陶瓷吸波超材料结构光固化增材制造工艺研究

Research on Light Curing Additive Manufacturing Technology of Ceramic Absorbing Metamaterial Structure

陶瓷超材料吸波器具有耐高温、高强度、可完美吸波的特点,其结构复杂且具有周期性,是一种新兴的吸波器件。但传统成形方式在复杂结构制造上存在一定的局限性。本文提出一种基于光固化增材制造氧化铝陶瓷表面镀铁氧体的方法实现周期性复杂结构的陶瓷超材料吸波器。使用氧化铝粉末和光敏树脂,配制出可供3D打印的氧化铝陶瓷浆料,利用3D打印机成形氧化铝陶瓷坯体。根据TG‑DSC热分析法,确定了陶瓷坯体的脱脂工艺参数,烧结出氧化铝陶瓷样件。再利用浸渍法在氧化铝样件表面镀铁氧体膜,并烧结使其致密化。使用SEM观察样件表面形貌,通过X射线衍射分析物相组成,利用划痕法测试镀层的结合力。结果表明,本文提出的方法可以实现周期性复杂结构的陶瓷吸波器快速制造,为新型超材料吸波器的设计与制造提供了新的思路。

The ceramic‑based metamaterial wave absorber is characterized by high temperature resistance,high strength and perfect wave absorption.Its structure is complex and periodic,which is a new kind of absorbing device.However,the traditional ceramic forming method has some limitations in complex structure manufacturing.A new method based on additive manufacturing to fabricate ferrite coating on alumina ceramic surface is presented to realize a periodic ceramic metamaterial absorber with complex structure.Using alumina powder and photosensitive resin,alumina ceramic paste for 3D printing is prepared to form alumina ceramic body.According to TG‑DSC thermal analysis,the degreasing process parameters of ceramic billet are determined,and alumina ceramic samples are sintered.Then the surface of alumina sample is impregnated with ferrite film and densified by sintering.Scanning electron microscope(SEM)is used to observe the surface morphology of the sample,X‑ray diffraction is used to analyze the phase composition of the sample,and scratch method is used to test the adhesion of the coating.The results show that the proposed method can realize the rapid manufacture of ceramic absorbers with periodic complex structure,which provides a new idea for the design and manufacture of new metamaterial absorbers.