CN110172661B - Thermal spraying high-temperature sensor temperature measurement coating and preparation method thereof - Google Patents
Thermal spraying high-temperature sensor temperature measurement coating and preparation method thereof Download PDFInfo
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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
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
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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
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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
Abstract
The invention discloses a thermal spraying high-temperature sensor temperature measurement coating and a preparation method thereof, belonging to the technical field of thermal spraying, wherein a plasma spraying method is adopted to spray an insulating layer with the thickness of 200-300 mu m on a pretreated metal substrate, and then a plasma spraying method is adopted to sequentially spray an inner temperature measurement layer with the thickness of 300-400 mu m, an insulating layer with the thickness of 80-100 mu m and an outer temperature measurement layer with the thickness of 300-400 mu m on the insulating layer, so that the high-temperature sensor temperature measurement coating is finally prepared; in the temperature measuring coating of the sensor, the same end of an inner temperature measuring layer and the same end of an outer temperature measuring layer in the temperature measuring layer are connected through a lead to form a temperature measuring contact, the other end of the temperature measuring layer is respectively connected with the positive end and the negative end of a secondary instrument through leads, the temperature measuring layer directly measures the temperature, converts a temperature signal into a thermoelectromotive force signal, and converts the thermoelectromotive force signal into the temperature of a measured medium through the secondary instrument.
Description
Technical Field
The invention relates to a thermal spraying high-temperature sensor temperature measurement coating and a preparation method thereof, belonging to the technical field of thermal spraying.
Background
The temperature measurement of the high-temperature sensor has wide application requirements in the fields of aerospace, aviation, national defense construction, energy development, heating devices commonly used in life and the like. The temperature measurement in a high-temperature oil well, the temperature measurement in various engine cavities, the attitude control of spacecrafts and spacecrafts, the temperature measurement of heating devices commonly used in life, the flight control of high-speed aircrafts or remote ultra-high-speed missiles, the temperature measurement of heat-resistant cavities and surface parts of jet engines, rockets, missiles, satellites and the like, and particularly the temperature measurement of a high-temperature sensor in a weapon system is indispensable for a power system. Therefore, the method has important significance for the research and development of the temperature measurement of the high-temperature sensor. The main parts of power equipment such as rocket engines, aeroengines, heavy gas turbines, coal-fired gas boilers and the like are in high-temperature severe environments, and the temperature of a combustion chamber even exceeds 2000 ℃. The high-temperature sensor can be used for monitoring parameters such as pressure and temperature of key parts such as a nozzle combustion chamber, a gas compressor and blades in real time, so that the combustion performance and the propulsion efficiency are improved, and the health state of the components is evaluated. The high temperature sensor has been paid high attention to its excellent high temperature working capability, and is one of the important fields of sensor research and one of the high technology which is mastered by the government in various countries. With the continuous development of science and technology, the temperature measurement of the high-temperature sensor is developed towards the diversification of sensitive materials, the diversification of processing technology, the multifunctional integration, the intellectualization and the diversification of research methods, so that the normal work of the temperature measurement of the sensor at high temperature is ensured, and signals are not distorted.
At present, the temperature measurement of the traditional sensor is limited in use temperature, mainly takes the temperature measurement of a silicon-based sensor as a main point, and within the working temperature range of 100 ℃, the commercialized silicon-based sensor is mature in temperature measurement process, small in size and good in performance, but when the silicon-based sensor is used in an environment with the temperature of more than 120 ℃, the internal PN junction can leak electricity, and the performance of the sensor is reduced or even fails. In addition, the silicon-based material can also generate plastic deformation at the temperature of more than 500 ℃, and the requirement of pressure measurement in a high-temperature environment cannot be met.
