Specialists of the Perm National Research Polytechnic University (PNIPU) have developed a reliable coating that will improve the wear and corrosion resistance properties of the surfaces of equipment parts for the processing, mining and oil industries, the university’s press service reported on August 27.
The quality of protective coatings, which make various tools, friction pairs and machine parts in many industries resistant to wear and damage, determines the service life of equipment as well as the frequency of repair and replacement of components.
To improve the quality of coatings operating under abrasive loads and aggressive environments, PNIPU scientists developed a new technology for their application and received patent number 2822143: “Method for producing a multilayer coating for working under tribocorrosion conditions.” (Tribocorrosion is the process of destruction of a material due to the combined effects of corrosion and wear.)
This method provides the specified composition, structure and properties of a multilayer coating, which is a “sandwich”, where first a sublayer of titanium is applied to the product, the surface of which has been previously subjected to ion cleaning, then layers of three compositions are alternated several times: zirconium aluminum nitride, titanium nitride, aluminum nitride, and the last layer of zirconium aluminum nitride is applied.
The coating is applied to products rotating in a mixture of nitrogen and argon gases at a pressure of 0.7 to 0.75 Pa, using four vacuum magnetrons for each sprayed coating material.
The high-speed coating process guarantees its thermodynamic stability, as well as physical-mechanical and wear-resistant properties, high hardness and increased resistance to cracking.
Anna Kameneva, a professor at the Department of Innovative Technologies in Mechanical Engineering at PNRPU, said that such a coating increases the efficiency of equipment use by reducing the corrosion rate by 2-18 times and increasing wear resistance by 2-3 times.
He gave several examples of tools where these coatings can be used:
“The durability of high-speed steel drills and cutters for processing stainless steel has increased by 2-4 times. The durability of cutters and crowns used in processing sylvinite ore is 2-3 times higher. In addition, the maximum operating temperature of tools, friction pairs and machine parts has increased to 1000-1100 °C.”.
Technological processes developed by scientists from Perm Polytechnic have already been recommended for implementation in domestic enterprises.
Source: Rossa Primavera
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