增强相种类对DLP制备氧化硅基复合陶瓷性能的影响

Influence of reinforcement phase types on properties of silica-based composite ceramics fabricated by DLP technology

摘要

氧化硅陶瓷因其优异的介电性能与热稳定性，在天线罩材料领域具有广泛应用。然而，传统陶瓷成形工艺难以满足复杂结构构件的制备需求。为提升氧化硅陶瓷的成形质量与力学性能，本工作采用数字光处理（digital light processing，DLP）增材制造技术，系统研究不同增强相类型对氧化硅基复合陶瓷性能的影响。以氧化硅为基体，分别引入莫来石颗粒、氮化铝颗粒及氧化铝包覆颗粒作为增强相，制备多组复合陶瓷样品，并对其相组成、显微结构、体积密度及抗弯强度等性能进行表征与分析。结果表明，增强相种类显著影响氧化硅基复合陶瓷中方石英的析出行为及致密化过程。其中，以莫来石颗粒为增强相时，样品综合性能最优，其垂直与水平方向的收缩率分别为8.73%和8.66%，显气孔率为17.44%，体积密度为1.80 g/cm³，抗弯强度最高，可达17.94 MPa。

Abstract

Silica-based ceramics are widely used in radome applications due to their excellent dielectric properties and thermal stability. However，traditional ceramic forming techniques face significant challenges in fabricating components with complex geometries. To improve the forming quality and mechanical properties of silica ceramics，this study employs Digital Light Processing (DLP)-based additive manufacturing to investigate the effects of different reinforcement phases. Using photosensitive resin as the matrix，composite ceramic samples are prepared by incorporating mullite particles，aluminum nitride particles，and alumina-coated particles as reinforcements. The phase composition，microstructure，bulk density，and flexural strength of the samples are systematically characterized. The results indicate that the type of reinforcement significantly affects the crystallization behavior of cristobalite and the densification process of the ceramics. Among all reinforcements，mullite particles yield the best overall performance，with vertical and horizontal shrinkage rates of 8.73% and 8.66%，open porosity of 17.44%，a bulk density of 1.80 g/cm³，and a maximum flexural strength of 17.94 MPa.

关键词

氧化硅陶瓷 / 数字光处理 / 增强相 / 莫来石 / 力学性能

Key words

silica ceramic / digital light processing (DLP) / reinforcement phase / mullite / mechanical property

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