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Plasma (ION) Nitriding

ION Nitriding is the Most Advanced Case Hardening Technology Today. Nitriding in Pulse Glowing Discharge (Plasma Nitriding) is an Efficient Method to Increase Hardness and Wear Resistance of Metals & Alloys based Material. ION Nitriding has many Advantages Compare to Traditional Salt Bath & Gas Nitriding.

The ION Nitriding process is done in a vacuum vessel at low temperatures ( 400 oC - 560 oC ) where high voltage electrical charge forms plasma, causing nitrogen ions to accelerate and impinge on the metal. When the nitrogen ions bombard the part they heat up metal, clean the surface, and absorb nitrogen into the surface and can be applied to any ferrous material.

Advantages of Plasma Nitriding

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. There are many advantages of this method over conventional gas nitriding:

Cost effectiveness :

3 to 10 times reduced duration of treatment.
50% - 100 % less energy consumption
50 to 100 times less working gas consumption

Distortion - none or negligible distortions, because ion nitriding is performed at lower temperature and under vacuum
Higher surface, case and core hardness
Excellent wear resistance - the ion nitriding process produces a compound zone which is dense, nonporous, very hard, not brittle, and has a low coefficient of friction
Reproducible results and better control - the technological process of ion nitriding is fully automated and computer controlled. The parts are heated by the ion bombardment on their surface and therefore the parts are heated uniformly
Surface finish - due to minimum deformations no additional mechanical treatments are necessary
Necessity of predepassivation of stainless steel is eliminated
Masking - surfaces which require masking are easily masked with reusable mechanical masking devices or special paint for masking - 100 % effective
Excellent hygiene and working conditions - the process is not toxic and corresponds to all modern requirements for environmental control.

Industries in which Plasma Nitriding is Implemented

Many parts and tools of all industries are subject to plasma nitriding and nitrocarburising. Different examples demonstrate how plasma nitriding and nitrocarburising solve tough tasks.

Here are some examples of industries where plasma nitriding and nitrocarburising are applied:

Automobile Industry - crankshafts, camshafts, gears, pistons, cylinders, valves, valve springs, synchromesh rings
Metal Casting and Moulding Industries - moulds for non-ferrous metals and alloys
Forging Industry - all kinds of dies for hammering and pressing (cold forging, impression forging, open die forging)
Aluminium Industry - dies for casting and extruding
Plastics Industry - extruder screws, cylinders, moulds for injection moulding
Machine Building - shafts, spindles, slide-rails, instruments for cold and hot rolling, dies and punches for deep drawing, pump cylinders, milling and drilling tools (milling cutters, rams, drills, taps, broaches, etc.)
Powder Metallurgy - gears, bushes, synchromesh rings
Power Engineering - turbines, shafts, spindles, gears

Suitable Materials

High alloy steel containing chromium, molybdenum, Aluminium, tungsten and C vanadium Eg. 4140, 4340, DIN 1.8550
Stineless steel & high speed steels Eg. 300 & 400 series , M2, M42 & T15.
Cast irons & sintered metallurgy materials, Eg. ASP 23
Cold & hot work steel , Eg : D2, A2, H11, H13

Plasma Nitriding Chambers - 2 tonne capacity

Chamber Capacity :
(1) 1.2mtr. Dia. x 1.3mtr. ht.
(2) 0.8mtr. Dia. x 1.1mtr. ht.

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