KR20160088888A - Wear-resistant anti-friction coating for friction pair components - Google Patents

Abstract

The present invention relates to a precision wear-resistant anti-friction coating which can be obtained by a vacuum-arc deposition method and which can be used in mechanical engineering and aircraft engineering to create designs with improved erosion prevention, anti-friction and protection properties. The coating comprises a nitride layer, a first titanium layer, a second layer in the form of alternating nanolayers of titanium and titanium nitride, a third layer in the form of alternating nanolayers of titanium nitride and aluminum nitride, Lt; / RTI > layer. The claimed anti-friction coating provides a high level of operational reliability of the assembly with a continuous and novel design and increases its service life 5 to 20 times.

Description

[0001] Wear-resistant anti-friction coating for friction pair components for friction-

The present invention relates to high precision anti-friction wear-resistant coatings which can be obtained by vacuum-arc deposition and which can be used in mechanical engineering, aircraft, to create designs with high anti-erosion, anti-friction and protection properties.

One of the most important components of pumps HP180 and HT40, which is used extensively in the control of pumps, especially fuel supply and aircraft engines, is the distributing slide valve (pair base-sole). The flat distribution valve isolates the pump absorption and release cavities. The bronze pumping unit is slid by a working plane spool cured by nitridation of hardness ≥ 770 HV to make the fuel feed pump the desired pressure.

In order to ensure the efficiency of the pump, the working plane spool and pumping unit are fabricated with a nano flatness of? 0.001 mm and _a surface roughness of R _a = 0.08.

The above-mentioned pairs of friction can be used to produce jet fuels (kerosene of different qualities) at significantly higher speeds (up to 7000 revolutions per minute) and pressure (unit sensed pressures up to 20 kg / cm ² ) (kerosene). Thus, an insufficient abrasion resistant spool can effectively limit resource indicator pumps and can lead to failures due to loss of efficiency of the friction pair (LI Seleznev, VA Rizhenkov Estimate of the duration of The incubation period of erosive wear. - Metal Technology, № 3, 2007].

The most effective way to significantly improve the abrasion resistance of structural materials-the use and improvement of protective coatings is known.

The abrasion-resistant and erosion-resistant coating may comprise a plurality of alternating layers of erosion-resistant metal selected from the group consisting of molybdenum, niobium, tantalum, tungsten, chromium, titanium, zirconium, nickel, Layer. For example, the first layer may be a metal or metal mixture formed in a medium of neutral gas or a layer of 1VA V1A of the Medeleeva Periodic Table of Elements, the second layer being a reactive mixture of neutral and reactive gases, A third layer is known as a three-layer coating which is a layer of nitrides, carbides, borides or mixtures thereof (Patent RF 2161661, I. Cl. C23C 14/16, publ. Detailed description of 10.01.2001]. The coating may comprise a sublayer of scandium, yttrium or rare earth metals of 0.02-0.08 micron thickness, the number of layers may be x to 500, and the layer thickness may be (0.02 - 5.0) (0.04 - 10) -12.5), and the thickness of the first two layers is 1.0: 2.0: 2.5.

The abrasion resistant coatings described above have wear resistance, but are not sufficient for the harsh environments mentioned above.

(Cr-V) having the following ratios of chromium and vanadium atoms%: Cr 28-50, V 50-72 A wear-resistant ion based on chromium nitride deposited on a metal product comprising vanadium A wear-resistant ion-plasma coating is known (Russian patent number 2,025,543, I. Cl. C 23 C 14/08, publ. 30.12.1994 y.].

The coatings described above can be used in industry to improve abrasion resistance of cutting tools and technical tools, which have varying abrasion resistance of 1-3.08, depending on the composition.

The abrasion resistance of such coatings is relatively high, but its use is largely limited to cutting tools, i.e. tools designed for rapid recovery in industrial production.

Abrasion-resistant ionic-plasma coatings based on complex complex nitrides (TixAlyCrz) N of titanium, aluminum and chromium supported on metallic or ceramic products [Russian patent number 2,050,060, I. Cl. C 23 C 14/06, publ. Wherein the content of chromium (z) depends on the content of aluminum and titanium and is limited to 1/7 to 1/5 of (xy), and 0,05? X? Y, x / y <1 A wear resistant ionic-plasma coating is also known.

The coatings described above have improved abrasion resistance and can be used in cutting tools. That is, its function is also limited to this area. ***

To the closest possible objective to the claimed technical solution, the technical nature and results of the use are based on a multilayer coating comprising a layer of nitrided and nitrided titanium and aluminum (see U.S. Pat. Patent Application No. US 2009/0123737, and the coating of the treated surface to be resistant to erosion by solid particles, I. Cl. B32B 18/00, publ. 14.05.2009] is a multilayer coating having a total thickness of 19 microns to 20 microns, with titanium nitride located on the nitrided layer obtained in a conventional manner, alternating with an AlCrN layer having a thickness of 10 nm to 100 nm.

