CN111979510B - Method for separating thermal barrier coating waste powder containing ceramic layer and bonding layer powder - Google Patents
Method for separating thermal barrier coating waste powder containing ceramic layer and bonding layer powder 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
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- 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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- 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
- C23C4/073—Metallic material containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-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
- C23C4/11—Oxides
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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
- C23C4/129—Flame spraying
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Abstract
The invention discloses a method for separating thermal barrier coating waste powder containing ceramic layer and bonding layer powder, which comprises the steps of firstly screening the thermal barrier coating waste powder collected from a spraying chamber into five sections of powder particles with different particle size distributions by automatic vibrating screens with different meshes, and removing the powder particles with the largest and smallest particle sizes; and then separating bonding layer powder and ceramic layer powder from the rest waste powder by using an air separation technology according to the larger density difference of different powders. The purity of the bonding layer powder separated and recovered by the method is more than 96%, the purity of the ceramic layer powder is more than 98%, the bonding layer powder and the ceramic layer powder can be reused, the whole treatment process is realized on one production line, the whole process is operated in a fully-closed mode, and no pollution is produced in the production process.
Description
Technical Field
The invention belongs to the technical field of coating powder separation, and particularly relates to a method for separating thermal barrier coating waste powder containing ceramic layer and bonding layer powder.
Background
The thermal barrier coating is the most effective means for improving the use temperature of hot-end components of advanced aeroengines and gas turbines, is one of the indispensable key technologies of the advanced gas turbines, and the thermal barrier coating material which is most widely applied to the gas turbines at present is 8YSZ (6-8% Y) 2 O 3 Partially stabilized ZrO 2 ) As a ceramic layer and MCrAlY (M ═ Ni or Co or Ni + Co) as a bond coat. The existing thermal barrier coating is usually prepared by plasma spraying, electron beam physical vapor deposition, supersonic flame spraying and other technologies.
With the continuous development of the aviation market and the gas turbine market, people pay attention to the waste problem of the sprayed powder in the preparation process of the thermal barrier coating. The common plasma spraying of the ceramic layer and the bonding layer is that the ceramic layer powder and the bonding layer powder are carried by gas and sprayed into plasma flame to be rapidly melted and accelerated, the molten ceramic layer and the bonding layer material liquid drop are violently collided and spread on the high-temperature alloy substrate to be solidified to form a sheet layer, and the sheet layer is continuously accumulated to finally form a coating. During the coating deposition process, part of the bonding layer material can be oxidized to generate various oxides, and part of the bonding layer material and the ceramic layer material cannot be deposited on the workpiece. Whether plasma spraying or electron beam physical vapor deposition is adopted, the deposition efficiency of the coating is between 40 and 70 percent, and powder which is not deposited on the substrate is pumped by an exhaust fan and finally treated by waste powder. If the waste powder of the thermal barrier coating is not recycled, the preparation cost of the thermal barrier coating is increased, the waste of raw materials is greatly caused, and the problem of environmental protection is caused.
At present, the recycling of waste powder and the environmental protection problem begin to attract people's attention, for example, patent ZL201520585546.8 proposes a thermal spraying powder collecting and recycling device, but the device only relates to powder recycling, and does not separate and recycle powder; patent ZL201621192215.9 proposes a recycling device for residual thermal spraying powder, which does not recycle waste powder; for example, patent 201810190688.2 proposes a polar magnetic separation technique to separate ceramic layer and adhesive layer powders from thermal barrier coating waste powders, but this method can separate different powders from waste powders, but the waste powders have many different kinds of powders, and the difference in magnetism of some powders is not very significant, and complete separation of powders cannot be achieved, and the purity of the separated single powder is not high.
Therefore, the method for separating the ceramic layer powder and the bonding layer powder from the thermal barrier coating waste powder is researched, the preparation cost can be reduced, and the method is environment-friendly and has remarkable economic value.
Disclosure of Invention
The invention provides a method for separating waste thermal barrier coating powder containing ceramic layer and bonding layer powder aiming at the problems in the prior art, and particularly relates to a method for separating powder by using an air separation technology according to the principle that different powders have different densities.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for separating waste powder of thermal barrier coating containing ceramic layer and bonding layer powder comprises the following steps:
step (1): collecting waste thermal barrier coating powder in the spraying chamber;
step (2): screening the waste thermal barrier coating powder by using a screen of 200-1000 meshes and an automatic vibrating screen and grading;
and (3): and finally, adopting an air separation technology to separate the waste powder after screening and grading by sections through an air separator, and separating and recycling the bonding layer powder and the ceramic layer powder.
