CN108950461A - A kind of preparation method suitable for iron base high-temperature alloy surface thermal barrier coating - Google Patents
A kind of preparation method suitable for iron base high-temperature alloy surface thermal barrier coating Download PDFInfo
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- CN108950461A CN108950461A CN201810703389.4A CN201810703389A CN108950461A CN 108950461 A CN108950461 A CN 108950461A CN 201810703389 A CN201810703389 A CN 201810703389A CN 108950461 A CN108950461 A CN 108950461A
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- iron
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- thermal barrier
- barrier coating
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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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
Abstract
A kind of preparation method suitable for iron base high-temperature alloy surface thermal barrier coating belongs to turbine diskware iron-base superalloy and improves temperature and the application field in service life.The method is as follows；The reunion of nanostructured feeds material is handled；Iron substrate is handled；Adhesive layer thermal spraying；Adhesive layer remelting and ceramic layer spray treatment；The heat treatment of As-deposited state coating.The beneficial effect of the present invention compared with the existing technology is: the preparation process of thermal barrier coating through the invention is, it can be achieved that prepare the coating of high life in iron base high-temperature alloy surface, to meet the requirement that iron-base superalloy is used in higher temperature.
Description
Technical field
The invention belongs to turbine diskware iron-base superalloys to improve temperature and the application field in service life, and in particular to Yi Zhongshi
Preparation method for iron base high-temperature alloy surface thermal barrier coating.
Background technique
Iron-base superalloy is the important materials used under the conditions of moderate temperature (lower than 800 DEG C), has preferable medium temperature
Mechanical property and good hot-workability, alloying component is fairly simple, and cost is relatively low.Be mainly used for make aero-engine and
The turbine disk on industry gas turbine can also make guide vane, turbo blade, combustion chamber and other bearing members, fastener
Deng.Another purposes is the exhaust gas turbine made on diesel engine.Since the tissue of precipitation enhancement type based alloy is not sufficiently stable,
Inoxidizability is poor, and elevated temperature strength is insufficient, thus ferrous alloy cannot be applied under the conditions of higher temperature.In order to improve iron-based height
The antioxygenic property of temperature alloy carries out coating/coating preparation investigative technique in iron base high-temperature alloy surface and is carried out extensively,
The technologies such as aluminium are seeped/soak from the first generation, to the preparation of NiCrCoAlY coating, until the development of the technology of thermal barrier coating, antioxygenic property
It is continuously improved, the service life of iron-base superalloy is improved, and can partially replace nickel base superalloy.Currently,
It is inevitable to carry out the preparation of surface covering/coating for the iron-base superalloy applied under harsh conditions, thus occurs very much
The technology of preparing of antioxidant coating, and its inoxidizability can be improved and improve iron-base superalloy by spraying thermal barrier coating
Using temperature, become crucial coating technology.
Iron base high-temperature alloy surface carries out the preparation of thermal barrier coating, due to hot between matrix and thermal barrier coating in use process
The mismatch of the coefficient of expansion affects thermal boundary painting so that thermal barrier coating is easy to crack in Thermal Cycling, or even peels off
The use of layer.The structure for changing thermal barrier coating by technologies such as laser remoltens, can increase the service life of coating, but fail
When, often large area or whole peeling, safe handling property are poor for thermal barrier coating.
Summary of the invention
The purpose of the present invention is to solve existing thermal barrier coatings easily to peel off, the problem of safety difference, provides a kind of suitable
For the preparation method of iron base high-temperature alloy surface thermal barrier coating, tie layer surface remelting is added in spraying process in this method
And As-deposited state coating heat treatment procedure, the inefficacy mechanism of coating thermal shock is changed, ceramic layer can be increased and the mechanical of adhesive layer is tied
With joint efforts, residual stress in coating is reduced, is conducive to the service life for enhancing coating, is provided for the high temperature application of iron-based high temp material
Technology.
