Page 25 - Станочный парк английская версия

INNOVATIVE TECHNOLOGY

Technology of application of carbide alloy coatings

The article discusses the production of wear-resistant composite coatings by
electrocontact sintering of powders. It is shown that electrical contact sintering provides
for electric heating of a metal powder placed between the part and an electrode, due to
the thermal energy released by the electric current at the resistance.

A significant increase in the mounted on the basis of a lathe, and is
performance of many types of products is shown in Fig. 1.
achieved by applying coatings on their surface Deep regulation of the power
based on the combination of tungsten and necessary to achieve temperatures of the
titanium. The use of such coatings allows order of 1500 - 2000 ° C is provided by
not only to increase the wear resistance of thyristor voltage control on the primary
products and tools several times, but also winding of the power transformer.
to design fundamentally new types of tools Experimental data show that the depth
and friction units. of the transition diffusion layer reaches
Unlike other types and methods of 0.1 ... 0.15 mm, which indicates a good
coating, electrical contact sintering allows adhesion of the coating to the substrate.
you to form a working layer with a thickness
of 0.5 ... 2.5 mm directly in the process
of working. Thus, the resulting coating is
no longer an integral part of the surface of
the product, improving its properties, but
works as an independent body, perceiving
the entire load.
Obtaining wear-resistant composite
coatings by electrocontact sintering of
powders is most competitive on tools on the
working surfaces of which it is practically
impossible for the technical reasons to
solder carbide-cutting inserts using known
technologies.
Such products include sophisticated tools,
sophisticated working bodies of various Fig. 1. Schematic diagram of the installation for coating
crushers and the entire series of disc by electrocontact method.
cutting tools. However, it is necessary to
fulfill a number of requirements, which are The results are shown in fig. 2.
as follows: The developed technology is low-
● provide coating hardness not lower waste and resource-saving. There is an
than 82 ... 85 НRС, opportunity without the use of complex
● ensure the adhesion of the powder molds to perform carbide heat-resistant
coating to the surface of the substrate, coatings on complex tools and working
● the amount of applied coating must bodies of crushing plants.
satisfy the conditions of maximum wear According to this technology, a
resistance for a given operation. coating was applied to the working bodies of
In our case, a technology has been crushers for grinding rocks and agricultural
developed for applying a wear-resistant products. The test results were compared
composite coating on an installation with the working bodies made of hardened

Stanochniy park 25