CN106148874A - Thermal barrier coating that a kind of anti-CMAS smelt deposits corrodes and preparation method thereof - Google Patents
Thermal barrier coating that a kind of anti-CMAS smelt deposits corrodes and preparation method thereof Download PDFInfo
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- CN106148874A CN106148874A CN201610821267.6A CN201610821267A CN106148874A CN 106148874 A CN106148874 A CN 106148874A CN 201610821267 A CN201610821267 A CN 201610821267A CN 106148874 A CN106148874 A CN 106148874A
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Abstract
The invention discloses thermal barrier coating of a kind of anti-CMAS smelt deposits erosion and preparation method thereof, this coating includes: the tack coat being made up of MCrAlY, the ceramic bottom being made up of 8YSZ, and the ceramic top layer being made up of 18YSZ or 48YSZ, the gross thickness of thermal barrier coating is than for 1:1～0.05:1 less than 500 μm, ceramic top layer and ceramic bottom layer thickness.Preparation method will prepare the MCrAlY powder of tack coat for (1), prepare 8YSZ powder and 18YSZ or the 48YSZ powder of ceramic layer, dry in an oven；(2) preparation (4) spraying 8YSZ pottery bottom (5) of spraying sample pre-treatment (3) tack coat is in 8YSZ pottery bottom surface spraying 18YSZ or 48YSZ ceramic top layer.Height Y content ceramic top layer heat-proof quality of the present invention significantly improves relative to 8YSZ with high-temperature stability, more it is essential that this thermal barrier coating has the resist melt CMAS deposit protective capacities of excellence.
Description
Technical field
The present invention relates to a kind of thermal barrier coating and preparation method thereof, particularly relate to the thermal boundary of a kind of resist melt sediment erosion
Coating and preparation method thereof.
Background technology
Thermal barrier coating TBCs (Thermal barrier coatings) technology be in high-performance gas turbogenerator not
The key technology that can or lack, is to improve gas turbine hot-end component to use temperature, extends the effective means of its service life.Tradition
YSZ thermal barrier coating be often referred to 8YSZ (i.e. 6～8wt%Y2O3Partially stabilized ZrO2) thermal barrier coating, at home and abroad have been obtained for
Substantial amounts of actual application, but, during using the improving constantly and use of temperature along with gas turbine hot-end component, operating mode is more
That sends out is severe, and traditional thermal barrier coating can not meet and burns heat insulation, the high-temperature stability of height, high temperature resistance erosion and high temperature resistance
The requirement of knot performance.
When gas engine works, owing in air, micronic dust (microgranule etc. in ice crystal, volcanic ash or air) suction is started
Machine, and motor head abrasive dust etc. enters in combustor, causes rich in CaO-MgO-Al2O3-SiO2Material is molten in flame stream
Melt, and be deposited on gas-turbine unit turbine blade high temperature surface, form multi-phase complex glass phase substance C MAS (CaO-MgO-
Al2O3-SiO2).Use the difference of environment according to gas-turbine unit, the micro amount of oxygen compound of Ni, FeTi and Cr is likely to mix
In CMAS, CMAS has relatively low fusing point (1190～1260 DEG C), and in the presence of having sulfur impurity, fusing point can be lower.Work as CMAS
When being deposited on thermal barrier coating surface, wettable outer layer 8YSZ also penetrates in the hole within thermal barrier coating, makes hole and column
Crystal boundary reduces even to be lost, thus reduces the strain tolerance limit of coating, causes the too early peeling of thermal barrier coating；More seriously
Ca in CMAS2+Ion can diffuse into coating grain boundary sites, thus replaces in tradition 8YSZ coating yittrium oxide as high-temperature stable
Agent, thus the high-temperature stability of 8YSZ thermal barrier coating is greatly lowered；The multi-phase composites kind that additionally CMAS is formed, part melts mutually
Melt state and can dissolve 8YSZ coating, form increasingly complex thing phase, cause 8YSZ coating powderyization and accelerate to peel off inefficacy.
