CN108715989B - Preparation method of plasma spraying insulating coating - Google Patents
Preparation method of plasma spraying insulating coating Download PDFInfo
- Publication number
- CN108715989B CN108715989B CN201810529385.9A CN201810529385A CN108715989B CN 108715989 B CN108715989 B CN 108715989B CN 201810529385 A CN201810529385 A CN 201810529385A CN 108715989 B CN108715989 B CN 108715989B
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- Prior art keywords
- insulating coating
- coating
- plasma
- gas flow
- insulating
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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
- C23C4/12—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
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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
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
Abstract
The invention relates to a preparation method of a plasma spraying insulating coating, wherein a transition layer sprayed by the coating is a nickel-based alloy material, the insulating coating sprayed by the plasma adopts high-purity alumina powder, and plasma spraying equipment which adopts argon as main gas and hydrogen as auxiliary gas comprises the following steps: the basal body is checked and cleaned as required; carrying out preheating treatment on the matrix; the temperature and speed of plasma flame flow are changed by adjusting the gas flow of argon and hydrogen, the powder is sent to the center of the flame flow by adjusting the gas flow of carrier gas, the carrier gas flow is 1-10NLPM, the powder sending amount is 10-200g/min, and the spraying distance is 50-200 mm. The insulating material can be used for insulating and protecting the surfaces of electrical elements in the automobile industry. The insulating coating material with high melting point is prepared by plasma spraying. The coating has the characteristics of good insulating property, simple preparation process and excellent electric-thermal insulating property.
Description
Technical Field
The invention belongs to the field of surface treatment, and relates to a preparation method of a plasma spraying insulating coating.
Background
Plasma spraying belongs to one of hot spraying surface technologies, and plasma generated by cathode and anode arc discharge is used as a heat source, and a coating is formed by accelerating a spraying material by means of high-speed plasma jet and then impacting a substrate. The plasma flame flow has high temperature and concentrated energy and is very suitable for preparing various high-melting-point ceramic coatings. The fused particles are fully deformed when colliding with parts, the coating is compact, the surface is flat and smooth, and the bonding strength with the matrix is high. The plasma spraying technology is an economical and effective method for strengthening and pre-protecting the surface of a part, can endow the surface with multiple functions of wear resistance, corrosion resistance, high-temperature oxidation resistance and the like, and is widely applied to various industrial fields of aerospace, petroleum and natural gas, steel and the like.
In industrial applications, electrical erosion problems are often encountered, from simple exhaust ventilation equipment to complex, extremely powerful high-speed rail vehicles. Galvanic corrosion is a form of electrical damage caused by the flow of electrical current through components such as bearings. When current flows through the part, a large number of pits with the diameter of only a few micrometers are formed on the inner surface and the outer surface of the part due to the discharge effect, the part can be failed quickly due to abrasion, the maintenance cost is increased, and even huge economic loss is caused. With the wide application of frequency converters, the problem of electric erosion of parts is becoming more serious. In addition, the resistance heater of the current new energy automobile is usually heated by adopting a PTC material, a heating area of the resistance heater needs to be electrically insulated from the external environment to a very high level, and if a certain amount of leakage current occurs, the resistance heater may be over-temperature, electrically conducted and the like, so that the resistance heater is broken down, and the automobile is caused to self-ignite in a serious case.
In order to overcome the technical barriers existing in the current application, the technology which can maintain the attribute characteristics of the material matrix and provide electric insulation protection is developed, and the method has very important practical significance.
Disclosure of Invention
The invention aims to provide a preparation method of a plasma spraying insulating coating for improving the surface insulating property of an electric appliance element. The coating has the characteristics of good insulating property, simple preparation process and excellent electric-thermal insulating property.
The technical scheme of the invention is realized as follows: the plasma spraying insulating coating is prepared with high purity alumina powder in 99% or more and has grain size distribution of 5-90 microns. The insulating coating material with high melting point is prepared by plasma spraying. The transition layer is made of nickel-based alloy material. The two materials have good thermal expansion coefficient matching performance, and the coating has good bonding strength.
The invention can provide a method for preparing an insulating coating by plasma spraying, which comprises the following steps:
firstly, checking and cleaning a substrate as required;
secondly, preheating the substrate;
and thirdly, adopting argon as main gas and hydrogen as auxiliary gas. The temperature and speed of the plasma flame flow were varied by adjusting the gas flow rates of argon and hydrogen. For example, the gas flow rate of argon is 20-70NLPM, and the gas flow rate of hydrogen is 1-10 NLPM. The temperature of the plasma flame flow can be regulated and controlled through the current, and the current is 300-600A. The powder is sent to the center of flame flow by adjusting the gas flow of carrier gas, the carrier gas flow is 1-10NLPM, and the powder sending amount is 10-200 g/min. The spraying distance is 50-200 mm. Spraying for 2-30 times, wherein the thickness of the insulating coating is 20-600 μm;
and fourthly, testing the electrical insulation performance of the insulation coating, wherein the insulation resistance is greater than 8G omega, and the voltage breakdown resistance is greater than 5000V.
The invention mainly solves the problem of insulating property of the surface of an electric appliance element of an electric vehicle. The prepared coating has good compactness, less unmelted particles and excellent electrical insulation performance. The preparation method has the advantages of reasonable and scientific preparation method, simple operation, easy implementation and convenient large-scale production.
Detailed Description
The plasma spraying insulating coating is prepared with high purity alumina powder in 99% or more and has grain size distribution of 5-90 microns. The insulating coating material with high melting point is prepared by plasma spraying. The substrate is made of nickel-based alloy material. The present invention may provide a method of preparing an insulating coating by plasma spraying, the method comprising the following steps.