Disclosure of Invention
Aiming at the problem of the temperature measurement part of the traditional high-temperature sensor, the invention provides a preparation method of a thermal spraying high-temperature sensor temperature measurement coating, wherein the insulating layer with the thickness of 200-300 mu m is sprayed on a pretreated metal substrate by adopting a plasma spraying method, and then an inner temperature measurement layer with the thickness of 300-400 mu m, an insulating layer with the thickness of 80-100 mu m and an outer temperature measurement layer with the thickness of 300-400 mu m are sequentially sprayed on the insulating layer by adopting the plasma spraying method, so that the high-temperature sensor temperature measurement coating is finally prepared; in the temperature measuring coating of the sensor, the same end of an inner measuring layer and the same end of an outer measuring layer in the temperature measuring layer are connected through a lead to form a temperature measuring contact, the other end of the temperature measuring layer is respectively connected with the positive end and the negative end of a secondary instrument through leads, the temperature measuring layer directly measures the temperature, converts a temperature signal into a thermoelectromotive force signal and converts the thermoelectromotive force signal into the temperature of a measured medium through the secondary instrument.
High-temperature-resistant insulating Al for insulating layer2O3、Si3N4Or BN ceramic powder is prepared by a plasma spraying method, and has excellent insulativity and good high temperature resistance; the temperature measuring layer adopts two different alloy powders to form a loop through a lead, the two different alloy powders are connected, and the temperature of the inner temperature measuring layer and the temperature of the outer temperature measuring layer are different to generate thermoelectromotive force.
The preparation method of the temperature measuring coating of the thermal spraying high-temperature sensor comprises the following steps:
(1) the metal matrix is subjected to pre-treatment of polishing, cleaning and sand blasting to ensure that the surface roughness Ra of the metal matrix is more than 24;
the metal matrix is low-carbon steel (45 # steel), a cobalt-based alloy (K640) or a nickel-based alloy (DZ 125, IN 738), and the thickness of the metal matrix is 1.6-4.8 mm;
the metal matrix is in a ring shape or a block shape;
(2) spraying high-temperature-resistant insulating ceramic powder on the metal matrix treated in the step (1) by adopting a plasma spraying methodForming an insulating layer with a thickness of 200-300 μm, wherein the plasma spraying method has a spraying current of 525-550A, N2The speed is 1800-2200 mL/h, the spraying distance is 80-90 mm, the powder feeding voltage is 9-10V, and the preheating temperature of the metal matrix to be sprayed is 450-750 ℃;
the high-temperature resistant insulating ceramic powder is Al2O3Powder, Si3N4Powder or BN powder;
(3) spraying E-type alloy powder or K-type alloy powder on the insulating layer in the step (2) by adopting a plasma spraying method to form an E-type temperature measuring layer or a K-type temperature measuring layer, and preparing a temperature measuring coating of the high-temperature sensor; wherein the spraying current of the plasma spraying method is 475-500A, N2The speed is 1900-2300 mL/h, the spraying distance is 90-100 mm, and the powder feeding voltage is 8-9V;
the E-type alloy powder comprises Cu-Ni alloy powder and Ni-Cr alloy powder, wherein the Cu-Ni alloy powder and the Ni-Cr alloy powder have the same mass, the mass percentage of Cu in the Cu-Ni alloy powder is 60-70%, and the balance is Ni; the mass percent of Ni in the Ni-Cr alloy powder is 80-90%, and the balance is Cr; e-type alloy powder is sprayed by adopting single-way powder feeding to form a temperature measuring layer with a Cu-Ni layer on the inner side and a Ni-Cr layer on the outer side, and the thickness of each layer is 300-400 mu m;
the K-type alloy powder is Ni-Cr alloy powder and Ni-Al alloy powder, and the Ni-Cr alloy powder and the Ni-Al alloy powder have the same mass; wherein the mass percent of Ni in the Ni-Cr alloy powder is 70-80%, and the balance is Ni; wherein the mass percent of Ni in the Ni-Al alloy powder is 90-95%, and the balance is Al; the K-type alloy powder is sprayed by adopting single-way powder feeding to form a temperature measuring layer with an Ni-Cr layer on the inner side and an Ni-Al layer on the outer side, and the thickness of each layer is 300-400 mu m;
wherein the insulating layer with the thickness of 80-100 μm is formed by spraying high-temperature resistant insulating ceramic powder between the inner temperature layer and the outer temperature layer of the temperature measuring layer by a plasma spraying method, wherein the spraying current of the plasma spraying method is 500-525A, N2The speed is 2000-2200 mL/h, the spraying distance is 80-90 mm, and the powder feeding voltage is 8-10V;
the high-temperature resistant insulating ceramic powder is Al2O3Powder, Si3N4Powder or BN powder;
e-type alloy powder is sprayed when the detection temperature is 400-800 ℃; and spraying K-type alloy powder at the detection temperature of 800-1200 ℃.
