High-temperature-resistant engine valve body bush
By employing a multi-layer coating and support structure on the engine valve body bushing, the problem of traditional bushings being easily damaged in high-temperature environments has been solved, achieving high-temperature resistance, corrosion resistance, and wear resistance, thereby improving the engine's operational stability and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO BEILUN DEKAI AUTO PARTS CO LTD
- Filing Date
- 2025-07-14
- Publication Date
- 2026-05-19
AI Technical Summary
Traditional engine valve body bushings are prone to deformation and damage in high temperature, high pressure and corrosive environments. They lack heat resistance, corrosion resistance and wear resistance, which affects engine operation and lifespan and increases maintenance and replacement costs.
It adopts a multi-layer coating structure, including nickel-chromium alloy, cobalt-based alloy, silicon carbide, molybdenum alloy, ceramic fiber, aerogel and mica coating, combined with gray cast iron support layer and high-strength alloy steel layer, to enhance high temperature resistance, corrosion resistance and wear resistance.
It improves the high-temperature resistance of engine valve body bushings, extends service life, reduces wear, enhances working efficiency and structural stability, and reduces maintenance costs.
Smart Images
Figure CN224261011U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of engine valve body bushings, specifically relating to a high-temperature resistant engine valve body bushing. Background Technology
[0002] During engine operation, valve body bushings, as critical components, are subjected to high-temperature, high-pressure, and corrosive environments for extended periods. Traditional engine valve body bushings often suffer from insufficient heat resistance under high-temperature conditions, leading to deformation or damage, which in turn affects the normal operation and service life of the engine. Furthermore, due to their poor corrosion and wear resistance, their surfaces are easily corroded by external substances during long-term use, and internal friction with components such as the valve core also exacerbates wear. This not only reduces the bushing's efficiency but also increases maintenance and replacement costs. Utility Model Content
[0003] The purpose of this invention is to provide a high-temperature resistant engine valve body bushing, which solves the problem that traditional engine valve body bushings are prone to deformation and damage, corrosion and wear in high-temperature, high-pressure and corrosive environments due to insufficient heat resistance, corrosion resistance and wear resistance, which affects engine operation and lifespan and increases costs.
[0004] The specific technical solution adopted by this utility model is as follows:
[0005] A high-temperature resistant engine valve body bushing includes a base layer, the surface of which is provided with a nickel-chromium alloy coating, the surface of which is provided with a cobalt-based alloy coating, the surface of which is provided with a silicon carbide coating, the surface of which is provided with a molybdenum alloy coating, the surface of which is provided with a ceramic fiber coating, the surface of which is provided with an aerogel coating, and the surface of which is provided with a mica coating.
[0006] The present invention is further configured such that the base layer comprises a gray cast iron support layer and a high-strength alloy steel layer, wherein the gray cast iron support layer is located within the high-strength alloy steel layer, the high-strength alloy steel layer is located within the nickel-chromium alloy coating, the thickness of the gray cast iron support layer is 5 mm, and the thickness of the high-strength alloy steel layer is 3 mm.
[0007] The present invention is further configured such that the surface of the aerogel coating is provided with a fluorocarbon coating, the thickness of which is 0.15 mm.
[0008] The present invention is further configured such that the inner wall of the fluorocarbon coating is provided with a high-chromium cast iron coating, the thickness of which is 1.5 mm.
[0009] The present invention is further configured such that the inner wall of the high-chromium cast iron coating is provided with a molybdenum disulfide coating, the thickness of which is 0.1 mm.
[0010] The present invention is further configured such that the thickness of the nickel-chromium alloy coating is 0.4 mm, the thickness of the cobalt-based alloy coating is 0.3 mm, the thickness of the silicon carbide coating is 0.2 mm, the thickness of the molybdenum alloy coating is 0.3 mm, the thickness of the ceramic fiber coating is 0.4 mm, the thickness of the aerogel coating is 0.15 mm, and the thickness of the mica coating is 0.25 mm.
[0011] The technical effects achieved by this utility model are as follows:
[0012] This utility model's high-temperature resistant engine valve body bushing utilizes a combination of nickel-chromium alloy coating, cobalt-based alloy coating, silicon carbide coating, molybdenum alloy coating, ceramic fiber coating, aerogel coating, and mica coating to achieve strong heat insulation and high-temperature resistance, enabling it to operate stably in high-temperature environments. Furthermore, the combination of a gray cast iron support layer and a high-strength alloy steel layer provides a solid support foundation, ensuring the structural strength and stability of the engine valve body bushing and preventing deformation or damage when subjected to high temperatures and other working pressures.