1. The substrate is inspected and cleaned as required.
2. And carrying out preheating treatment on the matrix by adopting plasma flame flow.
3. Argon is used as main gas and hydrogen is used as auxiliary gas. The temperature and speed of the plasma flame flow were varied by adjusting the gas flow rates of argon and hydrogen. For example, the gas flow rate of argon is 20-70NLPM, and the gas flow rate of hydrogen is 1-10 NLPM. The temperature of the plasma flame flow can be regulated and controlled through the current, and the current is 300-600A. The powder is sent to the center of flame flow by adjusting the gas flow of carrier gas, the carrier gas flow is 1-10NLPM, and the powder sending amount is 10-200 g/min. The spraying distance is 50-200 mm. Spraying for 2-30 times.
4. After the spraying was completed, the thickness of the insulating coating was measured to be 20-600 μm.
And (3) testing the electrical insulation performance of the insulation coating, wherein the insulation resistance is greater than 8G omega, and the voltage breakdown resistance is greater than 5000V. Metallographic analysis is carried out on the sprayed insulating coating, and the porosity of the coating is 0.5-12%. And carrying out microhardness test on the sprayed insulating coating, wherein the hardness value is 300-.
Claims (5)
1. A preparation method of a plasma spraying insulating coating for electrical components is characterized in that a transition layer sprayed by the coating is a nickel-based alloy material, the plasma spraying insulating coating is made of high-purity alumina powder, the coating contains more than 99% of high-purity alumina powder, the particle size distribution range of the alumina powder is 5-90 mu m, and plasma spraying equipment with argon as a main gas and hydrogen as an auxiliary gas is adopted, and the method comprises the following steps:
the method comprises the following steps: the basal body is checked and cleaned as required;
step two: carrying out preheating treatment on the matrix;
step three: the temperature and the speed of plasma flame flow are changed by adjusting the gas flow of argon and hydrogen, the gas flow of argon is 20-70NLPM, and the gas flow of hydrogen is 1-10 NLPM; the temperature of the plasma flame flow is regulated and controlled by current, and the current is 300-600A; the high-purity aluminum oxide powder is delivered to the center of flame flow by adjusting the gas flow of carrier gas, the carrier gas flow is 1-10NLPM, the powder delivery amount is 10-200g/min, and the spraying distance is 50-200 mm;
and (3) carrying out an electrical insulation performance test on the sprayed insulation coating, wherein the insulation resistance is greater than 8G omega, and the voltage breakdown resistance is greater than 5000V.
2. The method for preparing an insulating coating according to claim 1, characterized in that: the substrate is made of a nickel-based alloy material; and in the second step, plasma flame flow is adopted to carry out preheating treatment on the matrix.
3. The method for preparing an insulating coating according to claim 2, characterized in that: spraying for 2-30 times, wherein the thickness of the insulating coating is 20-600 μm.
4. The method for preparing an insulating coating according to claim 2, characterized in that: metallographic analysis is carried out on the sprayed insulating coating, and the porosity of the coating is 0.5-12%.
5. The method for preparing an insulating coating according to claim 2, characterized in that: and carrying out microhardness test on the sprayed insulating coating, wherein the hardness value is 300-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810529385.9A CN108715989B (en) | 2018-05-29 | 2018-05-29 | Preparation method of plasma spraying insulating coating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810529385.9A CN108715989B (en) | 2018-05-29 | 2018-05-29 | Preparation method of plasma spraying insulating coating |
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| CN108715989A CN108715989A (en) | 2018-10-30 |
| CN108715989B true CN108715989B (en) | 2020-11-13 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112553558A (en) * | 2020-11-20 | 2021-03-26 | 中机凯博表面技术江苏有限公司 | Preparation method of bearing surface insulating coating |
| CN112458453B (en) * | 2020-11-24 | 2023-09-15 | 安徽盈锐优材科技有限公司 | Ceramic insulating coating with high bonding strength and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102691026A (en) * | 2011-03-21 | 2012-09-26 | 上海交运股份有限公司 | Resistance welding projection welding core rod and technology for spraying wearing layer on projection welding core rod |
| CN103540887A (en) * | 2013-10-14 | 2014-01-29 | 嘉兴职业技术学院 | Shaft-type part alumina powder plasma-spraying reparation method |
| CN104789914A (en) * | 2015-03-05 | 2015-07-22 | 中国船舶重工集团公司第七二五研究所 | Preparation method for bearing inner-outer ring electrical insulation coating |
| CN106947934A (en) * | 2017-05-09 | 2017-07-14 | 中国科学院兰州化学物理研究所 | A kind of plasma spraying prepares α Al2O3The method of coating |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0827559A (en) * | 1994-07-14 | 1996-01-30 | Ishikawajima Harima Heavy Ind Co Ltd | Thermal insulation coating method |
| EP1365044A1 (en) * | 2002-05-24 | 2003-11-26 | Siemens Aktiengesellschaft | MCrAl-coating |
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- 2018-05-29 CN CN201810529385.9A patent/CN108715989B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102691026A (en) * | 2011-03-21 | 2012-09-26 | 上海交运股份有限公司 | Resistance welding projection welding core rod and technology for spraying wearing layer on projection welding core rod |
| CN103540887A (en) * | 2013-10-14 | 2014-01-29 | 嘉兴职业技术学院 | Shaft-type part alumina powder plasma-spraying reparation method |
| CN104789914A (en) * | 2015-03-05 | 2015-07-22 | 中国船舶重工集团公司第七二五研究所 | Preparation method for bearing inner-outer ring electrical insulation coating |
| CN106947934A (en) * | 2017-05-09 | 2017-07-14 | 中国科学院兰州化学物理研究所 | A kind of plasma spraying prepares α Al2O3The method of coating |
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| CN108715989A (en) | 2018-10-30 |
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