基于精细直写成型的三维立体陶瓷制备

Fine Direct Ink Writing of 3D Ceramics

以锆钛酸铅镧(PLZT)粉料配制陶瓷浆料,通过无模直写成型技术制备了多种结构参数可控、线条直径为200μm的三维立体结构。浆料属于剪切变稀型流体;1050℃铅气氛保护下烧结的样品成瓷效果良好,计算烧结收缩率为25%。S形层叠结构可用于制备2-2型压电复合材料,三维连通的木堆结构和圆柱形结构可用于3-3型压电复合材料的成型。以木堆结构为例制备了3-3型PLZT-Epoxy压电陶瓷-聚合物复合材料。浆料无模直写成型技术可以设计成型不同形状的高精度三维复杂结构,在复合材料骨架的制备上有潜在的应用。

An experimental set-up was designed for measuring the self-field losses of Bi2223/Ag HTS tapes using a transport current method. A kind of lead lanthanum zirconate titanate (PLZT) ink was developed, several kinds of three-dimensional structures with filament diameter of 200 μm were constructed from this ink by the direct ink writing method, and the structure parameters were modified. The ink shows shear-thinning behavior and the sample sintered at 1050 ℃ in a Pb-rich atmosphere exhibits a fine ceramic forming result, with the sintering shrinkage rate of 25%. The S-shaped stepped construction can be used in the preparation of 2-2 piezoelectric composites, while those three-dimensional woodpile and cylindrical structures can be used to process 3-3 piezoelectric composites. 3-3 PLZT-Epoxy piezoelectric composite was produced by the woodpile structure as an example. The direct ink writing technique has the merits to design and prepare the complex three-dimensional structures with different shapes and high precision, which provide a potential method for preparation of composite scaffolds.