Plasma nitriding offers a number of advantages over conventional nitriding conducted with the assistance of ammonia gas. For instance, although both processes occur at high temperatures, plasma nitriding does not require the use of a blast furnace. After World War II the plasma nitriding process received widespread acceptance in Germany, Russia, China and Japan. The process is performed in shaft and hood-type furnaces within a temperature range between 500°C and 600°C. Plasma nitriding can also clean the surface by sputtering. Plasma ION nitriding is an industrial surface hardening treatment for iron-based materials. He discovered that the nitriding process produced a high surface hardness only on steels containing chromium, molybdenum, aluminum, 4/Practical Nitriding and Ferritic Nitrocarburizing Plasma nitriding and plasma nitrocarburising are often preferred to the corresponding gas processes if masking is required. During gas nitriding, steel is heated to a temperature between 500°C and 580°C in the ammonia atmosphere. 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. After World War II the plasma nitriding process received widespread acceptance in Germany, Russia, China and Japan. The Gas Nitriding Process. The second challenge with stainless steels is the high amount of Chromium. 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. 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. The Gas Nitriding Process. Nitriding + PVD or CVD 22 3.5. It is the most technically superior of all nitriding processes and has many advantages compared to traditional salt bath and gas nitriding. At Metal Plasma Technology (MPT) in Valencia California, we are experts in plasma ion nitriding. Gas nitriding is only applied, as a rule, for alloyed steels. Despite the name, the process is really a modified form of nitriding with carbon added. 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. High-speed gas injection replaces ventilator 23 4. Nitriding vs. Nitrocarburizing. If the die had been gas nitrided for the same duration as in ion nitriding, the case depth would be lower and … Atmosphere generation, gas supply. As with carburising, nitriding can be carried out in any of the four states of matter (solid, liquid, gas and plasma). It occurs around 510°C. The plasma nitriding process began in the 1920's as an alternative to conventional gas nitriding. In gas nitriding, the workpiece is treated in a stream of ammonia gas between 480 and 550 °C. 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]). By adding carbon to the workpiece surface, the process of … Therefore, gas nitriding is preferred when processing high-volume case hardening runs. Nitriding gas supply set up 26 4.5. 3.3. Fry then investigated the effects of alloying elements on surface hard-ness. Engineers considering the advantages and disadvantages of surface treatments typically have a usable lifespan, surface hardness, and fatigue strength in mind. 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. 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. The process was developed in the 1920's as an alternative to the gas nitriding process. In the original method, components are heated at about […] 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. Plasma nitriding. There are a huge variety of materials that this process can be applied to. The more nitrogen rich, harder and better corrosion resistant Fe₂₋₃N-VS, … ... • 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 Gas-Nitriding 2. Ionitriding (Plasma), or Glow-Discharge Nitriding 4. Nitrogen supply 25 4.2 Hydrogen supply 26 4.4. The Nitriding process is an established and successful means of generating a hard case on a component. Method # 1. For gas nitriding, our Ohio facility is well located for Midwest manufacturers, offering one of the largest nitriding departments in the country. 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. The methods are:- 1. 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. The white layer produced in Plasma Nitriding is ductile/crack resistant. Salt bath nitriding / liquid nitriding is a subcritical surface enhancement process holding the longest track record of success over any case hardening technology. 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. Nitriding: Using Plasma Vs Gas. Plasma Nitriding. Heat treatment is the use of heat to modify the properties of a material, especially in metallurgy.Heat treatment is done via heating and cooling of substances. During gas nitriding, nitrogen is provided in the form of ammonia gas. Gas nitriding is a thermo-chemical process of steel surface hardening. Plasma ION nitriding is an industrial surface hardening treatment for iron-based materials. Plasma nitriding. The plasma nitriding process began in the 1920's as an alternative to conventional gas nitriding. Nitriding is another low-temperature process where nitrogen is transferred and taken up by the steel. Main Difference – Carburizing vs Nitriding. Gas-Nitriding: Gas nitriding is the most commonly used nitriding method. Gas Nitriding. 24 4.1. Surface hardening thermochemical heat treatment through nitrogen diffusion. 1. 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. In the controlled gas nitriding and plasma nitriding the more nitrogen poor but relatively ductile Fe4N, also termed γ‘-nitride, is formed. It is widely used to enhance the performance of titanium, chromium, and aluminum alloyed … The most efficient and well-known methods of these treatments are plasma and gas nitriding or nitrocarburizing. ADVERTISEMENTS: The following points highlights the four main methods used for nitriding of steels. Nitrocarburising gas supply set up 27 This process supports the aerospace, defense, power generation, oil, gas, automotive, medical, and commercial industries. In plasma nitriding, the reactivity of the nitriding media is not due to the temperature but to the gas ionized state. Plasma Nitriding has many advantages over traditional Gas Nitriding process. Plasma Nitriding is often combined with Black Oxide to provide added corrosion protection. It has ceramic character, reduces wear and has moderate anticorrosive qualities. There are many advantages of this method over conventional gas nitriding: • Cost effectiveness - 3 … 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). 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%. Plasma nitriding, also known as ion nitriding, plasma ion nitriding or glow-discharge nitriding, is an industrial surface hardening treatment for metallic materials. 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. Quenching is not required for the production of a hard case. 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. For a comparison of the two processes choose the Plasma vs. Gas option from the menu. This specialty process improves on the more commonly used salt-bath (liquid) nitriding method by offering deeper case depths and higher quality case hardening. 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. Single-Stage and Double-Stage Nitriding 3. It is the most technically superior of all nitriding processes and has many advantages compared to traditional salt bath and gas nitriding. Thus was developed the single-stage gas nitriding process as it is known today. AIHT is uniquely capable of gas nitriding stainless steel! 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