Li He, Liu Yongsheng, Liu Yansong, Wang Jing, Zeng Qingfeng, Hu Kehui, Lu Zhigang
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an, China.
Department of Mechanical Engineering, Tsinghua University, Beijing, China.
3D Print Addit Manuf. 2020 Feb 1;7(1):8-18. doi: 10.1089/3dp.2019.0060. Epub 2020 Feb 13.
Herein, the influence of vacuum debinding temperature on microstructure and mechanical properties of three-dimensional-printed alumina is systematically investigated by employing a variety of characterization techniques. The results reveal that the debinding temperature >400°C resulted in negligible weight loss. Moreover, the crystallite size of the sintered alumina decreased with increasing debinding temperature. The lower debinding temperature of 300-350°C did not remove the photosensitive resin, which resulted in a loose lamellar structure. However, the higher debinding temperature (450-600°C) resulted in several irregular small-sized particles. Moreover, the size of alumina particles increased after the sintering process. The Raman analysis revealed that the debinded samples contain C, Al, and O; however, the C has not been detected after sintering. In general, the physical properties, such as shrinkage, open porosity, and relative density, exhibited a close relationship with the flexural strength, which is influenced by the debinding temperature. Based on the physical properties and processing requirements, the optimal vacuum debinding temperature should be in the range of 400-500°C.
在此，通过采用多种表征技术，系统地研究了真空脱脂温度对三维打印氧化铝微观结构和力学性能的影响。结果表明，脱脂温度>400°C时重量损失可忽略不计。此外，烧结氧化铝的晶粒尺寸随脱脂温度的升高而减小。300-350°C的较低脱脂温度未能去除光敏树脂，导致形成疏松的层状结构。然而，较高的脱脂温度（450-600°C）导致出现几个不规则的小尺寸颗粒。此外，烧结后氧化铝颗粒的尺寸增大。拉曼分析表明，脱脂后的样品含有C、Al和O；然而，烧结后未检测到C。总体而言，诸如收缩率、开孔率和相对密度等物理性能与弯曲强度密切相关，而弯曲强度受脱脂温度的影响。基于物理性能和加工要求，最佳真空脱脂温度应在400-500°C范围内。
