Residual chlorine prevents full densification of flash sintered yttria-stabilized zirconia ceramics
The densification of yttria-stabilized zirconia (YSZ) during flash sintering is strongly dependent on the amount of residual chlorine in the sintered bodies. The residual chlorine, present as a remnant from powder synthesis, hinders densification after it is trapped and vaporized in the rapidly clos...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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Elsevier
2024
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| _version_ | 1811139395971973120 |
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| author | Prajzler, V Maca, K Todd, R |
| author_facet | Prajzler, V Maca, K Todd, R |
| author_sort | Prajzler, V |
| collection | OXFORD |
| description | The densification of yttria-stabilized zirconia (YSZ) during flash sintering is strongly dependent on the amount of residual chlorine in the sintered bodies. The residual chlorine, present as a remnant from powder synthesis, hinders densification after it is trapped and vaporized in the rapidly closing pores, limiting the final density at around 87 – 93% of theoretical. We show that this phenomenon is likely to affect all YSZ powders synthesized from chloride precursors unless the residual chlorine is reduced to ≤ 0.03 wt% before the onset of the flash sintering. This can be universally achieved by thermal purification of green bodies at a high temperature or by chemical purification in ammonium hydroxide. Furthermore, added binder in commercially available Tosoh zirconia TZ-powders (TZ-3YB, TZ-3YB-E) helps to significantly reduce chlorine content during binder burnout which in turn allows flash sintering into a high density even without green body purification. |
| first_indexed | 2024-09-25T04:05:25Z |
| format | Journal article |
| id | oxford-uuid:8c3eca90-3097-415f-b664-4f6a757b34fe |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-09-25T04:05:25Z |
| publishDate | 2024 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:8c3eca90-3097-415f-b664-4f6a757b34fe2024-05-29T09:51:40ZResidual chlorine prevents full densification of flash sintered yttria-stabilized zirconia ceramicsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:8c3eca90-3097-415f-b664-4f6a757b34feEnglishSymplectic ElementsElsevier2024Prajzler, VMaca, KTodd, RThe densification of yttria-stabilized zirconia (YSZ) during flash sintering is strongly dependent on the amount of residual chlorine in the sintered bodies. The residual chlorine, present as a remnant from powder synthesis, hinders densification after it is trapped and vaporized in the rapidly closing pores, limiting the final density at around 87 – 93% of theoretical. We show that this phenomenon is likely to affect all YSZ powders synthesized from chloride precursors unless the residual chlorine is reduced to ≤ 0.03 wt% before the onset of the flash sintering. This can be universally achieved by thermal purification of green bodies at a high temperature or by chemical purification in ammonium hydroxide. Furthermore, added binder in commercially available Tosoh zirconia TZ-powders (TZ-3YB, TZ-3YB-E) helps to significantly reduce chlorine content during binder burnout which in turn allows flash sintering into a high density even without green body purification. |
| spellingShingle | Prajzler, V Maca, K Todd, R Residual chlorine prevents full densification of flash sintered yttria-stabilized zirconia ceramics |
| title | Residual chlorine prevents full densification of flash sintered yttria-stabilized zirconia ceramics |
| title_full | Residual chlorine prevents full densification of flash sintered yttria-stabilized zirconia ceramics |
| title_fullStr | Residual chlorine prevents full densification of flash sintered yttria-stabilized zirconia ceramics |
| title_full_unstemmed | Residual chlorine prevents full densification of flash sintered yttria-stabilized zirconia ceramics |
| title_short | Residual chlorine prevents full densification of flash sintered yttria-stabilized zirconia ceramics |
| title_sort | residual chlorine prevents full densification of flash sintered yttria stabilized zirconia ceramics |
| work_keys_str_mv | AT prajzlerv residualchlorinepreventsfulldensificationofflashsinteredyttriastabilizedzirconiaceramics AT macak residualchlorinepreventsfulldensificationofflashsinteredyttriastabilizedzirconiaceramics AT toddr residualchlorinepreventsfulldensificationofflashsinteredyttriastabilizedzirconiaceramics |