Improvement of Mechanical Properties of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub>–ZrO<sub>2</sub>–SiO<sub>2</sub> Amorphous Coatings by Surface Crystallization
Ceramic Al<sub>2</sub>O<sub>3</sub>−ZrO<sub>2</sub>−SiO<sub>2</sub> coatings with near eutectic composition were plasma sprayed using hybrid water stabilized plasma torch (WSP-H). The as-sprayed coatings possessed fully amorphous mi...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2019-10-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/12/19/3232 |
| id |
doaj-529726e16e704f2a91abdd35c55e3394 |
|---|---|
| record_format |
Article |
| spelling |
doaj-529726e16e704f2a91abdd35c55e33942020-11-25T01:15:08ZengMDPI AGMaterials1996-19442019-10-011219323210.3390/ma12193232ma12193232Improvement of Mechanical Properties of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub>–ZrO<sub>2</sub>–SiO<sub>2</sub> Amorphous Coatings by Surface CrystallizationJan Medricky0Frantisek Lukac1Stefan Csaki2Sarka Houdkova3Maria Barbosa4Tomas Tesar5Jan Cizek6Radek Musalek7Ondrej Kovarik8Tomas Chraska9Institute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, Prague 182 00, The Czech RepublicInstitute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, Prague 182 00, The Czech RepublicInstitute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, Prague 182 00, The Czech RepublicResearch and Testing Institute Pilzen, Pilsen 301 00, The Czech RepublicFraunhofer IWS, 01277 Dresden, GermanyInstitute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, Prague 182 00, The Czech RepublicInstitute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, Prague 182 00, The Czech RepublicInstitute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, Prague 182 00, The Czech RepublicDepartment of Materials, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague 115 19, The Czech RepublicInstitute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, Prague 182 00, The Czech RepublicCeramic Al<sub>2</sub>O<sub>3</sub>−ZrO<sub>2</sub>−SiO<sub>2</sub> coatings with near eutectic composition were plasma sprayed using hybrid water stabilized plasma torch (WSP-H). The as-sprayed coatings possessed fully amorphous microstructure which can be transformed to nanocrystalline by further heat treatment. The amorphous/crystalline content ratio and the crystallite sizes can be controlled by a specific choice of heat treatment conditions, subsequently leading to significant changes in the microstructure and mechanical properties of the coatings, such as hardness or wear resistance. In this study, two advanced methods of surface heat treatment were realized by plasma jet or by high energy laser heating. As opposed to the traditional furnace treatments, inducing homogeneous changes throughout the material, both approaches lead to a formation of gradient microstructure within the coatings; from dominantly amorphous at the substrate−coating interface vicinity to fully nanocrystalline near its surface. The processes can also be applied for large-scale applications and do not induce detrimental changes to the underlying substrate materials. The respective mechanical response was evaluated by measuring coating hardness profile and wear resistance. For some of the heat treatment conditions, an increase in the coating microhardness by factor up to 1.8 was observed, as well as improvement of wear resistance behaviour up to 6.5 times. The phase composition changes were analysed by X-ray diffraction and the microstructure was investigated by scanning electron microscopy.https://www.mdpi.com/1996-1944/12/19/3232amorphousnanocrystallinewear resistantvickers microhardnessplasma spraying |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Jan Medricky Frantisek Lukac Stefan Csaki Sarka Houdkova Maria Barbosa Tomas Tesar Jan Cizek Radek Musalek Ondrej Kovarik Tomas Chraska |
| spellingShingle |
Jan Medricky Frantisek Lukac Stefan Csaki Sarka Houdkova Maria Barbosa Tomas Tesar Jan Cizek Radek Musalek Ondrej Kovarik Tomas Chraska Improvement of Mechanical Properties of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub>–ZrO<sub>2</sub>–SiO<sub>2</sub> Amorphous Coatings by Surface Crystallization Materials amorphous nanocrystalline wear resistant vickers microhardness plasma spraying |
| author_facet |
Jan Medricky Frantisek Lukac Stefan Csaki Sarka Houdkova Maria Barbosa Tomas Tesar Jan Cizek Radek Musalek Ondrej Kovarik Tomas Chraska |
| author_sort |
