Název projektu:
Technology Profiles by Date Search back to results listProfile Detail Procedure for obtaining ceramic granulated feedstock with spherical shape and controlled porosity for thermal spraying applications
Popis:
A Spanish public research organization has developed a procedure for obtaining ceramic granulated powders that can be used as feedstock for thermal spraying. The main advantages are the possibility of obtaining spherical powders, with a particle size within the range of 5 to 150 µm, controlled porosity and using a compact equipment. This procedure is competitive compared with the traditional methods of powder granulation. A patent license agreement and collaboration are sought.
Požadavky na partnera:
The feedstock material for thermal spraying equipment must fulfil some morphologic and size particle requirements to avoid the injection systems get blocked, to get homogeneous material avoiding heterogeneous coating and achieving the melt point for a coating with the adequate particle cohesion.
Among the common methods to obtain the feedstock material, there is fushing and crushing, where a dense powder with angular shape is obtained. The spray drying is an efficient method to produce porous granules but it has some disadvantages as the big size of the equipment and problems with homogeneity of the granules.
Freeze-drying or freeze granulating have the disadvantages of a big size particle, freezing methods not enviromentally friendly and very high porosity.
The present invention consists on a procedure for obtaining granulated feedstock powders from ceramic powder suspensions spraying in a cold way and freeze drying. In this case, the ceramic granules obtained are porous and homogeneous, with spherical shape, controlled porosity and a variable composition, with just one ceramic component or a mixture of some components and with a particle size within the range of 5 to 150 µm. These materials have the suitable characteristic to be used as feedstock in thermal spray coating techniques and improve some of the disadvantages of the usual methods.
The procedure consist on the following steps:
-Stabilization by means of shaking the ceramic suspension
-Atomization of the ceramic suspension obtained, with drop size control and freezing of the atomized drops
-Sublimation of the freeze water inside the granule and later drying
-Granule selection depending on the grain size required for the application
Yields of 90% of the granules in the range of 5 to 150 um are obtained.
The ceramic porous granules obtained with this procedure are used as feedstock in thermal spray coating techniques as Flame spraying, Plasma spraying or High Velocity Oxy-Fuel (HVOF).
Innovative Aspects:
With the present technology it has been obtained a material for thermal spraying equipment that improve some of the advantages of the habitual procedures, obtaining:
- granules with an homogeneous composition
- spherical morphology
- components without segregation
- precise control of the granule size within 5-150 µm
- density and porosity control of the granule
- compact size of the equipment when compared to the spray drying techniques
All of this makes this procedure ideal for obtaining ceramic porous granules as feedstock for thermal spraying coating techniques in industrial applications that improve the properties and the lifetime of the substrate materials.
Degree of development: Development phase - Laboratory tested
Patents/Rights: Patent(s) applied for but not yet granted
Requested Cooperation: License Agreement, Joint further development
- Type of partner sought:
Ceramic Powders, Ceramic Coatings.
- Specific area of activity of the partner:
Manufacturers of ceramic powder, thermal spraying companies.
- Task to be performed by the partner sought:
development, manufacture and commercialization.
Among the common methods to obtain the feedstock material, there is fushing and crushing, where a dense powder with angular shape is obtained. The spray drying is an efficient method to produce porous granules but it has some disadvantages as the big size of the equipment and problems with homogeneity of the granules.
Freeze-drying or freeze granulating have the disadvantages of a big size particle, freezing methods not enviromentally friendly and very high porosity.
The present invention consists on a procedure for obtaining granulated feedstock powders from ceramic powder suspensions spraying in a cold way and freeze drying. In this case, the ceramic granules obtained are porous and homogeneous, with spherical shape, controlled porosity and a variable composition, with just one ceramic component or a mixture of some components and with a particle size within the range of 5 to 150 µm. These materials have the suitable characteristic to be used as feedstock in thermal spray coating techniques and improve some of the disadvantages of the usual methods.
The procedure consist on the following steps:
-Stabilization by means of shaking the ceramic suspension
-Atomization of the ceramic suspension obtained, with drop size control and freezing of the atomized drops
-Sublimation of the freeze water inside the granule and later drying
-Granule selection depending on the grain size required for the application
Yields of 90% of the granules in the range of 5 to 150 um are obtained.
The ceramic porous granules obtained with this procedure are used as feedstock in thermal spray coating techniques as Flame spraying, Plasma spraying or High Velocity Oxy-Fuel (HVOF).
Innovative Aspects:
With the present technology it has been obtained a material for thermal spraying equipment that improve some of the advantages of the habitual procedures, obtaining:
- granules with an homogeneous composition
- spherical morphology
- components without segregation
- precise control of the granule size within 5-150 µm
- density and porosity control of the granule
- compact size of the equipment when compared to the spray drying techniques
All of this makes this procedure ideal for obtaining ceramic porous granules as feedstock for thermal spraying coating techniques in industrial applications that improve the properties and the lifetime of the substrate materials.
Degree of development: Development phase - Laboratory tested
Patents/Rights: Patent(s) applied for but not yet granted
Requested Cooperation: License Agreement, Joint further development
- Type of partner sought:
Ceramic Powders, Ceramic Coatings.
- Specific area of activity of the partner:
Manufacturers of ceramic powder, thermal spraying companies.
- Task to be performed by the partner sought:
development, manufacture and commercialization.
Obchodní firma/fyzická osoba:
Technologické centrum AV ČR
Sídlo/Místo podnikání:
Technologické centrum AV ČR - projekt Enterprise Europe Network
Ve Struhách 27, 160 00 Praha 6
Ve Struhách 27, 160 00 Praha 6
Kontaktní osoba:
Ing. Jiří Janošec
Email:
Telefon:
234 006 156