The invention also aims to provide the temperature measuring coating of the high-temperature sensor prepared by the method.
The invention has the beneficial effects that:
(1) the method measures the temperature through the temperature measuring layer, converts the temperature signal into the thermoelectromotive force signal, and converts the thermoelectromotive force signal into the temperature of the measured medium through the secondary instrument;
(2) the method adopts plasma spraying to obtain the temperature measuring coating of the sensor, thereby realizing the simplification of the structure and the multifunctional integration;
(3) the insulating layer is Al2O3、Si3N4Or BN ceramic coating, which not only avoids short circuit among the metal matrix, the inner temperature measuring layer and the outer temperature measuring layer, but also has good high temperature resistance.
Drawings
FIG. 1 shows a temperature measuring coating of a ring-shaped high-temperature sensor;
FIG. 2 is a block pyrometer sensor thermometric coating.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but the scope of the present invention is not limited to the description.
Example 1: the preparation method of the temperature measuring coating of the thermal spraying high-temperature sensor comprises the following steps:
(1) the circular metal matrix is subjected to pre-treatment of polishing, cleaning and sand blasting to ensure that the surface roughness Ra of the circular metal matrix is more than 24; wherein the annular metal matrix is cobalt-based alloy (K640), and the thickness of the matrix material is 1.6 mm;
(2) spraying Al on the cobalt-based alloy substrate treated in the step (1) by adopting a plasma spraying method2O3The ceramic powder forms an insulating layer having a thickness of 200 μm, wherein the plasma spraying method has a spraying current of 525A, N2The speed is 1800mL/h, the spraying distance is 80mm, the powder feeding voltage is 9V, and the preheating temperature of the metal matrix to be sprayed is 450 ℃;
(3) spraying E-type alloy powder on the insulating layer in the step (2) by adopting a plasma spraying method to form an E-type temperature measuring layer, wherein the E-type alloy powder is Cu-Ni alloy powder and Ni-Cr alloy powder, the Cu-Ni alloy powder and the Ni-Cr alloy powder have the same mass, the mass percentage of Cu in the Cu-Ni alloy powder is 60%, and the balance is Ni; the mass percent of Ni in the Ni-Cr alloy powder is 80 percent, and the balance is Cr; the E-type alloy powder is sprayed by adopting one-way powder feeding to form a Cu-Ni inner temperature measuring layer with the thickness of 300 mu m and a Ni-Cr outer temperature measuring layer with the thickness of 300 mu m, wherein the spraying current of a plasma spraying method is 475A, N2The speed is 1900mL/h, the spraying distance is 90mm, and the powder feeding voltage is 8V;
high-temperature-resistant insulating Si is sprayed between the Cu-Ni inner temperature measuring layer and the Ni-Cr outer temperature measuring layer, namely on the Cu-Ni inner temperature measuring layer by adopting a plasma spraying method3N4Forming an insulating layer with the thickness of 80 mu m by ceramic powder, and then spraying a Ni-Cr outer temperature measuring layer; wherein the plasma spraying method has a spraying current of 500A, N2The speed is 2000mL/h, the spraying distance is 80mm, and the powder feeding voltage is 8V, so that the temperature measuring coating of the high-temperature sensor is prepared (figure 1).
