CN112610608B - A kind of wide temperature range self-lubricating bearing and preparation method thereof - Google Patents

Abstract

The invention provides a wide-temperature-range self-lubricating bearing and a preparation method thereof. The wide-temperature-range self-lubricating bearing comprises a bearing substrate, a micro-texture and a composite coating, wherein the micro-texture is arranged on the surface of the bearing substrate, and the composite coating is deposited on the surface of the micro-texture; the composite coating comprises a first coating and a second coating, and the first coating and the second coating are alternately superposed. When the working temperature is lower, the second coating can play a role in lubrication; when the working temperature is higher, the first coating and the second coating react to generate a compound with a high-temperature lubricating effect, so that the lubricating effect can be achieved. The bearing has good self-lubricating effect under the conditions of wide temperature range or alternating temperature, can reduce the abrasion of the bearing and prolong the service life.

Description

A kind of wide temperature range self-lubricating bearing and preparation method thereof

technical field

The invention relates to the technical field of bearing manufacturing, in particular to a wide temperature range self-lubricating bearing and a preparation method thereof.

Background technique

Bearings are an important part of contemporary mechanical equipment. There is a large amount of friction and wear in the working process of bearings, and lubricants are usually used during the use process; Due to limitations, self-lubricating bearings have become a research hotspot in green manufacturing. Therefore, the development of new high-strength, low-friction, low-wear and long-life self-lubricating bearings is of great significance to advanced manufacturing!

Chinese Patent Application No. 201910511263.1 discloses a friction-reducing and anti-wear self-lubricating coated bearing and a preparation method thereof. The bearing is prepared with a cemented carbide layer, a silicon nitride ceramic layer and a cubic boron nitride layer on the surface of the substrate by a plasma spraying method. Layer composite lubricating coating to achieve the lubricating effect during the working process. Chinese Patent Application No. 201320341799.1 discloses an inlaid solid self-lubricating bearing. The side of the bearing body is provided with an annular groove and a through hole for storing solid lubricant, which can realize self-lubrication in the working process, reduce the friction coefficient and prolong the bearing life. Chinese Patent Application No. CN201710547274.6 discloses a self-lubricating bearing and a preparation method thereof. A graphene/calcium fluoride/ceramic self-lubricating coating is prepared on the surface of a chromium-containing alloy steel bearing substrate by a laser cladding method, thereby realizing the bearing Its own self-lubricating function.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: to provide a wide temperature range self-lubricating bearing and a preparation method thereof, the bearing has good lubricating effect in a wide temperature range and an alternating temperature range, and can realize the lubrication during the working process of the bearing, Reduce bearing wear and improve bearing life.

In order to solve the above technical problems, one aspect of the present invention provides a wide temperature range self-lubricating bearing, comprising a bearing matrix, a microtexture and a composite coating, the microtexture is arranged on the surface of the bearing matrix, and the composite coating is deposited. On the micro-textured surface; the composite coating comprises a first coating and a second coating, the first coating and the second coating are alternately stacked; the composite coating comprises at least 10 layers of the first coating coating and at least 10 second coats.

As a further improvement of the embodiment of the present invention, the first coating is a TiVZnN layer, the second coating is a MoTeHfC layer, and the single-layer thicknesses of the first coating and the second coating are both less than or equal to 500 nm.

As a further improvement of the embodiment of the present invention, in the first coating, the atomic percentage of Ti element is 30-50 atomic%, the atomic percentage of V element is 10-20 atomic%, the atomic percentage of Zn element is 5-15 atomic%, and the atomic percentage of N element is 5-15 atomic%. The percentage is 20-40%, and the sum of the atomic percentage of Ti element, the atomic percentage of V element, the atomic percentage of Zn element and the atomic percentage of N element is 100%.

As a further improvement of the embodiment of the present invention, in the second coating, the atomic percentage of Mo element is 30-40%, the atomic percentage of Te element is 30-40%, the atomic percentage of Hf element is 8-12%, and the atomic percentage of C element is 8-12%. The percentage is 10-20%, and the sum of the atomic percentage of Mo element, the atomic percentage of Te element, the atomic percentage of Hf element and the atomic percentage of C element is 100%.

As a further improvement of the embodiment of the present invention, the bearing base is made of bearing steel.

