3D打印纯铜坯体热脱脂过程形状优化研究

Shape Optimization in Thermal Debinding Process of 3D-Printed Pure Copper Green Parts

摘要:

铜及其合金因其高导热性在热管理领域展现出巨大的应用潜力，3D打印技术是拓展其应用场景的关键。脱脂技术是限制其打印技术发展的主要因素之一。本研究建立了粘结剂喷射（binder jetting，BJ）打印坯体的热脱脂质量量化指标，并对BJ打印坯体内部的粘结剂分布进行了优化，对不同优化方式的优化结果进行了对比与实验验证。研究发现，坯体内部的粘结剂分布优化区域的最佳参数为S₁/S₀=0.6，R₁/R₀=0.4，R₂/R₀=0.8。粘结剂空间分布的形状优化结果也呈现出上窄下宽的喇叭形状。对其进行打印验证，发现其打印效果并无明显差异。对相同整体粘结剂含量的不同粘结剂分布策略的抗压强度进行分析发现，形状优化相较未优化时提高了10%。

Abstract:

Copper and its alloys exhibit great application potential in the field of thermal management due to their high thermal conductivity, while 3D printing technique serves as the key to expand their applications. Debinding technique is one of the main factors restricting the development of 3D printing technique. Quantitative indicators for the thermal debinding quality of binder jetting (BJ) printed green parts are established. The binder distribution inside the BJ-printed green parts is optimized, and the optimization results of different strategies are compared and verified through experiments. The results show that the optimal parameters for the optimized area of the binder distribution inside the green part are S₁/S₀=0.6, R₁/R₀=0.4, and R₂/R₀=0.8. The shape-optimized result of the binder distribution also shows a flared shape, which is narrower at the top and wider at the bottom. After printing verification, it is found that there is no significant difference in the printing effect. Analysis of the compressive strength of different binder distribution strategies with the same overall binder content reveals that the shape optimization improves the performance by 10% compared with that of the non-optimized case.