29KK, Kovar®, Nilo®
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Metal raw materials with precise chemical composition and guaranteed unchanged physical characteristics play a very important role in the development of modern industry. One of the brightest representatives of the class of precision materials is the alloy of 29NK or kovar, as it is also called.
High quality manufacturing of this material guarantees the absence of any impurities and additives. In the classical version, the mixture consists of twenty-nine percent nickel, seventeen percent cobalt and an iron base. Such a successful combination of the basic chemical ingredients of the composition provides unique performance characteristics. First, such material differs from other alloys of this class by a rather high coefficient of specific electrical resistance and almost zero index of linear temperature expansion in a wide temperature range (from twenty to four hundred degrees) against a background of excellent thermal conductivity (about 19 W / m◦C). These characteristics fully explain the good performance parameters of the material and the absence of significant plastic deformation of parts made from it, even with a significant increase in the temperature index of the working area. However, before using such a raw material, it is worth taking into account its significant disadvantage in the form of low corrosion resistance in a humid environment. To increase the stability of semi-finished products from such an alloy to wet corrosion, they are covered with a protective layer.
|Percent composition according to GOST 10994−74|
From this alloy can be produced a sufficiently large number of various products: pipe, tape or wire. Most often, such raw materials are used in the production of capacitors, but to increase the resistibility of the material to moisture, the alloy is preliminarily coated with a thin silver protective layer. Also, the alloy 29NK is in great demand in radio electronics and the electrovacuum industry, manufacturing cases for equipment in instrument making. The presence of expensive nickel and cobalt in the material increases its cost, but high working and technological characteristics, as well as reliable long-term operation completely compensate for the initial costs.
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