On the other hand, an embodiment of the present invention also provides a preparation method for preparing the above-mentioned wide temperature range self-lubricating bearing, comprising the following steps:

Step 1. Use laser processing technology to prepare microtextures on the surface of the bearing substrate. The laser power is 10-50W, the frequency is 10-20kHz, and the scanning speed is 5-300mm/s; the width of the microtextures is 10-200μm, the depth is 10-200μm 5-200μm;

Step 2, using the method of multi-arc ion plating and intermediate frequency magnetron sputtering co-deposition, to prepare a composite coating on the micro-textured surface to obtain a wide temperature range self-lubricating bearing.

As a further improvement of the embodiment of the present invention, the step 2 specifically includes:

Step 21. Turn on the Ti target and the VZnN target, adjust the working pressure to 0.5-2.5Pa, the bias voltage to 100-300V, adjust the Ti target current to 50-160A, the VZnN target current to 50-100A, and deposit the TiVZnN layer for 2-5min ;

Step 22. Turn on the MoTe ₂ target, Hf target and C target, adjust the working pressure to 0.5-2.0Pa, the bias voltage to 100-120V, adjust the MoTe ₂ target current to 80-120A, the Hf target current to 30-50A, and the C target current to be 30-50A. The current is 50-80A, and the MoTeHfC layer is deposited for 3-8min;

Step 23, repeating steps 21 and 22, alternately depositing TiVZnN layers and MoTeHfC layers, so that the total thickness of the composite coating is a preset thickness, and a wide temperature range self-lubricating bearing is obtained.

As a further improvement of the embodiment of the present invention, the preset thickness is 1-10 μm.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects: the bearing of the embodiment of the present invention has a good self-lubricating effect in a wide temperature range, and when the working temperature is low, the MoTeHfC coating can lubricate When the working temperature is high, TiVZnN, MoTeHfC and oxygen in the air will react to generate ZnMoO ₄ and V ₂ O ₅ compounds with high temperature lubrication, which can play a good lubricating effect under high temperature conditions. The bearing of the embodiment of the present invention does not need lubricating oil and complex lubrication system, and has a simple structure and is convenient to use; the interlaced stacking of the TiVZnN layer and the MoTeHfC layer improves the performance of a single coating and increases the application range of the bearing. The micro-texture of the bearing surface of this embodiment can improve the bonding strength between the bearing matrix and the composite coating, and can collect wear debris and high-temperature lubricating phases, reduce abrasive wear and provide secondary lubrication, thereby improving bearing life. The bearing of this embodiment has a good lubricating effect in a wide temperature range or under alternating temperature conditions, which can reduce the friction and wear of the bearing during the working process and improve the bearing life.

Description of drawings

1 is a schematic structural diagram of a wide temperature range self-lubricating bearing according to an embodiment of the present invention;

2 is a cross-sectional view of a wide temperature range self-lubricating bearing according to an embodiment of the present invention.

In the figure: bearing base 1 , micro-texture 2 , first coating 31 , second coating 32 , inner ring 6 , outer ring 7 , ball 8 .

Detailed ways

The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings.

The embodiment of the present invention provides a wide temperature range self-lubricating bearing, as shown in FIG. 1 and FIG. 2 , comprising a bearing base 1 including an inner ring 6 and an outer ring 7 , and the balls 8 are located between the inner ring 6 and the outer ring 7 . The wide temperature range self-lubricating bearing of this embodiment also includes microtexture and composite coating. The microtexture 2 is provided on the outer surface of the inner ring 6 and the inner surface of the outer ring 7 , and the composite coating is deposited on the surface. The composite coating includes a first coating 31 and a second coating 32, and the first coating 31 and the second coating 32 are alternately stacked. In the composite coating, the first coating 31 has at least 10 layers, and the second coating 32 has at least 10 layers.

The first coating layer 31 is a TiVZnN layer, the second coating layer 32 is a MoTeHfC layer, and the single-layer thicknesses of the first coating layer 31 and the second coating layer 32 are both less than or equal to 500 nm.

Preferably, in the first coating 31, the atomic percentage of Ti is 30-50%, the atomic percentage of V is 10-20%, the atomic percentage of Zn is 5-15%, and the atomic percentage of N is 20-40%, The sum of the atomic percentage of the Ti element, the atomic percentage of the V element, the atomic percentage of the Zn element, and the atomic percentage of the N element is 100%.

