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METALWORKING EQUIPMENT METALWORKING EQUIPMENT
AND TOOLS AND TOOLS

● wear rate of the coating - the ratio of the volumetric
wear of the coating to the time during which the wear
occurred,

Wc = Vc /tисп [mm3/s];
● intensity of coating wear - the ratio of the volumetric
wear of the coating to the friction path on which the
wear occurred,

Ic = Vc /S [mm3/m];

● rate of wear of the coating and substrate - the
ratio of the total volumetric wear of the coating and

Fig. 6. Micrograph of one of the imprints of MultiPateks
coating on steel P6M5 after microabrasive wear tests
Fig. 4. Measured parameters: a - for a monolithic material (substrate or thick coatings), b - for thin-film coatings,
where 1 is the direction of rotation of the ball.
. substrate to the time during which the

volumetric wear of the substrate (taking into account wear occurred,
their combined effect)
Wcs = Vc +Vs /tисп [mm3/s];

● the rate of wear of the coating and
substrate - the ratio of the value of the
the sum of the volumetric wear of the coating and total volumetric wear of the coating and
the substrate Vc + Vs [mm3], where a is the average substrate to the friction path on which
value of the coating diameter aipar ср and aiperp ср the wear occurred,

a = (aipar ср+aiperp ср)/2 Ics = Vc +Vs /S [mm3/m].

Auxiliary design parameters are: Fig. 7. Micrograph of one of the imprints of the TiN coating on steel Comparative analysis of the
● coefficient of wear of the substrate - the ratio of R6M5 after testing for microabrasive wear. calculated parameters is carried out:
the volumetric wear of the substrate to the length of ● between volumetric wear of an uncoated
the sliding path and normal load Fig. 5. Micrograph of indentation No. 1 after tests for substrate (e.g. measured on the reverse side of the coated sample) and the total volumetric
microabrasive wear of steel R6M5. . wear of the coating with the substrate;

, ● between the volumetric wear of the same substrate (samples from the same initial material and
their manufacturing technology) with different thin-film coatings (by thickness, by composition,
where S is the length of the sliding path, N is the normal load to the sample surface; by type, by physical and mechanical properties).
● the coefficient of wear of the coating at an indentation depth less than the thickness of the A coating that increases the resistance of the substrate specimen against microabrasive
coating - the ratio of the volumetric wear of the substrate to the length of the sliding path and wear should have a volumetric wear Vs + Vc less than the volumetric wear of an uncoated
normal load substrate specimen Vs.
The objectivity of the comparative assessment of coatings in terms of parameters related
, to volumetric wear is based on the constancy of the type of friction (sliding), force and kinematic
parameters (pressure on the friction surface, sliding speed), external conditions (temperature,
● the coefficient of wear of the coating when the indentation depth is greater than the thickness humidity, vibration) and test conditions (constancy counterbody, abrasive material and its
of the coating amount).
Based on the developed technique, tests were carried out for microabrasive wear of the
MultiPateks coating (multicomponent, multilayer, gradient nanocoating of the H-SiOCN system),
applied with final plasma hardening (FPU) [2], and the widely used TiN coating, deposited by
● the rate of wear of the substrate - the ratio of the volumetric wear of the substrate to the time the method of vacuum ion-plasma deposition separation of the plasma flow on the modernized
during which the wear occurred, installation NNV6.6I1. These coatings are most widely used for hardening metal cutting tools.
Ws = Vs /tисп [mm3/s];
High-speed steel R6M5, HRC 62-64 was used as a substrate material. The thickness of the
applied coatings was about 2 - 3 microns. The FPU process used is a method of increasing the
● the rate of wear of the substrate - the ratio of the volumetric wear of the substrate to the durability of parts and tools by applying thin-film coatings up to 3 μm thick using the technology
friction path on which the wear occurred,
of tubeless chemical deposition using liquid organoelement compounds and activation by electric
arc plasma. The main advantages of FPU are: implementation of the process without vacuum
Is = Vs /S [mm3/m];

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