织构化多孔Al_(2)O_(3)-SiO_(2)复合陶瓷片-球混合浆料特性及光强分布仿真  

Textured Porous Al_(2)O_(3)-SiO_(2)Composite Ceramic Platelet-sphere Slurry:Characteristics and Simulation of Light Intensity Distribution

作　　者：武向权 滕家琛 季祥旭 郝禹博 张忠明[1,2] 徐春杰[1,2] WU Xiangquan;TENG Jiachen;JI Xiangxu;HAO Yubo;ZHANG Zhongming;XU Chunjie(School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,China;Xi’an Shechtman Nobel Prize New Materials Institute,Xi'an University of Technology,Xi’an 710048,China)

机构地区：[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

出　　处：《无机材料学报》2024年第7期769-778,共10页Journal of Inorganic Materials

基　　金：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(2021MD703876);陕西省国际科技合作计划重点项目(2023-GHZD-50)。

摘　　要：陶瓷光固化技术在制备Al_(2)O_(3)-SiO_(2)复合陶瓷方面具有广阔前景,织构化的Al_(2)O_(3)-SiO_(2)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的特性。针对不同固相配比,研究了浆料的黏度、沉降性、固化特性和固化精度,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Al_(2)O_(3)-SiO_(2)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%,片状氧化铝体积分数占50%~60%)下保持低黏度和剪切稀释性。在相同总固相含量下,增大片状氧化铝或球形二氧化硅的含量能够减小浆料的黏度,从而提高浆料的沉降率。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,降低等轴氧化铝、增加球形二氧化硅的含量可以增加的浆料固化厚度;而增加片状氧化铝和球形二氧化硅的含量会扩大尺寸误差。理论模拟结果表明,接近水平分布的片状氧化铝对光的阻挡和偏转作用弱,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。Ceramic stereolithography has a broad prospect in preparation of Al_(2)O_(3)-SiO_(2)composite ceramics through which the prepared textured Al_(2)O_(3)-SiO_(2)composite still faces challenges in improving their slurry quality and light intensity distribution.Here,characteristics of a novel ceramic slurry with addition of alumina platelet,equiaxed alumina,and spherical silica were investigated.Comparative analysis on viscosity,sedimentation,curing characteristics,and curing accuracy of the slurry with different solid content was carried out.Simulation algorithm of ultraviolet(UV)light intensity distribution was developed,and theoretical simulation analysis of light intensity distribution in the slurry during light exposure was carried out.Results of the prepared textured porous Al_(2)O_(3)-SiO_(2)composite with the characteristics of oriented alumina platelet showed that combination of alumina platelet with spherical powders endowed the slurry with low viscosity and shear shinning behavior at high solid content in volume(40%-45%)of which alumina platelet took 50%-60%.Under the same content of the total solid,increasing either amount of alumina platelet or amount of spherical silica could reduce the viscosity,leading to the increase of the slurry total sedimentation.Alumina platelet in the slurry could reduce blocking and scattering of UV light better than equiaxed alumina.Under the same exposure conditions,both decreasing content of the equiaxed alumina and increasing content of the spherical silica could increase curing thickness of the slurry,while increasing content of alumina platelet and spherical silica could adversely increase error in dimension.Numerical simulation results showed that alumina platelet with approximately horizontal distribution showed week effect on UV light blocking and deflection,while that with approximately vertical distribution showed indeed guiding effect on UV light.The variation of the mean UV intensity at the upper boundary of the model was close to that of the curing thickness.Ther

关 键 词：陶瓷光固化 Al_(2)O_(3)-SiO_(2)复合陶瓷 片状氧化铝 光强分布模拟 浆料特性 

分 类 号：TB321[一般工业技术—材料科学与工程]