Preferably, in the second coating 32, the atomic percentage of Mo element is 30-40%, the atomic percentage of Te element is 30-40%, the atomic percentage of Hf element is 8-12%, and the atomic percentage of C element is 10-20%, The sum of the atomic percentage of the Mo element, the atomic percentage of the Te element, the atomic percentage of the Hf element, and the atomic percentage of the C element is 100%.

Preferably, the bearing base 1 is made of bearing steel.

The embodiment of the present invention also provides a preparation method for preparing the above-mentioned wide temperature range self-lubricating bearing, comprising the following steps:

Step 1. Use laser processing technology to prepare microtexture 2 on the surface of the bearing base 1. The laser power is 10-50W, the frequency is 10-20kHz, and the scanning speed is 5-300mm/s; the width of the microtexture 2 is 10- 200μm, the depth is 5-200μm;

Step 2, using the method of multi-arc ion plating and intermediate frequency magnetron sputtering co-deposition, to prepare a composite coating on the surface of the microtexture 2 to obtain a wide temperature range self-lubricating bearing.

The method of the embodiment of the present invention adopts the method of co-deposition of multi-arc ion plating and intermediate frequency magnetron sputtering to prepare the composite coating on the surface of the bearing substrate, and the preparation method is simple.

Preferably, step 2 specifically includes:

Step 21. Open the Zr target and the VZnN target, adjust the working pressure to 0.5-2.5Pa, the bias voltage to 100-300V, adjust the Zr target current to 50-160A, the VZnN target current to 50-100A, and deposit the TiVZnN layer for 2-5min ;

Step 22. Turn on the MoTe ₂ target, Hf target and C target, adjust the working pressure to 0.5-2.0Pa, the bias voltage to 100-120V, adjust the MoTe ₂ target current to 80-120A, the Hf target current to 30-50A, and the C target current to be 30-50A. The current is 50-80A, and the MoTeHfC layer is deposited for 3-8min;

Step 23: Repeat steps 21 and 22 until the total thickness of the composite coating is the preset thickness, and a wide temperature range self-lubricating bearing is obtained.

Preferably, the preset thickness is 1-10 μm.

The bearing of the embodiment of the present invention has a good self-lubricating effect in a wide temperature range. When the working temperature is low, the MoTeHfC coating can play a lubricating effect; when the working temperature is high, TiVZnN, MoTeHfC and oxygen in the air will occur After the reaction, ZnMoO ₄ and V ₂ O ₅ compounds with high temperature lubricating effect are generated, which can play a good lubricating effect under high temperature conditions. The bearing of the embodiment of the present invention does not need lubricating oil and complex lubrication system, and has a simple structure and is convenient to use; the TiVZnN+MoTeHfC laminated coating improves the performance of a single coating and increases the application range of the bearing. The micro-texture on the surface of the bearing base prepared by the method in this embodiment can improve the bonding strength between the bearing base and the composite coating, and can collect wear debris and high-temperature lubricating phases, thereby reducing abrasive wear and providing secondary lubrication function, thereby increasing bearing life.

Example 1

The microtexture was prepared on the surface of the bearing matrix by laser processing technology. The laser power was 12W, the frequency was 20kHz, the scanning speed was 10mm/s, the microtexture width was 50μm, and the texture depth was 100μm; the Ti target and VZnN target were turned on, Adjust the working pressure to 0.5Pa, the bias voltage to 150V, adjust the Ti target current to 50A, the VZnN target current to 60A, and deposit the TiVZnN layer for 5min; turn on the MoTe ₂ target, Hf target and C target, adjust the working pressure to 0.5Pa, and the bias The voltage is 100V, the MoTe ₂ target current is adjusted to 90A, the Hf target current is 30A, the C target current is 60A, and the MoTeHfC layer is deposited for 8min; the TiVZnN layer and the MoTeHfC layer are alternately deposited until the total thickness of the composite coating is 10μm, obtaining a wide temperature range Self-lubricating bearings.

In the prepared wide temperature range self-lubricating bearing, the material of the bearing base is GCr15 bearing steel, the surface of the bearing base has a micro-texture, and the surface of the micro-texture has a composite coating. The composite coating includes 10 layers of TiVZnN layers and 10 layers of MoTeHfC layers that are alternately stacked, and the thickness of a single layer of the TiVZnN layer and the MoTeHfC layer is 500 nm. In the TiVZnN layer, the atomic percentage of Ti element is 30%, the atomic percentage of V element is 20%, the atomic percentage of Zn element is 15%, and the atomic percentage of N element is 35%. In the MoTeHfC layer, the atomic percentage of Mo element is 30%, the atomic percentage of Te element is 40%, the atomic percentage of Hf element is 10%, and the atomic percentage of C element is 20%.

