Corrosion-resistant and high-temperature-resistant carbon-titanium-based plating film structure for vacuum drying equipment

Abstract

The utility model discloses a kind of corrosion-resistant high-temperature-resistant carbon titanium-based plating film structures for vacuum drying equipment, the carbon titanium-based plating film structure is arranged on the inner wall surface of vacuum drying equipment, the plating film structure includes first film layer, second film layer and third film layer;First film layer is directly connected with the inner wall surface of vacuum drying equipment;Second film layer is closely connected with the side of first film layer away from the inner wall surface of vacuum drying equipment;Third film layer is closely connected with the side of second film layer away from first film layer;First film layer is high-temperature-resistant layer;Second film layer is corrosion-resistant layer;Third film layer is self-cleaning layer, and each layer is connected by heat treatment under controllable temperature. The carbon titanium-based plating film structure is synergized by each layer, significantly improves the corrosion resistance of material in high-temperature and high-humidity environment, not only can effectively prevent the erosion of chloride ion and moisture to the stainless steel surface of drying box inner wall, but also can keep stable under high-temperature condition, comprehensively improve the performance and service life of equipment inside.

Description

Technical Field

[0001] This utility model belongs to the field of anti-corrosion materials technology, specifically relating to a corrosion-resistant and high-temperature resistant carbon-titanium-based coating structure for vacuum drying equipment. Background Technology

[0002] During the use of a vacuum drying oven, the internal environment is typically above room temperature and highly humid, which can prevent water vapor or water from escaping in time, leading to corrosion of the internal frame structure. Additionally, the vacuum drying process involves the volatilization of numerous gases (such as water vapor and alcohol), which can also corrode the internal structure of the oven over time. This corrosion not only shortens the oven's lifespan and reduces its airtightness but can also contaminate the samples stored inside. Therefore, the high-temperature, high-humidity, and corrosion-resistant properties of the internal materials of vacuum drying equipment are particularly important.

[0003] Although the internal materials of vacuum drying ovens are mostly made of stainless steel, and stainless steel has a certain degree of corrosion resistance, it is still susceptible to corrosion under long-term high temperature and high humidity conditions. Stainless steel has a protective film on its surface; once this film is damaged, the damaged area becomes the anode, and iron ions precipitate from the water droplets, initiating pitting corrosion. Corrosion damage to stainless steel is mostly localized, with the most common types being intergranular corrosion (9%), pitting corrosion (23%), and stress corrosion (49%). Intergranular corrosion is caused by Cr depletion at grain boundaries, leading to preferential corrosion in that area and eventually causing the grains to detach from the metal. During heat treatment at temperatures between 450℃ and 850℃, C and Cr easily form carbon-chromium compounds, and the Cr consumed at the grain boundaries cannot be replenished from the grains in time, resulting in Cr depletion in the grain boundary region, which is the key factor leading to intergranular corrosion. Pitting corrosion is a dangerous form of localized corrosion, characterized by small pits followed by rapid corrosion, which can lead to perforation in severe cases. It is a common type of corrosion in daily life. The main influencing factors of pitting corrosion are: 1. Cl... - Impact, Cl - The corrosion of stainless steel vacuum drying ovens is caused by several factors: 1. Localized damage to the passivation film, leading to preferential corrosion in those areas; 2. Temperature affects corrosion rate, with higher temperatures accelerating the process; 3. Surface contaminants hinder oxygen flow. In summary, the internal structure of stainless steel vacuum drying ovens is highly susceptible to corrosion under prolonged high-temperature and high-humidity conditions, which in turn affects the quality of stored samples and the lifespan of the vacuum drying equipment. Utility Model Content

[0004] To overcome the shortcomings of the existing technology, the present invention aims to provide a corrosion-resistant and high-temperature-resistant carbon-titanium-based coating structure for vacuum drying equipment. This carbon-titanium-based coating structure is specifically designed for closed and humid environments such as vacuum drying ovens. The coating structure consists of a high-temperature resistant layer, a corrosion-resistant layer, and a self-cleaning layer. These layers work synergistically to form a robust carbon-titanium-based composite film on the stainless steel surface, significantly improving the material's corrosion resistance in high-temperature and high-humidity environments. It not only effectively prevents chloride ions and moisture from corroding the stainless steel surface but also maintains stability under high-temperature conditions, thereby extending the service life of the vacuum drying oven, reducing maintenance frequency, ensuring the integrity of its internal structure and the safety of samples, and comprehensively improving the equipment's performance.