Example 2: the preparation method of the temperature measuring coating of the thermal spraying high-temperature sensor comprises the following steps:
(1) the massive metal matrix is subjected to pre-treatment of polishing, cleaning and sand blasting to ensure that the surface roughness of the massive metal matrix reaches Ra > 24; wherein the bulk metal matrix is nickel-based alloy (DZ 125), and the thickness of the matrix material is 4.8 mm;
(2) spraying Al on the nickel base alloy substrate treated in the step (1) by adopting a plasma spraying method2O3The ceramic powder forms an insulating layer having a thickness of 300 μm, wherein the plasma spraying method has a spraying current of 550A, N2The speed is 2200mL/h, the spraying distance is 90mm, the powder feeding voltage is 10V, and the preheating temperature of the metal matrix to be sprayed is 750 ℃;
(3) spraying K-type alloy powder on the insulating layer in the step (2) by adopting a plasma spraying method to form a K-type temperature measuring layer, wherein the K-type alloy powder is Ni-Cr alloy powder and Ni-Al alloy powder, the Ni-Cr alloy powder and the Ni-Al alloy powder are equal in mass, and the mass percentage of Ni in the Ni-Cr alloy powder70 percent of Cr and the balance of Cr; the mass percent of Ni in the Ni-Al alloy powder is 90 percent, and the balance is Al; the K-type alloy powder is sprayed by one-way powder feeding to form an inner temperature measuring layer of Ni-Cr with the thickness of 400 mu m and an outer temperature measuring layer of Ni-Al with the thickness of 400 mu m, wherein the spraying current of the plasma spraying method is 500A, N2The speed is 2300mL/h, the spraying distance is 100mm, and the powder feeding voltage is 9V;
spraying high-temperature-resistant insulating BN ceramic powder between the Ni-Cr inner temperature measuring layer and the Ni-Al outer temperature measuring layer, namely on the Ni-Cr inner temperature measuring layer by adopting a plasma spraying method to form an insulating layer with the thickness of 100 mu m, and then spraying the Ni-Al outer temperature measuring layer; wherein the plasma spraying method has a spraying current of 525A, N2The speed is 2200mL/h, the spraying distance is 90mm, and the powder feeding voltage is 10V, so that the temperature measuring coating of the high-temperature sensor is prepared (figure 2).
Example 3: the preparation method of the temperature measuring coating of the thermal spraying high-temperature sensor comprises the following steps:
(1) the circular metal matrix is subjected to pre-treatment of polishing, cleaning and sand blasting to ensure that the surface roughness of the circular metal matrix reaches Ra > 24; wherein the annular metal matrix is nickel-based alloy (IN 738), and the thickness of the matrix material is 3.2 mm;
(2) spraying Si on the cobalt-based alloy substrate treated in the step (1) by adopting a plasma spraying method3N4The ceramic powder forms an insulating layer with a thickness of 250 μm, wherein the plasma spraying process has a spraying current of 537A, N2The speed is 2000mL/h, the spraying distance is 85mm, the powder feeding voltage is 9.5V, and the preheating temperature of the metal matrix to be sprayed is 600 ℃;
(3) spraying E-type alloy powder on the insulating layer in the step (2) by adopting a plasma spraying method to form an E-type temperature measuring layer, wherein the E-type alloy powder is Cu-Ni alloy powder and Ni-Cr alloy powder, the Cu-Ni alloy powder and the Ni-Cr alloy powder have the same mass, the mass percentage of Cu in the Cu-Ni alloy powder is 70%, and the balance is Ni; the mass percent of Ni in the Ni-Cr alloy powder is 90 percent, and the balance is Cr; the E-type alloy powder is sprayed by adopting one-way powder feeding to form a Cu-Ni inner temperature measuring layer with the thickness of 350 mu m and a Ni-Cr outer temperature measuring layer with the thickness of 350 mu m, wherein the spraying current of a plasma spraying method is 488A, N2The speed is 2100mL/h, the spraying distance is 95mm,The powder feeding voltage is 8V;
high-temperature-resistant insulating Si is sprayed between the Cu-Ni inner temperature measuring layer and the Ni-Cr outer temperature measuring layer, namely on the Cu-Ni inner temperature measuring layer by adopting a plasma spraying method3N4Forming an insulating layer with the thickness of 90 mu m by ceramic powder, and then spraying a Ni-Cr outer temperature measuring layer; wherein the plasma spraying method has a spraying current of 515A, N2The speed is 2100mL/h, the spraying distance is 85mm, the powder feeding voltage is 9V, and the temperature measuring coating of the high-temperature sensor is prepared.
