Yan Xiaokang, Wang Chao, Xiong Wei, Hou Tongwei, Hao Liang, Tang Danna
Gemological Institute, China University of Geosciences Wuhan 430074 Chian
Zhengzhou Vocational University of Information and Technology Zhengzhou 450046 China.
RSC Adv. 2018 Mar 14;8(19):10355-10360. doi: 10.1039/c7ra13149f. eCollection 2018 Mar 13.
To explore the thermal debinding mass transfer mechanism and dynamics of an innovative copper paste injection 3D printing method, the thermal behavior of the copper paste was investigated to clarify the stages of the debinding process. Furthermore, the debinding ratio, burnout ratio, shrinkage and microstructures were characterized to study the mass transfer channel and dynamics. The dynamics equation of diffusion mass transfer was analyzed. The activation energy and pre-exponential factor were calculated. The results revealed that gas phase mass transfer was the main mass transfer path and the diffusion coefficient in the carbon powder embedded environment (2.68 × 10 cm s) was higher than that in air atmosphere (1.96 × 10 cm s). Moreover, the migration of solid phase materials and the diffusion of atoms are also discussed. When combined with the sintering process, the sintered metal parts had a smooth surface flatness and excellent metallurgical bonding, the thin wall of which was only 340 μm thick.
为了探究一种创新的铜膏注射3D打印方法的热脱脂传质机理和动力学，对铜膏的热行为进行了研究，以阐明脱脂过程的各个阶段。此外，对脱脂率、烧失率、收缩率和微观结构进行了表征，以研究传质通道和动力学。分析了扩散传质的动力学方程。计算了活化能和指前因子。结果表明，气相传质是主要的传质路径，碳粉嵌入环境中的扩散系数（2.68×10 cm s）高于空气气氛中的扩散系数（1.96×10 cm s）。此外，还讨论了固相材料的迁移和原子的扩散。当与烧结过程相结合时，烧结后的金属零件具有光滑的表面平整度和优异的冶金结合，其薄壁仅为340μm厚。