Form the particle size tiny (several microns～micron up to a hundred) of CMAS owing to sucking electromotor, use sandboard etc. to prevent
The mode of protecting can not solve, and raises with gas turbine engine temperature, and CMAS seeping and acceleration thermal barrier coating lost efficacy
Effect can be multiplied.CMAS guard technology, has become as domestic and international thermal barrier coating academia and engineering circles is paid close attention to jointly at present
Key problem.
At present thermal barrier coating anti-CMAS guard technology mainly has a three types: 1) resist melt CMAS osmosis type: with metal, oxygen
Compound and non-oxidized substance are main, mainly have higher consistency, simultaneously relatively big with melted CMAS angle of wetting, delay CMAS to adhere to
And infiltration, such as Pd-Ag, Pt, SiC, Ta2O3、MgAlO4Deng, additionally top layer compact texture can also play and hinder CMAS to penetrate into
Purpose；2) response type is sacrificed: sacrificial coating reacts when referring to contact with CMAS under high temperature and makes its fusing point raise or stickiness
The coating increased, such as Al2O3, MgO, CaO, Sc2O3, SiO2, MgAlO4Deng, wherein alumina dissolution is in CMAS, can make to connect
Touch interface Al content to raise, thus obtain dystectic anorthite phase, delay CMAS to penetrate into；3) nonwetting type coating: to molten
Melt CMAS relatively big, such as noble metal, AlN, BN, SiC, MoSi with coating surface angle of wetting2、SiO2Etc., the most also part is bionical
Structure, can play nonwetting effect.
Above-mentioned technology rests on laboratory stage, technical many Shortcomings: 1 more) and the boundary of thermal barrier coating ceramic coating
Face consistency problem is difficult to solve, including toughness, elastic modelling quantity or or chemical compatibility, although as MgO and CaO can sacrifice
Reaction, but also zirconia-based ceramic layer can be produced ion diffusion, change the high-temperature stability of zirconia-based material；2) expensive
Metal cost and portion of material are not suitable for being applied to high-temperature gradient and the Service Environment that colds and heat succeed each other, and precious metal material cost is relatively
Height, prepares difficulty at large complicated profile piece surface relatively big, overcomes the most very well and realize good preparation；Part pottery
Porcelain such as AlN, BN, SiC etc., self is more crisp, there is also the problems such as oxidation ablation under high temperature simultaneously, can play CMAS from principle
Protective action, but substantially can not realize applying in real working condition.
So that overcome above-mentioned difficulties, based on modified optimization or the surface texture optimization of zirconia-based material, not
On the premise of improving material fundamental characteristics (physical property high temperature resistant, hot, anti-thermal shock etc.), it is achieved excellent anti-CMAS deposit protection energy
The emphasis direction of Li Shi various countries scientist research.
Summary of the invention
Present invention is primarily targeted at the thermal barrier coating and preparation side thereof providing a kind of anti-CMAS smelt deposits to corrode
Method, to overcome thermal barrier coating problem of premature failure in the environment that CMAS smelt deposits exists in prior art.
The invention discloses the thermal barrier coating that a kind of anti-CMAS smelt deposits corrodes, this thermal barrier coating includes:
The tack coat being made up of MCrAlY, the ceramic bottom being made up of 8YSZ, and by 18YSZ (18wt%Y2O3-ZrO2)
Or 48YSZ (48wt%Y2O3-ZrO2, chemical formula: 2ZrO2·Y2O3) ceramic top layer that constitutes, the gross thickness of this thermal barrier coating is
Less than 500 μm, ceramic top layer and ceramic bottom layer thickness than for 1:1～0.05:1；Wherein M is Ni or NiCo.