To achieve the above object, the technical solution adopted by the present invention is as follows:
A kind of preparation method suitable for iron base high-temperature alloy surface thermal barrier coating, specific step is as follows for the method；
Step 1: nanostructured feeds material reunion processing: use volume fraction for 4% polyvinyl alcohol water solution, in 95 DEG C of constant temperature
Cooled to room temperature after 20 min is heated in water-bath, and organic bond PVA is made；According to YSZ powder: organic bond PVA=
YSZ powder is added in organic bond PVA the volume ratio of 1:3, and the two is uniformly mixed to get arriving using electric mixer
Thick slurry, then slurry is put into ultrasonic cleaning machine and is ultrasonically treated 2 h, ultrasonic power 2000W；Slurry after ultrasound
Placement is heat-treated in an oven, removes the moisture in slurry；It takes out and carries out from baking oven after slurry is completely dried solidification
It is fully ground, screens the particle that average diameter is 50 ~ 70 μm to get nanostructured feeds material is arrived；
Step 2: iron-base superalloy is handled: cleans iron-base superalloy using the dilute hydrochloric acid that volume fraction is 5%, washes
Oxide layer reuses the NaOH solution that volume fraction is 10% and cleans iron-base superalloy, washes away greasy dirt；
Step 3: adhesive layer thermal spraying: carrying out surface spray treatment to step 2 treated ferrous alloy, when spraying, first adopts
5 ~ 10s is preheated on ferrous alloy surface with plasma flame, so that matrix alloy is warming up to 100 ~ 120 DEG C；Adjust plasma
The Ar and H of spraying2Flow, the flow of Ar is 30L/min, H2Flow be 2L/min, setting spray voltage be 50 ~ 55V, spray
Painting electric current be 450A, powder feeding gas be argon gas, air velocity be 30 ~ 35L/min, powder feed rate be 15 ~ 20g/min, spraying away from
From for 100 ~ 110mm, the speed of travel is 80 ~ 100mm/s, arrives adhesive layer through 5 ~ 7 reciprocal sprayings；
Step 4: adhesive layer remelting and ceramic layer spray treatment: adhesive layer is vertically heated using plasma gun, spray gun voltage
For 55 ~ 60V, spray gun electric current is 550A, and spray gun is 30 ~ 50mm at a distance from tie layer surface, and the remelting time is 5 ~ 10s, when viscous
When knot layer starts fusing, ceramic layer spraying is carried out with nanostructured feeds material prepared by step 1 immediately；The actual conditions of spraying are as follows:
55 ~ 60 V of voltage, electric current 550A, powder feeding gas is argon gas, and air velocity is 35 ~ 40L/min, and powder feed rate is 20 ~ 25g/
Min, 100 ~ 110mm of spray distance, 30 ~ 40mm/s of the speed of travel arrive YSZ ceramic layer through 8 ~ 11 reciprocal sprayings；
Step 5: the heat treatment of As-deposited state coating: the YSZ ceramic layer that step 4 obtains is put into drying box, temperature setting 200
~ 300 DEG C, 2 ~ 3 h are kept the temperature, then furnace is cold.
The beneficial effect of the present invention compared with the existing technology is: the preparation process of thermal barrier coating through the invention, can be real
The coating of present iron base high-temperature alloy surface preparation high life, to meet the requirement that iron-base superalloy is used in higher temperature.
Currently, the application of iron-base superalloy mainly carries out NiCrCoAlY spraying or pack cementation aluminizing on surface, improve high temperature oxidation resisting and
Corrosive nature extends the service life of alloy, but alloy is not improved using temperature, and the field of application does not extend.Pass through spray
The YSZ ceramic layer for applying lower thermal conductivity, is remarkably improved the use temperature of alloy.Since the heat of iron-base superalloy and ceramic layer is swollen
Swollen coefficient difference is larger, influences the service life of ceramic layer, is formed simultaneously the whole of ceramic layer and peels off, limits thermal barrier coating
Using.The present invention is by increasing the heat treatment process of adhesive layer remelting and As-deposited state thermal barrier coating, changing in spraying preparation process
The failure mode for having become thermal barrier coating improves the service life of thermal barrier coating, is conducive to thermal barrier coating in iron-base superalloy
In application.If the nickel base superalloy applied in certain high temperature application environments has the iron-based high temp of ceramic layer to close by surface
Gold substitution, even if considering spraying bring fringe cost, the cost of raw material is relatively low, increases economic efficiency.
