注射成形铜/钨复合材料溶剂脱脂行为研究
Solvent Degreasing Behavior of Copper / Tungsten Composites Prepared by MIM
刘 捷， 谢 明， 刘满门， 韩 波
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作者单位：昆明贵金属研究所，云南 昆明 650106
中文关键字：注射成形； 铜钨复合材料； 溶剂脱脂； 动力学参数
英文关键字：metal injection molding (MIM ); copper / tungsten composites; solvent degreasing; dynamics parameters
中文摘要：以注射成形铜/钨复合材料生坯为研究对象，采用二氯甲烷为溶剂，对成分为CuW5以及CuW15的两种成分的生坯，采用不同粉末装载量、不同形状的试样进行溶剂脱脂。重点考察了溶剂脱脂工艺参数对脱脂行为的影响，还就坯件本征特点对于溶剂脱脂行为的影响进行了分析探讨，最后计算了本实验条件下，用二氯甲烷脱脂的动力学参数，为后续实验条件的设定提供了理论依据。实验结果显示，脱脂温度与时间对于溶剂脱脂是综合外因；在研究脱脂行为时，考虑坯件本体特征的影响十分重要，坯件厚度对于溶剂脱脂影响很大，形状的复杂性几乎不影响脱脂率。粉末形态不够规则，生坯内部孔隙多，溶剂脱脂更易持续进行，达到更大的脱脂量。脱脂初期脱脂速率由扩散控制，呈线性变化，当脱脂时间达到10 h以后，脱脂速率将转变为由溶解和扩散混合控制。
英文摘要：Taking copper / tungsten composites green parts prepared by MIM as investigation object and carrene as solvent, the solvent degreasing behavior of two kinds of copper / tungsten composites, Cu-5wt%W and Cu-15wt%W, prepared by MIM were researched. The results show that the degreasing temperature and degreasing time are external causes of solvent degreasing; the character and thickness of the parts have great effect on solvent degreasing, the complexity of the part shape almost has no effect on solvent degreasing; the irregular powder shape and more holes in green parts are favourable to solvent degreasing; at the incipient stage of degreasing, the degreasing rate is controlled by diffusion and changes linearly, after 10 h degreasing, the degreasing rate is controlled by both diffluence and diffusion.