CN107880598B - High-adhesion carbon-resistant coating for platinum-rhodium thermocouple surface and preparation method thereof - Google Patents

High-adhesion carbon-resistant coating for platinum-rhodium thermocouple surface and preparation method thereof Download PDF

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CN107880598B
CN107880598B CN201711163409.5A CN201711163409A CN107880598B CN 107880598 B CN107880598 B CN 107880598B CN 201711163409 A CN201711163409 A CN 201711163409A CN 107880598 B CN107880598 B CN 107880598B
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platinum
coating
coating material
rhodium thermocouple
carbon
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CN107880598A (en
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陈实
牛贺莹
邱新潮
张博文
徐健博
杨晓非
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Huazhong University of Science and Technology
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    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates

Abstract

The invention discloses a platinum-rhodium heat with high adhesive forceA carbon-proof coating on the surface of a galvanic couple and a preparation method thereof belong to the technical field of inorganic functional coating materials2O3Adding 20-30% of Y in the sol-gel2O3The mixture obtained by the superfine powder and the second coating material are obtained by adding Y with the mass fraction of 25-35 percent into the high-temperature adhesive2O3Mixture of ultrafine powders, Y2O3The diameter of the superfine powder is 40nm-60nm, and the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 30 μm-50 μm. The invention utilizes a high temperature binder plus Y2O3When the ultrafine powder is used as a coating material, the material can be bonded together due to the viscosity of the ultrafine powder, so that the prepared carbon-proof coating on the surface of the platinum-rhodium thermocouple has better adhesive force and is less prone to cracking in the oxidation test process.

Description

High-adhesion carbon-resistant coating for platinum-rhodium thermocouple surface and preparation method thereof
Technical Field
The invention belongs to the technical field of inorganic functional coating materials, and particularly relates to a high-adhesion carbon-resistant coating for a platinum-rhodium thermocouple surface and a preparation method thereof.
Background
The temperature sensor is widely applied to modern measurement technology, and a platinum-rhodium (Pt-Rh) thermocouple is a traditional high-temperature measuring sensor element, namely a high-temperature precious metal sensor. As a temperature measuring sensor, the temperature measuring sensor is usually matched with a temperature transmitter, a regulator, a display instrument and the like for use to form a process control system for directly measuring or controlling the temperature of fluid, steam, gas medium and solid surface within the range of 0-1800 ℃ in various production processes, and the long-term use temperature is 1600 ℃. The platinum rhodium (Pt-Rh) thermocouple has the advantages of highest accuracy, best stability, wide temperature measuring temperature range, long service life, high upper temperature measuring limit and the like in a thermocouple series.
Platinum rhodium (Pt-Rh) thermocouples are suitable for use in oxidizing and inert atmospheres, and also for short periods in vacuum, but are not suitable for use in reducing atmospheres or in metal vapor, metal oxide and silica and sulfur oxide atmospheres. In order to solve the problem that a platinum-rhodium (Pt-Rh) thermocouple rapidly fails in a brittle manner at a high temperature of 1600 ℃ or in a reducing environment with C, the following methods are generally adopted to protect the thermocouple at present:
1. the thermocouples were "sheathed" with some high temperature resistant ceramic tubes. This also obviously adversely affects the thermocouple temperature response speed due to the large thickness of the ceramic.
2. And (3) preparing a thicker (more than 100 mu m) thick film coating on the surface of the thermocouple by using electrophoretic deposition, plasma spraying and other methods. The thick film can effectively slow down the oxidation rate of the thermocouple, and cannot seriously affect the temperature response rate. However, thick films prepared by these methods are generally not well adhered and easily fall off.
3. The sol-gel is used for preparing a layer of film (the thickness is less than 1 mu m) on the surface of the thermocouple. The film material can have good adhesion and does not have adverse effect on the temperature response rate. However, since the coating is too thin, it is difficult to ensure that the thermocouple is used for a long time in a reducing environment with C.
4. Preparing a layer of Y on the surface of a platinum-rhodium (Pt-Rh) thermocouple by sol-gel2O3A film. However, due to Y in the coating2O3The adhesion between the coating and a substrate is not enough, and a method of sintering at a high temperature of 500 ℃ after coating is finished is generally adopted, but the method causes higher coating cost.