Detailed description of the invention
Fig. 1 is the surface topography map of As-deposited state thermal barrier coating；
Fig. 2 is the Cross Section Morphology figure of As-deposited state thermal barrier coating；
Fig. 3 is the surface topography map after after heat treatment coating corrosion 190h；
Fig. 4 be after heat treatment coating through the water quenching of 900 DEG C-room temperature 150 times surface topography maps；
Fig. 5 be after heat treatment coating through the water quenching of 900 DEG C-room temperature 150 times Cross Section Morphology figures.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawing, and however, it is not limited to this, all to this
Inventive technique scheme is modified or equivalent replacement, without departing from the spirit of the technical scheme of the invention range, should all cover at this
Among the protection scope of invention.
Specific embodiment 1: present embodiment record is a kind of suitable for iron base high-temperature alloy surface thermal barrier coating
Preparation method, specific step is as follows for the method；
Step 1: nanostructured feeds material reunion processing: use volume fraction for 4% polyvinyl alcohol water solution, in 95 DEG C of constant temperature
Cooled to room temperature after 20 min is heated in water-bath, it is organic bonding of bulky grain that being made, which can make fine particulate material reunite,
Agent PVA；According to YSZ powder: YSZ powder is added in organic bond PVA the volume ratio of organic bond PVA=1:3, uses
The two is uniformly mixed viscous to get arriving by electric mixer (MYP2011-150, the Shanghai Pu Mei Ying instrument and meter Manufacturing Co., Ltd)
The slurry of thick shape, then slurry is put into ultrasonic cleaning machine (NJ10100, Hangzhou Na Jiang Supersonic Tech Corp.) at ultrasound
Manage 2 h, ultrasonic power 2000W；By stirring and being ultrasonically treated, the fine particle in slurry is under the action of organic bond
Sufficiently reunite and grows up；Slurry after ultrasound is placed in baking oven (DZF-6020-220, Hefei Ke Jing Materials Technology Ltd.)
It is heat-treated, removes the moisture in slurry；It takes out and is fully ground from baking oven after slurry is completely dried solidification, screened
Average diameter be 50 ~ 70 μm particle to get arrive sprayable nanostructured feeds material；Nanocrystals YSZ feeding is carried out at reunion
Reason, is the feeding size in order to meet atmospheric plasma spraying；
Step 2: iron-base superalloy is handled: cleans iron-base superalloy using the dilute hydrochloric acid that volume fraction is 5%, washes
Oxide layer reuses the NaOH solution that volume fraction is 10% and cleans iron-base superalloy, washes away greasy dirt；
Step 3: adhesive layer thermal spraying: carrying out surface spray treatment to step 2 treated iron-base superalloy, when spraying,
First using plasma flame preheats 5 ~ 10s in iron base high-temperature alloy surface, so that matrix alloy is warming up to 100 ~ 120 DEG C；Adjustment
The Ar and H of plasma spray coating2Flow, the flow of Ar is 30L/min, H2Flow be 2L/min, setting spray voltage be 50
~ 55V, spraying current 450A, powder feeding gas are argon gas, and air velocity is 30 ~ 35L/min, and powder feed rate is 15 ~ 20g/min,
Spray distance is 100 ~ 110mm, and the speed of travel is 80 ~ 100mm/s, arrives adhesive layer through 5 ~ 7 reciprocal sprayings；
Step 4: adhesive layer remelting and ceramic layer spray treatment can effectively increase the machinery between adhesive layer and ceramic bed boundary
Binding force: vertically heating adhesive layer using plasma gun, spray gun voltage be 55 ~ 60V, spray gun electric current be 550A, spray gun with
The distance of tie layer surface is 30 ~ 50mm, and the remelting time is 5 ~ 10s, when adhesive layer starts fusing, is prepared immediately with step 1
Nanostructured feeds material carry out ceramic layer spraying；The actual conditions of spraying are as follows: voltage 55 ~ 60 V, electric current 550A, powder feeding gas are
Argon gas, air velocity be 35 ~ 40L/min, powder feed rate be 20 ~ 25g/min, 100 ~ 110mm of spray distance, the speed of travel 30 ~
40mm/s arrives YSZ ceramic layer through 8 ~ 11 reciprocal sprayings；
Step 5: the heat treatment of As-deposited state coating: the YSZ ceramic layer that step 4 obtains is put into drying box, temperature setting 200
~ 300 DEG C, 2 ~ 3 h are kept the temperature, then furnace is cold, carries out the heat treatment of As-deposited state coating, can reduce spraying process coating structure
In residual stress, keep the coating surface of preparation smooth, unfused ceramic particle is less, the occlusion of ceramic layer/tie-layer interface
Area is larger, as depicted in figs. 1 and 2.