Example 2

The microtexture was prepared on the surface of the bearing matrix by laser processing technology. The laser power was 30W, the frequency was 10kHz, the scanning speed was 300mm/s, the width of the microtexture was 100μm, and the depth of the microtexture was 50μm; the Ti target and the VZnN target were turned on. , adjust the working pressure to 2.0Pa, the bias voltage to 300V, adjust the Ti target current to 150A, the VZnN target current to 80A, and deposit the TiVZnN layer for 3 minutes; turn on the MoTe ₂ target, Hf target and C target, adjust the working pressure to 2.0Pa, The bias voltage is 120V, the MoTe ₂ target current is adjusted to 100A, the Hf target current is 50A, the C target current is 50A, and the MoTeHfC layer is deposited for 3min; the TiVZnN layer and the MoTeHfC layer are alternately deposited until the total thickness of the composite coating is 4μm, and a wide temperature range is obtained. Domain self-lubricating bearings.

In the prepared wide temperature range self-lubricating bearing, the material of the bearing base is G8Cr4M04V bearing steel, the surface of the bearing base has a micro-texture, and the surface of the micro-texture has a composite coating. The composite coating includes 20 layers of TiVZnN layers and 20 layers of MoTeHfC layers alternately stacked, and the thickness of a single layer of the TiVZnN layer and the MoTeHfC layer is 100 nm. In the TiVZnN layer, the atomic percentage of Ti element is 50%, the atomic percentage of V element is 10%, the atomic percentage of Zn element is 10%, and the atomic percentage of N element is 30%. In the MoTeHfC layer, the atomic percentage of Mo element is 40%, the atomic percentage of Te element is 40%, the atomic percentage of Hf element is 8%, and the atomic percentage of C element is 12%.

Example 3

The microtexture was prepared on the surface of the bearing matrix by laser processing technology. The laser power was 50W, the frequency was 25kHz, the scanning speed was 100mm/s, the microtexture width was 200μm, and the texture depth was 200μm; open the Ti target and the VZnN target, Adjust the working pressure to 0.5Pa, the bias voltage to 150V, adjust the Ti target current to 50A, the VZnN target current to 60A, and deposit the TiVZnN layer for 5min; turn on the MoTe ₂ target, Hf target and C target, adjust the working pressure to 0.5Pa, and the bias The voltage is 100V, the MoTe ₂ target current is adjusted to 90A, the Hf target current is 30A, the C target current is 60A, and the MoTeHfC layer is deposited for 8min; the TiVZnN layer and the MoTeHfC layer are alternately deposited until the total thickness of the composite coating is 10μm, obtaining a wide temperature range Self-lubricating bearings.

In the prepared wide temperature range self-lubricating bearing, the material of the bearing base is GCr15 bearing steel, the surface of the bearing base has a micro-texture, and the surface of the micro-texture has a composite coating. The composite coating includes 10 layers of TiVZnN layers and 10 layers of MoTeHfC layers that are alternately stacked, and the thickness of a single layer of the TiVZnN layer and the MoTeHfC layer is 500 nm. In the TiVZnN layer, the atomic percentage of Ti element is 40%, the atomic percentage of V element is 15%, the atomic percentage of Zn element is 5%, and the atomic percentage of N element is 40%. In the MoTeHfC layer, the atomic percentage of Mo is 38%, the atomic percentage of Te is 30%, the atomic percentage of Hf is 12%, and the atomic percentage of C is 20%.

Example 4

The microtexture was prepared on the surface of the bearing matrix by laser processing technology. The laser power was 1W, the frequency was 10kHz, the scanning speed was 5mm/s, the width of the microtexture was 10μm, and the depth of the microtexture was 5μm; the Ti target and the VZnN target were turned on. , adjust the working pressure to 2.0Pa, the bias voltage to 300V, adjust the Ti target current to 150A, the VZnN target current to 80A, and deposit the TiVZnN layer for 3 minutes; turn on the MoTe ₂ target, Hf target and C target, adjust the working pressure to 2.0Pa, The bias voltage is 120V, the MoTe ₂ target current is adjusted to 100A, the Hf target current is 50A, the C target current is 50A, and the MoTeHfC layer is deposited for 3min; the TiVZnN layer and the MoTeHfC layer are alternately deposited until the total thickness of the composite coating is 4μm, and a wide temperature range is obtained. Domain self-lubricating bearings.

