4.7 Article

Numerical simulation and experimental verification of dry pressed MgTiO3 ceramic body during pressureless sintering

Journal

JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 104, Issue 9, Pages 4408-4419

Publisher

WILEY
DOI: 10.1111/jace.17888

Keywords

densification; MgTiO3; numerical simulation; pressureless sintering; SOVS model

Funding

  1. National Natural Science Foundation of China [U1806221, 51672198]
  2. Innovation and Development Project of Zibo City [2017CX01A022]
  3. Instruction & Development Project for National Funding Innovation Demonstration Zone of Shandong Province [2017-41-1, 2017-41-3, 2018ZCQZB01, 2019ZCQZB03]
  4. Central Guiding Local Science and Technology Development Special Funds [2060503]
  5. Key Research & Design Program of Shandong Province [2019GGX102011]

Ask authors/readers for more resources

The study employed numerical simulation to investigate the densification behavior of MgTiO3 ceramics during pressureless sintering, showing high accuracy in predicting densification and grain growth trends. The results provide a reliable method for designing and manufacturing microwave dielectric products.
To clarify the densification law of dry pressed MgTiO3 ceramic body during pressureless sintering, SOVS model (Skorohod-Olevsky Viscous Sintering model) modified with creep characteristics was embedded into finite element software Abaqus. The selected model can effectively express the grain boundary characteristics and densification mechanism. The change law of relative density, shrinkage rate, sintering stress, and grain size of MgTiO3 cylindrical specimens was investigated by the above numerical simulation method. It showed that the average relative density of ceramic body rose from 60% to 97%, and the shrinkage rate respectively reached 17.28% and 11.99% in axial and radial direction. The average grain size increased from 1 to 6 mu m. In order to verify the accuracy of the simulation results, corresponding sintering experiments on cylindrical specimens were carried out to obtain actual sintering densities and shrinkage rates. It showed that the errors of relative density and shrinkage were below 5% and 2%. Grain growth trend was also basically consistent with the simulation results. After that, the above numerical simulation method was applied into the prediction of fabricating MgTiO3 filter with complex structure. Therefore, the present work provided a reliable numerical simulation method to predict the densification behavior of MgTiO3 ceramics during the pressureless sintering process, which was helpful to design and fabricate microwave dielectric products.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available