A high-temperature oxidation resistant coating structure for bimetallic cylinder liners

Abstract

This utility model relates to the field of bimetallic cylinder liner technology, specifically to a high-temperature oxidation-resistant coating structure for a bimetallic cylinder liner. The utility model includes a cylinder liner substrate, which, in sequence outwards, comprises a transition bonding layer, an anti-oxidation buffer layer, a composite reinforcement layer, and a surface protection layer. The transition bonding layer improves the bonding strength between the cylinder liner substrate and subsequent coatings, allowing for better adhesion between each coating and the substrate and preventing peeling during use. The anti-oxidation buffer layer provides anti-oxidation properties, effectively blocking external oxygen from contacting the cylinder liner substrate and slowing down the oxidation process. It also acts as a buffer against thermal stress. The composite reinforcement layer imparts various properties to the cylinder liner, enhancing its performance under harsh conditions such as high temperature and friction. The surface protection layer protects the cylinder liner surface from corrosion, wear, and other damage, maintaining the surface smoothness and performance of the cylinder liner.

Description

Technical Field

[0001] This utility model relates to the field of bimetallic cylinder liner technology, and in particular to a high-temperature oxidation resistant coating structure for bimetallic cylinder liners. Background Technology

[0002] Bimetallic cylinder liners are engine cylinder liners made of two different metal materials. They combine the advantages of two or more metals to improve the overall performance and service life of the cylinder liner.

[0003] Traditional cylinder liner coatings have simple structures and weak adhesion between the coating and the substrate. Under complex operating conditions such as high temperature and vibration, the coating is prone to peeling. Once the coating peels off, the cylinder liner substrate is directly exposed to a high-temperature, oxidizing environment, accelerating oxidation and wear, significantly shortening the cylinder liner's service life, increasing equipment maintenance costs and downtime. Furthermore, some cylinder liners lack effective anti-oxidation and buffering designs. In high-temperature environments, oxygen easily reacts with the cylinder liner substrate to produce oxide scale, reducing the cylinder liner's performance and reliability. Moreover, during temperature changes, thermal stress caused by thermal expansion and contraction can damage the cylinder liner structure, further affecting its performance and lifespan. In addition, existing cylinder liner surface protection capabilities are limited, making them susceptible to corrosion and wear. This not only affects the cylinder liner's surface quality and smoothness but also leads to a decrease in its sealing performance and fitting accuracy, ultimately impacting the overall operating efficiency and stability of the equipment. Therefore, to address these issues, a high-temperature oxidation-resistant coating structure for bimetallic cylinder liners is proposed. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies where insufficient adhesion between the coating and the substrate leads to easy coating detachment under high temperature and vibration conditions, resulting in direct exposure of the cylinder liner substrate, accelerated oxidation and wear, and impacting the normal use and lifespan of the cylinder liner. Therefore, this invention proposes a high-temperature oxidation resistant coating structure for bimetallic cylinder liners.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-temperature oxidation-resistant coating structure for a bimetallic cylinder liner, comprising a cylinder liner substrate, characterized in that: the cylinder liner substrate comprises, outwardly, a transition bonding layer, an oxidation-resistant buffer layer, a composite reinforcement layer, and a surface protection layer.

[0006] The effects achieved by the above components are as follows: By setting a transition bonding layer, the bonding strength between the cylinder liner substrate and subsequent coatings can be improved, allowing each coating to bond better with the substrate, preventing coating peeling during use, and ensuring the integrity and stability of the coating structure. The anti-oxidation buffer layer has anti-oxidation properties, effectively blocking external oxygen from contacting the cylinder liner substrate, delaying the oxidation process. At the same time, it can act as a buffer when subjected to thermal stress, reducing damage to the coating and substrate caused by thermal expansion and contraction. The composite reinforcement layer can endow the cylinder liner with multiple properties, improving hardness, wear resistance, etc., enhancing the performance of the cylinder liner under harsh conditions such as high temperature and friction, and extending the service life of the cylinder liner. The surface protective layer can protect the cylinder liner surface, preventing corrosion, wear, and other damage, maintaining the smoothness and performance of the cylinder liner surface, further improving the cylinder liner's resistance to high temperature oxidation and comprehensive protection capabilities. It avoids the situation where the coating is easily peeled off under high temperature and vibration conditions due to insufficient bonding between the coating and the substrate, resulting in direct exposure of the cylinder liner substrate, accelerating oxidation and wear, and affecting the normal use and life of the cylinder liner.

