CN113956074A - Preparation method for improving voltage resistance of PTC (positive temperature coefficient) ceramic - Google Patents
Preparation method for improving voltage resistance of PTC (positive temperature coefficient) ceramic Download PDFInfo
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- CN113956074A CN113956074A CN202111261863.0A CN202111261863A CN113956074A CN 113956074 A CN113956074 A CN 113956074A CN 202111261863 A CN202111261863 A CN 202111261863A CN 113956074 A CN113956074 A CN 113956074A
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- ptc
- ceramic
- voltage resistance
- aqueous solution
- coating
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- 239000000919 ceramic Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 17
- 230000001681 protective effect Effects 0.000 claims abstract description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 10
- 239000010703 silicon Substances 0.000 claims abstract description 10
- 238000003618 dip coating Methods 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 238000007650 screen-printing Methods 0.000 claims abstract description 7
- 239000007864 aqueous solution Substances 0.000 claims description 21
- 239000005543 nano-size silicon particle Substances 0.000 claims description 8
- 229920001296 polysiloxane Polymers 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000032683 aging Effects 0.000 abstract 1
- 230000003373 anti-fouling effect Effects 0.000 abstract 1
- 230000002209 hydrophobic effect Effects 0.000 abstract 1
- 239000002210 silicon-based material Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 12
- 230000006872 improvement Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000000741 silica gel Substances 0.000 description 4
- 229910002027 silica gel Inorganic materials 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012776 electronic material Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5093—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with elements other than metals or carbon
- C04B41/5096—Silicon
Abstract
The invention discloses a preparation method for improving the voltage resistance of PTC (positive temperature coefficient) ceramic through surface coating, which comprises the following steps: 1) coating a layer of organic silicon protective film on the peripheral side of the PTC thermosensitive ceramic element by a dip coating or screen printing method; 2) and carrying out heat treatment on the coated PTC element for 20-120 min at the temperature of 200-300 ℃. The invention utilizes the hydrophobic and antifouling properties of the organic silicon materials to seal the micropores on the side edge of the PTC ceramic, and isolate the influence of environmental atmosphere such as moisture, reducing gas and the like, so that the voltage resistance of the PTC ceramic in the heater is improved, and the power aging of the PTC ceramic is reduced.
Description
Technical Field
The invention relates to the technical field of ceramic material preparation, in particular to a preparation method for improving the voltage resistance of PTC (positive temperature coefficient) ceramic by improving surface coating, which is applied to the technical field of electronic materials.
Background
PTCR ceramics generally refer to thermistor materials or components having a Positive Temperature Coefficient of resistance (Positive Temperature Coefficient). The PTCR ceramic has the advantages of temperature sensitivity, energy conservation, no open fire, safety and the like, and is widely applied to the fields of household appliances, communication, automobiles, automatic control and the like. The heater manufactured by using the PTC as the constant temperature heating element has high reliability and high safety, and the heating value can be automatically adjusted along with the change of the environmental temperature.
PTC ceramics are used as core heating components in a heat management system of the new energy electric automobile, and the trend of improving the working voltage is towards shortening the charging time, so that higher requirements are put forward on the voltage resistance of the PTC. The PTC heating element is generally bonded with the electrode plate by using silica gel to enable the PTC heating element to conduct electricity, the silica gel component contains organic volatile substances, and when the silica gel is cured at 180-285 ℃ and works for a long time when being electrified, the organic silica gel can volatilize dimethyl cyclosiloxane (DMC) in the temperature range to enable the PTC ceramic plate to work in a weak reducing atmosphere, so that the electrical property of the PTC is deteriorated, and the room temperature resistivity of the PTC heating element can be reduced to different degrees. In addition, factors such as moisture and oil stains which have a deteriorating influence on the PTC performance inevitably exist in the use environment of the automobile. These reducing atmospheres, moisture, etc. can form conductive paths on the sides of the PTC ceramic, causing electrical breakdown of the PTC during use and causing safety hazards. Increasing the thickness of PTC ceramics to combat these adverse effects is currently common practice, but increasing volume and weight is unacceptable in automobiles.