Anti-CMAS smelt deposits of the present invention corrode thermal barrier coating, wherein, described adhesive layer thickness be 90～
110μm。
The invention also discloses the preparation method of thermal barrier coating that a kind of anti-CMAS smelt deposits corrodes, wherein, including
Following steps:
Step one: the MCrAlY powder of tack coat will be prepared, prepare the 8YSZ powder of ceramic layer and 18YSZ or
48YSZ powder, dries in an oven；
Step 2: spraying sample pre-treatment；
Step 3: the preparation of tack coat, uses HVAF mode to spray MCrAlY tack coat；
Step 4: using plasma spraying mode to spray 8YSZ pottery bottom, spraying parameter is: plasma spraying merit
Rate 40～60kW, powder feeding rate 20～40g/min, spray distance 70～110mm；And
Step 5: use plasma spraying mode in 8YSZ pottery bottom surface spraying 18YSZ or 48YSZ ceramic top layer,
Spraying parameter is: plasma spraying power 45～60kW, powder feeding rate 20～40g/min, spray distance 70～110mm；
Wherein, the gross thickness of thermal barrier coating is than for 1:1～0.05 less than 500 μm, ceramic top layer and ceramic bottom layer thickness:
1, M is Ni or NiCo.
The preparation method of the thermal barrier coating that smelt deposits of the present invention corrodes, wherein, described MCrAlY tack coat
Spraying coating process be oxygen flow 38～40L/h, kerosene oil flow 18～22L/h, powder sending quantity 45～55g/min, spray distance 200
～300mm, coating thickness 90～110 μm.
The preparation method of the thermal barrier coating that anti-CMAS smelt deposits of the present invention corrodes, wherein, described powder exists
Baking oven is dried under the conditions of 90～110 DEG C 60～120min.
The preparation method of the thermal barrier coating that anti-CMAS smelt deposits of the present invention corrodes, wherein, described step 2
For sample acetone to be sprayed is carried out, to remove specimen surface greasy dirt, then carries out blasting treatment, finally enter with air gun
Row air blowing treatment, to remove specimen surface residual sand grains.
The preparation method of the thermal barrier coating that anti-CMAS smelt deposits of the present invention corrodes, wherein, at described sandblasting
Reason process conditions are pressure 0.1～0.3MPa, and sandblasting distance 60～80mm, sandblasting angle 70～80 °, sand used is 20～60 mesh
Emergy.
The preparation method of the thermal barrier coating that anti-CMAS smelt deposits of the present invention corrodes, wherein, at described air blowing
Reason, for using air gun, is carried out under 0.3～0.5MPa pressure.
The preparation method of the thermal barrier coating that anti-CMAS smelt deposits of the present invention corrodes, wherein, described supersonic speed
The barrel length of flame spray device is 100mm.
The preparation method of the thermal barrier coating that anti-CMAS smelt deposits of the present invention corrodes, wherein, described plasma
For normal atmospheric plasma spraying, (normal atmospheric plasma spraying equipment used is for using tradition 9MB type spray gun and correspondence in spraying
Control system) or high energy plasma sprays, and (high energy plasma spraying equipment used has high energy, Gao Han, high speed and high deposition effect
Rate, usual equipment net power is up to more than 60kW, it is possible to achieve higher sedimentation rate and deposition quality).
Beneficial effects of the present invention:
(1) present invention uses Emission in Cubic to be main ceramic top layer (18YSZ or 48YSZ), and this top layer has relatively low porosity
(≤10%), and due to Y2O3Content is higher, and at high temperature, high concentration Y element enters in CMAS, forms thin densification
Ca4Y6(SiO4)6The zirconium oxide mixed layer of O and Emission in Cubic, the fusing point of this densified thin layer is higher than CMAS smelt deposits, can hinder
Hinder CMAS smelt deposits under high temperature that thermal barrier coating is further destroyed；
(2) ceramic top layer of the present invention and pottery bottom are all YSZ structure, have good interphase match between the two
Property, and thermal barrier coating of the present invention has high temperature resistant, the characteristic of lower thermal conductivity；
(3) though resist melt deposit thermal barrier coating of the present invention is double-decker, but tradition 8YSZ thermal barrier coating system is not changed
Standby technique, still can use normal atmospheric plasma spraying or high-temperature plasma spraying coating process to prepare, low cost of manufacture, and can be with
8YSZ pottery bottom is prepared continuously.
