Low-temperature synthesis of ZrB2 nano-powders using a sorbitol modified sol–gel processing route
| Autor: | Huiming Ji, Yang Ming, Li Minmin, Hongna Fan, Ji Guangyi, Xiaohong Sun |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Zirconium diboride
Materials science General Chemical Engineering Inorganic chemistry chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Transmission electron microscopy Carbothermic reaction Differential thermal analysis Cubic zirconia Sorbitol Fourier transform infrared spectroscopy Sol-gel |
| Zdroj: | Advanced Powder Technology. 25:910-915 |
| ISSN: | 0921-8831 |
| DOI: | 10.1016/j.apt.2014.01.005 |
| Popis: | High-purity zirconium diboride nano-powders were synthesized by carbothermal reduction reaction at a relatively low temperature from a novel sorbitol modified sol–gel method. Phase composition and morphology of the ZrB 2 nano-powders were characterized by X-ray diffraction and transmission electron microscopy, respectively. The effect of sorbitol on sol–gel process and the formation mechanism of ZrB 2 powders were investigated by fourier transform infrared spectroscopy and thermo gravimetric/differential thermal analysis. Sorbitol, used as bridging and chelating ligand, led to the formation of chelate complex through its polyhydroxy opening reaction with H 3 BO 3 , and then induced the condensation of zirconia forming Zr–O–C–B network, which promoted the carbothermal reduction reaction to complete at 1450 °C for 1 h. The synthesized powders exhibited near-spherical morphology with a small average crystalline size of about 100 nm. With respect to the conventional solid state method, the sorbitol modified sol–gel method route guaranteed a faster, easier and energy-saving process for obtaining single-phase nano-powders. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect