machinability and therefore internal structure voids, caused a decrease in compressive strength and flexural strength, as well as a significant increase in electrical conductivity.

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  AtıfOpenAlex1

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• MakaleYalnız künye2017/r/munzur/4982
  Taguchi Tekniği Kullanılarak SAE 1021/ Dillidur 400 / Dillimax 500 Çeliklerinin Sürtünme Kaynağı için İşlem Parametrelerinin Optimizasyonu

  Celik, Ertugrul; Eski, Özkan; Uzun, Arif

  Bu çalışmanın amacı sürtünme kaynağı ile birleştirilen SAE 1021 karbonlu çelikler ile aşınma direnci yüksek Dilludur 400 ve yüksek dayanıma sahip Dillimax 500 çeliklerin mekanik özellikleri üzerine etki eden parametrelerin optimizasyonunu Taguchi analiz yöntemi ile sağlamaktır. Taguchi analizi, yığma basıncı ve sürtünme devir hızı gibi kaynak parametreleri ile birleştirilen malzeme türlerini optimize etmek için istatiksel deneysel tasarım olarak kullanılmaktadır. Bu amaçla çelikler 1250, 1500 ve 1750 dev/dak sürtünme devirlerinde ve 4, 6 ve 8 MPa yığma basınçlarında birleştirilmiştir. Bağlantının mekanik özelliklerini belirlemek için çekme testi ve mikro sertlik ölçümleri uygulanmıştır. Analiz sonuçlara göre malzeme çifti olarak Dillidur 400-Dilimax 500, sürtünme devri olarak 1500 dev/dak ve yığma basıncının 6 MPa seçilebileceği tespit edilmiştir. Ayrıca deneysel sonuçlara göre maksimum çekme dayanımı 651 MPa ile Dillidur 400- Dillidmax 500 çiftinde elde edilmiştir. Aynı malzeme çiftinde kaynak ara yüzeyi sertlik değeri 353 HV'dir

  AtıfTR Dizin1

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