Jan Medricky |
| title |
Improvement of Mechanical Properties of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub>–ZrO<sub>2</sub>–SiO<sub>2</sub> Amorphous Coatings by Surface Crystallization |
| title_short |
Improvement of Mechanical Properties of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub>–ZrO<sub>2</sub>–SiO<sub>2</sub> Amorphous Coatings by Surface Crystallization |
| title_full |
Improvement of Mechanical Properties of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub>–ZrO<sub>2</sub>–SiO<sub>2</sub> Amorphous Coatings by Surface Crystallization |
| title_fullStr |
Improvement of Mechanical Properties of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub>–ZrO<sub>2</sub>–SiO<sub>2</sub> Amorphous Coatings by Surface Crystallization |
| title_full_unstemmed |
Improvement of Mechanical Properties of Plasma Sprayed Al<sub>2</sub>O<sub>3</sub>–ZrO<sub>2</sub>–SiO<sub>2</sub> Amorphous Coatings by Surface Crystallization |
| title_sort |
improvement of mechanical properties of plasma sprayed al<sub>2</sub>o<sub>3</sub>–zro<sub>2</sub>–sio<sub>2</sub> amorphous coatings by surface crystallization |
| publisher |
MDPI AG |
| series |
Materials |
| issn |
1996-1944 |
| publishDate |
2019-10-01 |
| description |
Ceramic Al<sub>2</sub>O<sub>3</sub>−ZrO<sub>2</sub>−SiO<sub>2</sub> coatings with near eutectic composition were plasma sprayed using hybrid water stabilized plasma torch (WSP-H). The as-sprayed coatings possessed fully amorphous microstructure which can be transformed to nanocrystalline by further heat treatment. The amorphous/crystalline content ratio and the crystallite sizes can be controlled by a specific choice of heat treatment conditions, subsequently leading to significant changes in the microstructure and mechanical properties of the coatings, such as hardness or wear resistance. In this study, two advanced methods of surface heat treatment were realized by plasma jet or by high energy laser heating. As opposed to the traditional furnace treatments, inducing homogeneous changes throughout the material, both approaches lead to a formation of gradient microstructure within the coatings; from dominantly amorphous at the substrate−coating interface vicinity to fully nanocrystalline near its surface. The processes can also be applied for large-scale applications and do not induce detrimental changes to the underlying substrate materials. The respective mechanical response was evaluated by measuring coating hardness profile and wear resistance. For some of the heat treatment conditions, an increase in the coating microhardness by factor up to 1.8 was observed, as well as improvement of wear resistance behaviour up to 6.5 times. The phase composition changes were analysed by X-ray diffraction and the microstructure was investigated by scanning electron microscopy. |
| topic |
amorphous nanocrystalline wear resistant vickers microhardness plasma spraying |
| url |
https://www.mdpi.com/1996-1944/12/19/3232 |
| work_keys_str_mv |
AT janmedricky improvementofmechanicalpropertiesofplasmasprayedalsub2subosub3subzrosub2subsiosub2subamorphouscoatingsbysurfacecrystallization AT frantiseklukac improvementofmechanicalpropertiesofplasmasprayedalsub2subosub3subzrosub2subsiosub2subamorphouscoatingsbysurfacecrystallization AT stefancsaki improvementofmechanicalpropertiesofplasmasprayedalsub2subosub3subzrosub2subsiosub2subamorphouscoatingsbysurfacecrystallization AT sarkahoudkova improvementofmechanicalpropertiesofplasmasprayedalsub2subosub3subzrosub2subsiosub2subamorphouscoatingsbysurfacecrystallization AT mariabarbosa improvementofmechanicalpropertiesofplasmasprayedalsub2subosub3subzrosub2subsiosub2subamorphouscoatingsbysurfacecrystallization AT tomastesar improvementofmechanicalpropertiesofplasmasprayedalsub2subosub3subzrosub2subsiosub2subamorphouscoatingsbysurfacecrystallization AT jancizek improvementofmechanicalpropertiesofplasmasprayedalsub2subosub3subzrosub2subsiosub2subamorphouscoatingsbysurfacecrystallization AT radekmusalek improvementofmechanicalpropertiesofplasmasprayedalsub2subosub3subzrosub2subsiosub2subamorphouscoatingsbysurfacecrystallization AT ondrejkovarik improvementofmechanicalpropertiesofplasmasprayedalsub2subosub3subzrosub2subsiosub2subamorphouscoatingsbysurfacecrystallization AT tomaschraska improvementofmechanicalpropertiesofplasmasprayedalsub2subosub3subzrosub2subsiosub2subamorphouscoatingsbysurfacecrystallization |
| _version_ |
1725154325940928512 |