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KOHIMA, May 30: Seminar on Radical Nitriding process for improving the life of cutting tools for agriculture was organized by Nagaland Science and Technology Council (NSTC). The seminar was held at Nagaland Science and Technology Complex, Kohima on Tuesday.
Resource person SG, Facilitation Center for Industrial Plasma Technologies (FCIPT), Institute of Plasma Research (IPR), Gandhinagar, Gujarat, Er. Dr. Alphonso Joseph, gave a powerpoint presentation on plasma nitriding system pointing that it is one of the best tools for farmer as it is more durable than other tools. She said that the plasma nitriding system is a heat treating process which diffuses nitrogen into the surface of a metal to create a case-hardened surface.
These processes are most commonly used on low-carbon, low-alloy steels but on medium and high-carbon steels, titanium, aluminum and molybdenum. In plasma nitriding, the reactivity of the nitriding media is not due to the temperature but the ionized state of gas. In this technique intense electric fields are used to generate ionized molecules of the gas around the surface to be nitrided. Such highly active gas with ionized molecules is called plasma. The gas used for plasma nitriding is usually pure nitrogen, since no spontaneous decomposition is needed (as is the case of gas nitriding with ammonia). There are hot plasmas typified by plasma jets used for metal cutting, welding, cladding or spraying. There are also cold plasmas, usually generated inside vacuum chambers, at low pressure regimes.
Usually steels are beneficially treated with plasma nitriding. This process permits the close control of the nitrided microstructure, allowing nitriding with or without compound layer formation. Not only the performance of metal parts is enhanced, but working lifespans also increase, and so do the strain limit and the fatigue strength of the metals being treated. For instance, mechanical properties of austenitic stainless steel like resistance to wear can be significantly augmented and the surface hardness of tool steels can be doubled. This tools like Satellite and Textile Company etc are made through plasma nitriding system, the resource person said.