CN112063954A - Method for improving high-temperature oxidation resistance of surface of zirconium alloy - Google Patents
Method for improving high-temperature oxidation resistance of surface of zirconium alloy Download PDFInfo
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- 229910001093 Zr alloy Inorganic materials 0.000 title claims abstract description 46
- 230000003647 oxidation Effects 0.000 title claims abstract description 34
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000919 ceramic Substances 0.000 claims abstract description 46
- 229910052751 metal Inorganic materials 0.000 claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 45
- 238000000576 coating method Methods 0.000 claims abstract description 44
- 239000011248 coating agent Substances 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000007751 thermal spraying Methods 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 8
- 229910019829 Cr2AlC Inorganic materials 0.000 claims abstract description 3
- 229910003178 Mo2C Inorganic materials 0.000 claims abstract description 3
- 229910009818 Ti3AlC2 Inorganic materials 0.000 claims abstract description 3
- 229910009817 Ti3SiC2 Inorganic materials 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 58
- 238000005507 spraying Methods 0.000 claims description 35
- 239000002131 composite material Substances 0.000 claims description 28
- 238000000227 grinding Methods 0.000 claims description 16
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 238000000498 ball milling Methods 0.000 claims description 11
- 238000007750 plasma spraying Methods 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000005488 sandblasting Methods 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 7
- 239000011812 mixed powder Substances 0.000 claims description 7
- 238000001291 vacuum drying Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000005551 mechanical alloying Methods 0.000 claims description 2
- 239000002344 surface layer Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005524 ceramic coating Methods 0.000 abstract 1
- 238000005382 thermal cycling Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000011195 cermet Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/17—Metallic particles coated with metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- 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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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/02—Fuel elements
- G21C3/04—Constructional details
- G21C3/06—Casings; Jackets
- G21C3/07—Casings; Jackets characterised by their material, e.g. alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/041—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by mechanical alloying, e.g. blending, milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a method for improving the high-temperature oxidation resistance of the surface of a zirconium alloy, belonging to the field of nuclear structure materials. The method is characterized in that a coating is prepared on the surface of zirconium alloy by adopting thermal spraying, and the coating is prepared by the following raw materials in parts by weight: 80-95 parts of metal phase and 5-20 parts of ceramic phase; the metal phase is one of Ni, Co, NiCrAl and CoCrAl; the ceramic phase is TaC and Mo2C、HfC、Cr2AlC、Ti3SiC2、Ti3AlC2And Ti2One kind of AlC. The invention isThe microstructure of the metal ceramic coating is as follows: metal phases are uniformly dispersed in the ceramic phase; the metal phase is fully melted, the wettability to the ceramic phase is good, but no chemical reaction occurs between the metal phase and the ceramic phase, the ceramic phase particles keep the original shape and structure, and the coating is compact. The method has low cost, good performance and simple manufacturing process under the condition of being exposed to rapid thermal neutrons in an ideal reactor, and can be used for high-throughput preparation.
Description
Technical Field
The invention relates to a method for improving the high-temperature oxidation resistance of the surface of a zirconium alloy, belonging to the field of nuclear structure materials.
Background
Zirconium alloy is a key material of a cladding material of a nuclear reactor element, and has quite good neutron irradiation resistance in a reactor. The development of accident fault-tolerant fuel with excellent high-temperature mechanical property has become one of key technologies and key development directions which are urgently needed to overcome in the nuclear power safety in the world. The growing demand for advanced nuclear applications (temperature, corrosive environment) is probably most likely met by surface protection, coatings can be applied against hot corrosion, erosion and wear, which can also be used as thermal barriers. Although coating technology has been fully accepted in the field of non-nuclear machinery, it is new in nuclear applications. Service conditions in advanced liquid metal reactors (operating temperatures in excess of 550 ℃) and in molten salt reactors may require the addition of coatings that can generate oxides for surface protection. Many such coatings are designed to be consumed over time (aluminum or chromium donors). This means that in future reactors the concept of overall safety and reliability of the coating must be established. Development of a cermet composite coating may help improve the quality and life of zirconium alloys.