Example 4: the preparation method of the temperature measuring coating of the thermal spraying high-temperature sensor comprises the following steps:
(1) the massive metal matrix is subjected to pre-treatment of polishing, cleaning and sand blasting to ensure that the surface roughness of the massive metal matrix reaches Ra > 24; wherein the massive metal matrix is low-carbon steel (45 # steel), and the thickness of the matrix material is 2.0 mm;
(2) spraying Si on the low-carbon steel substrate treated in the step (1) by adopting a plasma spraying method3N4The ceramic powder forms an insulating layer having a thickness of 200 μm, wherein the plasma spraying method has a spraying current of 525A, N2The speed is 1900mL/h, the spraying distance is 80mm, the powder feeding voltage is 9V, and the preheating temperature of the metal matrix to be sprayed is 500 ℃;
(3) spraying K-type alloy powder on the insulating layer in the step (2) by adopting a plasma spraying method to form a K-type temperature measuring layer, wherein the K-type alloy powder comprises Ni-Cr alloy powder and Ni-Al alloy powder, the Ni-Cr alloy powder and the Ni-Al alloy powder and the like, the mass percent of Ni in the Ni-Cr alloy powder is 80%, and the balance is Cr; the mass percent of Ni in the Ni-Al alloy powder is 95 percent, and the balance is Al; the K-type alloy powder is sprayed by one-way powder feeding to form an inner temperature measuring layer of Ni-Cr with the thickness of 400 mu m and an outer temperature measuring layer of Ni-Al with the thickness of 400 mu m, wherein the spraying current of the plasma spraying method is 500A, N2The speed is 2300mL/h, the spraying distance is 100mm, and the powder feeding voltage is 9V;
spraying high-temperature-resistant insulating BN ceramic powder between the Ni-Cr inner temperature measuring layer and the Ni-Al outer temperature measuring layer, namely on the Ni-Cr inner temperature measuring layer by adopting a plasma spraying method to form an insulating layer with the thickness of 80 mu m, and then spraying the Ni-Al outer temperature measuring layer; wherein the plasma spraying method has a spraying current of 500A、N2The speed is 2000mL/h, the spraying distance is 80mm, and the powder feeding voltage is 8V, so that the temperature measuring coating of the high-temperature sensor is prepared.
Example 5: the preparation method of the temperature measuring coating of the thermal spraying high-temperature sensor comprises the following steps:
(1) the circular metal matrix is subjected to pre-treatment of polishing, cleaning and sand blasting to ensure that the surface roughness of the circular metal matrix reaches Ra > 24; wherein the annular metal matrix is low-carbon steel (45 # steel), and the thickness of the matrix material is 4.8 mm;
(2) spraying BN ceramic powder on the cobalt-based alloy substrate treated in the step (1) by adopting a plasma spraying method to form an insulating layer with the thickness of 300 mu m, wherein the spraying current of the plasma spraying method is 550A, N2The speed is 2200mL/h, the spraying distance is 90mm, the powder feeding voltage is 10V, and the preheating temperature of the metal matrix to be sprayed is 750 ℃;
(3) spraying E-type alloy powder on the insulating layer in the step (2) by adopting a plasma spraying method to form an E-type temperature measuring layer, wherein the E-type alloy powder is Cu-Ni alloy powder and Ni-Cr alloy powder, the Cu-Ni alloy powder and the Ni-Cr alloy powder have the same mass, the mass percentage of Cu in the Cu-Ni alloy powder is 65%, and the balance is Ni; the mass percent of Ni in the Ni-Cr alloy powder is 85 percent, and the balance is Cr; the E-type alloy powder is sprayed by adopting one-way powder feeding to form a Cu-Ni inner temperature measuring layer with the thickness of 300 mu m and a Ni-Cr outer temperature measuring layer with the thickness of 300 mu m, wherein the spraying current of a plasma spraying method is 475A, N2The speed is 1900mL/h, the spraying distance is 90mm, and the powder feeding voltage is 8V;