Accompanying drawing explanation
Fig. 1 is 48YSZ/8YSZ coating 1250 DEG C, SEM microscopic appearance figure after 2h CMAS infiltration；
Fig. 2 is 48YSZ/8YSZ coating 1250 DEG C, SEM microscopic appearance figure after 5h CMAS infiltration；
Fig. 3 is 8YSZ coating 1250 DEG C, SEM microscopic appearance figure after 2h CMAS infiltration；
Fig. 4 is 8YSZ coating 1250 DEG C, SEM microscopic appearance figure after 5h CMAS infiltration.
Detailed description of the invention
The present invention uses normal atmospheric plasma spraying (using 9MB type plasma spray gun) or high energy plasma spraying side
Formula prepares 18YSZ/8YSZ or 48YSZ/8YSZ coating, and ceramic top layer has good high temperature insulating performance and high-temperature stability
Can, meanwhile, ceramic top layer has the resist melt CMAS deposit protective capacities of excellence, coating prepared by the method and metallic substrates
Coupling is good, and the bond strength of coating is 25～40MPa, and ceramic top layer porosity is less than 10%, the preparation method bag of this coating
Include:
Step one: 8YSZ powder and 18YSZ or the 48YSZ powder of ceramic layer will be prepared, and prepare tack coat
MCrAlY (M is Ni or NiCo) powder, dries 60～120min in an oven under the conditions of 100 ± 10 DEG C.
Step 2: spraying sample pre-treatment, is carried out sample acetone to be sprayed, to remove specimen surface greasy dirt,
Then use 20～60 mesh emergies carry out blasting treatment, blasting craft condition is pressure 0.1～0.3MPa, sandblasting distance 60～
80mm, sandblasting angle 70～80 °, use high pressure air rifle after blasting treatment, under 0.3～0.5MPa pressure, carry out air blowing treatment,
To remove specimen surface residual sand grains.
Step 3: the preparation of tack coat, uses supersonic velocity flame plating equipment (barrel length 100mm) spraying MCrAlY to glue
Knot layer, spraying coating process is oxygen flow 38～40L/h, kerosene oil flow 18～22L/h, powder sending quantity 45～55g/min, spray distance
200～300mm, coating thickness 100 ± 10 μm；Wherein, M is Ni or NiCo.
Step 4: use normal atmospheric plasma spraying or high energy plasma spraying equipment spraying 8YSZ pottery bottom, spray
Painting technological parameter is: plasma spraying power 40～60kW, powder feeding rate 20～40g/min, spray distance 70～110mm.
Step 5: use normal atmospheric plasma spraying equipment or high energy plasma spraying equipment spraying 18YSZ or 48YSZ
Ceramic top layer, spraying parameter is: plasma spraying power 45～60kW, powder feeding rate 20～40g/min, spray distance 70～
110mm。
Wherein, ceramic top layer and ceramic bottom layer thickness are than for 1:1～0.05:1, and thermal barrier coating gross thickness is less than 500 μm.
The ceramic bottom that the thermal barrier coating that the anti-CMAS smelt deposits prepared as stated above corrodes is made up of 8YSZ, with
And by 18YSZ (18wt%Y2O3-ZrO2) or 48YSZ (48wt%Y2O3-ZrO2, chemical formula: 2ZrO2·Y2O3) pottery that constitutes
Top layer, ceramic top layer and ceramic bottom layer thickness are than for 1:1～0.05:1, and the gross thickness of thermal barrier coating is less than 500 μm；Additionally also
Including the tack coat being made up of MCrAlY, adhesive layer thickness is 100 ± 10 μm, and wherein M is Ni or NiCo.
Below by specific embodiment, technical solution of the present invention is described in detail.
Embodiment 1:
Step one: (Ni22Cr6Al1Y, wherein the mass fraction of Cr is 22%, and the mass fraction of Al is to take NiCrAlY
The mass fraction of 6%, Y is 1%, and remaining is Ni) tack coat powder, 8YSZ powder, 48YSZ powder be some, and use before spraying and dry
Case dries 60min under the conditions of 90 DEG C.
Step 2: spraying sample pre-treatment, is carried out sample acetone to be sprayed, removes specimen surface greasy dirt, make
Carrying out blasting treatment with 20 mesh emergies, blasting craft condition is pressure 0.1MPa, sandblasting distance 60mm, sandblasting angle 80 °, spray
Sand uses high pressure air rifle after processing, and carries out air blowing treatment under 0.3MPa pressure, removes specimen surface residual sand grains.