900 DEG C have been carried out in Na to the thermal barrier coating of GH2132 ferrous alloy surface preparation2SO4And V2O5In salt-mixture
Heat erosion test, after corrosion 100 hours, corrosion product is less, as shown in figure 3, illustrating for preparing coating has stronger heat resistanceheat resistant rotten
Corrosion.
The thermal shock test of 900 DEG C-room temperature water quenching, water quenching have been carried out to the thermal barrier coating of GH2132 ferrous alloy surface preparation
After 150 times, the square shaped coated sample peeling cracked and local in four corners, from Cross Section Morphology, although occurring
Crackle, but ceramic layer, adhesive layer and matrix still keep good combination, to the protection of matrix, there are still as shown in Figure 4 and Figure 5.
It confirms that the failure of coating is different from other techniques and obtains coating to finally result in coating under thermal shock and integrally peel off, side light uses
Adhesive layer remelting and prepares coating, which carry out heat treatment, can be improved the thermal shock resistance of coating, and be conducive to raising coating uses the longevity
Life and safety.
Specific embodiment 2: one kind described in specific embodiment one is suitable for iron base high-temperature alloy surface thermal barrier coating
Preparation method, in step 1, the heat treatment temperature is 150 DEG C, and the time is 5 h.
Specific embodiment 3: one kind described in specific embodiment one is suitable for iron base high-temperature alloy surface thermal barrier coating
Preparation method, in step 4, the remelting time is 10s.
Specific embodiment 4: one kind described in specific embodiment one is suitable for iron base high-temperature alloy surface thermal barrier coating
Preparation method, in step 5, the temperature setting is 250 DEG C.
Specific embodiment 5: one kind described in specific embodiment one is suitable for iron base high-temperature alloy surface thermal barrier coating
Preparation method, in step 5, the temperature setting is 300 DEG C.
Claims (5)
1. a kind of preparation method suitable for iron base high-temperature alloy surface thermal barrier coating, it is characterised in that: the method specifically walks
It is rapid as follows；
Step 1: nanostructured feeds material reunion processing: use volume fraction for 4% polyvinyl alcohol water solution, in 95 DEG C of constant temperature
Cooled to room temperature after 20 min is heated in water-bath, and organic bond PVA is made；According to YSZ powder: organic bond PVA=
YSZ powder is added in organic bond PVA the volume ratio of 1:3, and the two is uniformly mixed to get arriving using electric mixer
Thick slurry, then slurry is put into ultrasonic cleaning machine and is ultrasonically treated 2 h, ultrasonic power 2000W；Slurry after ultrasound
Placement is heat-treated in an oven, removes the moisture in slurry；It takes out and carries out from baking oven after slurry is completely dried solidification
It is fully ground, screens the particle that average diameter is 50 ~ 70 μm to get nanostructured feeds material is arrived；
Step 2: iron-base superalloy is handled: cleans iron-base superalloy using the dilute hydrochloric acid that volume fraction is 5%, washes
Oxide layer reuses the NaOH solution that volume fraction is 10% and cleans iron-base superalloy, washes away greasy dirt；
Step 3: adhesive layer thermal spraying: carrying out surface spray treatment to step 2 treated ferrous alloy, when spraying, first adopts
5 ~ 10s is preheated on ferrous alloy surface with plasma flame, so that matrix alloy is warming up to 100 ~ 120 DEG C；Adjust plasma
The Ar and H of spraying2Flow, the flow of Ar is 30L/min, H2Flow be 2L/min, setting spray voltage be 50 ~ 55V, spray