high-temperature-resistant insulating Si is sprayed between the Cu-Ni inner temperature measuring layer and the Ni-Cr outer temperature measuring layer, namely on the Cu-Ni inner temperature measuring layer by adopting a plasma spraying method3N4Forming an insulating layer with the thickness of 100 mu m by ceramic powder, and then spraying a Ni-Cr outer temperature measuring layer; wherein the plasma spraying method has a spraying current of 525A, N2The speed is 2200mL/h, the spraying distance is 90mm, and the powder feeding voltage is 10V, so that the temperature measuring coating of the high-temperature sensor is prepared;
Claims (5)
1. a preparation method of a thermal spraying high-temperature sensor temperature measurement coating is characterized by comprising the following specific steps:
(1) the metal matrix is subjected to pre-treatment of polishing, cleaning and sand blasting to ensure that the surface roughness Ra of the metal matrix is more than 24;
(2) spraying high-temperature-resistant insulating ceramic powder on the metal substrate treated in the step (1) by adopting a plasma spraying method to form an insulating layer with the thickness of 200-300 mu m, wherein the spraying current of the plasma spraying method is 525-550A, N2The speed is 1800-2200 mL/h, the spraying distance is 80-90 mm, the powder feeding voltage is 9-10V, and the preheating temperature of the metal matrix to be sprayed is 450-750 ℃;
(3) spraying E-type alloy powder or K-type alloy powder on the insulating layer in the step (2) by adopting a plasma spraying method to form an E-type temperature measuring layer or a K-type temperature measuring layer, and preparing a temperature measuring coating of the high-temperature sensor; wherein the spraying current of the plasma spraying method is 475-500A, N2The speed is 1900-2300 mL/h, the spraying distance is 90-100 mm, and the powder feeding voltage is 8-9V;
the E-type alloy powder comprises Cu-Ni alloy powder and Ni-Cr alloy powder, wherein the Cu-Ni alloy powder and the Ni-Cr alloy powder have the same mass, the mass percentage of Cu in the Cu-Ni alloy powder is 60-70%, and the balance is Ni; the mass percent of Ni in the Ni-Cr alloy powder is 80-90%, and the balance is Cr; e-type alloy powder is sprayed by adopting single-way powder feeding to form a temperature measuring layer with a Cu-Ni layer on the inner side and a Ni-Cr layer on the outer side, and the thickness of each layer is 300-400 mu m;
the K-type alloy powder is Ni-Cr alloy powder and Ni-Al alloy powder, and the Ni-Cr alloy powder and the Ni-Al alloy powder have the same mass; wherein the mass percent of Ni in the Ni-Cr alloy powder is 70-80%, and the balance is Ni; wherein the mass percent of Ni in the Ni-Al alloy powder is 90-95%, and the balance is Al; the K-type alloy powder is sprayed by adopting single-way powder feeding to form a temperature measuring layer with an Ni-Cr layer on the inner side and an Ni-Al layer on the outer side, and the thickness of each layer is 300-400 mu m;
wherein the inner layer and the outer layer of the temperature measuring layer are sprayed with high-temperature resistant insulating ceramic powder by a plasma spraying method to form an insulating layer with the thickness of 80-100 mu mThe spraying current of the plasma spraying method is 500-525A, N2The speed is 2000-2200 mL/h, the spraying distance is 80-90 mm, and the powder feeding voltage is 8-10V;
the high-temperature resistant insulating ceramic powder is Al2O3Powder, Si3N4Powder or BN powder.
2. The preparation method of the temperature measurement coating of the thermal spraying high-temperature sensor according to claim 1, characterized in that: the metal matrix is low-carbon steel, cobalt-based alloy or nickel-based alloy.
3. The preparation method of the temperature measurement coating of the thermal spray high-temperature sensor according to claim 2, characterized in that: the thickness of the metal substrate is 1.6-4.8 mm.
4. The preparation method of the temperature measurement coating of the thermal spraying high-temperature sensor according to claim 1, characterized in that: e-type alloy powder is sprayed when the detection temperature is 400-800 ℃; and spraying K-type alloy powder at the detection temperature of 800-1200 ℃.
5. The temperature measuring coating of the high temperature sensor prepared by the preparation method of the thermal spraying temperature measuring coating of the high temperature sensor as claimed in any one of claims 1 to 4.
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| CN110172661A (en) | 2019-08-27 |
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