Traditional nitriding … Plasma nitriding offers the following advantages over gas nitriding: No harmful ingredients like ammonia are used; only non-toxic gases contained in the air. Chengdu Surface Metal Technology Co., Ltd is a professional manufacturer and exporter of QPQ liquid nitriding, salt bath nitriding &end products. Nitriding also produces extended fatigue life and improves corrosion resistance. Those processes are strong in different circumstances, but plasma nitriding is nontoxic, flexible, and precise. Salt bath nitriding. Thus, when greater-depth than that can be obtainable with salt-bath nitriding is required, gas-nitriding … There are three typical ways of nitriding, salt bath nitriding [8], gas nitriding [9] and plasma nitriding [2,10]. September 27th, 2010 Salt-Bath Nitriding for Barrels — Whidden is Impressed. MECHANISM OF NITRIDING NITRIDING. Plasma nitriding imparts a hard wear resistant surface without brittleness, galling, or spalling. A fine-turned or ground surface finish is best. The purpose of this study is to investigate nitriding be-havior of IF steel in the KNO 3 salt-bath, with emphasis on solid-solution hardening and nitriding kinetics. Salt bath nitriding. Salt bath and gas nitriding, which uses ammonia (NH3) and phosphate for activa- tion , will roughen a ground or polished surface. Only one process possible with a particular salt type - since the nitrogen potential is set by the salt, only one type of process is possible, All round nitriding effect (can be a disadvantage in some cases, compared with plasma nitriding), Large batch sizes possible - the limiting factor being furnace size and gas flow, With modern computer control of the atmosphere the nitriding results can be tightly controlled, Relatively cheap equipment cost - especially compared with plasma, Reaction kinetics heavily influenced by surface condition - an oily surface or one contaminated with cutting fluids for example will deliver poor results, Surface activation is sometimes required to successfully treat steels with a high chromium content - compare sputtering during plasma nitriding, Ammonia as nitriding medium - though not especially toxic it can be harmful when inhaled in large quantities. 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. 580°C, resulting in increased hardness. Tools and small components are often liquid-nitrided. There are several different nitriding processes such as gas, plasma, and salt bath nitriding. Not all salt bath nitriding processes are QPQ. A uniform glow discharge that envelops the entire surface achieves a consis- tent hardness and case depth. Controlled Liquid Ionic Nitriding Overview. MEHANISM OF NITRIDING gas nitriding . Salt bath nitriding —also known as ferritic nitrocarburizing (FNC)— is one of the most popular ways to achieve these results, but it isn’t the only way. Also, care must be taken when heating in the presence of oxygen to reduce the risk of explosion. No toxic waste gas is generated; nothing has to be subsequently combusted. The following table lists the typical properties produced by CST’s standard Ni-Surf process. This eliminates costly cleaning or grinding to remove the brittle white layer associated with traditional nitriding. It is predominantly used on steel, but also titanium, aluminum and molybdenum. Minimal amounts of material should be removed post nitriding to preserve the surface hardness. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Parts up to 57 in. A more modern development of the nitriding process, also known as ion nitriding.In this process the component is made cathodic in relation to the furnace shell and ammonia gas is fed into the evacuated chamber. Also, salt bath nitriding is not the same as ferritic nitrocarburizing. The processes are named after the medium used to donate. Plasma nitriding imparts a hard wear resistant diffused layer to the surface without the problems encountered with most wet bath platings. Plasma nitriding. Salt bath and gas nitriding, which uses ammonia (NH3) and phosphate for activa- tion , will roughen a ground or polished surface. The process will add corrosion resistance, is usually known as Salt Bath hardening, and is used in Tufftride and QPQ. Process Overview In a liquid nitriding bath, which is maintained between 500 - 630°C (930 - 1165°F), nitrogen-bearing salts produce a controlled and highly uniform release of nitrogen at the surface of the workpiece. Plasma nitriding (H2+N2) least affects the surface finish of the product. Typical applications include gears, crankshafts, camshafts, cam followers, valve parts, extruder screws, die-casting tools, forging dies, extrusion dies, injectors and plastic-mold tools. The advantages of gas nitriding over the other variants are: Plasma nitriding, also known as ion nitriding, plasma ion nitriding or glow-discharge nitriding, is an industrial surface hardening treatment for metallic materials. The salts used also donate carbon to the workpiece surface making salt bath a … The processes are named after the medium used to donate nitrogen. The advantages of gaseous nitriding processes can be surpassed by plasma nitriding. Especially when you're dealing with iron-based materials or … All machining, stress relieving, as well as hardening and tempering are normally carried out before nitriding. Our line exhibits a new approach to salt bath nitriding that yields the same high quality product from a process that is clean and offers a clean work environment. The advantages and disadvantages of these techniques are similar to those of carburizing. salt bath nitrocarburizing Salt bath nitrocarburizing involves immersing the tools to be treated in molten salt, which releases nitrogen and carbon onto the component surface at a temperature of approx. The term nitrocarburization refers to steel treated in salt or exogas. There are three typical ways of nitriding, salt bath nitriding [8], gas nitriding [9] and plasma nitriding [2,10]. 2. The heat requirements for liquid are lower than for the gas technique, and the hardened compound on the surface of the component is thicker. Plasma Nitriding We offer the widest range of Plasma Nitriding and Plasma Nitrocarburising facilities available in the UK. In salt bath nitriding, the component(s) are placed in a molten salt bath and the entire component it heated to get a hard nitride layer on the surface. In plasma nitriding processes nitrogen gas (N2) is usually the nitrogen carrying gas. The properties of the resulting nitrided or nitrocarburised surface are in many cases independent of the production process. 12 – 17, July, 2004. A very high degree of control of the case depth and compound layer is achieved by this form of Nitriding. Corrosion resistance – which is greatly reduced by plasma nitriding – is largely retained with the new evochrome process. 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