For applications that need the white layer removed, Plasma Nitriding should be considered. Nitreg ® is a modern heat treating process, capable of meeting the metallurgical requirements of all nitriding specifications that may have been originally written for salt bath, plasma or traditional gas nitriding. Nitriding + PVD or CVD 22 3.5. Engineers considering the advantages and disadvantages of surface treatments typically have a usable lifespan, surface hardness, and fatigue strength in mind. The process of nitriding takes place in the plasma (electrically, conductive gas) in a vacuum stove at 350 to 600° C. The nitrogen from the nitriding material diffuses into the surface and causes a change of the chemical composition and the structure in the surface layer (see figure 70 ). The white layer produced in Plasma Nitriding is ductile/crack resistant. Plasma nitriding offers a number of advantages over conventional nitriding conducted with the assistance of ammonia gas. In gas nitriding, the workpiece is treated in a stream of ammonia gas between 480 and 550 °C. The most efficient and well-known methods of these treatments are plasma and gas nitriding or nitrocarburizing. Plasma Nitriding can be accomplished as low as 800°F and is the preferred Nitriding method for parts with high harnesses often seen in tool steels. Method # 1. ... • Gas and Plasma Nitriding: MAX - Ø mm 1.1600x11.000 h mm MAX - Ø 2.200x h 2.500 mm MAX - Ø mm 4.000x h 4.000 mm • Nipre®: MAX - Ø 1.000 x h 11.000 mm At Metal Plasma Technology (MPT) in Valencia California, we are experts in plasma ion nitriding. Plasma ION nitriding is an industrial surface hardening treatment for iron-based materials. In plasma nitriding, the reactivity of the nitriding media is not due to the temperature but to the gas ionized state. Nitrogen supply 25 4.2 Hydrogen supply 26 4.4. Gas Nitriding. This specialty process improves on the more commonly used salt-bath (liquid) nitriding method by offering deeper case depths and higher quality case hardening. Also, no separate heating is required as the plasma provides sufficient heating of the component's surface to reach the process temperature of typically 500°C. The gas nitriding process (also called “ammonia nitriding”) provides a way to case harden the surface of steel components, hardening them to better resist scratches, abrasions and scuffing while permitting the interior to remain soft. Most commonly, the term nitriding refers to steel heated in ammonia gas. The second challenge with stainless steels is the high amount of Chromium. In the original method, components are heated at about […] The process is performed in shaft and hood-type furnaces within a temperature range between 500°C and 600°C. As a process, both gas and ion (plasma) nitriding avoid the issues involved with coatings and achieve similar metallurgical properties, and the compound zone increases corrosion resistance. The Gas Nitriding Process. Due to the chemical decomposition of the ammonia at the component, the nitrogen diffuses into the surface and a diffusion and compound layer is formed. For instance, although both processes occur at high temperatures, plasma nitriding does not require the use of a blast furnace. Fry then investigated the effects of alloying elements on surface hard-ness. If the die had been gas nitrided for the same duration as in ion nitriding, the case depth would be lower and … Plasma nitriding. Thus was developed the single-stage gas nitriding process as it is known today. For a comparison of the two processes choose the Plasma vs. Gas option from the menu. During gas nitriding, steel is heated to a temperature between 500°C and 580°C in the ammonia atmosphere. 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