Therefore, the technical problems of short service life of the platinum-rhodium thermocouple temperature measurement, low thermocouple temperature response speed, high cost and low adhesive force exist in the prior art.
Disclosure of Invention
Aiming at the defects or improvement requirements in the prior art, the invention provides a high-adhesion carbon-proof coating on the surface of a platinum-rhodium thermocouple and a preparation method thereof, so that the technical problems of short service life of the platinum-rhodium thermocouple in temperature measurement application, low thermocouple temperature response speed, high cost and low adhesion in the prior art are solved.
In order to achieve the aim, according to one aspect of the invention, the high-adhesion carbon-proof coating for the surface of the platinum-rhodium thermocouple comprises a first coating material and a second coating material which are alternately arranged, wherein the first coating material is Y-direction2O3Adding 20-30% of Y in the sol-gel2O3The mixture obtained by the superfine powder and the second coating material are obtained by adding Y with the mass fraction of 25-35 percent into the high-temperature adhesive2O3Mixture of ultrafine powders, Y2O3The diameter of the superfine powder is 40nm-60nm, and the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 30 μm-50 μm.
Preferably, the first coating material is oriented in the direction Y2O3Adding 25% of Y in mass fraction into the sol-gel2O3The second coating material is a mixture obtained by adding 30 percent of Y by mass into the high-temperature adhesive2O3Mixture of ultrafine powders, Y2O3The diameter of the superfine powder is 50 nm.
Further, the high-temperature binder is a mixed solution of sodium silicate and potassium silicate, a sodium silicate solution, or a potassium silicate solution.
Preferably, the high temperature binder is a mixed solution of sodium silicate and potassium silicate.
According to another aspect of the invention, a preparation method of a high-adhesion carbon-proof coating on the surface of a platinum-rhodium thermocouple is provided, which comprises the following steps:
(1) to Y2O3Adding 20-30% of Y in the sol-gel2O3Obtaining a first coating material by ultrafine powder, and adding 25-35% of Y by mass fraction into the high-temperature adhesive2O3Ultrafine powder to obtain a second coating materialY2O3The diameter of the superfine powder is 40nm-60 nm;
(2) alternately coating a first coating material and a second coating material on the surface of the platinum-rhodium thermocouple at the speed of 70-90 mm/min until the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 30-50 mu m, and drying at 100-150 ℃ for 2-8 min after each coating.
Further, the step (1) also comprises the steps of carrying out high-temperature treatment on the platinum-rhodium thermocouple at 200-500 ℃ for 0.5-5 h, and then sequentially carrying out ultrasonic cleaning on the platinum-rhodium thermocouple through a sodium hydroxide solution, sulfuric acid, ethanol and deionized water, wherein the cleaning time of each solution is 10-20 min.
Further, step (1) is preferably carried out in the direction of Y2O3Adding 25% of Y in mass fraction into the sol-gel2O3Ultrafine powder to obtain a first coating material, and adding 30% by mass of Y into the high-temperature adhesive2O3Ultrafine powder to obtain a second coating material, Y2O3The diameter of the superfine powder is 50 nm.
Further, in the step (2), preferably, the first coating material and the second coating material are alternately coated on the surface of the platinum-rhodium thermocouple at a speed of 80mm/min until the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 40 μm, and the coating is dried at 120 ℃ for 5min after each coating.
Further, the high-temperature binder is a mixed solution of sodium silicate and potassium silicate, a sodium silicate solution, or a potassium silicate solution.
Further, Y2O3The preparation method of the sol-gel comprises the following steps:
to Y (NO)3)3Adding dilute hydrochloric acid into the aqueous solution to obtain a first mixed solution, enabling the pH of the first mixed solution to be 3, then adding a triethanolamine solution into the first mixed solution to obtain a second mixed solution, enabling the pH of the second mixed solution to be 6, obtaining a third mixed solution, uniformly stirring the third mixed solution, then placing the third mixed solution into a thermostat with the temperature of 20-30 ℃ for standing for 48-72 hours, and obtaining Y2O3Sol-gel.
