Method for improving hole sealing effect of DM-4000 hole sealing agent on AT13 ceramic coating through temperature control and ultrasonic assistance

Abstract

The invention discloses a method for improving the hole sealing effect of a DM-4000 hole sealing agent on an AT13 ceramic coating through temperature control and ultrasonic assistance. According to the method, the environment temperature is controlled to range from 40 DEG C to 60 DEG C in the hole sealing process, meanwhile, an ultrasonic-assisted method is used, the hole sealing effect of DM-4000 (Dura-Metal Sealer 4000) on an AT13 (Al2O3-13% TiO2) ceramic coating is improved, and the hole sealing effect is improved. Under the optimal hole sealing parameters (the environment temperature is 50 DEG C), the maximum hole sealing depth can be 500 microns, and the overall porosity is reduced from 2.71% to 2.03%. The method is simple in process, low in cost and suitable for large-scale hole sealing requirements.

Description

Technical Field

[0001] The invention belongs to the field of surface engineering and coating technology, and particularly relates to a method for improving the sealing effect of a DM-4000 sealing agent on an AT13 ceramic coating through temperature control and ultrasound assistance. Background Art

[0002] AT13 ceramic coating, due to its excellent hardness, wear resistance, high temperature resistance and good insulation properties, has shown great value in the application of protective and functional coatings in the fields of aerospace, energy, chemical industry, machinery, etc. However, the existing preparation process of AT13 ceramic coating, such as thermal spraying, often inevitably forms a certain number of pores, microcracks and incompletely melted particles inside and on the surface of the coating. The presence of these microscopic defects significantly affects the overall performance of the coating: (1) Decreased corrosion resistance: The pores and cracks in the coating provide a permeation channel for corrosive media (such as acid, alkali, salt solution or high-temperature gas), allowing the corrosive media to directly contact the substrate material or the inside of the coating, accelerating the corrosion and failure of the material. (2) Decreased wear resistance: Pores and microcracks easily become stress concentration points or sources of wear debris during the wear process, making the coating more prone to peeling or wear, shortening its service life. In order to improve the performance of AT13 ceramic coating, sealing treatment is a common and effective method. DM-4000 sealing agent is a chemical treatment agent widely used to improve the performance of ceramic coatings. Its core function is to fill microscopic defects such as pores and microcracks within the coating, thereby significantly improving the coating's corrosion resistance and wear resistance, thereby enhancing coating reliability and extending its service life. However, when DM-4000 is applied to AT13 ceramic coatings, problems still exist, such as unsatisfactory pore sealing, complex processes, and high costs.

[0003] In existing technologies, researchers have attempted to improve the penetration of the DM-4000 sealer by modifying the coating surface, but this affects the mechanical properties of the coating surface and increases production time and cost. Other researchers have also incorporated other sealers, such as DICHTOL WFT#1532, into DM-4000. However, this addition can easily alter the physical and chemical properties of DM-4000, thereby affecting the sealing effect. Therefore, there is an urgent need to develop a low-cost, highly stable DM-4000 sealing technology for AT13 ceramic coatings that can maximize the preservation of the coating's original properties. Summary of the Invention

[0004] To address the shortcomings of existing technologies, a method has been developed to enhance the sealing effect of DM-4000 sealant on AT13 ceramic coatings through temperature control and ultrasound assistance. This method aims to optimize the sealing effect of DM-4000 on AT13 ceramic coatings by controlling the ambient temperature and applying ultrasonic vibrations during sealing. This method can effectively increase the penetration depth of DM-4000, optimize the sealing effect, and effectively reduce the coating porosity, thereby improving the corrosion resistance and lifespan of the AT13 ceramic coating.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] S1: Using AT13 powder with a particle size of 45-75 μm as the raw material, an AT13 ceramic coating was prepared on the substrate by plasma spraying. The spraying parameters included: current 610A, argon flow rate 35 nlpm, hydrogen flow rate 8 nlpm, and spraying distance 100 mm. The obtained AT13 ceramic coating had a thickness of 550 μm and a porosity of 2.71%.

[0007] S2: Using the ultrasound-assisted method, the AT13 ceramic coating sample was immersed in a beaker filled with DM-4000 sealing agent and placed in an ultrasonic cleaning machine for sealing. The sealing parameters included: sealing temperature 40-60°C, immersion time 8 minutes, and ultrasonic frequency 40kHz. After sealing, the sample was removed and the surface was wiped clean.

[0008] S3: The sealed AT13 ceramic coating was placed in a drying oven and dried at 80° C. for 48 h.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The present invention significantly improves the sealing effect of DM-4000 sealer on AT13 ceramic coating by adopting an ultrasonic-assisted sealing process combined with a specific temperature. Under preferred conditions (ambient temperature of 50°C), the porosity of the obtained AT13 ceramic coating is reduced from the initial 2.71% to 2.03%, indicating that the pores are effectively filled. This method can effectively promote the penetration of the sealer into the pores inside the coating. The suitable temperature improves the fluidity of the DM-4000 sealer, making it easier to enter smaller pores. Ultrasonic vibration can break the tiny bubbles in the coating and increase the penetration channel of the sealer. The high-temperature drying treatment after the sealing is completed ensures that the sealer is fully solidified inside the coating, forming a stable and dense sealing layer, which effectively blocks the channel for corrosive media to invade the coating. Therefore, the present invention not only optimizes the sealing process, but also is expected to improve the corrosion resistance and overall service life of the AT13 ceramic coating, providing an effective and reliable process method for obtaining high-performance and long-life AT13 protective coatings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the cross-sectional morphology of the AT13 ceramic coating obtained in Examples 1-3 of the present invention.

