CN116239388A - Granulating method of thermal spraying zirconia powder - Google Patents
Granulating method of thermal spraying zirconia powder Download PDFInfo
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- CN116239388A CN116239388A CN202211673340.1A CN202211673340A CN116239388A CN 116239388 A CN116239388 A CN 116239388A CN 202211673340 A CN202211673340 A CN 202211673340A CN 116239388 A CN116239388 A CN 116239388A
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- powder
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- granulating
- zirconia powder
- zirconia
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- 239000000843 powder Substances 0.000 title claims abstract description 94
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000007751 thermal spraying Methods 0.000 title claims abstract description 18
- 238000005469 granulation Methods 0.000 claims abstract description 13
- 230000003179 granulation Effects 0.000 claims abstract description 13
- 229920000084 Gum arabic Polymers 0.000 claims abstract description 12
- 241000978776 Senegalia senegal Species 0.000 claims abstract description 12
- 235000010489 acacia gum Nutrition 0.000 claims abstract description 12
- 239000000205 acacia gum Substances 0.000 claims abstract description 12
- 239000007921 spray Substances 0.000 claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000007873 sieving Methods 0.000 claims description 9
- 238000000498 ball milling Methods 0.000 claims description 7
- 239000002270 dispersing agent Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 4
- 229920000058 polyacrylate Polymers 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 abstract description 4
- 239000011230 binding agent Substances 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract 1
- 238000005507 spraying Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62695—Granulation or pelletising
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62222—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic coatings
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Composite Materials (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention discloses a granulating method of thermal spraying zirconia powder, which adopts gum arabic as a binder, utilizes the characteristic of burning loss of an organic substance at high temperature, prepares the zirconia powder with good spherical shape, good fluidity and compactness through spray granulation and high-temperature sintering processes, and finally does not contain organic impurities in the finished powder so as to improve the preparation efficiency and quality of a coating.
Description
Technical Field
The invention discloses a granulating method of thermal spraying zirconia powder, which relates to the technical field of thermal spraying.
Background
Thermal spraying processes are commonly used in the field of surface engineering, and the application of the thermal spraying process is to use thermal spraying powder as a raw material, so that the thermal spraying powder is required to have higher fluidity.
The preparation process of the thermal spraying powder is generally as follows: firstly, sintering the granulated powder at high temperature; and then crushing and sieving the product sintered at high temperature to obtain the final powder. However, the thermal spraying powder prepared by the method is mostly irregularly shaped due to mechanical crushing, and has poor powder fluidity, so that the efficiency and quality of preparing the coating are affected; in order to improve the quality of the powder, the powder obtained by the preparation method needs to be subjected to plasma spheroidization to obtain compact and round spherical powder, however, the powder prepared by the method has higher cost.
Therefore, how to develop a thermal spraying powder with low cost and good fluidity becomes a problem to be solved urgently.
Disclosure of Invention
In view of the above, the present invention provides a granulating method for thermally spraying zirconia powder, so as to solve the problems in the background art.
The technical scheme provided by the invention is that the method for granulating the thermal spraying zirconia powder comprises the following steps:
1) Dissolving gum arabic powder in water to prepare 5-50% of gum arabic solution by mass;
2) Uniformly mixing zirconia powder with the gum arabic solution prepared in the step 1) to prepare 25-75% mass ratio slurry;
3) And (3) carrying out spray granulation on the slurry obtained in the step (2), wherein the granulation parameters are that the air inlet temperature is 150-350 ℃, and the air outlet temperature is 100-200 ℃, so as to obtain dry powder.
Preferably, the granulating method of the thermal spraying zirconia powder further comprises the following steps:
4) Placing the dried powder in the step 3) into a drying box, and drying for 0.5-4 h at 50-200 ℃ to obtain secondary dried powder;
5) Sieving the secondary dried powder in the step 4) to obtain 10-800 mesh powder.
Further preferably, the granulating method of the thermal spraying zirconia powder further comprises the following steps:
6) Placing the powder with the granularity of 10 meshes to 800 meshes in the step 5) into a high-temperature furnace, and sintering for 0.5h to 12h at the temperature of 600 ℃ to 2600 ℃ to obtain sintered powder;
7) And (3) sieving the sintered powder in the step (6) to obtain 20-800 mesh powder.
It is further preferred that before the spray granulation of step 3), a dispersant of 1% by weight of the slurry is added to the slurry, and deionized water of half by weight of the slurry is added thereto, and then the slurry is put into a star ball mill for ball milling.
Further preferably, the dispersant is ammonium polyacrylate.
Further preferably, the grinding balls in the star ball mill are zirconia balls, and the diameter of the zirconia balls is 5-10mm.