Furthermore, the triethanolamine solution is obtained by uniformly mixing deionized water and more than or equal to 99.9 percent of triethanolamine according to the volume ratio of 10: 1.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the criteria for judging adhesion are mainly the number of the coating stuck up by the tape and the percentage of the hundred lattices. A total of five grades: 1. ISO class: 5-ASTM rating: 0B, which represents a coating spalling area of greater than 65%. 2. ISO class: 4-ASTM rating: 1B, some squares are partially or completely peeled off, and the peeling area is more than 35-65%. 3. ISO class: ASTM grade 3 ═ ASTM grade: 2B, the coating is partially peeled off or large-area peeled off along the edge of the cut, and even some grid parts are peeled off in a whole piece, and the area is more than 15-35%. 4. ISO class: 2 — ASTM rating: 3B, the peeled area of the edge of the cut and the intersection is more than 5 to 15 percent. 5. ISO class: 1-ASTM rating: 4B, which represents a small piece of coating spalling at the intersection of the cuts, with an actual break in the scribed area of less than or equal to 5%. 6. ISO class: 0 — ASTM rating: 5B, this means that the grid edges are free of any peeling and the cut edges are completely smooth, which is the highest level of adhesion. The invention utilizes a high temperature binder plus Y2O3When the ultrafine powder is used as a coating material, the material can be bonded together due to the viscosity of the ultrafine powder, the prepared carbon-proof coating on the surface of the platinum-rhodium thermocouple has the highest-grade adhesive force of 5B, is less prone to cracking in the oxidation test process, and has a protective inner layer Y2O3The function of the coating.
(2) The coating obtained by the preparation method has better density and higher adhesiveness, and the preparation method only coats the coating and does not need the process of forming a uniform film by high-temperature sintering, thereby improving the adhesive force and reducing the process cost. After each coating, the film is dried for 2min to 8min at the temperature of 100 ℃ to 150 ℃ so that the surface of the film is free of bubbles and is dried, thereby improving the quality of the film and finally forming a uniform and compact film. The triethanolamine is used for effectively controlling the reaction process of sol-gel and improving the dispersibility of the powder by being used as a surfactant.
(3) The invention treats the platinum-rhodium thermocouple at the high temperature of 200-500 ℃ for 0.5-5 h, and then sequentially carries out ultrasonic cleaning by sodium hydroxide solution, sulfuric acid, ethanol and deionized water, so as to remove pollution in the production and transportation processes and improve the quality of subsequent coating. Meanwhile, the cleaning time of each solution is 10min-20min, so that the surface of the platinum-rhodium thermocouple has certain roughness, and the subsequent coating quality is improved.
(4) The invention utilizes Y2O3Sol-gel, compared to armor, clearly does not adversely affect the thermocouple temperature response speed, while also enhancing the adhesion of the film. At Y2O3Adding Y into sol-gel2O3The superfine powder can quickly increase the thickness of the film until the thickness can achieve the effect of protecting the substrate for a long time. At Y2O3With adhesive coatings between the coatings, not only to provide Y2O3The enhancement of the adhesion between the coatings can play a role in protecting the substrate to a certain extent, and most importantly, the effect of reducing the effect of only coating Y2O3The coating is a process step for improving the adhesive force by sintering the material at high temperature, and the production cost is reduced. Y in the coating2O3The binder component is not easily reduced at high temperature to fail, thus ensuring that the thermocouple is used for a long time under a reducing atmosphere of 1600 ℃. The final finished product does not influence the thermoelectric potential-temperature relation of the thermocouple, and has stable temperature-time relation in work. The used materials have low manufacturing cost, the process flow is simple and easy to use, and the production cost is reduced.
Drawings
FIG. 1 is a flow chart of a preparation method of a high-adhesion carbon-resistant coating on the surface of a platinum-rhodium thermocouple.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
A high-adhesion carbon-proof coating on the surface of a platinum-rhodium thermocouple comprises a first coating material and a second coating material which are alternately arranged, wherein the first coating material is Y-direction2O3Adding 20-30% of Y in the sol-gel2O3The mixture obtained by the superfine powder and the second coating material are obtained by adding Y with the mass fraction of 25-35 percent into the high-temperature adhesive2O3Mixture of ultrafine powders, Y2O3The diameter of the superfine powder is 40nm-60nm, and the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 30 μm-50 μm. The high-temperature adhesive is a mixed solution of sodium silicate and potassium silicate, a sodium silicate solution or a potassium silicate solution.
