The Ceramic On-Demand Extrusion (CODE) process has been recently proposed for additive manufacturing of dense, strong ceramic components via extrusion with uniform layered drying. This study focuses on enabling CODE to fabricate functionally graded ceramics. A controlled volumetric flowrate for each ceramic paste was used to achieve a gradient between alumina and zirconia. A dynamic mixer was built to mix constituent ceramic pastes homogeneously. Functionally graded alumina/zirconia samples were printed, sintered, and tested to examine the capability of CODE in fabricating functionally graded components. The desired and actual material compositions were compared using energy dispersive spectroscopy. Dimensions of sintered samples were evaluated to study the deformation of functionally graded components during drying and sintering. Vickers hardness was also measured at different locations, corresponding to different material compositions. Finally, a case study was conducted to demonstrate the capability of the proposed method to build functionally graded ceramics with complex geometries.

最近提出了按需陶瓷挤压（CODE）工艺，用于通过挤压和均匀分层干燥来增材制造致密，坚固的陶瓷组件。这项研究的重点是使CODE能够制造功能梯度陶瓷。使用每种陶瓷浆料的受控体积流量来实现氧化铝和氧化锆之间的梯度。建立了动态​​混合器以均匀混合组成的陶瓷浆料。对功能分级的氧化铝/氧化锆样品进行印刷，烧结和测试，以检查CODE在制造功能分级的组件中的能力。使用能量色散光谱法比较了所需的材料成分和实际的材料成分。评价烧结样品的尺寸以研究干燥和烧结过程中功能梯度成分的变形。还在不同位置测量了维氏硬度，对应于不同的材料成分。最后，进行了案例研究，以证明所提出的方法能够构建具有复杂几何形状的功能梯度陶瓷。