Therefore, it is desirable to provide a preparation method for improving the voltage resistance of the PTC ceramic.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a manufacturing method for improving the voltage resistance of PTC ceramics by improving surface coating.
In order to solve or partially solve the technical problems, the application provides a preparation method for improving the voltage resistance of PTC ceramics, which comprises the following process steps:
1) coating a layer of organic silicon aqueous solution on the peripheral side of the PTC thermosensitive ceramic element by a dip coating or screen printing method;
2) and (3) performing heat treatment on the coated PTC heat-sensitive ceramic element to form a protective film on the outer periphery of the PTC heat-sensitive ceramic element.
As a further improvement of the embodiment of the present invention, the silicone aqueous solution in step 1) comprises, in terms of weight percentage of raw materials:
as a further improvement of the embodiment of the invention, the particle size in the nano silicon aqueous solution is less than or equal to 50 nm.
In a further improvement of the embodiment of the present invention, the PH of the silicone aqueous solution is 6.0 to 6.8.
As a further improvement of the embodiment of the invention, the heat treatment temperature in the step 2) is 200-300 ℃, and the heat treatment time at the temperature is more than 10 minutes.
As a further improvement of the embodiment of the present invention, the thickness of the protective film formed on the outer peripheral side of the PTC thermosensitive ceramic element in step 2) is not more than 40 μm.
Compared with the prior art, the invention has the advantages that:
a layer of uniform and compact protective film is formed on the periphery of the PTC ceramic by a method of physical coating, nano-silicon mixing and heat treatment, and the corrosion of atmosphere, moisture and the like in a use environment to the PTC body is blocked by utilizing the characteristics of hydrophobicity, lipophobicity and the like of the protective film, so that the voltage resistance of the PTC ceramic is improved. The method is simple to operate, easy to control, low in cost and easy to implement industrially.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. 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 application.
The embodiment of the application provides a preparation method for improving the voltage resistance of PTC (positive temperature coefficient) ceramic, which comprises the following process steps:
1) coating a layer of organic silicon aqueous solution on the peripheral side of the PTC thermosensitive ceramic element by a dip coating or screen printing method;
2) the coated PTC heat-sensitive ceramic element is subjected to heat treatment to form a protective film on the outer peripheral side of the PTC heat-sensitive ceramic element.
Wherein the organosilicon aqueous solution in the step 1) comprises the following raw materials in percentage by weight:
preferably, the particle size in the nano-silicon aqueous solution is less than or equal to 50 nm.
In the embodiment of the invention, the pH value of the organic silicon aqueous solution is 6.0-6.8.
Preferably, the heat treatment temperature in the step 2) is 200-300 ℃, and the heat treatment time at the temperature is more than 10 minutes.
Further, the thickness of the protective film formed on the periphery of the PTC heat-sensitive ceramic element in the step 2) is less than or equal to 40 microns.
Example 1
The invention discloses a preparation method for improving the voltage resistance of PTC (positive temperature coefficient) ceramic through surface coating, which comprises the following process steps:
1) coating a layer of organic silicon aqueous solution on the peripheral side of the PTC thermosensitive ceramic element by a dip-coating method; in this embodiment, the dip coating is performed by placing a sponge with a thickness of 2mm in a flat-bottom stainless steel basin, and pouring the prepared silicone solution into the basin, wherein the solution just submerges the sponge; then the side edge of the PTC ceramic chip which is arranged orderly is integrally placed on the sponge for 1 second, and the periphery is dipped and coated in turn according to the method); the PTC ceramic plates can also be arranged in order by adopting screen printing, preferably, a 260-mesh screen, and then 4 sides on the outer periphery side are sequentially printed;
2) and (3) carrying out heat treatment on the coated PTC element at the temperature of 250 ℃ in the atmospheric atmosphere for 30min to form a uniform and compact protective film on the side edge of the ceramic, wherein the film thickness is about 11 mu m.
In this embodiment, the silicone solution includes, in weight percent, the following raw materials:
the particle size of the nano-silicon aqueous solution in the proportion is 35-45 nm, and the pH value of the aqueous solution is 6.7.