[0007] Preferably, the transition bonding layer is a titanium aluminum nitride layer prepared by chemical vapor deposition.

[0008] The effect achieved by the above components is as follows: the titanium aluminum nitride transition bonding layer prepared by chemical vapor deposition can form a strong metallurgical bond between the coating and the cylinder liner substrate, effectively preventing element diffusion between the substrate metal and subsequent coating materials, ensuring the bonding strength between the coating and the substrate, preventing coating peeling, and providing a stable foundation for the entire coating structure.

[0009] Preferably, the antioxidant buffer layer is a composite ceramic layer, prepared by plasma spraying.

[0010] The effects achieved by the above components are as follows: the composite ceramic anti-oxidation buffer layer prepared by plasma spraying process has good anti-oxidation performance and buffering capacity, which can effectively block oxygen from contacting the cylinder liner substrate, delay oxidation, and at the same time, under the action of thermal stress, it can absorb and buffer stress, reducing damage to the cylinder liner.

[0011] Preferably, the composite reinforcement layer consists of a metal-ceramic layer and a gradient functional layer, wherein the metal-ceramic layer is prepared by a supersonic flame spraying process.

[0012] The effect achieved by the above components is as follows: the composite reinforcement layer composed of metal-ceramic layers prepared by supersonic flame spraying process combines the toughness of metal with the high hardness and wear resistance of ceramics, which can improve the overall mechanical properties of cylinder liners, enabling them to better resist wear and deformation under harsh working conditions such as high temperature and friction, and extend their service life.

[0013] Preferably, the surface protective layer is a rare earth-doped glass-ceramic coating, prepared using the sol-gel method.

[0014] The effects achieved by the above components are as follows: the rare earth-doped glass-ceramic surface protective layer prepared by the sol-gel method has good protective performance. Rare earth doping can improve the coating performance, effectively prevent the cylinder liner surface from being corroded and worn, form a continuous and dense protective film, reduce the surface friction coefficient, and improve the cylinder liner surface quality and operational stability.

[0015] Preferably, the transition bonding layer is used to form a metallurgical bond between the coating and the substrate, preventing elemental diffusion between the substrate metal and subsequent coating materials.

[0016] The effect achieved by the above components is as follows: by preventing the diffusion of elements between the base metal and the subsequent coating material through the bonding layer, the coating performance deterioration and adhesion reduction caused by element diffusion can be avoided, the stability of the interface between the coating and the substrate can be maintained, and the coating can effectively perform its functions such as high-temperature oxidation resistance for a long time.

[0017] Preferably, the alumina in the antioxidant buffer layer is used to form a dense alumina protective film at high temperatures.

[0018] The effect achieved by the above components is as follows: the alumina in the anti-oxidation buffer layer forms a dense alumina protective film at high temperature, which can tightly cover the cylinder liner surface, effectively isolate oxygen, greatly slow down the oxidation rate of the cylinder liner substrate, improve the cylinder liner's resistance to high-temperature oxidation, and protect the substrate material.

[0019] Preferably, the chromium carbide hard phase in the antioxidant buffer layer is used to provide high wear resistance.

[0020] The effect achieved by the above components is that the hard chromium carbide phase in the anti-oxidation buffer layer provides high wear resistance, which enables the cylinder liner to effectively resist friction and wear when it moves relative to the piston and other components, reduces dimensional changes and performance degradation caused by wear, and ensures long-term stable operation of the cylinder liner.

[0021] Preferably, the rare earth oxides in the surface protective layer are used to promote the flow and filling of the glass phase, repair microcracks and pores on the coating surface, and form a continuous and dense glassy protective film.

[0022] The effects achieved by the above components are as follows: rare earth oxides in the surface protective layer promote the flow and filling of the glassy phase, repair microcracks and pores on the coating surface, and form a continuous and dense glassy protective film. This reduces the surface friction coefficient, decreases frictional loss, and enhances the coating's corrosion resistance, further improving the surface protection performance of the cylinder liner.