[0005] To achieve the above-mentioned objectives, this invention provides a corrosion-resistant and high-temperature-resistant carbon-titanium-based coating structure for vacuum drying equipment. The carbon-titanium-based coating structure is disposed on the inner wall surface of the vacuum drying equipment. The carbon-titanium-based coating structure includes a first film layer, a second film layer, and a third film layer, and each layer is connected by heat treatment at a controllable temperature. The first film layer is directly connected to the inner wall surface of the vacuum drying equipment. The second film layer is tightly connected to the side of the first film layer away from the inner wall surface of the vacuum drying equipment. The third film layer is tightly connected to the side of the second film layer away from the first film layer.

[0006] The first film layer is a high-temperature resistant layer, and its main component is a high-temperature alloy; the second film layer is a corrosion resistant layer, and its main components are fibrous titanium carbide nanoparticles, spherical silica powder and organic film-forming slurry; the third film layer is a self-cleaning layer, and its main components are silica and titanium dioxide.

[0007] Titanium carbide possesses unparalleled advantages over other reinforcing phases, including structural stability, high hardness, a small difference in thermal expansion coefficients with the titanium matrix, and mutual solubility. Therefore, it has become the most widely used reinforcement in titanium-based composite materials. Titanium carbide (TiC) ceramic powder is more suitable for use under high-temperature and high-corrosion working conditions than tungsten carbide (WC) ceramic powder, exhibiting extremely strong corrosion resistance. Titanium carbide ranks eighth among the world's ten highest-melting-point materials, with an oxidation resistance temperature reaching 1100℃ in air. It possesses excellent physicochemical properties, including a very high melting point, high hardness, and outstanding chemical stability, electrical and thermal conductivity, and high-temperature mechanical properties. Therefore, thin film structures made from titanium carbide materials can effectively alleviate functional failures caused by high temperature and humidity inside vacuum drying equipment, extending the service life of the drying equipment.

[0008] By adopting the aforementioned design scheme of corrosion-resistant and high-temperature-resistant carbon-titanium-based coating structure, a high-temperature resistant layer, a corrosion-resistant layer, and a self-cleaning layer are sequentially set on the inner surface of the vacuum drying equipment. As the names suggest, the high-temperature resistant layer and the corrosion-resistant layer mainly improve the internal materials' ability to withstand high temperatures, high humidity, and corrosion in humid and hot environments; while the self-cleaning layer ensures that the moisture evaporated from the product during drying in the vacuum drying equipment drips quickly and is collected in the bottom container, preventing corrosion and friction on the base material, thereby extending the service life of the vacuum drying equipment.

[0009] In the above technical solution, the first film layer is a high-temperature resistant layer that adheres closely to the inner wall of the vacuum drying oven. Its main components are high-temperature alloys (such as nickel-based carbides), with a nickel (Ni3Al, Ni3Ti, Ni3(Al·Ti)) content of 50%–60%, a chromium carbide content of 10%–20%, a titanium carbide content of 10%–15%, and a vanadium carbide content of 3%–10%. Chemically strengthened ceramic technology is adopted to allow the film layer to undergo ion exchange with the inner surface of the oven. After the reaction, it does not bend when subjected to external force and high temperature, and can maintain its original shape and object shape, thereby improving the hardness and high-temperature resistance of the inner wall. The high-temperature resistance of the first film layer can reach above 1300℃, and the thickness is controlled within 100μm.

[0010] Furthermore, the second film layer is a corrosion-resistant layer, mainly composed of fibrous titanium carbide nanoparticles, spherical silica powder, and commercially available organic film-forming slurries (such as phenolic resin and polyurethane substances). The raw materials are uniformly mixed. This film layer is deposited by means of magnetron sputtering or electrospinning and then heat-treated. The molar ratio of titanium carbide nanoparticles to silica powder is 5 to 10:1, and the mass ratio of all powders to film-forming slurry is 1:(20 to 50). The thickness of the second film layer is controlled at 50 to 200 μm.

[0011] Furthermore, the third film layer is a self-cleaning layer, a nanofilm layer composed of a mixture of silicon dioxide and titanium dioxide. This film has a superhydrophilic structure and good dust resistance, and does not rely on sunlight exposure, so it can still perform its self-cleaning function in a completely dark environment. The thickness of the third film layer is controlled between 10 and 100 μm, and the planar contact angle is about 135° to 150°.

[0012] Furthermore, the total thickness of the three films—the first, second, and third films—does not exceed 400 μm to avoid cracking under high temperature and humidity conditions. The entire coating structure can be used for extended periods under high temperature and humidity conditions with minimal impact on the inner wall of the vacuum oven, thereby extending the service life of the vacuum drying oven.