Such coatings can have substantial resistance to abrasion. However, the formation of such a coating involves a significant change in the geometric parameters of the work surface. In order to use treated surfaces in many devices, they require extra processing associated with a reduction in the coating thickness of up to 1-2 microns to invalidate the results of chemical-thermal treatments.

Modern research on the development of new materials with recordable performance in terms of wear resistance, roughness and operating opportunities in extreme conditions has produced a multicomponent composition containing structural elements that are closely sized from a few hundreds to a few nanometers Is related to the direction of nanotechnology. Such materials may be several times higher in their properties in terms of friction and other properties than materials of the same composition having a conventional structure.

The basis of the present invention is the improvement of a wear-resistant coating for a friction pair containing a nitrided layer, a titanium and an aluminum nitride layer, wherein the first layer on the surface of the pre-nitrided base material Titanium Layer, Titanium and Nitride Titanium The second layer in the form of a nanometer layer, the third layer in the form of a nanometer layer alternating with titanium nitride and aluminum nitride, and the execution of the fourth layer of aluminum nitride, It is a challenge to provide technical results. In the manufacture of a transitional layer, a transition from a brittle nitrided surfece through a robust base nanolayer to the exterior of a running-coated aluminum nitride with high chemical non-reactivity A smooth change in plasticity of the layer is provided. These surfaces during the running-in layer provide the best pair of running friction surfaces to improve the durability of the nanotubular-coated TiN-AlN coating, and the aggressive environment, including erosion To provide resistance to wear of any kind.

The problem is that in a known abrasion-resistant coating comprising a nitride layer and a nitride layer of titanium and nitrite aluminum, according to the invention, a first titanium layer is produced on the pre-nitrided surface of the base material, The second layer is in the form of an alternating nano layer of titanium and titanium nitride and the third layer is also in the form of an alternating nano layer of titanium nitride and aluminum nitride and the fourth layer is made of aluminum nitride do.

According to the present invention, the first layer is made of titanium with a thickness of 0.2-0.3 manichron.

According to the present invention, the second layer is in the form of alternating nanolayers of titanium and titanium nitride, the repetition period of which is 10 nm, the thickness of the individual nanolayers is 2 nm and 8 nm, respectively, 0.2-0.3 microns.

According to the present invention, the third layer is in the form of alternating nanolayers of titanium nitride and aluminum nitride TiN-AlN (50/50) with a repetition period of 20 nm, the nanolayers having a uniform thickness , The overall thickness of the layer is 0.5-0.7 microns.

According to the invention, the fourth layer is made of aluminum nitrides of 0.3-0.5 manichron thickness.

As can be seen from the above technical solution, the claimed essence is different from the prototype and is therefore novel.

The solution of the present invention is to maintain the strength characteristics of precision components operating at high speeds with high resistance to wear and seizures and to maintain the relative motion of the parts of the friction pair and the substantial axial load Is fundamentally different from the prior art in that it provides a supported coating.

The proposed solution is industrially available and is implemented in the form of a coating Avinit C310-n1 using equipment manufactured under modern production conditions.

Table 1 shows the properties of the coatings applied to the steel samples 8X4B9F2 - Ш.

‡ H _V = 3000 - A measurement of microhardness HV ₁₀₀ for evidence samples using PMT-3 microhardness values given by 3200 Vickers. The thickness of the coating is 9 microns.

† Company CSM (Switzerland) (load factor 20,00 mH / min, maximum depth of 100,00 nm at 0.6 g load, treatment of results - at model Oliver-Farah), H = 2500 - 3000 MPa, E = 250 -300 Measuring the Nano Hardness and Young's modulus of coated Avinit C310-n1 for evidence samples using a device for measuring the nano hardness of Poisson's ratio at GPa, K = 0,30. A coating thickness of 1.5 micrometers is optimal.

The friction tests were carried out on a wide range of diagram "cube-rollers" in pairs of steel 8H4V9F2-Ш-bronze and a coating Avinit C310-n1 (TiAlN-AlN) Was performed to determine the values of the friction factor F _fr , wear-out and resistance to points at PV (up to a value of PV ≥ 2000 [kgf / cm xm / s]):

- bronze Br.010S2H3 treated by industrial technique;

;- Bronze treated by industrial technology Br.Cu3H3СS20F0,2

;

- Bronze Br.Сu6F0,9 (VB-24) treated by industrial technology.