[0013] The high-temperature resistant engine valve body bushing of this invention features a fluorocarbon coating, which gives the surface of the engine valve body bushing strong corrosion resistance, thus protecting the surface from external environmental erosion and extending the service life of the engine valve body bushing. Simultaneously, a high-chromium cast iron coating provides the inner wall of the engine valve body bushing with strong wear resistance, and a molybdenum disulfide coating reduces the friction between the engine valve body bushing and the valve core, making the inner wall of the engine valve body bushing less prone to wear and improving its service life and working efficiency. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the base layer in this utility model;
[0016] Figure 3 This is a three-dimensional view of the structure of this utility model.
[0017] The attached diagram lists the components represented by each number as follows:
[0018] 1. Base layer; 101. Gray cast iron support layer; 102. High-strength alloy steel layer; 2. Nickel-chromium alloy coating; 3. Cobalt-based alloy coating; 4. Silicon carbide coating; 5. Molybdenum alloy coating; 6. Ceramic fiber coating; 7. Aerogel coating; 8. Mica coating; 9. Fluorocarbon coating; 10. High-chromium cast iron coating; 11. Molybdenum disulfide coating. Detailed Implementation
[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0021] like Figures 1 to 2 As shown, the high-temperature resistant engine valve body bushing includes a base layer 1, a nickel-chromium alloy coating 2 on the surface of the base layer 1, a cobalt-based alloy coating 3 on the surface of the nickel-chromium alloy coating 2, a silicon carbide coating 4 on the surface of the cobalt-based alloy coating 3, a molybdenum alloy coating 5 on the surface of the silicon carbide coating 4, a ceramic fiber coating 6 on the surface of the molybdenum alloy coating 5, an aerogel coating 7 on the surface of the ceramic fiber coating 6, and a mica coating 8 on the surface of the aerogel coating 7.
[0022] The base layer 1 includes a gray cast iron support layer 101 and a high-strength alloy steel layer 102. The gray cast iron support layer 101 is located inside the high-strength alloy steel layer 102, and the high-strength alloy steel layer 102 is located inside the nickel-chromium alloy coating 2. The thickness of the gray cast iron support layer 101 is 5 mm, and the thickness of the high-strength alloy steel layer 102 is 3 mm.
[0023] The thickness of the nickel-chromium alloy coating 2 is 0.4 mm, the thickness of the cobalt-based alloy coating 3 is 0.3 mm, the thickness of the silicon carbide coating 4 is 0.2 mm, the thickness of the molybdenum alloy coating 5 is 0.3 mm, the thickness of the ceramic fiber coating 6 is 0.4 mm, the thickness of the aerogel coating 7 is 0.15 mm, and the thickness of the mica coating 8 is 0.25 mm.
[0024] It should be noted that the gray cast iron support layer 101 is located inside the high-strength alloy steel layer 102. The two form an integrated support structure through metallurgical bonding or mechanical fitting. The gray cast iron support layer 101 provides a solid support foundation for the engine valve body bushing, ensuring the structural strength of the engine valve body bushing and making it less prone to deformation when subjected to high temperature and other working pressures. At the same time, the high-strength alloy steel layer 102 further enhances the strength and stability of the base layer 1, and together with the gray cast iron support layer 101, provides reliable support for the engine valve body bushing, ensuring that the engine valve body bushing remains stable in complex working environments.
[0025] The outer surface of the high-strength alloy steel layer 102 is directly covered with a nickel-chromium alloy coating 2. Metallurgical bonding is achieved through thermal spraying (such as plasma spraying) or electroplating processes, so that the nickel-chromium alloy adheres tightly to the metal surface. The nickel-chromium alloy coating 2 has good high-temperature resistance and can protect the base layer 1 in high-temperature environments.
[0026] The outer surface of the nickel-chromium alloy coating 2 is covered with a cobalt-based alloy coating 3 by a supersonic spraying process. The high-temperature alloying components of the cobalt-based alloy form chemical bonds with the nickel-chromium alloy, enhancing the bonding force between the coatings. The cobalt-based alloy coating 3 has excellent high-temperature resistance and can maintain good mechanical properties under high-temperature conditions, further improving the high-temperature resistance of the engine valve body bushing and reducing damage caused by high temperature.
[0027] The surface of the cobalt-based alloy coating 3 is coated with a silicon carbide coating 4 by chemical vapor deposition (CVD) or physical vapor deposition (PVD). The silicon carbide coating 4 has good high temperature resistance, which further improves the high temperature resistance of the engine valve body bushing.
[0028] The outer surface of the silicon carbide coating 4 is covered with a molybdenum alloy coating 5 by powder metallurgy sintering or electric arc spraying. The molybdenum alloy coating 5 has good high temperature resistance and can maintain stable performance in high temperature environments, further improving the high temperature resistance of the engine valve body bushing.
[0029] The surface of the molybdenum alloy coating 5 is prepared with a ceramic fiber coating 6 by sol-gel method or electrospinning process. The ceramic fiber and the surface of the molybdenum alloy are combined through mechanical interlocking and chemical adsorption to form a porous heat insulation layer. The ceramic fiber coating 6 has excellent heat insulation performance, which can effectively prevent heat transfer, reduce the temperature of the engine valve body bushing, and enable the engine valve body bushing to work stably in high temperature environment.