Step 3: prepared by metal bonding coating, uses supersonic velocity flame plating equipment, length 100mm gun barrel, spraying
NiCrAlY tack coat, spraying coating process is oxygen flow 38L/h, kerosene oil flow 18L/h, powder sending quantity 55g/min, spray distance
200mm, coating thickness 90 μm.
Step 4: using normal atmospheric plasma spraying equipment to prepare 8YSZ pottery bottom, main spraying parameter is:
Plasma spraying power 40kW, powder feeding rate 20g/min, spray distance 70mm, coating thickness 90 μm.
Step 5: use normal atmospheric plasma spraying equipment prepare 48YSZ ceramic layer, spraying parameter is: wait from
Sub-spray power 45kW, powder feeding rate 20g/min, spray distance 100mm, spray-on coating thickness 90 μm.
48YSZ ceramic top layer prepared by embodiment 1 has carried out porosity test, and top layer porosity size is 9.8%,
The ceramic layer bond strength size prepared at the process conditions is 35.5MPa, and the gross thickness size of ceramic layer is 180 μm, pottery
Porcelain top layer and ceramic bottom layer thickness are 270 μm than for 1:1, ceramic layer and tack coat gross thickness；Under the conditions of 1100 DEG C, this coating
Effect of heat insulation reached 170 DEG C, at 1200 DEG C, under 24h hot conditions, CMAS depth of penetration is 22 μm；At 1250 DEG C, 2～
Under the conditions of 5h, CMAS depth of penetration is less than 20 μm (as shown in Figure 1, Figure 2).
Embodiment 2:
Step one: (Ni25Cr8Al0.8Y, wherein the mass fraction of Cr is 25%, and the mass fraction of Al is to take NiCrAlY
The mass fraction of 8%, Y is 0.8%, and remaining is Ni) tack coat powder, 8YSZ powder, 18YSZ powder be some, use before spraying
Baking oven dries 120min under the conditions of 110 DEG C.
Step 2: spraying sample pre-treatment, is carried out sample acetone to be sprayed, removes specimen surface greasy dirt, make
Carrying out blasting treatment with 60 mesh emergies, blasting craft condition is pressure 0.3MPa, sandblasting distance 80mm, sandblasting angle 70 °, spray
Sand uses high pressure air rifle after processing, and carries out air blowing treatment under 0.5MPa pressure, removes specimen surface residual sand grains.
Step 3: prepared by metal bonding coating, uses supersonic velocity flame plating equipment, length 100mm gun barrel, spraying
NiCrAlY tack coat, spraying coating process is oxygen flow 40L/h, kerosene oil flow 22L/h, powder sending quantity 55g/min, spray distance
300mm, coating thickness 110 μm.
Step 4: using normal atmospheric plasma spraying equipment to prepare 8YSZ pottery bottom, main spraying parameter is:
Plasma spraying power 45kW, powder feeding rate 25g/min, spray distance 110mm, coating thickness 400 μm.
Step 5: use normal atmospheric plasma spraying equipment prepare 18YSZ ceramic layer, spraying parameter is: wait from
Sub-spray power 52kW, powder feeding rate 30/min, spray distance 70mm, spray-on coating thickness 20 μm.
18YSZ ceramic top layer prepared by embodiment 2 has carried out porosity test, and top layer porosity size is 5.4%,
The ceramic layer bond strength size prepared at the process conditions is 35.2MPa, and the gross thickness size of ceramic layer is 420 μm, pottery
Porcelain top layer and ceramic bottom layer thickness are 530 μm than for 0.05:1, ceramic layer and tack coat gross thickness；Under the conditions of 1100 DEG C, should
The effect of heat insulation of coating has reached 165 DEG C, and at 1200 DEG C, under 24h hot conditions, CMAS depth of penetration is 24 μm；At 1250 DEG C,
Under the conditions of 2～5h, CMAS depth of penetration is less than 17 μm.