Painting electric current be 450A, powder feeding gas be argon gas, air velocity be 30 ~ 35L/min, powder feed rate be 15 ~ 20g/min, spraying away from
From for 100 ~ 110mm, the speed of travel is 80 ~ 100mm/s, arrives adhesive layer through 5 ~ 7 reciprocal sprayings；
Step 4: adhesive layer remelting and ceramic layer spray treatment: adhesive layer is vertically heated using plasma gun, spray gun voltage
For 55 ~ 60V, spray gun electric current is 550A, and spray gun is 30 ~ 50mm at a distance from tie layer surface, and the remelting time is 5 ~ 10s, when viscous
When knot layer starts fusing, ceramic layer spraying is carried out with nanostructured feeds material prepared by step 1 immediately；The actual conditions of spraying are as follows:
55 ~ 60 V of voltage, electric current 550A, powder feeding gas is argon gas, and air velocity is 35 ~ 40L/min, and powder feed rate is 20 ~ 25g/
Min, 100 ~ 110mm of spray distance, 30 ~ 40mm/s of the speed of travel arrive YSZ ceramic layer through 8 ~ 11 reciprocal sprayings；
Step 5: the heat treatment of As-deposited state coating: the YSZ ceramic layer that step 4 obtains is put into drying box, temperature setting 200
~ 300 DEG C, 2 ~ 3 h are kept the temperature, then furnace is cold.
2. a kind of preparation method suitable for iron base high-temperature alloy surface thermal barrier coating according to claim 1, feature
Be: in step 1, the heat treatment temperature is 150 DEG C, and the time is 5 h.
3. a kind of preparation method suitable for iron base high-temperature alloy surface thermal barrier coating according to claim 1, feature
Be: in step 4, the remelting time is 10s.
4. a kind of preparation method suitable for iron base high-temperature alloy surface thermal barrier coating according to claim 1, feature
Be: in step 5, the temperature setting is 250 DEG C.
5. a kind of preparation method suitable for iron base high-temperature alloy surface thermal barrier coating according to claim 1, feature
Be: in step 5, the temperature setting is 300 DEG C.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094164A (en) * | 2009-12-15 | 2011-06-15 | 沈阳天贺新材料开发有限公司 | Nanometer zirconium oxide thermal barrier coating and preparation method thereof |
| CN103789715A (en) * | 2014-02-10 | 2014-05-14 | 江苏大学 | Anti-oxidization thermal barrier coating material with long service life and preparation method thereof |
| CN104129990A (en) * | 2014-07-23 | 2014-11-05 | 西安航天复合材料研究所 | Preparation method of hollow spherical YSZ powder for plasma spraying |
| CN105132908A (en) * | 2015-10-16 | 2015-12-09 | 广东电网有限责任公司电力科学研究院 | Gas turbine blade thermal barrier coating bonding layer and preparation method thereof |
| CN105886994A (en) * | 2016-04-13 | 2016-08-24 | 西安交通大学 | Method for manufacturing high-performance layered thermal barrier coating system |
-
2018
- 2018-06-30 CN CN201810703389.4A patent/CN108950461A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094164A (en) * | 2009-12-15 | 2011-06-15 | 沈阳天贺新材料开发有限公司 | Nanometer zirconium oxide thermal barrier coating and preparation method thereof |
| CN103789715A (en) * | 2014-02-10 | 2014-05-14 | 江苏大学 | Anti-oxidization thermal barrier coating material with long service life and preparation method thereof |
| CN104129990A (en) * | 2014-07-23 | 2014-11-05 | 西安航天复合材料研究所 | Preparation method of hollow spherical YSZ powder for plasma spraying |
| CN105132908A (en) * | 2015-10-16 | 2015-12-09 | 广东电网有限责任公司电力科学研究院 | Gas turbine blade thermal barrier coating bonding layer and preparation method thereof |
| CN105886994A (en) * | 2016-04-13 | 2016-08-24 | 西安交通大学 | Method for manufacturing high-performance layered thermal barrier coating system |
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| 刘东亮等: "《材料科学基础》", 30 September 2016, 华东理工大学出版社 * |
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Application publication date: 20181207 |