According to the granulating method of the thermal spraying zirconia powder, provided by the invention, the gum arabic is used as a binder, the characteristics of burning loss of organic matters at high temperature are utilized, and the zirconia powder with good spherical shape, good fluidity and compactness is prepared through spray granulation and high-temperature sintering processes, so that no organic impurities exist in the final finished powder, and the coating preparation efficiency and quality are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure of the invention as claimed.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are not intended to represent all embodiments consistent with the invention. Rather, they are merely examples of methods consistent with aspects of the invention as detailed in the accompanying claims.
In order to provide zirconia powder with good fluidity and high compactness, the embodiment provides a granulating method of thermally sprayed zirconia powder, which comprises the following steps:
1) Dissolving gum arabic powder in water to prepare 5-50% of gum arabic solution by mass;
2) Uniformly mixing zirconia powder with the gum arabic solution prepared in the step 1) to prepare 25-75% mass ratio slurry;
3) And (3) carrying out spray granulation on the slurry obtained in the step (2), wherein the granulation parameters are that the air inlet temperature is 150-350 ℃, and the air outlet temperature is 100-200 ℃, so as to obtain dry powder.
As an improvement of the technical scheme, the following granulating steps can be added on the basis of the granulating method:
4) Placing the dried powder in the step 3) into a drying box, and drying for 0.5-4 h at 50-200 ℃ to obtain secondary dried powder;
5) Sieving the secondary dried powder in the step 4) to obtain 10-800 mesh powder.
As a further improvement of the technical scheme, the following granulating steps can be added on the basis of the granulating method:
6) Placing the powder with the granularity of 10 meshes to 800 meshes in the step 5) into a high-temperature furnace, and sintering for 0.5h to 12h at the temperature of 600 ℃ to 2600 ℃ to obtain sintered powder;
7) And (3) sieving the sintered powder in the step (6) to obtain 20-800 mesh powder.
In the granulating method, powder is generated in the steps 3), 5) and 7), the powder in different steps can be selected as spraying powder according to different performance requirements of a final coating, for example, when a loose porous coating is required to be sprayed, the powder obtained in the step 5) can be selected, and as the powder is a hollow sphere, a uniform pore structure can be formed in the coating after spraying; the compact coating is required to be sprayed, and the powder obtained in the step 7) can be selected, and the compact coating can be formed after the powder is sprayed due to the fact that the powder is solid spherical.
The powder in the step 7) is screened for multiple times, so that irregular spheres formed by melting small particles in the final powder are greatly reduced, and pores and thermal stress in a coating formed after spraying are obviously improved.
In order to optimize the spray granulation effect, as an improvement of the technical scheme, before spray granulation in the step 3), adding a dispersing agent accounting for 1% of the weight of the slurry into the slurry, adding deionized water accounting for half of the weight of the slurry, and then putting into a star ball mill for ball milling, wherein the grinding balls in the star ball mill are zirconia balls, the diameter of the zirconia balls is 5-10mm, the adding quality of the zirconia balls is equal to the mass of the slurry, and the added dispersing agent is ammonium polyacrylate.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention will be further illustrated with reference to specific examples.
A granulating method of thermal spraying zirconia powder comprises the following specific granulating steps:
1) Preparing gum arabic powder and deionized water into a mass ratio of 1:2, placing the solution into a closed container, and magnetically stirring the solution in a water bath kettle with the water temperature of 60 ℃ for 2 hours;
2) Preparing zirconia powder with the particle size smaller than 5 microns and the solution prepared by 1) into a mass ratio of 2:1, adding ammonium polyacrylate accounting for 1 percent of the weight of the powder into the slurry as a dispersing agent, and adding deionized water accounting for half of the weight of the powder into the slurry to prepare the slurry;
3) Putting the slurry prepared in the step 2) and zirconia ball milling balls with the mass and the diameter of 5-10mm into a ball milling tank, and performing 2h ball milling by using a planetary ball mill and the parameter of 24 Hz;
4) Pumping the slurry obtained after ball milling in the step 3) into a spray drying tower with the air inlet temperature of 240+/-2 ℃ and the air outlet temperature of 102+/-2 ℃ for granulation;
5) Tiling the powder obtained in the step 4) to enable the thickness to be 4-5 cm, drying the powder in a baking oven at 120 ℃ for 2 hours, and keeping the powder in the baking oven at the temperature of not lower than 60 ℃ until sintering is carried out;
6) Sieving the powder obtained in the step 5) in a 200-mesh and 325-mesh screen, and continuously putting the obtained powder into an oven for storage;
7) Spreading the powder obtained in the step 6) into a flaring crucible, wherein the thickness of the powder is not more than 10 cm, heating the powder in a high-temperature furnace along with the furnace, heating the furnace to 1350 ℃, preserving heat for 4 hours, and cooling the powder along with the furnace to 200 ℃ to take out the powder;
8) And (3) sieving the powder obtained in the step 7) in a 200-mesh and 325-mesh screen to obtain the finished product powder.