Embodiment 3:
Step one: (Ni22Co20Cr8Al1Y, wherein the mass fraction of Co is 22%, and the quality of Cr is divided to take NiCoCrAlY
Number is 20%, and the mass fraction of Al is 8%, and the mass fraction of Y is 1%, and remaining is Ni) tack coat powder, 8YSZ powder,
48YSZ powder is some, uses baking oven to dry 60min under the conditions of 100 DEG C before spraying.
Step 2: spraying sample pre-treatment, is carried out sample acetone to be sprayed, removes specimen surface greasy dirt, make
Carrying out blasting treatment with 60 mesh emergies, blasting craft condition is pressure 0.2MPa, sandblasting distance 65mm, sandblasting angle 75 °, spray
Sand uses high pressure air rifle after processing, and carries out air blowing treatment under 0.5MPa pressure, removes specimen surface residual sand grains.
Step 3: prepared by metal bonding coating, uses supersonic velocity flame plating equipment, length 100mm gun barrel, spraying
NiCoCrAlY tack coat, spraying coating process is oxygen flow 39L/h, kerosene oil flow 20L/h, powder sending quantity 50g/min, spray distance
150mm, coating thickness 100 μm.
Step 4: using high energy plasma spraying equipment to prepare 8YSZ pottery bottom, main spraying parameter is: high energy
Plasma spraying power 50kW, powder feeding rate 40g/min, spray distance 80mm, coating thickness 200 μm.
Step 5: using high energy plasma spraying equipment to prepare 48YSZ ceramic layer, spraying parameter is: plasma spray
It is coated with power 60kW, powder feeding rate 40g/min, spray distance 100mm, coating thickness 200 μm.
48YSZ ceramic top layer prepared by embodiment 3 has carried out porosity test, and top layer porosity size is 3.5%,
The ceramic layer bond strength size prepared at the process conditions is 38.4MPa, and the gross thickness size of ceramic layer is 400 μm, pottery
Porcelain bottom and ceramic top layer thickness are 500 μm than for 1:1, ceramic layer and tack coat gross thickness；Under the conditions of 1100 DEG C, this coating
Effect of heat insulation reached 175 DEG C, at 1200 DEG C, under 24h hot conditions, CMAS depth of penetration is 18 μm；At 1250 DEG C, 2～
Under the conditions of 5h, CMAS depth of penetration is less than 15 μm.
Embodiment 4:
Step one: (Ni22Co17Cr12Al0.8Y0.3Hf0.2Si, wherein the mass fraction of Co is to take NiCoCrAlY
The mass fraction of 22%, Cr is 17%, and the mass fraction of Al is 12%, and the mass fraction of Y is 0.8%, and the mass fraction of Hf is
The mass fraction of 0.3%, Si is 0.2%, and remaining is Ni) tack coat powder, 8YSZ powder, 48YSZ powder be some, make before spraying
Under the conditions of 100 DEG C, 100min is dried with baking oven.
Step 2: spraying sample pre-treatment, is carried out sample acetone to be sprayed, removes specimen surface greasy dirt, make
Carrying out blasting treatment with 40 mesh emergies, blasting craft condition is pressure 0.2MPa, sandblasting distance 75mm, sandblasting angle 75 °, spray
Sand uses high pressure air rifle after processing, and carries out air blowing treatment under 0.2MPa pressure, removes specimen surface residual sand grains.
Step 3: prepared by metal bonding coating, uses supersonic velocity flame plating equipment, length 100mm gun barrel, spraying
NiCoCrAlY tack coat, spraying coating process is oxygen flow 40L/h, kerosene oil flow 21L/h, powder sending quantity 50g/min, spray distance
250mm, coating thickness 105 μm.
Step 4: use Conventional plasma spraying equipment prepare 8YSZ pottery bottom, main spraying parameter is: wait from
Sub-spray power 50kW, powder feeding rate 30g/min, spray distance 80mm, coating thickness 200 μm.
Step 5: using high energy plasma spraying equipment to prepare 48YSZ ceramic layer, spraying parameter is: plasma spray
It is coated with power 50kW, powder feeding rate 30g/min, spray distance 110mm, coating thickness 100 μm.
