Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
NANOSTRUCTURED TIO2-CR2O3 THERMAL SPRAYED COATINGS
Thermal sprayed ceramic coatings are successfully employed to enhance the load carrying capacity and the tribological performance of the base material in order to extend the in-service life of equipment, including metal-seated ball valves (MSBV's) in Hydrometallurgy service. Ceramic coatings are vital to protect machines in the harsh abrasive conditions encountered in corrosive processes such as Pressure Oxidation (POx) and High Pressure Acid Leach (HPAL). Velan, a leading designer and manufacturer of industrial valves, has 20 years of experience in the engineering of severe service MSBV's for critical isolation applications around the autoclave. The National Research Council of Canada (NRC) in Boucherville and Polytechnique Montreal have world recognized know-how on coating engineering and characterization, in particular for wear. A detailed characterization project was undertaken by Velan in collaboration with the NRC and Polytechnique Montreal to perform mechanical and tribological resistance evaluation of the most promising ceramic coatings potentially suitable for this service, including a novel blend of n-Ti02-Cr2O3. Hardness and shear strength were evaluated using micro-hardness indentation testers and universal tensile testing equipment. Wear resistance of the coatings under different conditions such as sliding wear, abrasion and galling were measured by standard pin-on-disc tests, abrasion tests and custom-design galling tests. It was found that TiO2-Cr2O3 offers superior tribological performances compared to n-TiO2, mainly due to the presence of Cr2O3. Optimized balance between the hard and brittle Cr2O3 phases and the soft and ductile TiO2 phases yields to higher abrasion, sliding and galling resistance. In parallel, the novel mix of n-TiO, and Cr2O3 is considered as a promising evolution of the current TiO2-Cr2O3 blend.
NANOSTRUCTURED TIO2-CR2O3 THERMAL SPRAYED COATINGS
Thermal sprayed ceramic coatings are successfully employed to enhance the load carrying capacity and the tribological performance of the base material in order to extend the in-service life of equipment, including metal-seated ball valves (MSBV's) in Hydrometallurgy service. Ceramic coatings are vital to protect machines in the harsh abrasive conditions encountered in corrosive processes such as Pressure Oxidation (POx) and High Pressure Acid Leach (HPAL). Velan, a leading designer and manufacturer of industrial valves, has 20 years of experience in the engineering of severe service MSBV's for critical isolation applications around the autoclave. The National Research Council of Canada (NRC) in Boucherville and Polytechnique Montreal have world recognized know-how on coating engineering and characterization, in particular for wear. A detailed characterization project was undertaken by Velan in collaboration with the NRC and Polytechnique Montreal to perform mechanical and tribological resistance evaluation of the most promising ceramic coatings potentially suitable for this service, including a novel blend of n-Ti02-Cr2O3. Hardness and shear strength were evaluated using micro-hardness indentation testers and universal tensile testing equipment. Wear resistance of the coatings under different conditions such as sliding wear, abrasion and galling were measured by standard pin-on-disc tests, abrasion tests and custom-design galling tests. It was found that TiO2-Cr2O3 offers superior tribological performances compared to n-TiO2, mainly due to the presence of Cr2O3. Optimized balance between the hard and brittle Cr2O3 phases and the soft and ductile TiO2 phases yields to higher abrasion, sliding and galling resistance. In parallel, the novel mix of n-TiO, and Cr2O3 is considered as a promising evolution of the current TiO2-Cr2O3 blend.
NANOSTRUCTURED TIO2-CR2O3 THERMAL SPRAYED COATINGS
REVETEMENTS NANOSTRUCTURES DE TI02-CR2O3 PULVERISES PAR TRAITEMENT THERMIQUE
12.11.2015
Patent
Elektronische Ressource
Englisch
IPC:
B28B
Formgeben von Ton oder anderen keramischen Stoffzusammensetzungen, Schlacke oder von Mischungen, die zementartiges Material enthalten, z.B. Putzmörtel
,
SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
/
C01G
Verbindungen der von den Unterklassen C01D oder C01F nicht umfassten Metalle
,
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
/
C04B
Kalk
,
LIME
/
C23C
Beschichten metallischer Werkstoffe
,
COATING METALLIC MATERIAL
Tribological behavior of plasma sprayed Cr2O3-3%TiO2 coatings
| British Library Online Contents | 2011
| Europäisches Patentamt | 2021
| Europäisches Patentamt | 2015
| Europäisches Patentamt | 2019
| Europäisches Patentamt | 2025