The invention is further improved in that the thermal barrier coating waste powder in the spraying chamber of the atmospheric plasma spraying equipment or the supersonic flame spraying and atmospheric plasma spraying integrated equipment in the step (1) comprises bonding layer powder, ceramic layer powder, bonding layer melting agglomerated particles, ceramic layer melting agglomerated particles with different sizes and different grain diameters, and small particles formed by splashing of oxidized bonding layer powder and melting particles.
The further improvement of the invention is that the thermal barrier coating waste powder collected in the step (1) is screened by an automatic vibrating screen in the step (2), four layers of nets are arranged in the vibrating screen, the meshes are respectively 200 meshes, 400 meshes, 600 meshes and 1000 meshes, and the thermal barrier coating waste powder is divided into five sections, namely, the sections are below 200 meshes, 200 meshes to 400 meshes, 400 meshes to 600 meshes, 600 meshes to 1000 meshes and more than 1000 meshes.
The further improvement of the invention is that the content of bonding layer powder and ceramic layer powder in the sieved powder below 200 meshes is less than 5 percent, and the bonding layer powder and the ceramic layer powder are mainly fused agglomerated particles; the powder with more than 1000 meshes contains bonding layer powder less than 1%, and is mainly small particles formed by splashing molten particles.
The invention has the further improvement that the mixed powder of 200-400 meshes sieved in the step (2) mainly comprises bonding layer powder and ceramic layer powder; the mixed powder of 400-1000 meshes mainly comprises bonding layer powder and oxidized bonding layer powder.
The further improvement of the invention is that the sieved powder below 200 meshes and above 1000 meshes is not further separated; the mixed powder of 200-400 meshes, 400-600 meshes and 600-1000 meshes is filled into three independent air separation cylinders for further separation treatment.
The invention has the further improvement that the specific process of the step (3) is as follows:
301) according to F-6 pi mu 0 And a Vd formula, drawing a critical curve of the flow Q and the powder particle diameter d of the mixture of the bonding layer powder and the ceramic layer powder with 200 meshes-1000 meshes, wherein the flow F is just equal to the gravity P, namely F-P is equal to 0, and obtaining critical point air volumes of the bonding layer powder with 200 meshes, 400 meshes and 600 meshes of 0.37-0.48 m respectively from the critical curve 3 /s、0.31～0.44m 3 /s、0.28～0.42m 3 S; the critical point air volume of the ceramic layer powder of 200 meshes, 400 meshes and 600 meshes is 0.15-0.36 m 3 /s、0.05～0.14m 3 /s、0.02～0.10m 3 /s；
302) Adopting air separation technology, leading air quantity into each air separation cylinder by a fan, and adjusting the air quantity by an adjusting plate and a butterfly valve;
303) introducing 0.15-0.36 m Q into an air separation cylinder filled with 200-400 mesh mixed powder 3 Blowing away ceramic layer powder with a particle size finer than that of the ceramic layer powder corresponding to 200 meshes by the air quantity/s, collecting the ceramic layer powder in a separator, naturally dropping bonding layer powder, and collecting the bonding layer powder in a discharge cylinder;
304) introducing 0.31-0.44 m Q into an air separation cylinder filled with 400-600 mesh mixed powder 3 Blowing away bonding layer powder with a particle size smaller than that of the bonding layer powder with a particle size corresponding to 400 meshes by the air quantity/s, allowing the bonding layer powder to enter a separator for collection, and allowing oxidized bonding layer powder to naturally fall down and enter a discharge cylinder for collection;
305) introducing Q0.28-0.42 m into an air separation cylinder filled with 600-1000 mesh mixed powder by the same method 3 The air quantity per second blows bonding layer powder with a particle size smaller than that of 600 meshes away, the bonding layer powder enters a separator and is collected, and oxidized bonding layer powder naturally falls down and enters a discharge barrel and is collected.
The invention has the further improvement that the bonding layer powder obtained by the method accounts for 28-64% of the total amount of the waste powder, and the ceramic layer powder accounts for 32-71% of the total amount of the waste powder; the purity of the bonding layer powder separated and recovered is more than 96%, the purity of the ceramic layer powder is more than 98%, and the powder can be reused.
