نوع مقاله : مقاله پژوهشی
نویسندگان
گروه مهندسی مواد، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Introduction and Objectives: ZrB2-SiC composites are used in various fields such as aerospace industry and aviation due to their prominent properties, including high melting points. The aim of this research is to investigate the effect of adding zirconium carbide on the oxidation resistance of the composite at 1400 °C.
Materials and Methods: In this research, in order to investigate the effect of the amount of zirconium carbide on the oxidation resistance of ZrB2-SiC composite, three composites containing 4, 8, and 12 vol.% zirconium carbide were sintered at 1800 °C for 9 min under pressure of 30 MPa using the spark plasma sintering (SPS) method. The oxidation test was performed by placing the samples in a box furnace at 1400 °C for 1, 2, 3, 5, 6, 7, 10, 15, and 18 h in air atmosphere. Weight changes were measured and recorded before and after the oxidation test to evaluate the oxidation resistance of the samples. The microstructural examinations and chemical composition analysis were performed using a field emission scanning electron microscope equipped with an energy-dispersive X-ray spectroscopy system.
Results: It was found that the presence of zirconium carbide decreases the oxidation resistance. In addition, the graph of weight changes revealed that the oxidation mechanism of the composites was controlled by diffusion and followed a parabolic trend.
Conclusion: It was concluded that the rate of oxygen diffusion is the key and main parameter in the oxidation of this composite during the oxidation process.
کلیدواژهها [English]