In the preferred embodiment of the present invention, the first coating material is oriented in the direction Y2O3Adding 25% of Y in mass fraction into the sol-gel2O3The second coating material is a mixture obtained by adding 30 percent of Y by mass into the high-temperature adhesive2O3Mixture of ultrafine powders, Y2O3The diameter of the superfine powder is 50nm, and the high-temperature adhesive is a mixed solution of sodium silicate and potassium silicate.
The platinum-rhodium thermocouple used in the embodiment of the invention is a B-type platinum-rhodium thermocouple which is purchased from Beijing Jing navigation ocean technology Limited and has a positive electrode and a negative electrode with the specification of phi 0.3mm x 5cm welded at one end, and the B-type platinum-rhodium wire is a positive grade: platinum 70% rhodium 30%, negative electrode: platinum is 94 percent and rhodium is 6 percent, and the temperature measuring range is 600-1700 ℃.
As shown in fig. 1, a preparation method of a high-adhesion carbon-resistant coating on the surface of a platinum-rhodium thermocouple comprises the following steps:
(1) to Y (NO)3)3Adding dilute hydrochloric acid into the aqueous solution to obtain a first mixed solution, enabling the pH of the first mixed solution to be 3, then adding a triethanolamine solution into the first mixed solution to obtain a second mixed solution, enabling the pH of the second mixed solution to be 6, obtaining a third mixed solution, uniformly stirring the third mixed solution, and then placing the third mixed solution into a thermostat with the temperature of 20-30 ℃ to standStanding for 48-72 h to obtain Y2O3Sol-gel. The triethanolamine solution is obtained by uniformly mixing deionized water and more than or equal to 99.9 percent of triethanolamine according to the volume ratio of 10: 1. To Y2O3Adding 20-30% of Y in the sol-gel2O3Obtaining a first coating material by ultrafine powder, and adding 25-35% of Y by mass fraction into the high-temperature adhesive2O3Ultrafine powder to obtain a second coating material, Y2O3The diameter of the superfine powder is 40nm-60 nm; the platinum-rhodium thermocouple is treated at the high temperature of 200-500 ℃ for 0.5-5 h, and then is sequentially cleaned by sodium hydroxide solution, sulfuric acid, ethanol and deionized water in an ultrasonic manner, wherein the cleaning time of each solution is 10-20 min. The high-temperature adhesive is a mixed solution of sodium silicate and potassium silicate, a sodium silicate solution or a potassium silicate solution.
(2) Alternately coating a first coating material and a second coating material on the surface of the platinum-rhodium thermocouple at the speed of 70-90 mm/min until the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 30-50 mu m, and drying at 100-150 ℃ for 2-8 min after each coating.
Example 1
A preparation method of a high-adhesion carbon-proof coating on the surface of a platinum-rhodium thermocouple comprises the following steps:
(1) to 0.25mol/L of Y (NO)3)3Adding dilute hydrochloric acid into the aqueous solution to obtain a first mixed solution, enabling the pH of the first mixed solution to be 3, then adding a triethanolamine solution into the first mixed solution to obtain a second mixed solution, enabling the pH of the second mixed solution to be 6, obtaining a third mixed solution, uniformly stirring the third mixed solution, then placing the third mixed solution into a thermostat at 25 ℃ for standing for 64 hours to obtain Y2O3Sol-gel. The triethanolamine solution is obtained by uniformly mixing deionized water and more than or equal to 99.9 percent of triethanolamine according to the volume ratio of 10: 1. To Y2O3Adding 25% of Y in mass fraction into the sol-gel2O3Ultrafine powder to obtain a first coating material, and adding 30% by mass of Y into the high-temperature adhesive2O3Ultrafine powder to obtain a second coating material, Y2O3The diameter of the superfine powder is 50 nm; and (3) treating the platinum-rhodium thermocouple at the high temperature of 300 ℃ for 3h, and then sequentially carrying out ultrasonic cleaning on the platinum-rhodium thermocouple by using a sodium hydroxide solution, sulfuric acid, ethanol and deionized water, wherein the cleaning time of each solution is 15 min. The high-temperature adhesive is a mixed solution of sodium silicate and potassium silicate.
