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Economic trends in power engineering and electrical engineering required the use of new types of heat-resistant materials. There was a need to develop new alloys that would not be inferior to the basic qualities of nichrome, but differed from them by a lower cost. The realization of this task was the invention of fechrali. This material, due to the absence of expensive nickel in its composition, costs several times cheaper than nichrome, but in terms of manufacturability, heat resistance and other important for the industry qualities, it is almost inferior to its more expensive prototype.
The qualities of the tape
As a rule, the choice of the brand of felts for the manufacture of ribbons depends on the expected working conditions and the influence of destructive factors on the tape. Quite often, an alloy of grade X15Y5 or X23YU5T is used for production.
The percentage composition of X23YU5T is GOST 10994−74 .
The remainder is iron.
The percentage composition of X15U5 GOST 10994−74 .
In the manufacture of a tape, not only the material used as a raw material is important, it is equally important to correctly determine the geometric characteristics of the product, such as the length of the tape and its cross-section. This will depend on the reliability of the heating element. There are special tables on which you can choose the appropriate geometric parameters of the product, depending on the temperature and current strength.
|Physical qualities of fechrali X23SY5T|
|Ud. Weight g / cm 3||7.21|
|Operating temperature t ° С||Up to 1250 ° С|
|Melting point t ° C||1500 ° С|
|Annealing temperature t ° С||870−1040 ° C|
|Ud. Electric resistance Ohmmm 2 / m||1.39|
|Hardness НВ x0.1 MPa||200−250|
|The limit is short. Strength of the tape MPa||765|
The demand of the tape is not limited only to the production of heating elements for electrical equipment. Quite often such a product serves as a reliable protection for other structural elements of equipment operating under conditions of high temperature conditions. After all, high heat resistance and considerable specific resistance of fecal, as well as its resistance to destruction under the influence of aggressive substances, allows it to provide reliable protection for other materials from harmful effects. The tape is relevant in many branches of the production complex from engineering and manufacturing of electrical equipment to construction and military-industrial complex.
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