Transparent YAG material prepared from nano-powder with core-shell morphology
- Resource Type
- Authors
- Mirosław M. Bućko; Anita Trenczek-Zając; Łukasz Łańcucki; Kamil Wojciechowski; Radosław Lach; Magdalena Stan
- Source
- Ceramics International. 45:19141-19147
- Subject
- 010302 applied physics
Ammonium carbonate
Materials science
Precipitation (chemistry)
Process Chemistry and Technology
Oxide
chemistry.chemical_element
Sintering
02 engineering and technology
Yttrium
021001 nanoscience & nanotechnology
01 natural sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
chemistry.chemical_compound
chemistry
Chemical engineering
0103 physical sciences
Materials Chemistry
Ceramics and Composites
Aluminium oxide
Slurry
0210 nano-technology
Porosity
- Language
- ISSN
- 0272-8842
A powder with core-shell morphology was used to obtain a dense yttrium-aluminium garnet material. Precipitation of a Y 2 O 3 precursor in an aluminium oxide slurry, using ammonium carbonate, allowed nanometric particles of the yttrium oxide precursor to be deposited on submicron Al 2 O 3 grains. It was found that washing of the precipitation product changes the chemical composition of the precursor which has a significant impact on the evolution of a phase composition of powders during the heat treatment process and finally on their morphology. Pressureless sintering at 1650 °C for 2 h of the unwashed powder led to a single-phased material without open porosity reaching approx. 96% of the theoretical density while during sintering under the same conditions the compact of the washed powder did not completely close pores and its density was not higher than 92%. The use of isostatic hot-pressing process allowed a complete elimination of porosity in the materials obtained from the unwashed powder to occur.