IMPACT OF NATURAL NANOADDITIVES SiO2 AND TiO2 ON THE QUALITY OF MACHINING PROCESS FLUIDS AND BACTERICIDAL PROPERTIES

An understanding of machining process fluids (types, compositions, operational conditions, lubricating and cleaning effect) is important for maximizing machining process efficiency by reducing heat generation, improving surface roughness, stabilizing the machining process, and increasing the operating life. Contamination by bacteria or even fungi is the weak point of these liquids. The uninhibited growth of bacteria may lead to poor lubricating properties and higher material oxidization; moreover, the presence of endotoxins in a shop floor atmosphere is the consequence of bacterial activity. Thus, biocide chemicals are added to process fluids in order to prevent the bacterial growth. The biocides maintain the efficiency of the process fluids; however, they are injurious to the operators (potential carcinogenic compounds). Natural nanoadditives are a modern way of increasing the biocidal effects. Nanoadditives added to the process fluids have a positive effect on the machining process by reducing the friction coefficient resulting in a reduction of wear of the cutting tool. Nanoadditives can also enhance the bactericidal effect by reducing bacterial respiratory rates and viability.