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<p>The additional sintering pressure induced by curvature reversal during pore shrinkage was calculated. During the calculation, the grain size (1&#xa0;μm) and the dihedral angle (φ = 150°) were kept constant, and the sintering pressure was evaluated assuming surface energies of 0.9, 1.0, and 1.1&#xa0;J/m² as a spherical pore with an initial radius of 5&#xa0;μm shrank to 0.5&#xa0;μm. By tracking the radius of curvature of the grains during pore shrinkage, the point of curvature reversal (pore radius of 1.935&#xa0;μm) was identified. A comparison of the increase in sintering pressure before and after curvature reversal showed that, with an increase in surface energy (0.1&#xa0;J/m²), the magnitude of pressure increase after curvature reversal reached 480&#xa0;kPa at a pore radius of 0.5&#xa0;μm, which is significantly larger than the 40&#xa0;kPa observed at a pore radius of 5&#xa0;μm before curvature reversal. The effect of curvature reversal on the increase in sintering pressure was quantified by comparison with a regression curve obtained under conditions without curvature reversal. As a result, up to 0.9&#xa0;MPa of additional sintering pressure was found to be induced by curvature reversal, corresponding to 18% of the total sintering pressure. This increase in sintering pressure due to curvature reversal arises from the reversal in the direction of the shrinkage pressure generated by surface tension, changing from acting outward to inward on the pore. The pore radius during the curvature reversal process was explained by constructing the microstructure based on curvature.</p>

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Estimation of additional sintering pressure induced by curvature reversal and the effect of surface energy during pore shrinkage

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Kyung-Sik Oh

摘要

The additional sintering pressure induced by curvature reversal during pore shrinkage was calculated. During the calculation, the grain size (1 μm) and the dihedral angle (φ = 150°) were kept constant, and the sintering pressure was evaluated assuming surface energies of 0.9, 1.0, and 1.1 J/m² as a spherical pore with an initial radius of 5 μm shrank to 0.5 μm. By tracking the radius of curvature of the grains during pore shrinkage, the point of curvature reversal (pore radius of 1.935 μm) was identified. A comparison of the increase in sintering pressure before and after curvature reversal showed that, with an increase in surface energy (0.1 J/m²), the magnitude of pressure increase after curvature reversal reached 480 kPa at a pore radius of 0.5 μm, which is significantly larger than the 40 kPa observed at a pore radius of 5 μm before curvature reversal. The effect of curvature reversal on the increase in sintering pressure was quantified by comparison with a regression curve obtained under conditions without curvature reversal. As a result, up to 0.9 MPa of additional sintering pressure was found to be induced by curvature reversal, corresponding to 18% of the total sintering pressure. This increase in sintering pressure due to curvature reversal arises from the reversal in the direction of the shrinkage pressure generated by surface tension, changing from acting outward to inward on the pore. The pore radius during the curvature reversal process was explained by constructing the microstructure based on curvature.