The preparation of the coating composite coating on the surface of the zirconium alloy is a simple, convenient, feasible and economic method for improving the high-temperature oxidation resistance and the accident resistance of the surface of the zirconium alloy, the coating composite coating can avoid rapid oxidation of the zirconium alloy in high-temperature steam under accident conditions, has small influence on the thermomechanical behavior of the zirconium alloy, can not obviously change the neutron physical property of a reactor core, and is expected to improve the heat transfer characteristic of the zirconium alloy. Meanwhile, the corrosion rate of the zirconium alloy under the normal operation condition can be reduced by coating the composite coating, so that the service life of the fuel element is prolonged, and the operation cost of the fuel is reduced. Therefore, the development of the zirconium alloy coating technology has great significance for improving the high-temperature oxidation resistance of the surface of the zirconium alloy, prolonging the service life and developing the accident-resistant nuclear power fuel. In view of the above-mentioned key technologies, a low-cost, simple-process, and high-throughput method is needed to improve the high-temperature oxidation resistance of the surface of the zirconium alloy.
Disclosure of Invention
The invention aims to solve the problem that the prior zirconium alloy fails due to rapid oxidation in high-temperature steam when a nuclear power reactor is in service.
The invention is realized by the following technical scheme:
the method for improving the high-temperature oxidation resistance of the surface of the zirconium alloy is simple and low in cost, the coating is prepared on the surface of the zirconium alloy by thermal spraying to improve the high-temperature oxidation resistance of the surface of the zirconium alloy, the coating has good performance under the condition of being exposed to fast thermal neutrons in an ideal reactor, has good tolerance to radiation damage, is suitable for nuclear reactor nuclear structure materials, and solves the problem that the zirconium alloy fails due to fast oxidation in high-temperature steam when the zirconium alloy is in service in a nuclear power reactor.
The coating is prepared from the following raw materials in parts by weight by thermal spraying: 80-95 parts of metal phase and 5-20 parts of ceramic phase.
The metal phase is one of Ni, Co, NiCrAl and CoCrAl.
The ceramic phase is TaC and Mo2C、HfC、Cr2AlC、Ti3SiC2、Ti3AlC2And Ti2One kind of AlC.
Further, the method for improving the high-temperature oxidation resistance of the surface of the zirconium alloy specifically comprises the following steps:
(1) respectively weighing a metal phase and a ceramic phase, uniformly mixing, ball-milling the metal phase and the ceramic phase in a high-energy ball mill by adopting a mechanical alloying method to prepare coated composite powder, and selecting the metal coated ceramic composite powder with the granularity of 40-70 mu m.
(2) And carrying out sand blasting rough treatment and cleaning treatment on the surface of the matrix to be sprayed.
(3) And (3) feeding the metal-coated ceramic composite powder obtained in the step (1) into a powder feeder of spraying equipment, and spraying a coating on the surface of the pretreated substrate obtained in the step (2) by using plasma spraying equipment to improve the high-temperature oxidation resistance of the surface of the zirconium alloy.
Preferably, the conditions for preparing the metal-coated ceramic composite powder of the present invention are: the granularity of the ceramic phase powder is dispersed between 35 and 55 mu m, and the surface layer of the powder is smooth and keeps good spherical; the metal phase powder has different micro-morphologies, and the particle size is about 20-40 mu m; uniformly mixing ceramic phase powder and metal phase powder according to a proportion and grinding in a high-energy ball mill; firstly, drying the mixed powder and the grinding balls in a vacuum drying oven at the temperature of 60-80 ℃ for 5-7 hours before ball milling; in a high-energy ball mill, under the protection of argon, ball milling is carried out at the rotating speed of 150-200 rpm, the total grinding time of 120-140 minutes and the ball-to-material ratio of 10: 1.
Preferably, the plasma spraying conditions of the present invention are: the spraying current is 600-650A, the spraying voltage is 50-55V, the spraying distance is 80-100 mm, and the powder feeding voltage is 7-9V.
The sand blasting treatment performed on the surface of the substrate in the step (2) of the present invention is a conventional thermal spraying roughening treatment in order to increase the deposition rate in the subsequent coating preparation process.