In the prepared wide temperature range self-lubricating bearing, the material of the bearing base is G8Cr4M04V bearing steel, the surface of the bearing base has a micro-texture, and the surface of the micro-texture has a composite coating. The composite coating includes 20 layers of TiVZnN layers and 20 layers of MoTeHfC layers alternately stacked, and the thickness of a single layer of the TiVZnN layer and the MoTeHfC layer is 100 nm. In the TiVZnN layer, the atomic percentage of Ti element is 50%, the atomic percentage of V element is 20%, the atomic percentage of Zn element is 10%, and the atomic percentage of N element is 20%. In the MoTeHfC layer, the atomic percentage of Mo is 40%, the atomic percentage of Te is 38%, the atomic percentage of Hf is 12%, and the atomic percentage of C is 10%.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned specific embodiments. The above-mentioned specific embodiments and descriptions in the specification are only to further illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, this Various changes and modifications of the invention are also possible, all of which fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the claims and their equivalents.

Claims (5)

1. The wide-temperature-range self-lubricating bearing is characterized by comprising a bearing substrate (1), a microtexture (2) and a composite coating, wherein the microtexture (2) is arranged on the surface of the bearing substrate (1), and the composite coating is deposited on the surface of the microtexture (2); the composite coating comprises a first coating (31) and a second coating (32), wherein the first coating (31) and the second coating (32) are alternately superposed; the composite coating comprises at least 10 first coating layers (31) and at least 10 second coating layers (32);

the first coating (31) is a TiVZnN layer, the second coating (32) is a MoTeHfC layer, and the single-layer thicknesses of the first coating (31) and the second coating (32) are less than or equal to 500 nm;

in the first coating (31), the atomic percent of Ti element is 30-50%, the atomic percent of V element is 10-20%, the atomic percent of Zn element is 5-15%, the atomic percent of N element is 20-40%, and the sum of the atomic percent of Ti element, the atomic percent of V element, the atomic percent of Zn element and the atomic percent of N element is 100%;

in the second coating (32), the atomic percent of Mo element is 30-40%, the atomic percent of Te element is 30-40%, the atomic percent of Hf element is 8-12%, the atomic percent of C element is 10-20%, and the sum of the atomic percent of Mo element, the atomic percent of Te element, the atomic percent of Hf element and the atomic percent of C element is 100%.

2. Wide temperature range self-lubricating bearing according to claim 1, characterized in that the bearing base body (1) is made of bearing steel.

3. A method for manufacturing the wide temperature range self-lubricating bearing according to any one of claims 1-2, comprising the steps of:

step 1, preparing a microtexture (2) on the surface of a bearing substrate (1) by adopting a laser processing technology, wherein the laser power is 10-50W, the frequency is 10-20kHz, and the scanning speed is 5-300 mm/s; the width of the microtexture (2) is 10-200 μm, and the depth is 5-200 μm;

and 2, preparing a composite coating on the surface of the microtexture (2) by adopting a multi-arc ion plating and medium-frequency magnetron sputtering codeposition method to obtain the wide-temperature-range self-lubricating bearing.

4. The preparation method according to claim 3, wherein the step 2 specifically comprises:

step 21, opening the Ti target and the VZnN target, adjusting the working air pressure to be 0.5-2.5Pa, the bias voltage to be 100-300V, adjusting the current of the Ti target to be 50-160A, adjusting the current of the VZnN target to be 50-100A, and depositing a TiVZnN layer for 2-5 min;

step 22, starting MoTe₂Target, Hf target and C target, adjusting the working pressure to 0.5-2.0Pa, the bias pressure to 100-120V, and adjusting MoTe₂Depositing a MoTeHfC layer for 3-8min, wherein the target current is 80-120A, the Hf target current is 30-50A, and the C target current is 50-80A;

and 23, repeating the step 21 and the step 22, and alternately depositing a TiVZnN layer and a MoTeHfC layer to enable the total thickness of the composite coating to be a preset thickness, so as to obtain the wide-temperature-range self-lubricating bearing.

5. The method according to claim 4, wherein the predetermined thickness is 1 to 10 μm.

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