期刊
CERAMICS INTERNATIONAL
卷 47, 期 19, 页码 27334-27341出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.06.155
关键词
Microwave sintering; Sol-gel synthesis; Dielectric properties; Structural applications; ZrO2-TiO2
资金
- Generalitat Valenciana [GRISOLIAP/2018/168]
- Ministry of Science, Innovation and Universities (Spain) (MCIU/AEI/FEDER, UE) [RTI2018-099033-B-C32, RTI2018-099033-B-C33, RYC-2016-20915]
Microwave sintering of 3Y-TZP/TiO2 materials at low temperatures (1200-1300 degrees C) results in dense, coarse-grained, and hard material with significantly reduced thermal expansion coefficient. Compared to conventional sintering methods, microwave sintering shows higher efficiency in energy consumption.
The sinterability of 3Y-TZP/TiO2 materials using micrometre-sized ZrO2 and nanometre-sized TiO2 (16 wt%) by one-step fast microwave sintering at low temperature (1200-1300 degrees C) 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 degrees 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 mu m), quite hard (-13.7 GPa) 3Y-TZP/TiO2 material. However, the most important feature is the significant reduction of the thermal expansion coefficient (8.10- 6 K-1) as compared to that of 3YTZP. In addition, the results from conventional sintering at 1400-1500 degrees C with 2 and 6 h of dwell time are examined and compared. The materials obtained at 1500 degrees 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.
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