The principle of the invention is as follows: the method is characterized in that a cermet coating is prepared on the surface of a zirconium alloy by thermal spraying, and the microstructure of the cermet coating is as follows: metal phases are uniformly dispersed in the ceramic phase; the metal phase is fully melted, the wettability to the ceramic phase is good, but no chemical reaction occurs between the metal phase and the ceramic phase; the coating has the advantages of easy cracking property, high thermal conductivity (the thermal conductivity coefficient is more than 25W/(m.K)), melting resistance (the melting point is 3500-4000 ℃) and the like, and meanwhile, the coating has a special nano-layered crystal structure, so that the coating has oxidation resistance at high temperature and has excellent mechanical properties such as high strength, high toughness and the like.
The invention has the beneficial effects that:
(1) the method disclosed by the invention is simple in preparation process, the coating is prepared on the surface of the zirconium alloy by utilizing thermal spraying to improve the high-temperature oxidation resistance of the surface of the zirconium alloy, and the problem that the zirconium alloy is invalid due to rapid oxidation in high-temperature steam when the zirconium alloy is in service in a nuclear power reactor is solved.
(2) The microstructure of the metal ceramic composite coating is as follows: ceramic phase is uniformly dispersed and distributed in the metal matrix phase; the metal phase is fully melted, and the wettability to the ceramic phase is good; the coating has the advantages of easy cracking property, high thermal conductivity, high melting resistance and the like, and meanwhile, the special crystal and microstructure enable the coating to have excellent mechanical properties such as high strength, high toughness and the like at high temperature, have good performance under the condition of being exposed to fast thermal neutrons in an ideal reactor, have good tolerance to radiation damage, are suitable for nuclear reactor nuclear structure materials, and are simple in manufacturing process.
Drawings
FIG. 1 is a schematic cross-sectional view of a coating layer according to the method for resisting high temperature oxidation.
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
A method for improving the high-temperature oxidation resistance of the surface of a zirconium alloy comprises the following specific steps:
(1) weighing 80g of metal phase Ni powder with the granularity dispersed between 20 and 40 mu m and 20g of ceramic phase TaC powder with the granularity dispersed between 35 and 55 mu m, uniformly mixing, and drying the mixed powder and grinding balls in a vacuum drying oven at 60 ℃ for 7 hours before ball milling; grinding the mixture in a high-energy ball mill under the protection of argon at the rotating speed of 150rpm for 120 minutes and at the ball-to-material ratio of 10:1 to prepare coated composite powder, and selecting metal-coated ceramic composite powder with the particle size range of 40-70 mu m.
(2) And carrying out sand blasting rough treatment and cleaning treatment on the surface of the matrix to be sprayed.
(3) And (2) preparing and sending the metal-coated ceramic composite powder obtained in the step (1) into a powder feeder of spraying equipment, and spraying a coating on the surface of the pretreated substrate obtained in the step (2) by using plasma spraying equipment, wherein the parameters of thermal spraying are as follows: the spraying current is 600, the spraying voltage is 50V, the spraying distance is 80mm, the powder feeding voltage is 7V, and the high-temperature oxidation resistance of the surface of the zirconium alloy is improved for the obtained coating material.
7000 cycles at 1200 ℃ still gave protection by the thermal cycling test.
Example 2
A method for improving the high-temperature oxidation resistance of the surface of a zirconium alloy comprises the following specific steps:
(1) weighing 95g of metal phase Co powder with the granularity dispersed between 20 and 40 mu m and 5g of ceramic phase HfC powder with the granularity dispersed between 35 and 55 mu m, uniformly mixing, and drying the mixed powder and grinding balls in a vacuum drying oven at 80 ℃ for 5 hours before ball milling; grinding the mixture in a high-energy ball mill under the protection of argon at the rotating speed of 200rpm for 140 minutes and at the ball-to-material ratio of 10:1 to prepare coated composite powder, and selecting metal-coated ceramic composite powder with the particle size range of 40-70 mu m.
(2) And carrying out sand blasting rough treatment and cleaning treatment on the surface of the matrix to be sprayed.