Compared with the prior art, the method for separating the waste thermal barrier coating powder containing the ceramic layer and the bonding layer powder has the following beneficial technical effects:
1) the whole treatment process is realized on one production line, the operation is totally closed, and no pollution is produced in the production;
2) the purity of the bonding layer powder separated and recovered is more than 96%, and the purity of the ceramic layer powder is more than 98%, so that the two kinds of powder can be reused.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The thermal barrier coating is prepared by adopting atmospheric plasma spraying equipment, wherein the bonding layer adopts NiCoCrAlTaY metal powder, the particle size of the powder is 5-38 mu m, and the ceramic layer adopts 8YSZ powder, the particle size of the powder is 45-75 mu m. The waste powder in the spraying chamber after spraying mainly comprises bonding layer powder, ceramic layer powder, bonding layer fusion agglomerated particles, ceramic layer fusion agglomerated particles with different particle sizes, small particles formed by splashing of oxidized bonding layer powder and fusion particles and the like, and the total weight of the collected waste powder is 10 kilograms.
Screening the thermal barrier coating waste powder by an automatic vibrating screen, wherein the vibrating screen is provided with four layers of screens, the meshes are respectively 200 meshes, 400 meshes, 600 meshes and 1000 meshes, and the thermal barrier coating waste powder is divided into five sections, namely, the sections are below 200 meshes, 200 meshes to 400 meshes, 400 meshes to 600 meshes, 600 meshes to 1000 meshes and more than 1000 meshes.
0.43 kg of powder with the particle size of below 200 meshes, which is mainly fused agglomerated particles of bonding layer powder and ceramic layer powder, wherein the content of the bonding layer powder and the ceramic layer powder is less than 4%; over 1000 mesh powder 0.95 kg, mainly small particles formed by molten particles splashing, wherein the bonding layer powder content is less than 5%. The powders below 200 mesh and above 1000 mesh were not further processed for separation.
The powder of 200 meshes to 400 meshes weighs 4.74 kg, the powder of 400 meshes to 600 meshes weighs 2.81 kg, and the powder of 600 meshes to 1000 meshes weighs 1.07 kg. The powder of 200-400 meshes, 400-600 meshes and 600-1000 meshes is loaded into three independent air separation cylinders, the air separation technology is adopted, the air quantity is introduced into each air separation cylinder by a fan, the air quantity is adjusted by an adjusting plate and a butterfly valve, and the powder is further separated and treated.
According to F-6 pi mu 0 Vd formula, drawing a critical curve of the flow Q and the powder particle diameter d of the 200-1000 mesh powder wind power F which is just equal to the gravity P, namely F-P is 0 curve, and obtaining critical point air volumes of 0.42m of the 200-mesh, 400-mesh and 600-mesh bonding layer powder respectively from the curve 3 /s、0.395m 3 /s、0.38m 3 S; the critical point air volume of the ceramic layer powder of 200 meshes, 400 meshes and 600 meshes is 0.15m 3 /s、0.09m 3 /s、0.07m 3 /s。
Introducing Q0.15 m into an air separation cylinder filled with 200-400 mesh mixed powder 3 The air quantity per second is that ceramic layer powder with a particle size finer than that of the ceramic layer powder corresponding to 200 meshes is blown away, enters a separator and is collected, and bonding layer powder naturally falls down and enters a discharge cylinder to be collected.
In an air separation cylinder filled with mixed powder of 400-600 meshes, Q is 0.395m 3 The air quantity per second is that bonding layer powder with the particle size smaller than that of the bonding layer powder corresponding to 400 meshes is blown away and enters a separator to be collected, and oxidized bonding layer powder naturally falls down and enters a discharge barrel to be collected.
By the same method, Q is 0.38m and is introduced into an air separation cylinder filled with 600-1000 mesh mixed powder 3 The air quantity per second is that bonding layer powder finer than the particle size corresponding to 600 meshes is blown away and enters a separator to be collected, and oxidized bonding layer powder naturally falls down and enters a discharge cylinder to be collected.
Finally, the recovered bond coat powder weighed 3.32 kg and the ceramic layer powder weighed 4.93 kg.
