Atmosphere generation, gas supply. 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. The plasma nitriding process began in the 1920's as an alternative to conventional gas nitriding. Ionitriding (Plasma), or Glow-Discharge Nitriding 4. Plasma ION nitriding is an industrial surface hardening treatment for iron-based materials. The Gas Nitriding Process. 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. Nitriding vs. Nitrocarburizing. 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. Gas-Nitriding 2. Nitrogen supply 25 4.2 Hydrogen supply 26 4.4. Plasma nitriding and plasma nitrocarburising are often preferred to the corresponding gas processes if masking is required. Most commonly, the term nitriding refers to steel heated in ammonia gas. During gas nitriding, nitrogen is provided in the form of ammonia gas. Plasma nitriding, also known as ion nitriding, plasma ion nitriding or glow-discharge nitriding, is an industrial surface hardening treatment for metallic materials. 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. By adding carbon to the workpiece surface, the process of … It occurs around 510°C. Fry then investigated the effects of alloying elements on surface hard-ness. Plasma Nitriding has many advantages over traditional Gas Nitriding process. Salt bath nitriding / liquid nitriding is a subcritical surface enhancement process holding the longest track record of success over any case hardening technology. The Nitriding process is an established and successful means of generating a hard case on a component. If the die had been gas nitrided for the same duration as in ion nitriding, the case depth would be lower and … Gas Nitriding. Nitriding provides only nitrogen to the surface of the work piece, and is normally accomplished in gas or plasma atmospheres, using much longer cycles to achieve deep diffusion depth. 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. It has ceramic character, reduces wear and has moderate anticorrosive qualities. 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. With gas nitriding, by virtue of its being held in a gaseous state, there are very few process contaminants to worry about. The most efficient and well-known methods of these treatments are plasma and gas nitriding or nitrocarburizing. We perform advanced case hardening on a wide variety of steels. The process is performed in shaft and hood-type furnaces within a temperature range between 500°C and 600°C. Gas nitriding is only applied, as a rule, for alloyed steels. The second challenge with stainless steels is the high amount of Chromium. Plasma nitriding can also clean the surface by sputtering. 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). It is widely used to enhance the performance of titanium, chromium, and aluminum alloyed … The plasma nitriding process began in the 1920's as an alternative to conventional gas nitriding. 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. Vacuum, high pressure, and plasma nitriding 21 3.4. Main Difference – Carburizing vs Nitriding. Plasma nitriding. Engineers considering the advantages and disadvantages of surface treatments typically have a usable lifespan, surface hardness, and fatigue strength in mind. Gas-Nitriding: Gas nitriding is the most commonly used nitriding method. There are many advantages of this method over conventional gas nitriding: • Cost effectiveness - 3 … Nitriding gas supply set up 26 4.5. 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. 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. 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. Thus was developed the single-stage gas nitriding process as it is known today. 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. He discovered that the nitriding process produced a high surface hardness only on steels containing chromium, molybdenum, aluminum, 4/Practical Nitriding and Ferritic Nitrocarburizing The white layer produced in Plasma Nitriding is ductile/crack resistant. The Gas Nitriding Process. Liquid Nitriding. In the original method, components are heated at about […] 3.3. As with carburising, nitriding can be carried out in any of the four states of matter (solid, liquid, gas and plasma). The process was developed in the 1920's as an alternative to the gas nitriding process. After World War II the plasma nitriding process received widespread acceptance in Germany, Russia, China and Japan. 1. AIHT is uniquely capable of gas nitriding stainless steel! It is the most technically superior of all nitriding processes and has many advantages compared to traditional salt bath and gas nitriding. Method # 1. For applications that need the white layer removed, Plasma Nitriding should be considered. It is the most technically superior of all nitriding processes and has many advantages compared to traditional salt bath and gas nitriding. Gas nitriding is a thermo-chemical process of steel surface hardening. For instance, although both processes occur at high temperatures, plasma nitriding does not require the use of a blast furnace. Plasma nitriding. Plasma Nitriding. Surface hardening thermochemical heat treatment through nitrogen diffusion. 24 4.1. Gas nitriding is arguably the more versatile case hardening option. Plasma nitriding is suitable for all ferrous materials, even sintered steels with higher porosity, cast iron and high alloyed tool steels even with chromium contents higher than 12%. There is a layer of nitrides formed on the surface. Single-Stage and Double-Stage Nitriding 3. Plasma Nitriding is often combined with Black Oxide to provide added corrosion protection. In plasma nitriding, the reactivity of the nitriding media is not due to the temperature but to the gas ionized state. This specialty process improves on the more commonly used salt-bath (liquid) nitriding method by offering deeper case depths and higher quality case hardening. 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