Origin of unusual sintering phenomena in compacts of chloride-derived 3Y-TZP nanopowders
After evaluating three alternative possibilities, the present study shows that seemingly minor amounts (at least as low as 0.06 wt%) of chlorine impurities are responsible for the poor sintering behavior observed in chloride-derived 3 mol% yttria stabilized zirconia (3Y-TZP) nanopowders....
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
International Institute for the Science of Sintering, Beograd
2014-01-01
|
| Series: | Science of Sintering |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-820X/2014/0350-820X1402169S.pdf |
| _version_ | 1819161667523575808 |
|---|---|
| author | Sweeney Sean M. Mayo Merrilea J. |
| author_facet | Sweeney Sean M. Mayo Merrilea J. |
| author_sort | Sweeney Sean M. |
| collection | DOAJ |
| description | After evaluating three alternative possibilities, the present study shows
that seemingly minor amounts (at least as low as 0.06 wt%) of chlorine
impurities are responsible for the poor sintering behavior observed in
chloride-derived 3 mol% yttria stabilized zirconia (3Y-TZP) nanopowders.
Models and quantitative estimates are used to explain the role of evolved HCl
and ZrCl4 gases in such anomalous behaviors as reduced sintered densities for
higher green densities, de-densification, improved sintering in nitrogen over
oxygen, and formation of a dense shell microstructure. Two solutions to
problematic residual chlorides are compared: 1) a thermal treatment composed
of an extended hold at 1000°C to allow HCl gas removal before the onset of
closed porosity, and 2) a chemical treatment performed by washing
bisque-fired samples at room temperature using a concentrated ammonium
hydroxide solution to remove chlorides. The thermal treatment was found to be
superior. |
| first_indexed | 2024-12-22T17:15:59Z |
| format | Article |
| id | doaj.art-08092661b7fe47c6a93c5ec69d8cf55a |
| institution | Directory Open Access Journal |
| issn | 0350-820X 1820-7413 |
| language | English |
| last_indexed | 2024-12-22T17:15:59Z |
| publishDate | 2014-01-01 |
| publisher | International Institute for the Science of Sintering, Beograd |
| record_format | Article |
| series | Science of Sintering |
| spelling | doaj.art-08092661b7fe47c6a93c5ec69d8cf55a2022-12-21T18:18:58ZengInternational Institute for the Science of Sintering, BeogradScience of Sintering0350-820X1820-74132014-01-0146216918410.2298/SOS1402169S0350-820X1402169SOrigin of unusual sintering phenomena in compacts of chloride-derived 3Y-TZP nanopowdersSweeney Sean M.0Mayo Merrilea J.1GE Global Research, One Research Circle, Niskayuna, USAMayo Enterprises, LLC, North Potomac, USAAfter evaluating three alternative possibilities, the present study shows that seemingly minor amounts (at least as low as 0.06 wt%) of chlorine impurities are responsible for the poor sintering behavior observed in chloride-derived 3 mol% yttria stabilized zirconia (3Y-TZP) nanopowders. Models and quantitative estimates are used to explain the role of evolved HCl and ZrCl4 gases in such anomalous behaviors as reduced sintered densities for higher green densities, de-densification, improved sintering in nitrogen over oxygen, and formation of a dense shell microstructure. Two solutions to problematic residual chlorides are compared: 1) a thermal treatment composed of an extended hold at 1000°C to allow HCl gas removal before the onset of closed porosity, and 2) a chemical treatment performed by washing bisque-fired samples at room temperature using a concentrated ammonium hydroxide solution to remove chlorides. The thermal treatment was found to be superior.http://www.doiserbia.nb.rs/img/doi/0350-820X/2014/0350-820X1402169S.pdfsinteringzirconiachlorinede-densificationnanopowder |
| spellingShingle | Sweeney Sean M. Mayo Merrilea J. Origin of unusual sintering phenomena in compacts of chloride-derived 3Y-TZP nanopowders Science of Sintering sintering zirconia chlorine de-densification nanopowder |
| title | Origin of unusual sintering phenomena in compacts of chloride-derived 3Y-TZP nanopowders |
| title_full | Origin of unusual sintering phenomena in compacts of chloride-derived 3Y-TZP nanopowders |
| title_fullStr | Origin of unusual sintering phenomena in compacts of chloride-derived 3Y-TZP nanopowders |
| title_full_unstemmed | Origin of unusual sintering phenomena in compacts of chloride-derived 3Y-TZP nanopowders |
| title_short | Origin of unusual sintering phenomena in compacts of chloride-derived 3Y-TZP nanopowders |
| title_sort | origin of unusual sintering phenomena in compacts of chloride derived 3y tzp nanopowders |
| topic | sintering zirconia chlorine de-densification nanopowder |
| url | http://www.doiserbia.nb.rs/img/doi/0350-820X/2014/0350-820X1402169S.pdf |
| work_keys_str_mv | AT sweeneyseanm originofunusualsinteringphenomenaincompactsofchloridederived3ytzpnanopowders AT mayomerrileaj originofunusualsinteringphenomenaincompactsofchloridederived3ytzpnanopowders |