Content deleted Content added
→Uses: minor |
Rescuing 2 sources and tagging 0 as dead.) #IABot (v2.0.9.5 |
||
(46 intermediate revisions by 32 users not shown) | |||
Line 1:
{{Short description|Type of hardening with nitrogen and carbon using a salt bath}}
{{distinguish|Carbonitriding}}
'''Ferritic nitrocarburizing''' or '''FNC''', also known by the proprietary names '''
The process is used to improve three main [[surface integrity]] aspects including scuffing resistance, [[fatigue (material)|fatigue]] properties, and [[corrosion resistance]]. It has the added advantage of inducing little shape distortion during the hardening process. This is because of the low processing temperature, which reduces thermal shocks and avoids [[phase transition]]s in steel.<ref>{{Harvnb|Pye|2003|pp=193–194}}.</ref>
==History==
The first ferritic nitrocarburizing methods were done at low temperatures, around {{convert|550|C|abbr=on}}, in a liquid salt bath. The first company to successfully commercialize the process was the [[Imperial Chemical Industries]] in [[Great Britain]]. ICI called their process "the cassel" due to the plant where it was developed
Because of the cleaning issues,
This spurred the development of a more environmentally friendly salt bath process by the German company [[Degussa]] after acquiring ICI patents.<ref>{{cite web|title=To find the way in the nomenclature
==Processes==
Despite the naming, the process is a modified form of [[nitriding]] and not [[carburizing]]. The shared
===Salt bath ferritic nitrocarburizing===
Salt bath ferritic nitrocarburizing is also known as '''liquid ferritic nitrocarburizing''' or '''liquid nitrocarburizing'''<ref name="easterday">{{Citation |last=Easterday |first=James R. |title=Liquid Ferritic Nitrocarburizing |url= http://domino-69.prominic.net/A55B6F/nitromet/nitromet.nsf/a615da0219b54b79852571cb006bc9d2/d5e108115987d71c862572bc007000f7/$FILE/Nitromet%20Liquid%20Ferritic%20Nitrocarburizing.pdf |
The simplest form of this process is encompassed by the trademarked '''Melonite''' process, also known as '''Meli 1'''. It is most commonly used on steels, [[sintering|sintered]] irons, and [[cast iron]]s to lower [[friction]] and improve [[wear resistance|wear]] and corrosion resistance.<ref name="pye203">{{Harvnb|Pye|2003|p=203}}.</ref><ref>{{Citation|title = Melonite Processing |url = http://www.burlingtoneng.com/melonite.html |
The process uses a salt bath of [[alkali]] [[cyanate]]. This is contained in a steel pot that has an [[aeration]] system. The cyanate thermally reacts with the surface of the workpiece to form an alkali [[carbonate]]. The bath is then treated to convert the carbonate back to a cyanate. The surface formed from the reaction has a compound layer and a diffusion layer. The compound layer consists of iron, nitrogen, and oxygen
A similar process is the trademarked '''Nu-Tride''' process, also known incorrectly as the '''Kolene''' process (which is actually the company's name), which includes a preheat and an intermediate quench cycle. The intermediate quench is an [[Oxidizing agent|oxidizing]] salt bath at {{convert|400|C|abbr=on}}. This quench is held for 5 to 20 minutes before the final quenching to room temperature. This is done to minimize distortion and to destroy any lingering cyanates or cyanides left on the workpiece.<ref>{{Harvnb|Pye|2003|pp=208–210}}.</ref>
Other trademarked processes are '''Sursulf''' and '''Tenoplus'''. Sursulf has a sulfur compound in the salt bath to create surface sulfides which creates [[porosity]] in the workpiece surface. This porosity is used to contain lubrication. Tenoplus is a two-stage high-temperature process. The first stage occurs at {{convert|625|C|abbr=on}}, while the second stage occurs at {{convert|580|C|abbr=on}}.<ref>{{Harvnb|Pye|2003|p=217}}.</ref>
===Gaseous ferritic nitrocarburizing===
Gaseous ferritic nitrocarburizing is also known as '''controlled nitrocarburizing''', '''soft nitriding''', and '''vacuum nitrocarburizing''' or by the tradenames '''UltraOx''',<ref>{{cite web |title=UltraOx |url= https://www.ahtcorp.com/services/nitriding-and-nitrocarburizing/ultraox/ |website=ahtcorp.com |access-date=16 January 2023}}</ref> '''Nitrotec''', '''Nitemper''', '''Deganit''', '''Triniding''', '''Corr-I-Dur''', '''Nitroc''', '''NITREG-C''',<ref>{{Cite web |title=NITROCARBURIZING NITREG®-C – Nitrex |url=https://www.nitrex.com/en/solutions/furnaces-technologies/nitriding-nitrocarburizing/nitreg-technologies/nitrocarburizing-nitreg-c/ |access-date=2023-02-22 |website=www.nitrex.com/en/ |language=en-US}}</ref>
The parts are first cleaned, usually with a [[vapor degreasing]] process, and then nitrocarburized around {{convert|570|C|abbr=on}}, with a
===Plasma-assisted ferritic nitrocarburizing===
Plasma-assisted ferritic nitrocarburizing is also known as '''ion nitriding''', '''plasma ion nitriding''', or '''glow-discharge nitriding'''. The process works to achieve the same result as the salt bath and gaseous process, except the reactivity of the media is not due to the temperature but to the gas ionized state.<ref>{{Harvnb|Pye|2003|p=71}}.</ref><ref>