Example 2
The thermal barrier coating is prepared by adopting supersonic flame spraying and atmospheric plasma spraying integrated equipment, wherein the bonding layer is NiCoCrAlYHfSi metal powder, the particle size of the powder is 5-63 mu m, and the ceramic layer is 8YSZ powder, the particle size of the powder is 45-75 mu m. The waste powder in the spraying chamber after spraying mainly comprises bonding layer powder, ceramic layer powder, bonding layer fusion agglomerated particles, ceramic layer fusion agglomerated particles with different particle sizes, small particles formed by splashing of oxidized bonding layer powder and fusion particles and the like, and the total weight of the collected waste powder is 10 kilograms.
Screening the thermal barrier coating waste powder by an automatic vibrating screen, wherein the vibrating screen is provided with four layers of screens, the meshes are respectively 200 meshes, 400 meshes, 600 meshes and 1000 meshes, and the thermal barrier coating waste powder is divided into five sections, namely, the sections are below 200 meshes, 200 meshes to 400 meshes, 400 meshes to 600 meshes, 600 meshes to 1000 meshes and more than 1000 meshes.
0.41 kg of powder with the particle size of below 200 meshes, which is mainly fused agglomerated particles of bonding layer powder and ceramic layer powder, wherein the content of the bonding layer powder and the ceramic layer powder is less than 4%; over 1000 mesh powder 0.45 kg, mainly small particles formed by molten particles splashing, wherein the bonding layer powder content is less than 5%. The powders below 200 mesh and above 1000 mesh were not further processed for separation.
The powder of 200 meshes to 400 meshes weighs 5.35 kg, the powder of 400 meshes to 600 meshes weighs 2.81 kg, and the powder of 600 meshes to 1000 meshes weighs 0.98 kg. The mixed powder of 200-400 meshes, 400-600 meshes and 600-1000 meshes is loaded into three independent air separation cylinders, the air separation technology is adopted, the air quantity is introduced into each air separation cylinder by a fan, and the air quantity is adjusted by an adjusting plate and a butterfly valve, so that the powder is further separated.
According to F-6 pi mu 0 Vd formula, drawing a critical curve of flow (Q) and powder particle size (d) of 200-1000 mesh mixed powder with wind force (F) and gravity (P) being exactly equal, namely F-P being 0 curve, and obtaining critical point air volumes of 0.45m for 200-mesh, 400-mesh and 600-mesh bonding layer powder respectively from the curve 3 /s、0.435m 3 /s、0.405m 3 S; ceramic layer powder of 200 meshes, 400 meshes and 600 meshesCritical point air volume of 0.15m 3 /s、0.09m 3 /s、0.07m 3 /s。
Introducing Q0.15 m into an air separation cylinder filled with 200-400 mesh mixed powder 3 The air quantity per second is that ceramic layer powder with a particle size finer than that of the ceramic layer powder corresponding to 200 meshes is blown away, enters a separator and is collected, and bonding layer powder naturally falls down and enters a discharge cylinder to be collected.
Introducing Q0.435 m into an air separation cylinder filled with mixed powder of 400-600 meshes 3 The air quantity per second is that bonding layer powder with the particle size smaller than that of the bonding layer powder corresponding to 400 meshes is blown away and enters a separator to be collected, and oxidized bonding layer powder naturally falls down and enters a discharge barrel to be collected.
In the same way, Q is introduced into an air separation cylinder filled with 600-1000 mesh mixed powder, wherein Q is 0.405m 3 The air quantity per second is that bonding layer powder finer than the particle size corresponding to 600 meshes is blown away and enters a separator to be collected, and oxidized bonding layer powder naturally falls down and enters a discharge cylinder to be collected.
Finally, the recovered bond coat powder weighed 4.58 kg and the ceramic layer powder 5.44 kg.
