Yazar "Er, Yusuf" seçeneğine göre listele

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    Effect of the powder particle size on the wear behavior of boronized AISI 304 stainless steel
    (Carl Hanser Verlag, 2015) Gunen, Ali; Kucuk, Yilmaz; Er, Yusuf; Cay, V. Veli; Oge, Mecit; Gok, M. Sabri
    In this study, the AISI 304 steel specimens were boronized with nanoboron of the size of 10-50 nm and commercial Ekabor 3 powders (<1400 mu m) at 950 degrees C to 1000 degrees C for 2 h and 4 h. Boronized steel specimens were characterized via SEM, microhardness and XRD analyses. Abrasive wear behavior of the specimens, boronized at different temperatures and treatment durations, were examined. The fixed ball micro-abrasion tests were carried out using the abrasive slurry, prepared with different SiC powder particle sizes on the boronized specimens at different rotational speeds. The specimens boronized with nanoboron powders exhibited a higher hardness and abrasive wear resistance than the samples boronized with the Ekabor 3 powders.
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    Recycling of metallurgical wastes in ceramics: A sustainable approach
    (Elsevier Sci Ltd, 2022) Er, Yusuf; Sutcu, Mucahit; Gencel, Osman; Totic, Ermedin; Erdogmus, Ertugrul; Cay, Vedat Veli; Munir, Muhammad Junaid
    This pioneering study focuses on the production, testing, and comparative assessment of iron-rich metallurgical wastes, including copper slag (CS), rolling mill scale (RMS), and ferrous-metal grinding dust (FGD), incorporated fired clay bricks. For this purpose, the fired clay bricks incorporating CS, FGD, and RMS are prepared considering three different dosages of wastes (i.e., 10 %, 20 %, and 30 % of the weight of clay) and fired at two different temperatures (i.e., 900 degrees C and 1000 degrees C). Various tests were performed to examine different physical, mechanical, durability, and leaching characteristics of bricks. Results show increased porosity and loss-on-ignition of brick samples with increased CS dosage. However, decreased apparent porosity and loss-on-ignition of brick samples are observed with the increased dosages of RMS and FGD. All the brick samples incorporating metallurgical wastes satisfy the compressive strength and water absorption requirements as per ASTM C62 and other building standards. Scanning electron microscopy shows homogeneous and dense microstructures for brick samples incorporating 30 % RMS and FGD dosages. For all the brick samples fired at 1000 degrees C, amounts of heavy metals in the leachates are detected well below the Environmental Protection Agency specified limits. Based on the results, recycling of CS, RMS, and FGD in brick manufacturing is an attractive solution to avoid environmental issues related to landfilling of hazardous wastes and achieve efficient waste management.