(2) And alternately coating the first coating material and the second coating material on the surface of the platinum-rhodium thermocouple at the speed of 80mm/min until the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 40 mu m, and drying at 120 ℃ for 5min after each coating.
Example 2
A preparation method of a high-adhesion carbon-proof coating on the surface of a platinum-rhodium thermocouple comprises the following steps:
(1) to Y (NO)3)3Adding dilute hydrochloric acid into the aqueous solution to obtain a first mixed solution, enabling the pH of the first mixed solution to be 3, then adding a triethanolamine solution into the first mixed solution to obtain a second mixed solution, enabling the pH of the second mixed solution to be 6, obtaining a third mixed solution, stirring the third mixed solution uniformly, and then placing the third mixed solution into a thermostat at 20 ℃ to stand for 72 hours to obtain Y2O3Sol-gel. The triethanolamine solution is obtained by uniformly mixing deionized water and more than or equal to 99.9 percent of triethanolamine according to the volume ratio of 10: 1. To Y2O3Adding 20 percent of Y into the sol-gel2O3Ultrafine powder to obtain a first coating material, and adding 25% by mass of Y into the high-temperature adhesive2O3Ultrafine powder to obtain a second coating material, Y2O3The diameter of the superfine powder is 40 nm; and (3) treating the platinum-rhodium thermocouple at the high temperature of 200 ℃ for 5 hours, and then sequentially carrying out ultrasonic cleaning on the platinum-rhodium thermocouple by using a sodium hydroxide solution, sulfuric acid, ethanol and deionized water, wherein the cleaning time of each solution is 10 min. The high-temperature adhesive is a mixed solution of sodium silicate and potassium silicate, a sodium silicate solution or a potassium silicate solution.
(2) And alternately coating the first coating material and the second coating material on the surface of the platinum-rhodium thermocouple at the speed of 70mm/min until the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 30 mu m, and drying at 150 ℃ for 2min after each coating.
Example 3
A preparation method of a high-adhesion carbon-proof coating on the surface of a platinum-rhodium thermocouple comprises the following steps:
(1) to Y (NO)3)3Adding dilute hydrochloric acid into the aqueous solution to obtain a first mixed solution, enabling the pH of the first mixed solution to be 3, then adding a triethanolamine solution into the first mixed solution to obtain a second mixed solution, enabling the pH of the second mixed solution to be 6, obtaining a third mixed solution, stirring the third mixed solution uniformly, and then placing the third mixed solution into a 30 ℃ thermostat for standing for 48 hours to obtain Y2O3Sol-gel. The triethanolamine solution is obtained by uniformly mixing deionized water and more than or equal to 99.9 percent of triethanolamine according to the volume ratio of 10: 1. To Y2O3Adding 30 percent of Y into the sol-gel2O3Ultrafine powder to obtain a first coating material, and adding 35% by mass of Y into the high-temperature adhesive2O3Ultrafine powder to obtain a second coating material, Y2O3The diameter of the superfine powder is 60 nm; and (3) treating the platinum-rhodium thermocouple at the high temperature of 500 ℃ for 0.5h, and then sequentially carrying out ultrasonic cleaning on the platinum-rhodium thermocouple by using a sodium hydroxide solution, sulfuric acid, ethanol and deionized water, wherein the cleaning time of each solution is 20 min. The high-temperature adhesive is a mixed solution of sodium silicate and potassium silicate, a sodium silicate solution or a potassium silicate solution.