[0012] Figure 2 3 is a Si element distribution diagram of the cross section of the AT13 ceramic coating obtained in Examples 1-3 of the present invention. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0014] Example 1

[0015] Step S1: Using AT13 powder with a particle size of 45-75 μm as a raw material, an AT13 ceramic coating was prepared on a 304 stainless steel substrate (diameter 20 mm, thickness 1.5 mm) by plasma spraying. The spraying parameters included: current 610 A, argon flow rate 35 nlpm, hydrogen flow rate 8 nlpm, and spraying distance 100 mm. The obtained AT13 ceramic coating had a thickness of 550 μm and a porosity of 2.71%.

[0016] Step S2: Using an ultrasonic-assisted method, the AT13 ceramic coating sample was immersed in a beaker containing DM-4000 sealing agent and placed in an ultrasonic cleaning machine for sealing. The sealing parameters included: sealing temperature of 40°C, immersion time of 8 minutes, and ultrasonic frequency of 40 kHz. After sealing, the sample was removed and the surface was wiped clean.

[0017] Step S3: The sealed AT13 ceramic coating was placed in a drying oven and dried at 80° C. for 48 hours to obtain an AT13 ceramic coating with a porosity of 2.03%.

[0018] Figure 1 The figure corresponding to "40°C" is the cross-sectional morphology of the AT13 ceramic coating obtained in Example 1 of the present invention, with a porosity of 2.11%.

[0019] Figure 2 The corresponding figure at "40°C" is the Si element distribution diagram of the cross section of the AT13 ceramic coating obtained in Example 1 of the present invention, and the penetration depth of the sealing agent is about 450 μm.

[0020] Example 2

[0021] Step S1: Using AT13 powder with a particle size of 45-75 μm as a raw material, an AT13 ceramic coating was prepared on a 304 stainless steel substrate (diameter 20 mm, thickness 1.5 mm) by plasma spraying. The spraying parameters included: current 610 A, argon flow rate 35 nlpm, hydrogen flow rate 8 nlpm, and spraying distance 100 mm. The obtained AT13 ceramic coating had a thickness of 550 μm and a porosity of 2.71%.

[0022] Step S2: Using an ultrasonic-assisted method, the AT13 ceramic coating sample was immersed in a beaker containing DM-4000 sealing agent and placed in an ultrasonic cleaning machine for sealing. The sealing parameters included: sealing temperature of 40°C, immersion time of 8 minutes, and ultrasonic frequency of 40 kHz. After sealing, the sample was removed and the surface was wiped clean.

[0023] Step S3: The sealed AT13 ceramic coating was placed in a drying oven and dried at 80° C. for 48 hours to obtain an AT13 ceramic coating with a porosity of 2.03%.

[0024] Figure 1 The figure corresponding to “50° C.” is the cross-sectional morphology of the AT13 ceramic coating obtained in Example 2 of the present invention, with a porosity of 2.03%.

[0025] Figure 2 The graph corresponding to “50° C.” is a Si element distribution diagram of the cross section of the AT13 ceramic coating obtained in Example 2 of the present invention, and the penetration depth of the sealing agent is approximately 500 μm.

[0026] Example 3

[0027] Step S1: Using AT13 powder with a particle size of 45-75 μm as a raw material, an AT13 ceramic coating was prepared on a 304 stainless steel substrate (diameter 20 mm, thickness 1.5 mm) by plasma spraying. The spraying parameters included: current 610 A, argon flow rate 35 nlpm, hydrogen flow rate 8 nlpm, and spraying distance 100 mm. The obtained AT13 ceramic coating had a thickness of 550 μm and a porosity of 2.71%.

[0028] Step S2: Using an ultrasonic-assisted method, the AT13 ceramic coating sample was immersed in a beaker containing DM-4000 sealing agent and placed in an ultrasonic cleaning machine for sealing. The sealing parameters included: sealing temperature of 40°C, immersion time of 8 minutes, and ultrasonic frequency of 40 kHz. After sealing, the sample was removed and the surface was wiped clean.

[0029] Step S3: The sealed AT13 ceramic coating was placed in a drying oven and dried at 80° C. for 48 hours to obtain an AT13 ceramic coating with a porosity of 2.03%.

[0030] Figure 1 The figure corresponding to "60° C." is the cross-sectional morphology of the AT13 ceramic coating obtained in Example 3 of the present invention, with a porosity of 2.23%.

[0031] Figure 2 The corresponding figure at "60°C" is the Si element distribution diagram of the cross section of the AT13 ceramic coating obtained in Example 3 of the present invention, and the penetration depth of the sealing agent is about 300 μm.

Claims

1. A method for improving the sealing effect of DM-4000 sealing agent on AT13 ceramic coating by temperature control and ultrasound assistance, characterized in that: The following steps are involved: (1) Using AT13 powder as raw material, AT13 ceramic coating was prepared on the substrate by plasma spraying method. The spraying parameters included: current 610A, argon flow rate 35nlpm, hydrogen flow rate 8nlpm, and spraying distance 100mm to obtain AT13 ceramic coating; (2) The AT13 ceramic coating immersed in DM-4000 sealer was sealed using an ultrasonic-assisted method. The sealing parameters included: sealing temperature of 40-60°C, immersion time of 8 min, and the sample was removed after sealing, and the surface was wiped clean. (3) The sealed AT13 ceramic coating was placed in a drying oven and dried at 80°C for 48 hours.

2. The method according to claim 1, characterized in that The substrate used in step (1) is 304 stainless steel.

3. The method according to claim 1, characterized in that The frequency of the ultrasound-assisted method in step (2) is 40 kHz.

4. The method according to claim 1, wherein The AT13 ceramic coating immersed in the DM-4000 sealing agent in step (2) needs to be heated to 40-60° C. in advance.

5. An AT13 ceramic coating sealed according to the method of any one of claims 1 to 4.

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