48YSZ ceramic top layer prepared by embodiment 4 has carried out porosity test, and top layer porosity size is 6.9%,
The ceramic layer bond strength size prepared at the process conditions is 38.5MPa, and the gross thickness size of ceramic layer is 300 μm, pottery
Porcelain bottom and ceramic top layer Thickness ratio are 0.5:1, and ceramic layer and tack coat gross thickness are 405 μm；Under the conditions of 1100 DEG C, this painting
The effect of heat insulation of layer has reached 169 DEG C, and at 1200 DEG C, under 24h hot conditions, CMAS depth of penetration is 15 μm；At 1250 DEG C, 2
～under the conditions of 5h, CMAS depth of penetration is less than 16 μm.
Embodiment 5:
Step one: (Ni22Co17Cr12Al0.8Y, wherein the mass fraction of Co is 22%, the quality of Cr to take NiCoCrAlY
Mark is 17%, and the mass fraction of Al is 12%, the mass fraction of Y be 0.8% remaining be Ni) tack coat powder, 8YSZ powder,
48YSZ powder is some, uses baking oven to dry 110min under the conditions of 105 DEG C before spraying.
Step 2: spraying sample pre-treatment, is carried out sample acetone to be sprayed, removes specimen surface greasy dirt, make
Carrying out blasting treatment with 20 mesh emergies, blasting craft condition is pressure 0.3MPa, sandblasting distance 70mm, sandblasting angle 75 °, spray
Sand uses high pressure air rifle after processing, and carries out air blowing treatment under 0.2MPa pressure, removes specimen surface residual sand grains.
Step 3: prepared by metal bonding coating, uses supersonic velocity flame plating equipment, length 100mm gun barrel, spraying
NiCoCrAlY tack coat, spraying coating process is oxygen flow 39L/h, kerosene oil flow 20L/h, powder sending quantity 45g/min, spray distance
200mm, coating thickness 100 μm.
Step 4: using normal atmospheric plasma spraying equipment to prepare 8YSZ pottery bottom, main spraying parameter is:
Plasma spraying power 45kW, powder feeding rate 25g/min, spray distance 80mm, coating thickness 150 μm.
Step 5: using high energy plasma spraying equipment to prepare 48YSZ ceramic layer, spraying parameter is: plasma spray
It is coated with power 60kW, powder feeding rate 40g/min, spray distance 110mm, coating thickness 150 μm.
48YSZ ceramic top layer prepared by embodiment 5 has carried out porosity test, and top layer porosity size is 3.8%,
The ceramic layer bond strength size prepared at the process conditions is 45.8MPa, and the gross thickness size of ceramic layer is 300 μm, pottery
Porcelain bottom and ceramic top layer thickness are 400 μm than for 1:1, ceramic layer and tack coat gross thickness；Under the conditions of 1100 DEG C, this coating
Effect of heat insulation reached 165 DEG C, at 1200 DEG C, under 24h hot conditions, CMAS depth of penetration is 10 μm；At 1250 DEG C, 2～
Under the conditions of 5h, CMAS depth of penetration is less than 15 μm.
The ceramic top layer porosity prepared according to the inventive method is less than 10%, and the bond strength of thermal barrier coating is more than
35MPa；Under the conditions of 1100 DEG C, the internal cold air flow 3m of hollow circular tube sample3Under/h, through test, pipe sample heat
The effect of heat insulation of barrier coating reached more than 165 DEG C (and tradition 8YSZ coating under same thickness and test condition, through experiment
Recording effect of heat insulation is 145～155 DEG C)；50mg/cm is smeared in 8YSZ coating and 8YSZ/48YSZ coating surface2CMAS sink
Long-pending thing powder, at 1200 DEG C, after 24h high-temperature heat treatment, 48YSZ coating CMAS depth of penetration is less than 25 μm；At 1250 DEG C, 2
～under 5h heat treatment, CMAS depth of penetration is less than 20 μm (as shown in Figure 1, Figure 2)；Through experiment record, tradition 8YSZ coating at 1200 DEG C,
After 24h high-temperature heat treatment, CMAS depth of penetration reaches more than 200 μm, and at 1250 DEG C, under the conditions of 2～5h, tradition 8YSZ coating is sent out
Give birth to substantially dissolution phenomena (seriously dissolving more than the 8YSZ coating of 50 μm) (such as Fig. 3, Fig. 4) in CMAS.
