Optimization of Slip Casting Parameters of Alumina Yttria Nanocomposite Powder for Obtaining Transparent Yttrium Aluminum Garnet Ceramics
In this study, Spark Plasma Sintering (SPS) of both slip casted and powder specimens of alumina/ yttria core-shell nanocomposite were utilized for fabricating transparent Yttrium Aluminum Garnet (YAG) ceramics. Phase evolution, optical transmittance and the microstructure of sinte...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | fas |
| Published: |
Isfahan University of Technology
2017-11-01
|
| Series: | Journal of Advanced Materials in Engineering |
| Subjects: | |
| Online Access: | http://jame.iut.ac.ir/browse.php?a_code=A-10-1462-1&slc_lang=en&sid=1 |
| _version_ | 1818619836910010368 |
|---|---|
| author | G. Kafili B. movahedi M. Milani |
| author_facet | G. Kafili B. movahedi M. Milani |
| author_sort | G. Kafili |
| collection | DOAJ |
| description | In this study, Spark Plasma Sintering (SPS) of both slip casted and powder specimens of alumina/ yttria core-shell nanocomposite were utilized for fabricating transparent Yttrium Aluminum Garnet (YAG) ceramics. Phase evolution, optical transmittance and the microstructure of sintered samples were compared. In slip casting process, Dolapix CE64 was used as a dispersant for preparing the stable aqueous slurry of this nanocomposite powder. The effect of Dolapix concentration and pH value on the stability of the suspension was described, and the viscosity diagrams were investigated at different pH value and different weight percents of Dolapix. The rheological behavior of the nanocomposite powder slipped at 60-70 wt% solid loading was studied by measuring their viscosity and shear stress as a function of shear rate of the slurry. The results showed that, the suspension has a minimum viscosity at pH of 10 by addition of 2.5 wt% Dolapix. Also, the slurry with solid loading of 60 wt% showed the Newtonian behavior and this rheological behavior was preserved even above this solid loading values. Slip casting technique caused the uniform size and pores distribution as well as eliminating large pores in the green body. Consequently, transparent YAG ceramic with 60% optical transmittance was achieved after SPS process of slip casted green body which was much higher than that of nanocomposite powder, i.e. about 30% at the same sintering conditions.
|
| first_indexed | 2024-12-16T17:43:49Z |
| format | Article |
| id | doaj.art-06af3a4d3ea64e4b970fdb0cdab53be2 |
| institution | Directory Open Access Journal |
| issn | 1025-2851 2423-5733 |
| language | fas |
| last_indexed | 2024-12-16T17:43:49Z |
| publishDate | 2017-11-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Advanced Materials in Engineering |
| spelling | doaj.art-06af3a4d3ea64e4b970fdb0cdab53be22022-12-21T22:22:31ZfasIsfahan University of TechnologyJournal of Advanced Materials in Engineering1025-28512423-57332017-11-013635162Optimization of Slip Casting Parameters of Alumina Yttria Nanocomposite Powder for Obtaining Transparent Yttrium Aluminum Garnet CeramicsG. Kafili0B. movahedi1M. Milani2 1. Department of Nanotechnology Engineering, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, Iran. 1. Department of Nanotechnology Engineering, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, Iran. Advanced Materials & Renewable Energies Research Center, Iranian Research Organization for Science and Technology, Tehran, Iran. In this study, Spark Plasma Sintering (SPS) of both slip casted and powder specimens of alumina/ yttria core-shell nanocomposite were utilized for fabricating transparent Yttrium Aluminum Garnet (YAG) ceramics. Phase evolution, optical transmittance and the microstructure of sintered samples were compared. In slip casting process, Dolapix CE64 was used as a dispersant for preparing the stable aqueous slurry of this nanocomposite powder. The effect of Dolapix concentration and pH value on the stability of the suspension was described, and the viscosity diagrams were investigated at different pH value and different weight percents of Dolapix. The rheological behavior of the nanocomposite powder slipped at 60-70 wt% solid loading was studied by measuring their viscosity and shear stress as a function of shear rate of the slurry. The results showed that, the suspension has a minimum viscosity at pH of 10 by addition of 2.5 wt% Dolapix. Also, the slurry with solid loading of 60 wt% showed the Newtonian behavior and this rheological behavior was preserved even above this solid loading values. Slip casting technique caused the uniform size and pores distribution as well as eliminating large pores in the green body. Consequently, transparent YAG ceramic with 60% optical transmittance was achieved after SPS process of slip casted green body which was much higher than that of nanocomposite powder, i.e. about 30% at the same sintering conditions. http://jame.iut.ac.ir/browse.php?a_code=A-10-1462-1&slc_lang=en&sid=1Slip casting Spark plasma sintering Yttrium aluminum garnet Transparent ceramic. |
| spellingShingle | G. Kafili B. movahedi M. Milani Optimization of Slip Casting Parameters of Alumina Yttria Nanocomposite Powder for Obtaining Transparent Yttrium Aluminum Garnet Ceramics Journal of Advanced Materials in Engineering Slip casting Spark plasma sintering Yttrium aluminum garnet Transparent ceramic. |
| title | Optimization of Slip Casting Parameters of Alumina Yttria Nanocomposite Powder for Obtaining Transparent Yttrium Aluminum Garnet Ceramics |
| title_full | Optimization of Slip Casting Parameters of Alumina Yttria Nanocomposite Powder for Obtaining Transparent Yttrium Aluminum Garnet Ceramics |
| title_fullStr | Optimization of Slip Casting Parameters of Alumina Yttria Nanocomposite Powder for Obtaining Transparent Yttrium Aluminum Garnet Ceramics |
| title_full_unstemmed | Optimization of Slip Casting Parameters of Alumina Yttria Nanocomposite Powder for Obtaining Transparent Yttrium Aluminum Garnet Ceramics |
| title_short | Optimization of Slip Casting Parameters of Alumina Yttria Nanocomposite Powder for Obtaining Transparent Yttrium Aluminum Garnet Ceramics |
| title_sort | optimization of slip casting parameters of alumina yttria nanocomposite powder for obtaining transparent yttrium aluminum garnet ceramics |
| topic | Slip casting Spark plasma sintering Yttrium aluminum garnet Transparent ceramic. |
| url | http://jame.iut.ac.ir/browse.php?a_code=A-10-1462-1&slc_lang=en&sid=1 |
| work_keys_str_mv | AT gkafili optimizationofslipcastingparametersofaluminayttriananocompositepowderforobtainingtransparentyttriumaluminumgarnetceramics AT bmovahedi optimizationofslipcastingparametersofaluminayttriananocompositepowderforobtainingtransparentyttriumaluminumgarnetceramics AT mmilani optimizationofslipcastingparametersofaluminayttriananocompositepowderforobtainingtransparentyttriumaluminumgarnetceramics |