Nitriding + PVD or CVD 22 3.5. Single-Stage and Double-Stage Nitriding 3. ... • 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 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. Gas nitriding is a thermo-chemical process of steel surface hardening. Nitrogen supply 25 4.2 Hydrogen supply 26 4.4. Plasma Nitriding, also referred to as ion nitriding, is a diffusion process that improves the wear resistance and fatigue properties of the product being nitrided. After World War II the plasma nitriding process received widespread acceptance in Germany, Russia, China and Japan. The most efficient and well-known methods of these treatments are plasma and gas nitriding or nitrocarburizing. Liquid Nitriding. Most commonly, the term nitriding refers to steel heated in ammonia gas. Although Gas Nitriding provides great wear and fatigue resistance for gears, the brittle white layer, if not removed will chip off and cause surface damage during operation. 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. High-speed gas injection replaces ventilator 23 4. Nitrocarburising gas supply set up 27 AIHT is uniquely capable of gas nitriding stainless steel! The second challenge with stainless steels is the high amount of Chromium. Fry then investigated the effects of alloying elements on surface hard-ness. UltraGlow® Gas Nitriding is a case-hardening process whereby nitrogen is diffused into the surface of a solid ferrous alloy by holding the metal at a suitable temperature in contact with a nitrogenous gas, usually ammonia. Gas Nitriding. Plasma nitriding. For applications that need the white layer removed, Plasma Nitriding should be considered. 3.3. Typical feature of plasma nitriding is the active participation of the treated parts in the glow discharge - the parts act as a cathode, while the chamber acts as an anode. For gas nitriding, our Ohio facility is well located for Midwest manufacturers, offering one of the largest nitriding departments in the country. Pack nitriding is not a reliable and reproducible process, whereas gas and liquid nitriding are not environmentally friendly, and tend to produce thick and brittle compound layers. Gas nitriding is arguably the more versatile case hardening option. Gas-Nitriding: Gas nitriding is the most commonly used nitriding method. Nitriding gas supply set up 26 4.5. As with carburising, nitriding can be carried out in any of the four states of matter (solid, liquid, gas and plasma). The Gas Nitriding Process. Plasma nitriding can also clean the surface by sputtering. Plasma Nitriding has many advantages over traditional Gas Nitriding process. Plasma nitriding is a similar process to plasma carburising, but with the use of a nitrogen-hydrogen gas mixture rather than a hydrocarbon to produce the glow discharge plasma. We perform advanced case hardening on a wide variety of steels. It has ceramic character, reduces wear and has moderate anticorrosive qualities. 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. Gas Nitriding Gas nitriding is a case-hardening process whereby nitrogen is introduced into the surface of a solid ferrous alloy by holding the metal at a suitable temperature in contact with a nitrogenous gas, usually ammonia. For a comparison of the two processes choose the Plasma vs. Gas option from the menu. Plasma ION nitriding is an industrial surface hardening treatment for iron-based materials. It occurs around 510°C. Ionitriding (Plasma), or Glow-Discharge Nitriding 4. This process is most useful for components such as Crankshafts, Gears and a multitude of other parts in tough environments (especially oil & gas, energy, aerospace, etc). 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. It is the most technically superior of all nitriding processes and has many advantages compared to traditional salt bath and gas nitriding. There are a huge variety of materials that this process can be applied to. 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 [24]). 1. In the controlled gas nitriding and plasma nitriding the more nitrogen poor but relatively ductile Fe4N, also termed γ‘-nitride, is formed. Vacuum, high pressure, and plasma nitriding 21 3.4. For instance, although both processes occur at high temperatures, plasma nitriding does not require the use of a blast furnace. Plasma Nitriding. The plasma nitriding process began in the 1920's as an alternative to conventional gas nitriding. With gas nitriding, by virtue of its being held in a gaseous state, there are very few process contaminants to worry about. Salt bath nitriding / liquid nitriding is a subcritical surface enhancement process holding the longest track record of success over any case hardening technology. In gas nitriding, the workpiece is treated in a stream of ammonia gas between 480 and 550 °C. Plasma nitriding, also known as ion nitriding, plasma ion nitriding or glow-discharge nitriding, is an industrial surface hardening treatment for metallic materials. 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