CN112126885A - Preparation method of high-temperature-resistant insulating coating of electromagnetic induction heating coil - Google Patents
Preparation method of high-temperature-resistant insulating coating of electromagnetic induction heating coil Download PDFInfo
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- CN112126885A CN112126885A CN202010832926.2A CN202010832926A CN112126885A CN 112126885 A CN112126885 A CN 112126885A CN 202010832926 A CN202010832926 A CN 202010832926A CN 112126885 A CN112126885 A CN 112126885A
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- Prior art keywords
- induction heating
- electromagnetic induction
- heating coil
- temperature
- insulating coating
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
Abstract
The invention discloses a preparation method of a high-temperature-resistant insulating coating of an electromagnetic induction heating coil, which relates to the technical field of surface engineering, and comprises the following steps: the preparation method comprises the steps of firstly polishing and cleaning the electromagnetic induction heating coil, carrying out sand blasting treatment on the surface of the coil, enabling the roughness of the surface of the coil to be Ra7.0-9.0 after the sand blasting treatment, and then preparing the high-temperature-resistant and wear-resistant insulating coating on the surface of the red copper coil after the sand blasting treatment by using an atmospheric plasma spraying technology.
Description
Technical Field
The invention relates to the technical field of surface engineering, in particular to a preparation method of a high-temperature-resistant insulating coating of an electromagnetic induction heating coil.
Background
The induction heat treatment has the advantages of high heating speed, low energy consumption, high production efficiency, no pollution and easy realization of automation, and is widely applied to the heat treatment industry, wherein the electromagnetic induction heating coil is an important component on an induction heat treatment production line, directly influences the heat treatment quality of workpieces and influences the qualification rate of finished products. Electromagnetic induction heating coil is made by the copper tubing more, copper conductivity, the plasticity is all comparatively excellent, but intensity, hardness is relatively poor, and induction heat treatment temperature can reach more than 900 ℃, the coil is heated and softens, it is yielding, influence the even degree of work piece heating, simultaneously the heating efficiency of coil and the distance between coil and the work piece become the inverse ratio relation, the distance between induction coil and the work piece generally is 1 ~ 4mm, so little distance, must consider the insulating problem between electromagnetic induction heating coil and the work piece, in order to avoid between coil and the work piece contact to lead to short circuit damage equipment and then arouse the incident.
The Al2O3 ceramic coating has higher dielectric constant, is a good electric insulating material, has high hardness, excellent high temperature resistance, wear resistance and electrochemical performance, can obviously improve the strength and electric insulation of a matrix, and is suitable for a surface film of an electromagnetic heating induction coil. The atmospheric plasma spraying technology is a widely applied surface strengthening technology, powder is fed into plasma flame flow to be heated and melted, the temperature of the plasma flame flow can reach 12000-16000 ℃, the flame flow speed is 200-1200 m/s, the ceramic powder can be fully melted in a short time, the plasma flame flow impacts the sand-blasted surface at a high speed, and the ceramic powder is spread and cooled at an ultrahigh cooling rate, so that a required coating is obtained.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of a high-temperature-resistant insulating coating of an electromagnetic induction heating coil, which solves the problems that the coil is softened by heating and easy to deform, the heating uniformity of a workpiece is influenced, the distance between the induction coil and the workpiece is generally 1-4 mm, and the insulation between the electromagnetic induction heating coil and the workpiece is poor due to the small distance.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a high-temperature-resistant insulating coating of an electromagnetic induction heating coil comprises the following steps:
s1, cleaning and sandblasting: polishing the electromagnetic induction heating coil by using sand paper, cleaning by using absolute ethyl alcohol, and performing sand blasting treatment on the surface of the electromagnetic induction heating coil by using 24-mesh brown corundum sand;
s2, weighing Al2O3 ceramic particles and TiO2 powder according to the component proportion of the coating, and uniformly mixing the ceramic particles and the TiO2 powder, wherein the component proportion is as follows: 97 wt% Al2O3 ceramic particles, 3 wt% TiO2 powder.
S3, before spraying, the mixture for thermal spraying is placed in an environment with the temperature of 90-120 ℃ to be dried for 1-2 hours.
