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织构化多孔Al2O3­SiO2复合陶瓷片-球混合浆料特性及光强分布仿真

武向权1,2,*, 滕家琛1, 季祥旭1, 郝禹博1, 张忠明1,2, 徐春杰1,2,*   

  1. 1.西安理工大学 材料科学与工程学院,西安 710048;
    2.西安理工大学 谢赫特曼诺奖新材料研究院,西安 710048
  • 修回日期:2023-12-04 接受日期:2024-02-06 出版日期:2024-02-22 网络出版日期:2024-02-22
  • 作者简介:武向权(1989–), 男, 讲师. E-mail: xqwu@xaut.edu.cn
  • 基金资助:
    陕西省重点研发计划一般项目(2024GX-YBXM-225);西安市科技计划项目(22GXFW0072);中国博士后面上基金资助项目(2021MD703876);陕西省国际科技合作计划项目-重点项目(2023-GHZD-50)

Textured Porous Al2OSiO2 Composite Ceramic Platelet-sphere Slurry Characteristics and Corresponding Light Intensity Distribution Simulation

WU Xiangquan1,2*, TENG Jiachen1, JI Xiangxu1, HAO Yubo1, ZHANG Zhongming1,2, XU Chunjie1,2*   

  1. 1. School of Materials Science, Engineering, Xi'an University of Technology, Xi'an710048, China;
    2. Xi'an Shechtman Nobel Prize New Materials Institute, Xi'an University of Technology, Xi'an710048, China
  • Revised:2023-12-04 Accepted:2024-02-06 Published:2024-02-22 Online:2024-02-22
  • About author:WU Xiangquan (1989–), male, assistant professor. E-mail: xqwu@xaut.edu.cn
  • Supported by:
    General Project of Shaanxi Key Research and Development Plan (2024GX-YBXM-225); Xi’an Bureau of Science and Technology(22GXFW0072); the Project funded by China Postdoctoral Science Foundation (2021MD703876); International Science and Technology Cooperation Program of Shaanxi Province(2023-GHZD-50)

摘要: 陶瓷光固化技术在制备Al2O3­SiO2复合陶瓷方面具有广阔前景,织构化的Al2O3­SiO2复合陶瓷在陶瓷光固化增材制备方面亟待研究。本工作研究了添加片状氧化铝、等轴氧化铝、球形二氧化硅的片-球混合陶瓷光固化浆料特性。针对不同固相配比,研究了浆料的黏度、沉降性、固化特性、固化精度,并针对所研究的片-球混合浆料开发了一种紫外光强分布模拟算法,对浆料在曝光中的光强分布进行了理论模拟分析,最终成功制备了具有片状氧化铝定向特征的织构化多孔Al2O3­SiO2复合陶瓷。研究结果表明,片状氧化铝与球状粉体组合可以使浆料在高固相含量(总固相体积分数40%~45%,片状氧化铝占50%~60%)下保持低黏度和剪切稀释性。在相同总固相含量下,增加片状氧化铝含量或增加球形二氧化硅的含量能够减小浆料的黏度,从而增大了浆料的沉降率。片状氧化铝相比于等轴氧化铝可以减少浆料对紫外光的阻挡和散射作用。在相同曝光能量条件下,减少等轴氧化铝、增加球形二氧化硅可以增加的浆料固化厚度;而增加片状氧化铝和球状二氧化硅含量会增大尺寸误差。理论模拟结果表明,接近水平分布的片状氧化铝对光阻挡和偏转作用弱,接近垂直分布的片状氧化铝对紫外光具有引导作用。模型上边界紫外光强平均值的变化与固化厚度测量值的变化值接近,所建立的模型可以为浆料固化厚度的实验测试结果提供理论支持。

关键词: 陶瓷光固化, Al2O3­SiO2复合陶瓷, 片状氧化铝, 光强分布模拟, 浆料特性

Abstract: Ceramic stereolithography has a broad prospect in the preparation of Al2O3­SiO2 composite ceramics. The textured Al2O3­SiO2 composite preparation through ceramic stereolithography still need to be investigated. In this paper, we investigated the characteristics of ceramic slurries with addition of alumina platelet, equiaxed alumina, and spherical silica. A comparative analysis of the viscosity, sedimentation, curing characteristics, curing accuracy of the slurries with different solid content was carried out. An ultraviolet (UV) light intensity distribution simulation algorithm was developed, and the theoretical simulation analysis of the light intensity distribution in the slurry during exposure process was carried out. The textured porous Al2O3­SiO2 composite with the characteristics of oriented alumina platelet was successfully prepared. The results showed that the combination of alumina platelet with spherical powders allowed the slurry to maintain low viscosity and shear shinning behavior at high solid content (40%-45% total solid content, alumina platelet accounted for 50%-60% of the total solid content). At the same total solid content, increasing the amount of alumina platelet or increasing the amount of spherical silica could reduce the viscosity of the slurry, while increase the sedimentation of the slurry. Alumina platelet reduced the blocking and scattering effect of UV light in the slurry compared to equiaxed alumina. Under the same exposure energy condition, decreasing the content of the equiaxed alumina and increasing the spherical silica could increase the curing thickness of the slurry, while increasing the content of platelet alumina and spherical silica led to an increase in dimensional error. Numerical simulation results showed that alumina platelet with near horizontal distribution had week effect on UV light blocking and deflection, and alumina platelet with near vertical distribution had guiding effect on UV light. The variation of the mean UV intensity at the upper boundary of the model were close to the variation of the curing thickness. The established model can provide theoretical support for the experimental test results of the curing thickness.

Key words: ceramic stereolithography, Al2O3­SiO2 composite ceramics, alumina platelet, light intensity distribution simulation, slurry characterization

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