[0013] Furthermore, the film layer of the corrosion-resistant and high-temperature-resistant carbon-titanium-based coating structure used in the vacuum drying equipment is constructed sequentially from the inside out. Specifically, the first film layer, the second film layer, and the third film layer are constructed sequentially on the inner wall surface of the vacuum drying oven.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] ① This utility model provides a corrosion-resistant and high-temperature-resistant carbon-titanium-based coating structure for vacuum drying equipment, specifically designed for enclosed, humid, and hot environments such as vacuum drying ovens. It aims to significantly improve the corrosion resistance of the equipment's inner wall under high-temperature and high-humidity conditions, thereby increasing its service life. The coating structure consists of three layers: the first layer is a high-temperature resistant layer, which effectively enhances the high-temperature resistance of the inner wall; the second layer is a corrosion-resistant layer, which resists corrosion from gases or liquids generated during product drying under high-temperature and high-humidity conditions; and the third layer is a self-cleaning layer, which reduces or avoids erosion and friction caused by excessive moisture or other liquids on the inner wall surface.

[0016] ② By forming a robust carbon-titanium-based composite film on the stainless steel surface, the synergistic effect of each layer not only effectively prevents corrosion from chloride ions and moisture but also maintains stability under high-temperature conditions. This coating structure significantly improves the corrosion of the inner wall of the vacuum drying oven, enabling it to operate stably for a long time in high-temperature, high-humidity, and highly corrosive environments. This greatly extends the service life of the inner wall, while reducing contamination of internally stored samples, ensuring the integrity of the equipment's internal structure and the safety of the samples.

[0017] ③ In addition, the carbon-titanium based coating structure uses low-cost raw materials, is easy to construct, and has significant economic benefits; its excellent moisture resistance, heat resistance and corrosion resistance provide a reliable guarantee for the long-term stable operation of vacuum drying equipment, and is especially suitable for application scenarios with high requirements for equipment service life and sample safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a vacuum drying device;

[0019] Figure 2 This is a cross-sectional view of a corrosion-resistant and high-temperature-resistant carbon-titanium-based coating structure for a vacuum drying equipment according to this utility model.

[0020] In the figure: 1-vacuum drying oven; 2-inner wall; 3-carbon titanium-based coating structure; 31-first film layer; 32-second film layer; 33-third film layer. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model.

[0022] Specific embodiments of the present invention are disclosed herein as needed; however, it should be understood that the embodiments disclosed herein are merely examples of the present invention that can be implemented in various alternative forms. In the following description, various operating parameters and components are described in several contemplated embodiments. These specific parameters and components are provided as examples in this specification and are not intended to be limiting.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] Example

[0025] This utility model discloses a corrosion-resistant and high-temperature-resistant carbon-titanium-based coating structure for vacuum drying equipment, such as... Figure 1-2 As shown, a corrosion-resistant and high-temperature-resistant carbon-titanium-based coating structure 3 for vacuum drying equipment is disposed on the surface of the inner wall 2 of vacuum drying equipment 1; the carbon-titanium-based coating structure 3 includes a first film layer 31, a second film layer 32 and a third film layer 33, and each layer is connected by heat treatment at a controllable temperature; the first film layer 31 is directly connected to the surface of the inner wall 2 of vacuum drying equipment 1; the second film layer 32 is tightly connected to the side of the first film layer 31 away from the surface of the inner wall 2 of vacuum drying equipment 1; the third film layer 33 is tightly connected to the side of the second film layer 32 away from the first film layer 31.

[0026] The first film layer 31 is a high-temperature resistant layer, and its main component is a high-temperature alloy; the second film layer 32 is a corrosion resistant layer, and its main raw materials are fibrous titanium carbide nanoparticles, spherical silica powder and organic film-forming slurry; the third film layer 33 is a self-cleaning layer, and its main components are silica and titanium dioxide.

[0027] Specifically, by adopting the above structural design, a high-temperature resistant layer, a corrosion-resistant layer, and a self-cleaning layer are sequentially arranged on the inner surface of the vacuum drying equipment 1. The high-temperature resistant layer and the corrosion-resistant layer primarily improve the internal materials' resistance to high temperatures, high humidity, and corrosion in humid and hot environments. The self-cleaning layer allows the moisture and other liquids evaporated from the product during drying in the vacuum drying equipment 1 to quickly drip and collect in the bottom container, thus minimizing the impact on the base material from corrosion or friction, thereby extending the service life of the vacuum drying equipment 1.

[0028] In one specific embodiment, each layer is connected by heat treatment at a controlled temperature to enhance the tightness of the connection between the functional layers.

[0029] In one specific embodiment, the first film layer 31 is a carbide-nickel base layer.