S4, pouring the dried mixed powder into a powder feeder, and adjusting powder feeding airflow to enable the powder to be just fed into the center of the plasma flame flow; the technological parameters of the atmospheric plasma spraying are as follows: the spraying distance is 120mm, the flow of plasma gas flow H2 is 8L/min, the flow of Ar is 50L/min, the current is 517A, the voltage is 58V, the moving speed of the spray gun is 250mm/s, the spray gun moves downwards for 3mm each time, the spraying is repeated for 5 times, and finally, a high-temperature-resistant and wear-resistant insulating coating with the thickness of about 300 mu m is deposited on the surface of the electromagnetic induction heating coil subjected to sand blasting.
Furthermore, the grinding mode in the step S1 adopts 600#, 1000# and 2000# SiC abrasive paper for fine grinding, so as to ensure that the surface of the coil is smooth and flat without obvious unevenness.
Further, the cleaning method in step S1 is to clean the coil for 2min in an absolute ethanol solution using an ultrasonic cleaning machine, take out the coil, cool the cleaning solution for 2min, repeat the cleaning process for 5 times, and prevent the cleaning solution from rising in temperature and decreasing in cleaning effect due to continuous ultrasonic cleaning for a long time.
Further, the sand blasting process parameters in the step S1 are: the sand blasting pressure is 0.5MPa, the sand blasting angle is about 75 degrees, and the roughness of the surface of the electromagnetic induction heating coil after sand blasting treatment is Ra7.0-9.0.
Furthermore, after the sand blasting treatment, sand particles on the surface of the electromagnetic induction heating coil are cleaned through compressed air, and ultrasonic cleaning is carried out in absolute ethyl alcohol, wherein the cleaning mode is the same as the above.
Further, the composition ratio in the step S2 is 97 wt% of Al2O3 ceramic particles and 3 wt% of TiO2 powder.
Further, the mixture in the step S3 is dried in a vacuum drying oven.
Furthermore, the electromagnetic heating induction coil is made of red copper.
The beneficial effects are as follows:
the preparation method of the high-temperature-resistant insulating coating of the electromagnetic induction heating coil is characterized in that the high-temperature-resistant and wear-resistant insulating coating is quickly prepared on the surface of the electromagnetic induction heating coil by an atmospheric plasma thermal spraying technology, and because a proper amount of TiO2 powder is added into Al2O3 ceramic particles, the compactness, the spraying deposition rate and the toughness of the coating are obviously improved, the coating is good in combination effect with a substrate and not easy to fall off, and the high-temperature-resistant and excellent wear resistance of the coating are good.
Detailed Description
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a preparation method of a high-temperature-resistant insulating coating of an electromagnetic induction heating coil comprises the following steps:
(1) cleaning and sand blasting: grinding the electromagnetic induction heating coil by using 600#, 1000# and 2000# sandpaper respectively, cleaning by using absolute ethyl alcohol, and performing sand blasting treatment on the surface of the electromagnetic induction heating coil by using 24-mesh brown corundum sand;
(2) the cleaning method comprises cleaning with an ultrasonic cleaning machine in absolute ethanol solution for 2min, taking out the coil, cooling the cleaning solution for 2min, repeating for 5 times, and preventing continuous long-time ultrasonic cleaning to increase the temperature of the cleaning solution and reduce the cleaning effect;
(3) the sand blasting process parameters are as follows: the sand blasting pressure is 0.5MPa, the sand blasting angle is about 75 degrees, and the roughness of the surface of the electromagnetic induction heating coil after sand blasting treatment is Ra7.0-9.0.
(4) After sand blasting, cleaning sand particles on the surface of the electromagnetic induction heating coil by compressed air, and carrying out ultrasonic cleaning in absolute ethyl alcohol in the same manner;
(5) weighing Al2O3 ceramic particles and TiO2 powder according to the component proportion of the coating, and uniformly mixing the ceramic particles and the TiO2 powder, wherein the component proportion is as follows: 97 wt% Al2O3 ceramic particles, 3 wt% TiO2 powder;
(6) before spraying, the mixture for thermal spraying is placed in a vacuum drying oven at the temperature of 90-120 ℃ for drying for 1-2 hours;
(7) and pouring the dried mixed powder into a powder feeder, and adjusting the powder feeding airflow to ensure that the powder is just fed into the center of the plasma flame flow. The technological parameters of the atmospheric plasma spraying are as follows: the spraying distance was 120mm, the flow rate of plasma gas H2 was 8L/min, the flow rate of Ar was 50L/min, the current was 517A, the voltage was 58V, the moving speed of the spray gun was 250mm/s, 3mm was moved down each time, and the spraying was repeated 5 times. Finally, a high-temperature-resistant wear-resistant insulating coating with the thickness of about 300 mu m is deposited on the surface of the electromagnetic induction heating coil subjected to sand blasting.
