CN210122587U - Nickel-based alloy surface high-temperature solid self-lubricating wear-resistant coating structure - Google Patents
Nickel-based alloy surface high-temperature solid self-lubricating wear-resistant coating structure Download PDFInfo
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- CN210122587U CN210122587U CN201920864563.3U CN201920864563U CN210122587U CN 210122587 U CN210122587 U CN 210122587U CN 201920864563 U CN201920864563 U CN 201920864563U CN 210122587 U CN210122587 U CN 210122587U
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Abstract
A high-temperature solid self-lubricating wear-resistant coating structure on the surface of a nickel-based alloy comprises a nickel-based alloy substrate, a bonding layer, a first composite gradient layer, a second composite gradient layer and a third composite gradient layer; the first composite gradient layer, the second composite gradient layer and the third composite gradient layer all contain three components of NiCr alloy, hard phase and lubricating phase; the content of the NiCr alloy in the first composite gradient layer, the second composite gradient layer and the third composite gradient layer is gradually reduced, the content of the hard phase in the first composite gradient layer, the second composite gradient layer and the third composite gradient layer is kept unchanged, and the content of the lubricating phase in the first composite gradient layer, the second composite gradient layer and the third composite gradient layer is gradually increased. According to the utility model discloses a nickel base alloy surface high temperature solid self-lubricating wear-resistant coating structure adopts compound gradient coating mode, can effectively reduce the thermal stress that the part produced at high temperature thermal cycle in-process, improves working life.
Description
Technical Field
The utility model relates to a coating structure, concretely relates to nickel base alloy surface high temperature solid self-lubricating wear-resistant coating structure.
Background
The brush seal adopted in the design and manufacture of advanced aeroengines and gas turbines is a contact seal, a seal gap can be kept unchanged after the rotating part is subjected to instantaneous large radial displacement, and the operating stability of the rotating part can be greatly improved and the oil consumption rate can be reduced due to 1/4-1/7 of the leakage rate labyrinth seal. The brush of the brush seal contacts the rotor shaft surface (race track) at a high relative friction rate in a high temperature gas environment and under high pressure conditions. Therefore, the surface of the rotor shaft, which is contacted by the bristles, needs to be sprayed with a high-temperature wear-resistant self-lubricating coating to ensure that the abrasion of the rotor shaft is reduced under a high-temperature gas environment and the abrasion amount of the bristles is reduced. The coating is required to have a low high-temperature friction coefficient and good wear resistance, to withstand the test of high temperature at the inlet and outlet of the combustion chamber of an aeroengine, and to have good high-temperature oxidation resistance, heat cycle resistance and other properties.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a nickel base alloy surface high temperature solid self-lubricating wear-resistant coating structure improves the thermal cycle resistance performance of coating.
According to the utility model discloses a nickel base alloy surface high temperature solid self-lubricating wear-resistant coating structure, including the nickel base alloy base member, from bottom to top in proper order from the surface of nickel base alloy base member is tie coat, first compound gradient layer, second compound gradient layer and third compound gradient layer; the first composite gradient layer, the second composite gradient layer and the third composite gradient layer all contain three components of NiCr alloy, hard phase and lubricating phase.
The content of the NiCr alloy in the first composite gradient layer, the second composite gradient layer and the third composite gradient layer is gradually reduced, the content of the hard phase in the first composite gradient layer, the content of the second composite gradient layer and the content of the lubricating phase in the third composite gradient layer are kept unchanged, and the content of the lubricating phase in the first composite gradient layer, the second composite gradient layer and the content of the lubricating phase in the third composite gradient layer are gradually increased.
In particular, the hard phase is Cr2C3。
In a specific case, wherein the lubricating phase is CaF2Or BaF2。
Preferably, the ratio of the thicknesses of the first composite gradient layer, the second composite gradient layer and the third composite gradient layer is 4:2: 1.
Preferably, the bonding layer, the first composite gradient layer, the second composite gradient layer and the third composite gradient layer are all prepared by adopting a plasma spraying process.
According to the utility model discloses a nickel base alloy surface high temperature solid self-lubricating wear-resistant coating structure adopts compound gradient coating mode, can effectively reduce the thermal stress that the part produced at high temperature thermal cycle in-process, improves working life.
Drawings
Fig. 1 is a schematic structural diagram of the high-temperature solid self-lubricating wear-resistant coating on the surface of the nickel-based alloy according to the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and examples. It should be understood by those skilled in the art that the following described embodiments are only illustrative of the present invention and are not intended to limit the same in any way.