(2) And alternately coating the first coating material and the second coating material on the surface of the platinum-rhodium thermocouple at the speed of 90mm/min until the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 50 mu m, and drying at 100 ℃ for 8min after each coating.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (8)

1. The high-adhesion carbon-proof coating for the surface of the platinum-rhodium thermocouple is characterized by comprising a first coating material and a second coating material which are alternately arranged, wherein the first coating material is Y-direction2O3Adding 20-30% of Y in the sol-gel2O3The mixture obtained by the superfine powder and the second coating material are obtained by adding Y with the mass fraction of 25-35 percent into the high-temperature adhesive2O3Mixture of ultrafine powders, Y2O3The diameter of the superfine powder is 40nm-60nm, and the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 30 μm-50 μm; the high-temperature adhesive is a mixed solution of sodium silicate and potassium silicate, a sodium silicate solution or a potassium silicate solution.
2. The high-adhesion platinum-rhodium thermocouple surface carbon-proof coating as claimed in claim 1, wherein the first coating material is Y-direction2O3Adding 25% of Y in mass fraction into the sol-gel2O3The second coating material is a mixture obtained by adding 30 percent of Y by mass into the high-temperature adhesive2O3Mixture of ultrafine powders, Y2O3The diameter of the superfine powder is 50 nm.
3. A preparation method of a high-adhesion carbon-proof coating on the surface of a platinum-rhodium thermocouple is characterized by comprising the following steps:
(1) to Y2O3Adding 20-30% of Y in the sol-gel2O3Obtaining a first coating material by ultrafine powder, and adding 25-35% of Y by mass fraction into the high-temperature adhesive2O3Ultrafine powder to obtain a second coating material, Y2O3The diameter of the superfine powder is 40nm-60 nm;
(2) alternately coating a first coating material and a second coating material on the surface of the platinum-rhodium thermocouple at a speed of 70-90 mm/min until the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 30-50 mu m, and drying at 100-150 ℃ for 2-8 min after each coating;
the high-temperature adhesive is a mixed solution of sodium silicate and potassium silicate, a sodium silicate solution or a potassium silicate solution.
4. The preparation method of the high-adhesion carbon-resistant coating on the surface of the platinum-rhodium thermocouple, according to claim 3, characterized in that the step (1) further comprises the steps of carrying out high-temperature treatment on the platinum-rhodium thermocouple at 200-500 ℃ for 0.5-5 h, and then sequentially carrying out ultrasonic cleaning on the platinum-rhodium thermocouple through a sodium hydroxide solution, sulfuric acid, ethanol and deionized water, wherein the cleaning time of each solution is 10-20 min.
5. The preparation method of the high-adhesion platinum-rhodium thermocouple surface carbon-proof coating as claimed in claim 3 or 4, wherein the step (1) is carried out in Y direction2O3Adding 25% of Y in mass fraction into the sol-gel2O3Ultrafine powder to obtain a first coating material, and adding 30% by mass of Y into the high-temperature adhesive2O3Ultrafine powder to obtain a second coating material, Y2O3The diameter of the superfine powder is 50 nm.
6. The method for preparing the high-adhesion carbon-proof coating on the surface of the platinum-rhodium thermocouple according to claim 3 or 4, wherein the step (2) alternately coats the first coating material and the second coating material on the surface of the platinum-rhodium thermocouple at a speed of 80mm/min until the thickness of the carbon-proof coating on the surface of the platinum-rhodium thermocouple is 40 μm, and the coating is dried at 120 ℃ for 5min after each coating.
7. The method for preparing the high-adhesion carbon-proof coating on the surface of the platinum-rhodium thermocouple according to claim 3 or 4, wherein Y is2O3The preparation method of the sol-gel comprises the following steps:
to Y (NO)3)3Adding dilute hydrochloric acid into the aqueous solution to obtain a first mixed solution, enabling the pH of the first mixed solution to be 3, then adding a triethanolamine solution into the first mixed solution to obtain a second mixed solution, enabling the pH of the second mixed solution to be 6, obtaining a third mixed solution, uniformly stirring the third mixed solution, then placing the third mixed solution into a thermostat with the temperature of 20-30 ℃ for standing for 48-72 hours, and obtaining Y2O3Sol-gel.
8. The preparation method of the platinum-rhodium thermocouple surface carbon-proof coating with high adhesion as claimed in claim 7, wherein the triethanolamine solution is obtained by uniformly mixing deionized water and more than or equal to 99.9% of triethanolamine according to a volume ratio of 10: 1.
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