[0030] In one specific embodiment, the first film layer 31 is closely attached to the inner wall 2 of the vacuum drying equipment 1. Its main component is a high-temperature alloy, including the following components by mass percentage: 60% nickel alloy Ni3Al, 20% chromium carbide, 10% titanium carbide, and 10% vanadium carbide. It does not bend when exposed to external force and high temperature, and maintains the original shape of the object, thereby improving the hardness and high temperature resistance of the inner wall 2. The high temperature resistance of the first film layer 31 can reach more than 1300℃.

[0031] In one specific embodiment, the second film layer 32 is a fibrous nano-titanium carbide-silicon dioxide layer.

[0032] In one specific embodiment, the second film layer 32 is formed by uniformly mixing fibrous titanium carbide nanoparticles, silica powder, and commercially available organic film-forming slurry (polyurethane-based substances). This film layer is deposited by means of magnetron sputtering or electrospinning and then heat-treated. The molar ratio of fibrous titanium carbide nanoparticles to silica powder is 10:1, and the mass ratio of powder to film-forming slurry is 1:50.

[0033] In one specific embodiment, the third film layer 33 is a silicon dioxide-titanium dioxide nanofilm layer.

[0034] In one specific embodiment, the third film layer 33 is a nanofilm layer composed of silicon dioxide and titanium dioxide. The surface of this film has a superhydrophilic structure and good dust resistance. It does not rely on sunlight and can also play a self-cleaning role in a completely dark environment. The planar contact angle is 150°.

[0035] In one specific embodiment, the total thickness of the corrosion-resistant and high-temperature-resistant carbon-titanium-based coating structure 3 used in the vacuum drying equipment is 320 μm, which avoids cracking under high temperature and high humidity conditions; wherein, the thickness of the first film layer 31 is 90 μm; the thickness of the second film layer 32 is 150 μm; and the thickness of the third film layer 33 is 80 μm.

[0036] In one specific embodiment, the film layers are constructed sequentially from the inside out, in the order of first film layer 31, second film layer 32, and third film layer 33. The entire coating structure 3 can be used for a long time under high temperature and high humidity conditions with virtually no impact on the inner wall 2, thereby extending the service life of the vacuum drying equipment.

[0037] The coating structure of this utility model embodiment can achieve at least the following effects: increase the high-temperature resistance of the inner wall of the vacuum drying equipment; increase the corrosion resistance of the inner wall of the vacuum drying equipment; increase the self-cleaning ability of the inner wall of the vacuum drying equipment; and allow the entire coating structure to be used for a long time in a humid and hot environment without corrosion. In summary, it reduces the wear and tear on the inner wall of the vacuum drying equipment, increases the service life of the vacuum drying equipment, and can significantly save on maintenance costs during use.

[0038] It should be noted that the components or steps in the above embodiments can be interchanged, substituted, added, or deleted. Therefore, the combinations formed by these reasonable permutations and transformations should also fall within the protection scope of this utility model, and the protection scope of this utility model should not be limited to the above embodiments.

[0039] The above are exemplary embodiments disclosed in this utility model. The order of the disclosed embodiments is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of this utility model (including the claims) is limited to these examples. Various changes and modifications can be made without departing from the scope defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this utility model may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0040] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the framework of the present invention, technical features of the above embodiments or different embodiments can also be combined, and many other variations of different aspects of the present invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A corrosion-resistant and high-temperature-resistant carbon-titanium-based coating structure for vacuum drying equipment, characterized in that, The carbon-titanium based coating structure (3) is disposed on the surface of the inner wall (2) of the vacuum drying equipment; The carbon-titanium based coating structure (3) includes a first film layer (31), a second film layer (32) and a third film layer (33), and each layer is connected by heat treatment at a controllable temperature; The first membrane layer (31) is directly connected to the surface of the inner wall (2) of the vacuum drying equipment; the second membrane layer (32) and the first membrane layer (31) are tightly connected on the side away from the surface of the inner wall (2) of the vacuum drying equipment; the third membrane layer (33) and the second membrane layer (32) are tightly connected on the side away from the first membrane layer (31); The first film layer (31) is a high temperature resistant layer; the second film layer (32) is a corrosion resistant layer; and the third film layer (33) is a self-cleaning layer.

2. The carbon-titanium based coating structure according to claim 1, characterized in that, The first film layer (31) has a high temperature resistance of over 1300℃ and a thickness controlled within 100 μm.

3. The carbon-titanium based coating structure according to claim 1, characterized in that, The second film layer (32) is a film layer with a thickness of 50~200 μm formed by magnetron sputtering or electrospinning followed by heat treatment.

4. The carbon-titanium based coating structure according to claim 1, characterized in that, The third film layer (33) has a thickness of 10~100μm and a planar contact angle of 135°~150°.

5. The carbon-titanium based coating structure according to claim 1, characterized in that, The total thickness of the three membrane layers (first, second, and third) does not exceed 400 μm.

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