The powder prepared by the embodiment is coated and sprayed, and is approved to be applied to a gas turbine of a ship, so that the performance requirement is met.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to what has been described above and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (6)
1. The granulating method of the thermal spraying zirconia powder is characterized by comprising the following steps of:
1) Dissolving gum arabic powder in water to prepare 5-50% of gum arabic solution by mass;
2) Uniformly mixing zirconia powder with the gum arabic solution prepared in the step 1) to prepare 25-75% mass ratio slurry;
3) And (3) carrying out spray granulation on the slurry obtained in the step (2), wherein the granulation parameters are that the air inlet temperature is 150-350 ℃, and the air outlet temperature is 100-200 ℃, so as to obtain dry powder.
2. The method for granulating a thermally sprayed zirconia powder as claimed in claim 1, further comprising the steps of:
4) Placing the dried powder in the step 3) into a drying box, and drying for 0.5-4 h at 50-200 ℃ to obtain secondary dried powder;
5) Sieving the secondary dried powder in the step 4) to obtain 10-800 mesh powder.
3. The method for granulating a thermally sprayed zirconia powder as claimed in claim 2, further comprising the steps of:
6) Placing the powder with the granularity of 10 meshes to 800 meshes in the step 5) into a high-temperature furnace, and sintering for 0.5h to 12h at the temperature of 600 ℃ to 2600 ℃ to obtain sintered powder;
7) And (3) sieving the sintered powder in the step (6) to obtain 20-800 mesh powder.
4. The method for granulating a thermally sprayed zirconia powder according to claim 1, wherein 1% by weight of the dispersant based on the weight of the slurry is added to the slurry before the spray granulation in step 3), and half by weight of deionized water based on the weight of the slurry is added to the slurry, and the slurry is put into a star ball mill for ball milling.
5. The method for granulating a thermally sprayed zirconia powder of claim 4 wherein the dispersant is ammonium polyacrylate.
6. The method for granulating a thermally sprayed zirconia powder as claimed in claim 4, wherein the grinding balls in the star ball mill are zirconia balls having a diameter of 5 to 10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211673340.1A CN116239388A (en) | 2022-12-26 | 2022-12-26 | Granulating method of thermal spraying zirconia powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211673340.1A CN116239388A (en) | 2022-12-26 | 2022-12-26 | Granulating method of thermal spraying zirconia powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116239388A true CN116239388A (en) | 2023-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211673340.1A Pending CN116239388A (en) | 2022-12-26 | 2022-12-26 | Granulating method of thermal spraying zirconia powder |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008024569A (en) * | 2006-07-25 | 2008-02-07 | Sumitomo Chemical Co Ltd | Method for producing zirconium oxide powder |
| CN102584224A (en) * | 2012-02-29 | 2012-07-18 | 重庆利特高新技术有限公司 | Preparation method of nanoscale zirconia ceramic powder for spraying |
| CN108546907A (en) * | 2018-04-16 | 2018-09-18 | 北京航空航天大学 | A kind of plasma physical vapor deposition yttria-stabilized zirconia doping lanthanum cerate material powder and its preparation method and application |
| DE102017005800A1 (en) * | 2017-06-21 | 2018-12-27 | H.C. Starck Surface Technology and Ceramic Powders GmbH | Zirconia powder for thermal spraying |
| CN109836152A (en) * | 2017-11-27 | 2019-06-04 | 山西朔神新材料科技有限公司 | A kind of preparation method of zirconia ceramics and the zirconia ceramics prepared according to this method |
| CN111777413A (en) * | 2020-07-16 | 2020-10-16 | 哈尔滨工业大学 | Preparation method and application of nano gadolinium zirconate powder for plasma spraying |
-
2022
- 2022-12-26 CN CN202211673340.1A patent/CN116239388A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008024569A (en) * | 2006-07-25 | 2008-02-07 | Sumitomo Chemical Co Ltd | Method for producing zirconium oxide powder |
| CN102584224A (en) * | 2012-02-29 | 2012-07-18 | 重庆利特高新技术有限公司 | Preparation method of nanoscale zirconia ceramic powder for spraying |
| DE102017005800A1 (en) * | 2017-06-21 | 2018-12-27 | H.C. Starck Surface Technology and Ceramic Powders GmbH | Zirconia powder for thermal spraying |
| CN109836152A (en) * | 2017-11-27 | 2019-06-04 | 山西朔神新材料科技有限公司 | A kind of preparation method of zirconia ceramics and the zirconia ceramics prepared according to this method |
| CN108546907A (en) * | 2018-04-16 | 2018-09-18 | 北京航空航天大学 | A kind of plasma physical vapor deposition yttria-stabilized zirconia doping lanthanum cerate material powder and its preparation method and application |
| CN111777413A (en) * | 2020-07-16 | 2020-10-16 | 哈尔滨工业大学 | Preparation method and application of nano gadolinium zirconate powder for plasma spraying |
Non-Patent Citations (1)
| Title |
|---|
| 程汉池, 栗卓新, 汤春天: "喷雾造粒在热喷涂中的应用研究", 中国化工装备, no. 04, pages 18 - 23 * |
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