University of Oulu

Hao, X., Yang, M., Huang, W., Zhang, F., Gao, L., Omran, M., & Chen, G. (2022). Study on drying kinetics of calcium oxide doped zirconia by microwave-assisted drying. Ceramics International, 48(20), 30430–30440.

Study on drying kinetics of calcium oxide doped zirconia by microwave-assisted drying

Saved in:
Author: Hao, Xiandong1; Yang, Mingxia1; Huang, Weiwei1;
Organizations: 1Kunming Key Laboratory of Energy Materials Chemistry, Yunnan Minzu University, Kunming, 650500, PR China
2Faculty of Technology, University of Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2022
Publish Date: 2024-07-02


Ca–ZrO₂ is an essential structural and functional material, which is commonly used in refractories, electronic ceramics, and functional ceramics. The properties of Ca–ZrO₂ materials are depending on the quality of Ca–ZrO₂ powders. The main factors affecting the quality of powder are sintering temperature and the drying effect. This paper applied modern microwave drying technology to dry Ca–ZrO₂ powder. The impact of initial mass, microwave heating power, and initial moisture content on the drying of Ca–ZrO₂ were explored. The results showed that the average drying rate increased with the rise of initial mass, microwave heating power, and initial moisture content. Wang and Singh, Page, and Quadratic Model were applied to fit Ca–ZrO₂ with an initial moisture content of 5.6%, mass of 30 g, and microwave output power of 400 W. The results displayed that the Page model had a better fitting effect. It was also applicable to other different initial moisture content, original mass, and microwave heating power. The diffusion coefficient calculated by Fick’s second law displayed that with the increase of initial mass, initial moisture content, and microwave heating power of Ca–ZrO₂, the effective diffusion coefficient increased first and then declined. When the Ca–ZrO₂ of microwave heating power was 640 W, mass was 30 g, and the moisture content was 5.65%, the effective diffusion coefficients of zirconia were 1.42533 × 10−13, 2.91806 × 10−13, 5.652.2471 × 10−13 m²/s, respectively. To determine the activation energy of microwave dried zirconia, using the relationship between microwave power and activation energy, the activation energy of microwave dried zirconia was calculated to be −23.39 g/W. This paper aims to rich experimental data for the industrial application of microwaves to strengthen dried zirconia and propose a theoretical basis.

see all

Series: Ceramics international
ISSN: 0272-8842
ISSN-E: 1873-3956
ISSN-L: 0272-8842
Volume: 48
Issue: 20
Pages: 30430 - 30440
DOI: 10.1016/j.ceramint.2022.06.321
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: Financial support from Innovative Research Team (in Science and Technology) in University of Yunnan Province and the National Natural Science Foundation of China (Grant No. 51764052).
Copyright information: © 2022. This manuscript version is made available under the CC-BY-NC-ND 4.0 license