(3) And (2) feeding the metal-coated ceramic composite powder obtained in the step (1) into a powder feeder of spraying equipment, and spraying a coating on the surface of the pretreated substrate obtained in the step (2) by using plasma spraying equipment, wherein the parameters of thermal spraying are as follows: the spraying current is 650A, the spraying voltage is 55V, the spraying distance is 100mm, the powder feeding voltage is 9V, and the high-temperature oxidation resistance of the surface of the zirconium alloy is improved for the obtained coating material.
This example was tested by thermal cycling and still protected at 1200 ℃ for 7000 cycles.
Example 3
A method for improving the high-temperature oxidation resistance of the surface of a zirconium alloy comprises the following specific steps:
(1) weighing 85g of metal phase NiCrAl powder with the granularity dispersed between 20 and 40 mu m and ceramic phase Ti with the granularity dispersed between 35 and 55 mu m3SiC2Uniformly mixing 15g of powder, and drying the mixed powder and grinding balls in a vacuum drying oven at 70 ℃ for 6 hours before ball milling; grinding in a high-energy ball mill under the protection of argon at the rotating speed of 175rpm for 130 minutes and the ball-to-material ratio of 10:1 to prepare coated composite powder, and selecting a metal bag with the particle size range of 40-70 mu mAnd coating ceramic composite powder.
(2) And carrying out sand blasting rough treatment and cleaning treatment on the surface of the matrix to be sprayed.
(3) And (2) feeding the metal-coated ceramic composite powder obtained in the step (1) into a powder feeder of spraying equipment, and spraying a coating on the surface of the pretreated substrate obtained in the step (2) by using plasma spraying equipment, wherein the parameters of thermal spraying are as follows: the spraying current is 625A, the spraying voltage is 52V, the spraying distance is 90mm, the powder feeding voltage is 8V, and the high-temperature oxidation resistance of the surface of the zirconium alloy is improved for the obtained coating material.
This example was tested by thermal cycling and still protected at 1300 ℃ for 7000 cycles.
Example 4
A method for improving the high-temperature oxidation resistance of the surface of a zirconium alloy comprises the following specific steps:
(1) weighing 90g of metal phase CoCrAl powder with the granularity of 20-40 mu m and ceramic phase Ti with the granularity of 35-55 mu m3AlC2Uniformly mixing 10g of powder, and drying the mixed powder and grinding balls in a vacuum drying oven at 60 ℃ for 7 hours before ball milling; grinding the mixture in a high-energy ball mill under the protection of argon at the rotating speed of 150rpm for 120 minutes and at the ball-to-material ratio of 10:1 to prepare coated composite powder, and selecting metal-coated ceramic composite powder with the particle size range of 40-70 mu m.
(2) And carrying out sand blasting rough treatment and cleaning treatment on the surface of the matrix to be sprayed.
(3) And (2) feeding the metal-coated ceramic composite powder obtained in the step (1) into a powder feeder of spraying equipment, and spraying a coating on the surface of the pretreated substrate obtained in the step (2) by using plasma spraying equipment, wherein the parameters of thermal spraying are as follows: the spraying current is 600A, the spraying voltage is 50V, the spraying distance is 80mm, the powder feeding voltage is 7V, and the high-temperature oxidation resistance of the surface of the zirconium alloy is improved for the obtained coating material.
This example was tested by thermal cycling and still protected by 7000 cycles at 1250 ℃.
Example 5
A method for improving the high-temperature oxidation resistance of the surface of a zirconium alloy comprises the following specific steps:
(1) weighing 95g of metal phase Ni powder with the granularity of 20-40 mu m and ceramic phase Ti with the granularity of 35-55 mu m25g of AlC powder is uniformly mixed, and the mixed powder and grinding balls are dried for 7 hours in a vacuum drying oven at 80 ℃ before ball milling; grinding the mixture in a high-energy ball mill under the protection of argon at the rotating speed of 200rpm for 140 minutes and at the ball-to-material ratio of 10:1 to prepare coated composite powder, and selecting metal-coated ceramic composite powder with the particle size range of 40-70 mu m.