[0023] In summary, the beneficial effects of this utility model are as follows: 1. In this utility model, by setting a transition bonding layer, the bonding strength between the cylinder liner substrate and subsequent coatings can be improved, allowing each coating to bond better with the substrate, preventing the coating from peeling off during use, and ensuring the integrity and stability of the coating structure. The anti-oxidation buffer layer has anti-oxidation properties, effectively blocking external oxygen from contacting the cylinder liner substrate, delaying the oxidation process. At the same time, it can act as a buffer when subjected to thermal stress, reducing damage to the coating and substrate caused by thermal expansion and contraction. The composite reinforcement layer can endow the cylinder liner with multiple properties, improving hardness, wear resistance, etc., enhancing the performance of the cylinder liner under harsh working conditions such as high temperature and friction, and extending the service life of the cylinder liner. The surface protective layer can protect the surface of the cylinder liner, preventing corrosion, wear, and other damage, maintaining the smoothness and performance of the cylinder liner surface, further improving the cylinder liner's resistance to high temperature oxidation and comprehensive protection capabilities. It avoids the situation where the coating is easily peeled off under working conditions such as high temperature and vibration due to insufficient bonding between the coating and the substrate, resulting in direct exposure of the cylinder liner substrate, accelerating oxidation and wear, and affecting the normal use and life of the cylinder liner. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 In this utility model Figure 1 Another structural diagram from a different angle; Figure 3 This is a cross-sectional view of the cylinder liner base in this utility model; Figure 4 This is a schematic diagram of the surface protective layer in this utility model.

[0025] Illustrations: 1. Cylinder liner substrate; 2. Coating layer; 3. Antioxidant buffer layer; 4. Composite reinforcement layer; 5. Surface protective layer. Detailed Implementation

[0026] Reference Figure 1-4As shown, this utility model provides a technical solution: a high-temperature oxidation-resistant coating structure for a bimetallic cylinder liner, comprising a cylinder liner substrate 1, and sequentially including a transition bonding layer 2, an anti-oxidation buffer layer 3, a composite reinforcement layer 4, and a surface protection layer 5 from the cylinder liner substrate 1 outwards. The transition bonding layer 2 is a titanium aluminum nitride layer prepared by chemical vapor deposition. The titanium aluminum nitride transition bonding layer 2 prepared by chemical vapor deposition can form a strong metallurgical bond between the coating and the cylinder liner substrate 1, effectively preventing element diffusion between the substrate metal and subsequent coating materials, ensuring the bonding strength between the coating and the substrate, preventing coating peeling, and providing a stable foundation for the entire coating structure. The anti-oxidation buffer layer 3 is a composite ceramic layer prepared by plasma spraying. The composite ceramic layer prepared by plasma spraying... The antioxidant buffer layer 3 possesses excellent antioxidant properties and buffering capacity, effectively blocking oxygen from contacting the cylinder liner substrate 1 and delaying oxidation. Simultaneously, under thermal stress, it absorbs and buffers stress, reducing damage to the cylinder liner. The composite reinforcement layer 4 consists of a metal-ceramic layer and a gradient functional layer. The metal-ceramic layer is prepared using a supersonic flame spraying process. The composite reinforcement layer 4, composed of metal-ceramic layers prepared by this process, combines the toughness of metal with the high hardness and wear resistance of ceramics, improving the overall mechanical properties of the cylinder liner. This allows it to better resist wear and deformation under harsh conditions such as high temperature and friction, extending its service life. The surface protective layer 5 is a rare-earth-doped glass-ceramic coating, prepared using the sol-gel method. The rare-earth-doped glass-ceramic surface protective layer 5 has excellent protective performance. Rare-earth doping improves coating performance, effectively preventing corrosion and wear on the cylinder liner surface, forming a continuous and dense protective film, reducing the surface friction coefficient, and improving the surface quality and operational stability of the cylinder liner. The transition bonding layer 2 is used to form a metallurgical bond between the coating and the substrate, preventing element diffusion between the substrate metal and subsequent coating materials. By preventing element diffusion between the substrate metal and subsequent coating materials through the transition bonding layer 2, the coating performance deterioration and adhesion reduction caused by element diffusion can be avoided, maintaining the stability of the coating-substrate interface and ensuring that the coating can effectively perform its functions such as high-temperature oxidation resistance for a long time. The alumina in the anti-oxidation buffer layer 3 is used to form a dense alumina protective film at high temperatures, providing anti-oxidation buffering. In layer 3, the alumina forms a dense protective film at high temperatures, tightly covering the cylinder liner surface, effectively isolating oxygen, greatly slowing down the oxidation rate of the cylinder liner substrate 1, improving the cylinder liner's resistance to high-temperature oxidation, and protecting the substrate material. The chromium carbide hard phase in the anti-oxidation buffer layer 3 provides high wear resistance, enabling the cylinder liner to effectively resist friction and wear when moving relative to components such as the piston, reducing dimensional changes and performance degradation caused by wear, and ensuring long-term stable operation of the cylinder liner. The rare earth oxides in the surface protective layer 5 promote the flow and filling of the glass phase, repairing microcracks and pores on the coating surface, forming a continuous and dense glassy protective film.It repairs microcracks and pores on the coating surface, forming a continuous and dense glassy protective film, reducing the surface friction coefficient, decreasing frictional losses, and enhancing the coating's corrosion resistance, thereby further improving the surface protection performance of the cylinder liner. Working principle: Cylinder liners face complex conditions such as high temperature, oxidation, and friction during operation. When external oxygen comes into contact with the cylinder liner, the anti-oxidation buffer layer 3 first plays a role. The alumina in this layer forms a dense alumina protective film at high temperature, tightly covering the cylinder liner surface, isolating oxygen, and slowing down the oxidation rate of the cylinder liner substrate 1. The chromium carbide hard phase in this layer provides the cylinder liner with high wear resistance, enabling it to effectively resist friction and wear when moving relative to components such as the piston. The transition bonding layer 2 is a titanium aluminum nitride layer, prepared by chemical vapor deposition, forming a metallurgical bond between the coating and the cylinder liner substrate 1, preventing element diffusion between the base metal and subsequent coating materials, ensuring the bonding strength between the coating and the substrate, and preventing the coating from peeling off under high temperature, vibration, and other conditions. The composite reinforcement layer 4 consists of a metal ceramic layer and a gradient layer. The functional layers consist of a metal-ceramic layer prepared using a supersonic flame spraying process, combining the toughness of metal with the high hardness and wear resistance of ceramics. This enhances the cylinder liner's resistance to wear and deformation under harsh conditions such as high temperature and friction, improving its overall mechanical properties. The surface protective layer 5 is a rare-earth-doped glass-ceramic coating prepared using the sol-gel method. The rare-earth oxides in the coating promote the flow and filling of the glass phase, repairing microcracks and pores on the coating surface, forming a continuous and dense glassy protective film. This reduces the surface friction coefficient, decreases frictional loss, and enhances corrosion resistance, further protecting the cylinder liner surface. The various coatings work synergistically to improve the bimetallic cylinder liner's high-temperature oxidation resistance and overall performance, extending its service life, through multiple aspects including oxidation resistance, wear resistance, enhanced adhesion, and surface protection. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A high-temperature oxidation resistant coating structure for a bimetallic cylinder liner, comprising a cylinder liner substrate (1), characterized in that: The cylinder liner substrate (1) includes, in sequence, a transition bonding layer (2), an anti-oxidation buffer layer (3), a composite reinforcement layer (4), and a surface protection layer (5).