Claims (6)
1. A method for separating waste powder of thermal barrier coating containing ceramic layer and bonding layer powder is characterized by comprising the following steps:
step (1): collecting waste thermal barrier coating powder in the spraying chamber; the waste powder of the thermal barrier coating in the spraying chamber of the atmospheric plasma spraying equipment or the supersonic flame spraying and atmospheric plasma spraying integrated equipment comprises bonding layer powder, ceramic layer powder, bonding layer fusion agglomerated particles and ceramic layer fusion agglomerated particles with different sizes and particle diameters, and small particles formed by splashing of oxidized bonding layer powder and fused particles;
step (2): screening the waste thermal barrier coating powder by using a screen of 200-1000 meshes and an automatic vibrating screen and grading;
and (3): and finally, adopting an air separation technology to separate the waste powder after screening and grading by sections through an air separator, and separating and recycling the bonding layer powder and the ceramic layer powder, wherein the specific process is as follows:
301) according to F-6 pi mu 0 And a Vd formula, drawing a critical curve of the flow Q and the powder particle diameter d of the mixture of the bonding layer powder and the ceramic layer powder with 200 meshes-1000 meshes, wherein the flow F is just equal to the gravity P, namely F-P is equal to 0, and obtaining critical point air volumes of the bonding layer powder with 200 meshes, 400 meshes and 600 meshes of 0.37-0.48 m respectively from the critical curve 3 /s、0.31～0.44m 3 /s、0.28～0.42m 3 S; the critical point air volume of the ceramic layer powder of 200 meshes, 400 meshes and 600 meshes is 0.15-0.36 m 3 /s、0.05～0.14m 3 /s、0.02～0.10m 3 /s；
302) Adopting air separation technology, leading air quantity into each air separation cylinder by a fan, and adjusting the air quantity by an adjusting plate and a butterfly valve;
303) introducing 0.15-0.36 m Q into an air separation cylinder filled with 200-400 mesh mixed powder 3 Blowing away ceramic layer powder with a particle size finer than that of the ceramic layer powder corresponding to 200 meshes by the air quantity/s, collecting the ceramic layer powder in a separator, naturally dropping bonding layer powder, and collecting the bonding layer powder in a discharge cylinder;
304) introducing 0.31-0.44 m Q into an air separation cylinder filled with 400-600 mesh mixed powder 3 Blowing away bonding layer powder with a particle size smaller than that of the bonding layer powder with a particle size corresponding to 400 meshes by the air quantity/s, allowing the bonding layer powder to enter a separator for collection, and allowing oxidized bonding layer powder to naturally fall down and enter a discharge cylinder for collection;
305) introducing Q0.28-0.42 m into an air separation cylinder filled with 600-1000 mesh mixed powder by the same method 3 The air quantity per second blows bonding layer powder with a particle size smaller than that of 600 meshes away, the bonding layer powder enters a separator and is collected, and oxidized bonding layer powder naturally falls down and enters a discharge barrel and is collected.
2. The method for separating the thermal barrier coating waste powder containing ceramic layer and bonding layer powder as claimed in claim 1, wherein the thermal barrier coating waste powder collected in step (1) is sieved by an automatic vibrating screen in step (2), the vibrating screen has four layers of meshes with meshes of 200 mesh, 400 mesh, 600 mesh and 1000 mesh, and the thermal barrier coating waste powder is divided into five sections, i.e. 200 mesh or less, 200 mesh to 400 mesh, 400 mesh to 600 mesh, 600 mesh to 1000 mesh and 1000 mesh or more.
3. The method for separating the thermal barrier coating waste powder containing ceramic layer and bonding layer powder as claimed in claim 2, wherein the bonding layer powder and ceramic layer powder content in the sieved powder below 200 mesh is less than 5%, and the screened powder is mainly the melting agglomerated particles of the bonding layer and ceramic layer powder; the powder with more than 1000 meshes contains bonding layer powder less than 1%, and is mainly small particles formed by splashing molten particles.
4. The method for separating the thermal barrier coating waste powder containing ceramic layer and bonding layer powder as claimed in claim 2, wherein the mixed powder of 200-400 mesh sieved in step (2) is mainly composed of bonding layer powder and ceramic layer powder; the mixed powder of 400-1000 meshes is mainly composed of bonding layer powder and oxidized bonding layer powder.
5. The method for separating the thermal barrier coating waste powder containing ceramic layer and bonding layer powder as claimed in claim 2, wherein the sieved powder below 200 mesh and above 1000 mesh is not further separated; the mixed powder of 200-400 meshes, 400-600 meshes and 600-1000 meshes is filled into three independent air separation cylinders for further separation treatment.
6. The method for separating the thermal barrier coating waste powder containing the ceramic layer and the bonding layer powder as claimed in any one of claims 1 to 5, wherein the bonding layer powder obtained by the method accounts for 28-64% of the total amount of the waste powder, and the ceramic layer powder accounts for 32-71% of the total amount of the waste powder; the purity of the bonding layer powder separated and recovered is more than 96%, the purity of the ceramic layer powder is more than 98%, and the powder can be reused.
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| DE3823924A1 (en) * | 1988-06-14 | 1989-12-21 | Erich Kraemer | METHOD AND DEVICE FOR RECOVERY OF EXCESSIVE POWDER FROM POWDER COATING CABINS |
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