(2) And carrying out sand blasting rough treatment and cleaning treatment on the surface of the matrix to be sprayed.
(3) And (2) feeding the metal-coated ceramic composite powder obtained in the step (1) into a powder feeder of spraying equipment, and spraying a coating on the surface of the pretreated substrate obtained in the step (2) by using plasma spraying equipment, wherein the parameters of thermal spraying are as follows: the spraying current is 650A, the spraying voltage is 55V, the spraying distance is 100mm, the powder feeding voltage is 9V, and the high-temperature oxidation resistance of the surface of the zirconium alloy is improved for the obtained coating material.
This example was tested by thermal cycling and still protected by 7000 cycles at 1250 ℃.
Claims (5)
1. A method for improving the high-temperature oxidation resistance of the surface of a zirconium alloy is to adopt thermal spraying to prepare a coating on the surface of the zirconium alloy, and is characterized in that:
the coating is prepared from the following raw materials in parts by weight by thermal spraying: 80-95 parts of metal phase and 5-20 parts of ceramic phase;
the metal phase is one of Ni, Co, NiCrAl and CoCrAl;
the ceramic phase is TaC and Mo2C、HfC、Cr2AlC、Ti3SiC2、Ti3AlC2And Ti2One kind of AlC.
2. The method for improving the high-temperature oxidation resistance of the surface of the zirconium alloy as recited in claim 1, comprising the following steps:
(1) respectively weighing a metal phase and a ceramic phase, uniformly mixing, ball-milling the metal phase and the ceramic phase in a high-energy ball mill by adopting a mechanical alloying method to prepare coated composite powder, and selecting the metal coated ceramic composite powder with the granularity range of 40-70 mu m;
(2) carrying out sand blasting rough treatment and cleaning treatment on the surface of a matrix to be sprayed;
(3) and (3) feeding the metal-coated ceramic composite powder obtained in the step (1) into a powder feeder of spraying equipment, and spraying a coating on the surface of the pretreated substrate obtained in the step (2) by using plasma spraying equipment to improve the high-temperature oxidation resistance of the surface of the zirconium alloy.
3. The method for improving the high-temperature oxidation resistance of the surface of the zirconium alloy according to claim 2, wherein: the granularity of the metal phase powder is 35-55 mu m, and the surface layer of the powder is smooth and keeps spherical; the ceramic phase powder has different micro-morphologies, and the particle size of the ceramic phase powder is 20-40 mu m.
4. The method for improving the high-temperature oxidation resistance of the surface of the zirconium alloy according to claim 2, wherein: the conditions for preparing the metal-coated ceramic composite powder are as follows: uniformly mixing metal phase powder and ceramic phase powder according to a proportion and grinding in a high-energy ball mill; firstly, drying the mixed powder and the grinding balls in a vacuum drying oven at the temperature of 60-80 ℃ for 5-7 hours before ball milling; in a high-energy ball mill, under the protection of argon, ball milling is carried out at the rotating speed of 150-200 rpm, the total grinding time of 120-140 minutes and the ball-to-material ratio of 10: 1.
5. The method for improving the high-temperature oxidation resistance of the surface of the zirconium alloy according to claim 2, wherein: the plasma spraying conditions were: the spraying current is 600-650A, the spraying voltage is 50-55V, the spraying distance is 80-100 mm, and the powder feeding voltage is 7-9V.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430488A (en) * | 2021-06-24 | 2021-09-24 | 西安交通大学 | Nano composite coating for nuclear reactor fuel cladding and preparation method thereof |
| CN114318208A (en) * | 2022-01-07 | 2022-04-12 | 中国科学院合肥物质科学研究院 | Composite coating for lead-based reactor pump impeller and preparation method thereof |
| CN116140613A (en) * | 2023-02-07 | 2023-05-23 | 深圳市氢蓝时代动力科技有限公司 | Corrosion-resistant conductive coating material for metal bipolar plate and preparation method thereof |
Citations (7)
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| CN116140613B (en) * | 2023-02-07 | 2023-11-24 | 深圳市氢蓝时代动力科技有限公司 | Corrosion-resistant conductive coating material for metal bipolar plate and preparation method thereof |
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