[0030] The outer surface of the ceramic fiber coating 6 is coated with an aerogel coating 7 by dip coating or spray coating. The nanoporous structure of the aerogel fills the gaps between the ceramic fibers to form a heat insulation layer with ultra-low thermal conductivity. The aerogel coating 7 is a high-efficiency heat insulation material with extremely low thermal conductivity, which can further improve the heat insulation performance of the engine valve body bushing.
[0031] The surface of the aerogel coating 7 is covered with a mica coating 8 by a scraping or roller coating process. The mica coating 8 has good heat insulation and high temperature resistance properties, which can protect the surface of the engine valve body bushing and prevent it from being corroded by high temperature and external environment.
[0032] like Figures 1 to 3 As shown, the surface of the aerogel coating 7 is provided with a fluorocarbon coating 9, the thickness of which is 0.15 mm. The inner wall of the fluorocarbon coating 9 is provided with a high-chromium cast iron coating 10, the thickness of which is 1.5 mm. The inner wall of the high-chromium cast iron coating 10 is provided with a molybdenum disulfide coating 11, the thickness of which is 0.1 mm.
[0033] It should be noted that the outer surface of the aerogel coating 7 is coated with a fluorocarbon coating 9 by a spraying process. The fluorocarbon bonds in the fluorocarbon resin form a physical coating with the aerogel surface, which improves the surface corrosion resistance and hydrophobicity. Through the fluorocarbon coating 9, the surface of the engine valve body bushing has strong corrosion resistance and can protect the surface of the engine valve body bushing from the erosion of the external environment.
[0034] The inner wall of the fluorocarbon coating 9 is covered with a high-chromium cast iron coating 10 by centrifugal casting or welding. The carbide particles of the high-chromium cast iron form a mechanical lock with the edge of the fluorocarbon coating 9, which enhances the wear resistance of the inner wall. The high-chromium cast iron coating 10 gives the inner wall of the engine valve body bushing strong wear resistance, enabling it to withstand the friction of components such as the valve core, reduce wear, and improve the service life of the engine valve body bushing.
[0035] The inner wall of the high-chromium cast iron coating 10 is coated or sintered with a molybdenum disulfide coating 11. The layered crystal structure of molybdenum disulfide is embedded in the micro-pits on the surface of the high-chromium cast iron to form a solid lubricating film, which reduces the coefficient of friction. The molybdenum disulfide coating 11 is a good solid lubricant that can reduce the friction between the engine valve body bushing and the valve core, reduce friction loss, and improve the working efficiency of the engine valve body bushing.
[0036] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.
Claims
1. A high-temperature resistant engine valve body bushing, characterized in that: The substrate includes a base layer (1), the surface of which is provided with a nickel-chromium alloy coating (2), the surface of which is provided with a cobalt-based alloy coating (3), the surface of which is provided with a silicon carbide coating (4), the surface of which is provided with a molybdenum alloy coating (5), the surface of which is provided with a ceramic fiber coating (6), the surface of which is provided with an aerogel coating (7), and the surface of which is provided with a mica coating (8).
2. The high-temperature resistant engine valve body bushing according to claim 1, characterized in that: The base layer (1) includes a gray cast iron support layer (101) and a high-strength alloy steel layer (102). The gray cast iron support layer (101) is located inside the high-strength alloy steel layer (102), and the high-strength alloy steel layer (102) is located inside the nickel-chromium alloy coating (2). The thickness of the gray cast iron support layer (101) is 5 mm, and the thickness of the high-strength alloy steel layer (102) is 3 mm.
3. The high-temperature resistant engine valve body bushing according to claim 1, characterized in that: The aerogel coating (7) has a fluorocarbon coating (9) on its surface, and the thickness of the fluorocarbon coating (9) is 0.15 mm.
4. The high-temperature resistant engine valve body bushing according to claim 3, characterized in that: The inner wall of the fluorocarbon coating (9) is provided with a high-chromium cast iron coating (10), the thickness of which is 1.5 mm.
5. The high-temperature resistant engine valve body bushing according to claim 4, characterized in that: The inner wall of the high-chromium cast iron coating (10) is provided with a molybdenum disulfide coating (11), the thickness of which is 0.1 mm.
6. The high-temperature resistant engine valve body bushing according to claim 1, characterized in that: The thickness of the nickel-chromium alloy coating (2) is 0.4 mm, the thickness of the cobalt-based alloy coating (3) is 0.3 mm, the thickness of the silicon carbide coating (4) is 0.2 mm, the thickness of the molybdenum alloy coating (5) is 0.3 mm, the thickness of the ceramic fiber coating (6) is 0.4 mm, the thickness of the aerogel coating (7) is 0.15 mm, and the thickness of the mica coating (8) is 0.25 mm.