Comparison of Al2O3, TiO2, and Carbon as Nanoparticles in Water-Based Nanofluids with Sodium Dodecyl Benzene Sulfonate (SDBS) Surfactant for Quenching Medium

F A Syauqi, W Putra

Abstract

Abstract—The application of quench medium for certain purposes in industries may define the hardness of a material after heat treatment. Selecting a good quench medium is necessary to ensure the quality of rapid cooling. Nanofluids may be used to increase the thermal conductivity for quench medium to obtain a desired microstructure and hardness of materials. Nanofluids contain suspended nanoparticles with an average size of 100 nm in a fluid base such as water to achieve better heat absorption and heat transfer through particles. Particles from commercial-grade Al2O3, TiO2, and carbon were used as-mentioned because of their high thermal conductivity. Most of these particles must be prepared with an ultrasonic stirrer which becomes unstable after a long time. The addition of surfactant helps the particles and the fluid to suspend. Thus, the surfaces were modified. Sodium dodecyl benzene sulfonate (1%, 3%, and 5%) as a surfactant in commercial household body care was used in this research with 100 ml nanofluids and 0.5% nanoparticles. The nanoparticles were milled at 500 rpm for 10 h, and the initial particle size was obtained by a scanning electron microscope. An S45C medium carbon steel, which was heated at 1000 °C for 1 h, was used in this research. The hardness and microstructure of the steel samples were observed after quenching.

Keywords—Nanofluids; Quench Medium; Heat Treatment; Surfactant; Hardness

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