===
An additional step can be added to the nitrocarburizing process called
This combination of nitrocarburizing and oxidizing is sometimes called "nitrox", but this word also has [[nitrox|another meaning]].<ref>For references, see in [[wikt:nitrox]].</ref>
==Uses==
These processes are most commonly used on low-carbon, low-alloy steels, however, they are also used on medium and high-carbon steels. Common applications include [[spindle (tool)|spindles]], [[Cam (mechanism)|cam]]s, [[gear]]s, [[die (manufacturing)|dies]], [[hydraulic
One of the initial applications of the hardening process for mass-produced automobile engines was by [[Kaiser-Jeep]] for the [[crankshaft]] in the 1962 [[Jeep Tornado engine]].<ref>{{cite web |last1=Allen |first1=Jim |title=Classic Engine: Jeep's Tornado Straight-Six |url= https://www.cars.com/articles/classic-engine-jeeps-tornado-straight-six-454372/ |website=cars.com |date=30 October 2018 |access-date=16 January 2023}}</ref> This was one of many innovations in the OHC six-cylinder engine. The crankshaft was strengthened by Tufftriding in a special salt bath for two hours at {{convert|1025|F|C}} which, according to Kaiser-Jeep, increased engine life by 50% and also made the journal surfaces hard enough to be compatible with heavy duty tri-metal engine bearings.<ref>{{cite web|url= http://www.ifsja.org/tech/motors/tornado.html |title=Tornado 230 CI Engine Information / History |first=Ben |last=Page |work=The International Full Size Jeep Association |date=2006 |access-date=16 January 2023}}</ref>
[[Glock Ges.m.b.H.]], an [[Austria]]n firearms manufacturer, utilized the Tenifer process until 2010, to protect the barrels and slides of the [[pistols]] they manufacture. The finish on a [[Glock pistol]] is the third and final hardening process. It is {{convert|0.05|mm|in|abbr=on}} thick and produces a 64 [[Rockwell scale|Rockwell C hardness rating]] via a {{convert|500|C|F}} nitride bath.<ref>{{cite book | last=Kasler | first=Peter Alan |pages=136-137 | title=Glock: The New Wave in Combat Handguns | year=1992 | publisher=Paladin Press |location=Boulder, Col. | isbn=9780873646499 | oclc=26280979}}</ref> The final matte, non-glare finish meets or exceeds [[stainless steel]] specifications, is 85% more corrosion resistant than a hard [[Chrome plating|chrome]] finish, and is 99.9% salt-water corrosion resistant.<ref>{{cite book | last=Kokalis | first=Peter |pages=321 | title=Weapons Tests and Evaluations: The Best of Soldier of Fortune | year=2001 | publisher=Paladin Press |location=Boulder, Col. | isbn=9781581601220}}</ref> After the Tenifer process, a black [[Parkerizing|Parkerized]] finish is applied and the slide is protected even if the finish were to wear off. In 2010 Glock switched to a gaseous ferritic nitrocarburizing process.<ref name="MetalTreatments">{{cite web|url=http://firearmshistory.blogspot.com/2010/08/metal-treatments-ferritic.html|title=Firearms History, Technology & Development|author=The Editor|publisher=|accessdate=25 December 2014}}</ref> Besides Glock several other pistol manufacturers, including [[Smith & Wesson]] and [[HS2000|Springfield Armory, Inc.]], also use ferritic nitrocarburizing for finishing parts like barrels and slides but they call it Melonite finish. [[Heckler & Koch]] use a nitrocarburizing process they refer to as Hostile Environment. Pistol manufacturer [[Caracal pistol|Caracal International L.L.C.]] uses ferritic nitrocarburizing for finishing parts such as barrels and slides with the plasma-based post oxidation process (PlasOx).▼
[[File:Glock 17 (6825676904) без фона.jpg|thumb|A first-generation Glock 17 adopted in 1985 by the Norwegian Armed Forces under the P80 designation]]
▲[[Glock Ges.m.b.H.]], an [[Austria]]n firearms manufacturer, utilized the Tenifer process until 2010, to protect the barrels and slides of the [[pistols]] they manufacture. The finish on a [[Glock pistol]] is the third and final hardening process. It is {{convert|0.05|mm|in|abbr=on}} thick and produces a 64 [[Rockwell scale|Rockwell C hardness rating]] via a {{convert|500|C|F}} nitride bath.<ref>{{cite book | last=Kasler | first=Peter Alan |pages=
==References==
Line 48 ⟶ 54:
===Bibliography===
*{{Citation|last = Pye|first = David|title = Practical nitriding and ferritic nitrocarburizing|publisher = ASM International |year
*{{cite web|last1=Pye|first1=David|title=About David Pye|url= http://pye-d.com/david-pye.php |website=
*{{cite web|last1=Pye|first1=David|title=Books By David Pye|url= http://pye-d.com/heat-treatment-books-by-david-pye.php |website=
*{{Citation|url=https://books.google.com/books?id=Lt7WBiILHpYC&pg=PA115
==External links==
*[http://www.durferrit.de/media/pdf/Tenifer_QPQ_eng.pdf Tufftride-/QPQ-process: technical information]
*[http://www.keighleylabs.co.uk/heat-treatment-html/tufftride-ferritic-nitrocarburizing/ : What is Tufftride?]
{{Iron and steel production}}
{{DEFAULTSORT:Ferritic Nitrocarburizing}}
|