2. The high-temperature oxidation resistant coating structure of a bimetallic cylinder liner according to claim 1, characterized in that: The transition bonding layer (2) is a titanium aluminum nitride layer prepared by chemical vapor deposition.

3. The high-temperature oxidation resistant coating structure of a bimetallic cylinder liner according to claim 1, characterized in that: The antioxidant buffer layer (3) is a composite ceramic layer, prepared by plasma spraying process.

4. The high-temperature oxidation resistant coating structure of a bimetallic cylinder liner according to claim 1, characterized in that: The composite reinforcement layer (4) consists of a metal-ceramic layer and a gradient functional layer, wherein the metal-ceramic layer is prepared by a supersonic flame spraying process.

5. The high-temperature oxidation resistant coating structure of a bimetallic cylinder liner according to claim 1, characterized in that: The surface protective layer (5) is a rare earth-doped glass-ceramic coating, prepared by the sol-gel method.

6. The high-temperature oxidation resistant coating structure of a bimetallic cylinder liner according to claim 2, characterized in that: The transition bonding layer (2) is used to form a metallurgical bond between the coating and the substrate, preventing elemental diffusion between the substrate metal and the subsequent coating material.

7. The high-temperature oxidation resistant coating structure of a bimetallic cylinder liner according to claim 1, characterized in that: The alumina in the antioxidant buffer layer (3) is used to form a dense alumina protective film at high temperatures.

8. The high-temperature oxidation resistant coating structure of a bimetallic cylinder liner according to claim 7, characterized in that: The chromium carbide hard phase in the antioxidant buffer layer (3) is used to provide high wear resistance.

9. The high-temperature oxidation resistant coating structure of a bimetallic cylinder liner according to claim 1, characterized in that: The rare earth oxides in the surface protective layer (5) are used to promote the flow and filling of the glass phase, repair microcracks and pores on the coating surface, and form a continuous and dense glassy protective film.

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