Tennifer QPQ method
Surface conversion of material in hydraulic area
According to Tenifer method, the salt bath of components made of steel, cast iron and sintered iron materials is used globally in various industries for decades.
It is used for increasing the abrasion resistance, the creep resistance and the corrision resistance, particularly in connection with the oxidising cooling down.
In many cases, the Tenifer method is an alternative to other barrier layer methods, as case hardnesses, galvanic (for example hard-chrome plating) and other coating methods (plastic coating, painting, laser coating etc.) or plasma respectively nitrocarburising, at the same or improved quality and greater economy.
The Process implementation at Tenifer Q-, QP respectively QPQ method is in comparison to other nitrocarburising methods very easy. As is common in the treatment of components in salt baths, the parts are first preheated in air at about 350 ° C. Nitrocarburizing takes place in so-called TF 1 bath at 480-630 ° C, the usually chosen standard temperature is 580 ° C. The salt melt essentially consists of alkali cyanate and alkali metal carbonate, and is operated in a crucible made of special material with aerator.
The active component in TF1 bath is the alkali cyanate. During the nitrocarburizing the alkali cyanate formes itself in the reaction with the component surface alki cyanate. By adding specific amounts of non-toxic regenerator REG 1, the nitriding component is directly re-generated in the molten salt and keeps the activity of TF 1 bath in very narrow limits.
source: Durferrit GmbH