(1. 中南大学 粉末冶金国家重点实验室， 长沙 410083;
2. 中国兵器工业部 803厂， 西安 710016)
摘 要: 研究了溶剂脱脂中脱脂率与溶剂、脱脂时间、样品厚度和溶剂温度等参数的关系。结果表明，采用多组元低分子有机溶剂的混合物在45 ℃下溶剂脱脂效果最好。样品厚度对溶剂脱脂时间、脱脂率等的影响显著，厚度为1 mm厚的样品在脱脂4h时，其脱脂率可达70%以上，厚度为10mm厚的样品在溶剂脱脂6～8h时，脱脂率仅43%。对于直径为20 mm厚的大棒，溶剂脱脂24～30h时，脱脂量50%～60%，其余粘结剂采用热脱脂工艺脱脂。
关键字: 钨基高比重合金； 粉末注射成形； 溶剂脱脂
tungsten heavy alloy injection parts
（1. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, P.R.China;
2. 803 Factory of Army Industry Ministry of China,
Xi′an 710043, P.R.China）
Abstract: The solvent debinding process was studied, including the relationship of binder loss with solvent composition, debinding time, sample thickness, and solvent debinding temperature and so on. The experiment shows that the multi-component low molecule solvent mixture has best results at 45 ℃. The effects of sample thickness on solvent debinding time and binder loss are dominant. With the thickness of 1 mm, the binder removal is above 70% after debinding for 4 h, while with the thickness of 10 mm, the binder removal is only 43% after debinding for 6～8 h. For the diameter of 20 mm bar, the binder loss is 50%～60% after debinding for 24～30 h, the residual binder is removed completely by thermal debinding. All experiments show that solvent debinding greatly shortens the subsequent thermal debinding time, and the large thick injected parts can be successfully debound. After solvent debinding, the parts were observed by using scanning electronic microscopy (SEM).
Key words: tungsten heavy alloy; powder injection molding; solvent debinding