Certainly, the present invention also can have other various embodiments, in the case of without departing substantially from present invention spirit and essence thereof, ripe
Know those skilled in the art and can make various corresponding change and deformation according to the present invention, but these change and deformation accordingly
All should belong to the protection domain of the claims in the present invention.
Claims (9)
1. the thermal barrier coating that an anti-CMAS smelt deposits corrodes, it is characterised in that this thermal barrier coating includes:
The tack coat being made up of MCrAlY, the ceramic bottom being made up of 8YSZ, and the pottery top being made up of 18YSZ or 48YSZ
Layer, the gross thickness of this thermal barrier coating be less than 500 μm, and this ceramic top layer and this ceramic bottom layer thickness ratio is for 1:1～0.05:1；Its
Middle M is Ni or NiCo.
The thermal barrier coating that anti-CMAS smelt deposits the most according to claim 1 corrodes, it is characterised in that described tack coat
Thickness is 90～110 μm.
3. the preparation method of the thermal barrier coating that the anti-CMAS smelt deposits described in claim 1 or 2 corrodes, it is characterised in that
Comprise the steps:
Step one: will prepare the MCrAlY powder of tack coat, prepares 8YSZ powder and 18YSZ or the 48YSZ powder of ceramic layer
End, dries in an oven；
Step 2: spraying sample pre-treatment；
Step 3: the preparation of tack coat, uses HVAF mode to spray MCrAlY tack coat；
Step 4: using plasma spraying mode to spray 8YSZ pottery bottom, spraying parameter is: plasma spraying power 40
～60kW, powder feeding rate 20～40g/min, spray distance 70～110mm；And
Step 5: use plasma spraying mode in 8YSZ pottery bottom surface spraying 18YSZ or 48YSZ ceramic top layer, spraying
Technological parameter is: plasma spraying power 45～60kW, powder feeding rate 20～40g/min, spray distance 70～110mm；
Wherein, the gross thickness of thermal barrier coating is than for 1:1～0.05:1, M less than 500 μm, ceramic top layer and ceramic bottom layer thickness
For Ni or NiCo.
The preparation method of the thermal barrier coating that anti-CMAS smelt deposits the most according to claim 3 corrodes, it is characterised in that
The spraying coating process of described MCrAlY tack coat is oxygen flow 38～40L/h, kerosene oil flow 18～22L/h, powder sending quantity 45～
55g/min, spray distance 200～300mm, coating thickness 90～110 μm.
5. the preparation method of the thermal barrier coating corroded according to the anti-CMAS smelt deposits described in claim 3 or 4, its feature exists
60～120min are dried under the conditions of, described powder in an oven 90～110 DEG C.
6. the preparation method of the thermal barrier coating corroded according to the anti-CMAS smelt deposits described in claim 3 or 4, its feature exists
In, described step 2, for be carried out by sample acetone to be sprayed, to remove specimen surface greasy dirt, then carries out at sandblasting
Reason, finally carries out air blowing treatment with air gun, to remove specimen surface residual sand grains.
The preparation method of the thermal barrier coating that anti-CMAS smelt deposits the most according to claim 6 corrodes, it is characterised in that
Described sand blasting process condition is pressure 0.1～0.3MPa, sandblasting distance 60～80mm, sandblasting angle 70～80 °, sand used
It is 20～60 mesh emergies.
The preparation method of the thermal barrier coating that anti-CMAS smelt deposits the most according to claim 6 corrodes, it is characterised in that
Described air blowing treatment, for using air gun, is carried out under 0.3～0.5MPa pressure.
9. the preparation method of the thermal barrier coating corroded according to the anti-CMAS smelt deposits described in claim 3 or 4, its feature exists
In, described plasma spray is painted with normal atmospheric plasma spraying or high energy plasma spraying.
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