The finished product of the concrete example 1 prepared in the above way is tested, after surface coating, the room temperature resistance change rate of the finished product is less than 5%, the voltage resistance strength of the ceramic piece is 350VAC/mm, a heater is assembled, and the voltage resistance value under the windless condition is more than 800 VAC; 220VAC dry-burning 1000H without air, the power is reduced by less than 8%.
Example 2
The invention discloses a preparation method for improving the voltage resistance of PTC (positive temperature coefficient) ceramic through surface coating, which comprises the following process steps:
1) dip-coating the periphery of the PTC thermosensitive ceramic element, wherein the dip-coating operation is to coat a layer of organic silicon aqueous solution by adopting a method of printing a 260-mesh silk screen, arranging PTC ceramic pieces in order and sequentially printing 4 sides by silk screen printing; or placing sponge with the thickness of 2mm in a flat-bottom stainless steel basin, pouring the prepared organic silicon solution, wherein the solution just exceeds the thickness of the sponge, then placing the whole side edge of the orderly arranged PTC ceramic wafer on the sponge for 1 second, and dip-coating the periphery of the PTC ceramic wafer according to the method;
2) and (3) carrying out heat treatment on the coated PTC element at the temperature of 270 ℃ in the atmospheric atmosphere for 30min to form a uniform and compact protective film on the side edge of the ceramic, wherein the film thickness is about 15 mu m.
The silicone solution described in this embodiment includes, in weight percent, the following raw materials:
the particle size of the nano-silicon aqueous solution in the proportion is 35-45 nm, and the pH value of the aqueous solution is 6.2.
Testing the finished product of the concrete example 2 prepared above, after surface coating, the room temperature resistance change rate of the finished product is less than 5%, the voltage resistance strength of the ceramic piece is 350VAC/mm, the ceramic piece is assembled into a heater, and the voltage resistance value under the windless condition is more than 850 VAC; 220VAC dry-fire 1000H without wind, the power is reduced by less than 8%
Example 3
The invention discloses a preparation method for improving the voltage resistance of PTC (positive temperature coefficient) ceramic through surface coating, which comprises the following process steps:
1) the PTC thermal sensitive ceramic element is dipped on the periphery side (sponge with the thickness of 2mm is placed in a flat-bottom stainless steel basin, and the prepared organic silicon solution is poured into the basin, and the solution just exceeds the thickness of the sponge. Then the side edge of the PTC ceramic chip which is arranged orderly is integrally placed on the sponge for 1 second, and the periphery is dipped and coated in turn according to the method); or coating a layer of organic silicon aqueous solution by a screen printing method (in the embodiment, a 260-mesh screen is adopted, the PTC ceramic sheets are arranged in order, and 4 sides are printed in sequence);
2) and (3) carrying out heat treatment on the coated PTC element at the temperature of 270 ℃ in the atmospheric atmosphere for 30min to form a uniform and compact protective film on the side edge of the ceramic, wherein the film thickness is about 16 mu m.
The silicone solution described in this embodiment includes, in weight percent, the following raw materials:
in the specific embodiment of the invention, the particle size of the nano-silicon aqueous solution in the above proportion is 35-45 nm, and the pH value of the aqueous solution is 6.1.
Testing the finished product of the concrete example 3 prepared above, after surface coating, the room temperature resistance change rate of the finished product is less than 5%, the voltage resistance strength of the ceramic piece is 350VAC/mm, the ceramic piece is assembled into a heater, and the voltage resistance value under the windless condition is more than 850 VAC; 220VAC dry-burning 1000H without air, the power is reduced by less than 7%.
Compared with the prior art, the invention has the advantages that:
a layer of uniform and compact protective film is formed on the periphery of the PTC ceramic by a method of physical coating, nano-silicon mixing and heat treatment, and the corrosion of atmosphere, moisture and the like in a use environment to the PTC body is blocked by utilizing the characteristics of hydrophobicity, lipophobicity and the like of the protective film, so that the voltage resistance of the PTC ceramic is improved. The method is simple to operate, easy to control, low in cost and easy to implement industrially.
