Dielectric, mechanical and thermal properties of ZrO2–TiO2 materials obtained by microwave sintering at low temperature
| Autor: | René M. Guillén, Felipe L. Peñaranda, Amparo Borrell, P. Recio, Rut Benavente, María Dolores Salvador, Rodrigo Moreno |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Sol-gel synthesis Sintering Microwave sintering 02 engineering and technology Dielectric 01 natural sciences Thermal expansion TEORÍA DE LA SEÑAL Y COMUNICACIONES Structural applications CIENCIA DE LOS MATERIALES E INGENIERIA METALURGICA 0103 physical sciences Homogeneity (physics) Materials Chemistry Composite material Penetration depth 010302 applied physics Process Chemistry and Technology ZrO2-TiO2 021001 nanoscience & nanotechnology Microstructure Grain size Surfaces Coatings and Films Electronic Optical and Magnetic Materials Dielectric properties Ceramics and Composites 0210 nano-technology Microwave |
| Zdroj: | Ceramics International. 47:27334-27341 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2021.06.155 |
| Popis: | [EN] The sinterability of 3Y-TZP/TiO2 materials using micrometre-sized ZrO2 and nanometre-sized TiO (16 wt%) by one-step fast microwave sintering at low temperature (1200¿1300C) was investigated. Firstly, in situ detailed analysis of the dielectric properties of the material with temperature was carried out in order to measure the capacity of the material to transform microwave energy into heat. Another related parameter associated to microwave sintering is the penetration depth of the microwave radiation into the material, which showed great homogeneity from 400¿C. Secondly, the effect of sintering conditions on microstructure, density, hardness and coefficient of thermal expansion was evaluated. The X-ray diffraction study and microstructural characterization demonstrate that it is possible to obtain fully dense pieces (>99%) by microwave sintering, a condition yielding to a coarse-grained (~1¿2 ¿m), quite hard (~13.7 GPa) 3Y-TZP/TiO material. However, the most important feature is the significant reduction of the thermal expansion coefficient as compared to that of 3Y- TZP. In addition, the results from conventional sintering at 1400¿1500 C with 2 and 6 h of dwell time are examined and compared. The materials obtained at 1500¿C showed high density with grain size and hardness similar to those obtained by microwave but with a dramatic difference in the power consumption of the sintering cycle, since the materials obtained by microwave used a maximum absorbed power of 120 W and a heating cycle of only 40 min. The authors are grateful to the Generalitat Valenciana for the fund-ing support for the Santiago Grisolia program (GRISOLIAP/2018/168) and to the Ministry of Science, Innovation and Universities (Spain) through the projects RTI2018-099033-B-C32 and C33 (MCIU/AEI/FEDER, UE) and RYC-2016-20915. |
| Databáze: | OpenAIRE |
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