Example 1
The preparation method comprises the following steps:
s1, cleaning and sandblasting: polishing the electromagnetic induction heating coil by using sand paper, cleaning by using absolute ethyl alcohol, and performing sand blasting treatment on the surface of the electromagnetic induction heating coil by using 24-mesh brown corundum sand;
s2, weighing Al2O3 ceramic particles and TiO2 powder according to the component proportion of the coating, and uniformly mixing the ceramic particles and the TiO2 powder, wherein the component proportion is as follows: 97 wt% Al2O3 ceramic particles, 3 wt% TiO2 powder;
s3, drying the mixture for thermal spraying in an environment at 90 ℃ for 1h before spraying;
and S4, pouring the dried mixed powder into a powder feeder, and adjusting the powder feeding airflow to ensure that the powder is just fed into the center of the plasma flame flow. The technological parameters of the atmospheric plasma spraying are as follows: the spraying distance is 120mm, the flow of plasma gas flow H2 is 8L/min, the flow of Ar is 50L/min, the current is 517A, the voltage is 58V, the moving speed of the spray gun is 250mm/s, the spray gun moves downwards for 3mm each time, the spraying is repeated for 5 times, and finally, a high-temperature-resistant and wear-resistant insulating coating with the thickness of about 300 mu m is deposited on the surface of the electromagnetic induction heating coil subjected to sand blasting.
Example 2
S1, cleaning and sandblasting: polishing the electromagnetic induction heating coil by using sand paper, cleaning by using absolute ethyl alcohol, and performing sand blasting treatment on the surface of the electromagnetic induction heating coil by using 24-mesh brown corundum sand;
s2, weighing Al2O3 ceramic particles and TiO2 powder according to the component proportion of the coating, and uniformly mixing the ceramic particles and the TiO2 powder, wherein the component proportion is as follows: 97 wt% Al2O3 ceramic particles, 3 wt% TiO2 powder;
s3, drying the mixture for thermal spraying in an environment at 105 ℃ for 1.5h before spraying;
and S4, pouring the dried mixed powder into a powder feeder, and adjusting the powder feeding airflow to ensure that the powder is just fed into the center of the plasma flame flow. The technological parameters of the atmospheric plasma spraying are as follows: the spraying distance is 120mm, the flow of plasma gas flow H2 is 8L/min, the flow of Ar is 50L/min, the current is 517A, the voltage is 58V, the moving speed of the spray gun is 250mm/s, the spray gun moves downwards for 3mm each time, the spraying is repeated for 5 times, and finally, a high-temperature-resistant and wear-resistant insulating coating with the thickness of about 300 mu m is deposited on the surface of the electromagnetic induction heating coil subjected to sand blasting.
Example 3
S1, cleaning and sandblasting: polishing the electromagnetic induction heating coil by using sand paper, cleaning by using absolute ethyl alcohol, and performing sand blasting treatment on the surface of the electromagnetic induction heating coil by using 24-mesh brown corundum sand;
s2, weighing Al2O3 ceramic particles and TiO2 powder according to the component proportion of the coating, and uniformly mixing the ceramic particles and the TiO2 powder, wherein the component proportion is as follows: 97 wt% Al2O3 ceramic particles, 3 wt% TiO2 powder;
s3, drying the mixture for thermal spraying in an environment at 120 ℃ for 2h before spraying;
and S4, pouring the dried mixed powder into a powder feeder, and adjusting the powder feeding airflow to ensure that the powder is just fed into the center of the plasma flame flow. The technological parameters of the atmospheric plasma spraying are as follows: the spraying distance is 120mm, the flow of plasma gas flow H2 is 8L/min, the flow of Ar is 50L/min, the current is 517A, the voltage is 58V, the moving speed of the spray gun is 250mm/s, the spray gun moves downwards for 3mm each time, the spraying is repeated for 5 times, and finally, a high-temperature-resistant and wear-resistant insulating coating with the thickness of about 300 mu m is deposited on the surface of the electromagnetic induction heating coil subjected to sand blasting.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A preparation method of a high-temperature-resistant insulating coating of an electromagnetic induction heating coil is characterized by comprising the following steps: the preparation method comprises the following steps:
s1, cleaning and sandblasting: polishing the electromagnetic induction heating coil by using sand paper, cleaning by using absolute ethyl alcohol, and performing sand blasting treatment on the surface of the electromagnetic induction heating coil by using 24-mesh brown corundum sand;
s2, weighing Al2O3 ceramic particles and TiO2 powder according to the component proportion of the coating, and uniformly mixing the ceramic particles and the TiO2 powder, wherein the component proportion is as follows: 97 wt% Al2O3 ceramic particles, 3 wt% TiO2 powder;
s3, before spraying, drying the mixture for thermal spraying in an environment at 90-120 ℃ for 1-2 h;
s4, pouring the dried mixed powder into a powder feeder, and adjusting powder feeding airflow to enable the powder to be just fed into the center of the plasma flame flow; the technological parameters of the atmospheric plasma spraying are as follows: the spraying distance is 120mm, the flow of plasma gas flow H2 is 8L/min, the flow of Ar is 50L/min, the current is 517A, the voltage is 58V, the moving speed of the spray gun is 250mm/s, the spray gun moves downwards for 3mm each time, the spraying is repeated for 5 times, and finally, a high-temperature-resistant and wear-resistant insulating coating with the thickness of about 300 mu m is deposited on the surface of the electromagnetic induction heating coil subjected to sand blasting.
2. The method for preparing the high-temperature-resistant insulating coating of the electromagnetic induction heating coil according to claim 1, characterized in that: and the grinding mode in the step S1 adopts 600#, 1000# and 2000# SiC sand paper for fine grinding, so that the surface of the coil is smooth and flat without obvious concave-convex.
3. The method for preparing the high-temperature-resistant insulating coating of the electromagnetic induction heating coil according to claim 1, characterized in that: the cleaning method in step S1 is to use an ultrasonic cleaning machine to clean for 2min in an absolute ethanol solution, take out the coil and cool the cleaning solution for 2min, repeat for 5 times, and prevent continuous long-time ultrasonic cleaning, so that the temperature of the cleaning solution rises and the cleaning effect decreases.
4. The method for preparing the high-temperature-resistant insulating coating of the electromagnetic induction heating coil according to claim 1, characterized in that: the sand blasting process parameters in the step S1 are as follows: the sand blasting pressure is 0.5MPa, the sand blasting angle is about 75 degrees, and the roughness of the surface of the electromagnetic induction heating coil after sand blasting treatment is Ra7.0-9.0.
5. The method for preparing the high-temperature-resistant insulating coating of the electromagnetic induction heating coil according to claim 1, characterized in that: and after the sand blasting treatment, cleaning sand grains on the surface of the electromagnetic induction heating coil by compressed air, and carrying out ultrasonic cleaning in absolute ethyl alcohol in the same manner.
6. The method for preparing the high-temperature-resistant insulating coating of the electromagnetic induction heating coil according to claim 1, characterized in that: the composition ratio in the step S2 is 97 wt% of Al2O3 ceramic particles and 3 wt% of TiO2 powder.
7. The method for preparing the high-temperature-resistant insulating coating of the electromagnetic induction heating coil according to claim 1, characterized in that: and drying the mixture in the step S3 in a vacuum drying oven.
8. The method for preparing the high-temperature-resistant insulating coating of the electromagnetic induction heating coil according to claim 1, characterized in that: the electromagnetic heating induction coil is made of red copper.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113512707A (en) * | 2021-06-09 | 2021-10-19 | 江苏南钢通恒特材科技有限公司 | Preparation method of electromagnetic induction heating coil aluminum oxide film |
| CN114774829A (en) * | 2022-05-07 | 2022-07-22 | 无锡市新达共创纳米科技有限公司 | Insulating ceramic coating of roll for electrolytic copper foil surface treatment machine and method for manufacturing the same |
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Cited By (2)
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| CN114774829A (en) * | 2022-05-07 | 2022-07-22 | 无锡市新达共创纳米科技有限公司 | Insulating ceramic coating of roll for electrolytic copper foil surface treatment machine and method for manufacturing the same |
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Application publication date: 20201225 |