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<p>Silica ceramics have attracted considerable attention across various fields due to their excellent properties, however, traditional preparation methods make it difficult to precisely fabricate complex geometric structures. Additive manufacturing (e.g., light-curing 3D printing) offers a promising approach to address this issue, however, the inherently low strength of pure silica ceramics limits their practical applications. In this study, particle surface modification was employed to reduce light scattering losses and thereby improve the fabrication accuracy of ceramic samples. The light intensity distribution and light scattering of suspensions of different micron-sized particles (ZrO<sub>2</sub>, TiO<sub>2</sub> and B<sub>2</sub>O<sub>3</sub>) during the curing process are systematically analyzed by the finite element method, and an innovative strategy for reducing light scattering and regulating the shrinkage rate through particle surface modification is proposed. Under 405&#xa0;nm UV irradiation, the zirconia particle suspension exhibits the most uniform light intensity distribution. In addition, among the tested additives (titanium oxide, boron oxide, and zirconia), zirconia exhibits the most pronounced enhancement in the mechanical properties of silica ceramics when used as a sintering aid. At the sintering temperature of 1400&#xa0;°C, its bulk density and flexural strength increased from 1.855 ± 0.021&#xa0;g/cm<sup>3</sup> and 7.02 ± 0.70&#xa0;MPa (without sintering aids) to 2.11 ± 0.015&#xa0;g/cm<sup>3</sup> and 11.86 ± 0.35&#xa0;MPa, respectively. While improving strength, the dimensional accuracy of the printed parts is maintained, offering a feasible solution for applications such as precision casting and biomedical implants that demand both high strength and precision.</p>

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Effects of sintering additives on dimensional accuracy and strength of 3D-printed silica ceramics

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Jie Zhang,
  • He Li,
  • Shengxian Sun

摘要

Silica ceramics have attracted considerable attention across various fields due to their excellent properties, however, traditional preparation methods make it difficult to precisely fabricate complex geometric structures. Additive manufacturing (e.g., light-curing 3D printing) offers a promising approach to address this issue, however, the inherently low strength of pure silica ceramics limits their practical applications. In this study, particle surface modification was employed to reduce light scattering losses and thereby improve the fabrication accuracy of ceramic samples. The light intensity distribution and light scattering of suspensions of different micron-sized particles (ZrO2, TiO2 and B2O3) during the curing process are systematically analyzed by the finite element method, and an innovative strategy for reducing light scattering and regulating the shrinkage rate through particle surface modification is proposed. Under 405 nm UV irradiation, the zirconia particle suspension exhibits the most uniform light intensity distribution. In addition, among the tested additives (titanium oxide, boron oxide, and zirconia), zirconia exhibits the most pronounced enhancement in the mechanical properties of silica ceramics when used as a sintering aid. At the sintering temperature of 1400 °C, its bulk density and flexural strength increased from 1.855 ± 0.021 g/cm3 and 7.02 ± 0.70 MPa (without sintering aids) to 2.11 ± 0.015 g/cm3 and 11.86 ± 0.35 MPa, respectively. While improving strength, the dimensional accuracy of the printed parts is maintained, offering a feasible solution for applications such as precision casting and biomedical implants that demand both high strength and precision.