Referring to fig. 1, according to the utility model discloses a nickel base alloy surface high temperature solid self-lubricating wear-resistant coating structure includes nickel base alloy base member 1, from 1 surface of nickel base alloy base member from up being tie coat 2, first compound gradient layer 3, the compound gradient layer of second 4 and the compound gradient layer of third 5 in proper order down.
The bonding layer 2 is made of NiCr alloy, and the first composite gradient layer 3, the second composite gradient layer 4 and the third composite gradient layer 5 all contain three components of NiCr alloy, hard phase and lubricating phase. The content of the NiCr alloy in the first composite gradient layer 3, the second composite gradient layer 4 and the third composite gradient layer 5 is gradually reduced, the content of the hard phase in the first composite gradient layer 3, the second composite gradient layer 4 and the third composite gradient layer 5 is kept unchanged, and the content of the lubricating phase in the first composite gradient layer 3, the second composite gradient layer 4 and the third composite gradient layer 5 is gradually increased.
Preferably, the volume fraction of the NiCr alloy in the first composite gradient layer 3, the second composite gradient layer 4, and the third composite gradient layer 5 is 50%, 30%, 10%, respectively. The volume fraction of the hard phase in the first composite gradient layer 3, the second composite gradient layer 4 and the third composite gradient layer 5 was 40%. The volume fractions of the lubricant phase in the first composite gradient layer 3, the second composite gradient layer 4 and the third composite gradient layer 5 were 10%, 30% and 50%, respectively. Through gradient change of the three components, the lower layer plays a role in enhancing the binding force, and the upper layer plays a role in gradually enhancing the wear-resistant self-lubricating function.
In one embodiment, the hard phase is Cr2C3The lubricating phase is CaF2Or BaF2。
In a preferred embodiment, the ratio of the thicknesses of the first composite gradient layer 3, the second composite gradient layer 4 and the third composite gradient layer 5 is 4:2: 1. In a specific embodiment, the thicknesses of the bonding layer 2, the first composite gradient layer 3, the second composite gradient layer 4 and the third composite gradient layer 5 are 0.2mm, 0.4mm, 0.2mm and 0.1mm, respectively. The gradient change of the thickness further enhances the bonding strength between the coating and the substrate and between the coatings of each layer.
In a specific case, the bonding layer 2, the first composite gradient layer 3, the second composite gradient layer 4 and the third composite gradient layer 5 are all prepared by a plasma spraying process.
The above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the claims of the present invention.
Claims (5)
1. A high-temperature solid self-lubricating wear-resistant coating structure on the surface of a nickel-based alloy is characterized by comprising a nickel-based alloy matrix, wherein a bonding layer, a first composite gradient layer, a second composite gradient layer and a third composite gradient layer are sequentially arranged on the surface of the nickel-based alloy matrix from bottom to top; the first composite gradient layer, the second composite gradient layer and the third composite gradient layer all contain three components of NiCr alloy, hard phase and lubricating phase;
the content of the NiCr alloy in the first composite gradient layer, the second composite gradient layer and the third composite gradient layer is gradually reduced, the content of the hard phase in the first composite gradient layer, the content of the second composite gradient layer and the content of the lubricating phase in the third composite gradient layer are kept unchanged, and the content of the lubricating phase in the first composite gradient layer, the second composite gradient layer and the content of the lubricating phase in the third composite gradient layer are gradually increased.
2. The high-temperature solid self-lubricating wear-resistant coating structure on the surface of the nickel-based alloy according to claim 1, wherein the hard phase is Cr2C3。
3. The high-temperature solid self-lubricating wear-resistant coating structure on the surface of the nickel-based alloy according to claim 1, wherein the lubricating phase is CaF2Or BaF2。
4. The high-temperature solid self-lubricating wear-resistant coating structure on the surface of the nickel-based alloy according to claim 1, wherein the thickness ratio of the first composite gradient layer to the second composite gradient layer to the third composite gradient layer is 4:2: 1.
5. The high-temperature solid self-lubricating wear-resistant coating structure on the surface of the nickel-based alloy according to claim 1, wherein the bonding layer, the first composite gradient layer, the second composite gradient layer and the third composite gradient layer are all prepared by a plasma spraying process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920864563.3U CN210122587U (en) | 2019-06-11 | 2019-06-11 | Nickel-based alloy surface high-temperature solid self-lubricating wear-resistant coating structure |
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| CN201920864563.3U CN210122587U (en) | 2019-06-11 | 2019-06-11 | Nickel-based alloy surface high-temperature solid self-lubricating wear-resistant coating structure |
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| CN210122587U true CN210122587U (en) | 2020-03-03 |
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| CN201920864563.3U Active CN210122587U (en) | 2019-06-11 | 2019-06-11 | Nickel-based alloy surface high-temperature solid self-lubricating wear-resistant coating structure |
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