It is to be understood that the terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only, and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a" and "an" typically include at least two, but do not exclude the presence of at least one.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
Finally, it should be noted that those skilled in the art will appreciate that embodiments of the present application present many technical details for the purpose of enabling the reader to better understand the present application. However, the technical solutions claimed in the claims of the present application can be basically implemented without these technical details and various changes and modifications based on the above-described embodiments. Accordingly, in actual practice, various changes in form and detail may be made to the above-described embodiments without departing from the spirit and scope of the present application.
Claims (6)
1. A preparation method for improving the voltage resistance of PTC ceramics is characterized by comprising the following process steps:
1) coating a layer of organic silicon aqueous solution on the peripheral side of the PTC thermosensitive ceramic element by a dip coating or screen printing method;
2) and (3) performing heat treatment on the coated PTC heat-sensitive ceramic element to form a protective film on the outer periphery of the PTC heat-sensitive ceramic element.
2. The method for preparing PTC ceramic with improved voltage resistance according to claim 1, wherein the silicone aqueous solution of step 1) comprises the following raw materials by weight percent:
3. the method as claimed in claim 2, wherein the size of the particles in the nano-silicon aqueous solution is less than or equal to 50 nm.
4. The method according to claim 2, wherein the aqueous solution of silicone has a pH of 6.0 to 6.8.
5. The method according to claim 1, wherein the heat treatment temperature in step 2) is 200-300 ℃, and the heat treatment time at the temperature is greater than 10 minutes.
6. The method according to claim 1, wherein the protective film formed on the outer circumferential side of the PTC thermal ceramic element in step 2) has a thickness of 40 μm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111261863.0A CN113956074A (en) | 2021-10-28 | 2021-10-28 | Preparation method for improving voltage resistance of PTC (positive temperature coefficient) ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111261863.0A CN113956074A (en) | 2021-10-28 | 2021-10-28 | Preparation method for improving voltage resistance of PTC (positive temperature coefficient) ceramic |
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| CN113956074A true CN113956074A (en) | 2022-01-21 |
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| CN202111261863.0A Pending CN113956074A (en) | 2021-10-28 | 2021-10-28 | Preparation method for improving voltage resistance of PTC (positive temperature coefficient) ceramic |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160152840A1 (en) * | 2010-09-02 | 2016-06-02 | United Technologies Corporation | Hydrophobic coating for coated article |
| CN106221354A (en) * | 2016-08-19 | 2016-12-14 | 袁中良 | A kind of multi-functional coalescents and preparation method and application |
| CN107739217A (en) * | 2017-09-30 | 2018-02-27 | 佛山欧神诺陶瓷股份有限公司 | A kind of preparation method of the polishing class Ceramic Tiles with wet antiskid function |
| CN109306243A (en) * | 2018-08-23 | 2019-02-05 | 国网湖南省电力有限公司 | A kind of super hydrophobic coating and its preparation method and application of resistance to greasy dirt |
| CN112210293A (en) * | 2020-10-16 | 2021-01-12 | 佛山市思特四通科技有限公司 | Hydrophobic and oleophobic coating composition and preparation method thereof |
-
2021
- 2021-10-28 CN CN202111261863.0A patent/CN113956074A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160152840A1 (en) * | 2010-09-02 | 2016-06-02 | United Technologies Corporation | Hydrophobic coating for coated article |
| CN106221354A (en) * | 2016-08-19 | 2016-12-14 | 袁中良 | A kind of multi-functional coalescents and preparation method and application |
| CN107739217A (en) * | 2017-09-30 | 2018-02-27 | 佛山欧神诺陶瓷股份有限公司 | A kind of preparation method of the polishing class Ceramic Tiles with wet antiskid function |
| CN109306243A (en) * | 2018-08-23 | 2019-02-05 | 国网湖南省电力有限公司 | A kind of super hydrophobic coating and its preparation method and application of resistance to greasy dirt |
| CN112210293A (en) * | 2020-10-16 | 2021-01-12 | 佛山市思特四通科技有限公司 | Hydrophobic and oleophobic coating composition and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 《电子工艺技术》: "《表面贴装高精度大功率NTC热敏电阻的研发》", 《电子工艺技术》 * |
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Application publication date: 20220121 |