At the same time, it was found that the friction pair having a working surface having the nanofiber Avinit C310-n1 sheath tested under boundary lubrication (working fluid-jet fuel TC-1) has the following characteristics:

- high tolerance to scoreform;

- Best running - Working surface - "Coated Avinit C310-n1 (TiAlN - AlN) - Bronze Br.010S2N3 treated with industrial technology";

- a lack of a second run-in during a heating period of about 60 min, after which the coefficient of friction is stabilized to within 0.1 ... 0.09 at a constant load of 1600H;

- "Fabric Avinit C310-n1 (TiAlN - AlN) - the best abrasion resistance of both work surfaces without setting the bronze Br.Su6F0,9 (VB -24)" pair treated by industry technology.

The abrasion resistance of the Avinit C310-n1-Bronze as the actual sample and general bond is the maximum and significantly higher than the "basic" pair "8H4V9F2-SH-Bronze Br.Su3N3CS20F0,2 (VB23 NC) It is better when operating in.

The abrasion weight detected after 8 hours of abrasion test is as follows:

- at least 12 times smaller than the "base" of the pair as a whole;

- at least 2.5 times smaller than a more robust sample pair:

At least 44 times smaller than a more ductile sample pair;

On the "direct" pair after 8 hours of testing, the coating exhibits almost zero wear or deterioration that is not present in the applied control method, indicating high wear resistance of these pairs. The coefficient of friction was calculated from the "Couplings" Avinit C310-n1 (TiAlN-AlN) - bronze Br.Su6F0 (TiAlN - AlN) treated by the industrial technique versus the "basic" pair 8H4V9F2 - SH - Br.Su3N3CS20F0,2 , And 9 (VB -24).

The lowest coefficient of friction is pair-work with a roughness Ra of 10 without any subsequent machining. The surface has a hardness of 3200 HV and a coating Avinit C310-n1 with a thickness of 0,001 ... 0,002 mm, applied to the steel nitrile 8X4V9F2-SH.

The coefficient of friction of the pair did not exceed 0.095 over the entire load range and was 0.065 corresponding to the minimum value obtained for the friction pair of the irradiated coating at full load.

In addition to those mentioned above, any Br.Su6F0,9 (VB-24) is a very low-level technique for diffusion welding used in the friction manufacturing process of a friction pair, Avinit C310-n1 (TiAlN-AlN) as promising allows to select the friction pair of bronze Br.010S2N3 treated by industrial technique.

An aggregate experienced party distribution spool with and without coated or uncoated Avinit C310-n1 resource was prepared (Table 2).

Table 2. Geometrical parameters of the dispensing spool

Compared to the state before coating, the geometric distortion and the roughness of the coated surface are not detected.

As a result of the resource set test (Table 3), the coating C310-n1 on the working plane distributor spool provides significantly higher performance pump resources.

Table 3. Test results of aggregate resource

During the test, another significant positive point of application of the nanoparticle coating Avinit C310-n1 was detected.

Generally, a working environment caulking product is created that further degrades friction conditions and significantly limits the resource surface friction pair when operating on an aircraft fuel pump in an extremely high temperature friction region. The test shows that the use of the nanoparticle coating Avinit C310-n1 almost completely prevents kerosene coking under the operating conditions of the unit, which improves the work triboparah pair.

Thus, the application of the nano-layer Avinit C310-n1 coating in friction with dispense slide valves ensures high reliability and production of new aggregate designs and increases their service life by 5-20 times.

Improvements in resource operations,

The compatibility of the friction coating material with the material pumping unit for all operating conditions of the pump, with some reduction in coefficient of friction;

- the coating does not change the initial geometric parameters of the working plane, as defined above, while increasing the hardness (strength) of the working plane of the distribution bale to ≥ 3200 HV;

- by eliminating the negative impact of the kerosene coking product on the performance of the friction pair.

Claims (5)

A wear-resistant anti-friction coating friction pair comprising a nitrided layer and layers of titanium and aluminum nitride,
The first layer is made on the pre-nitrided surface of the base material, the second layer is made in the form of alternating nano-layers of titanium and titanium nitride, the third layer is also made of titanium nitride and aluminum nitride Wherein the second layer is made in the form of alternating nano-layers and the fourth layer is made of aluminum nitride. The method according to claim 1,
Characterized in that the first layer is made of 0.2-0.3 micron thick titanium. The method according to claim 1,
The second layer is made in the form of alternating layers of titanium and titanium nitride, their repetition period is 10 nm, the thickness of the individual nanolayers is 2 nm and 8 nm, respectively, and their total thickness is 0.2-0.3 microns Resistant anti-friction coating. The method according to claim 1,
The third layer is made in the form of alternating nanolayers of titanium nitride and aluminum nitride TiN-AlN (50/50), their repetition period is 20 nm, the nanolayers are chosen to be of uniform thickness, Characterized in that the total thickness is 0.5-0.7 microns. The method according to claim 1,
Wherein the fourth layer is made of aluminum nitride in a thickness of 0.3-0.5 microns.