(1. 中南大學 粉末冶金國家重點實驗室， 長沙 410083;
2. 中國兵器工業(yè)部 803廠， 西安 710016)
摘 要: 研究了溶劑脫脂中脫脂率與溶劑、脫脂時間、樣品厚度和溶劑溫度等參數(shù)的關系。結果表明，采用多組元低分子有機溶劑的混合物在45 ℃下溶劑脫脂效果最好。樣品厚度對溶劑脫脂時間、脫脂率等的影響顯著，厚度為1 mm厚的樣品在脫脂4h時，其脫脂率可達70%以上，厚度為10mm厚的樣品在溶劑脫脂6～8h時，脫脂率僅43%。對于直徑為20 mm厚的大棒，溶劑脫脂24～30h時，脫脂量50%～60%，其余粘結劑采用熱脫脂工藝脫脂。
關鍵字: 鎢基高比重合金； 粉末注射成形； 溶劑脫脂
tungsten heavy alloy injection parts
QU Xuan-hui1, HUANG Bai-yun1, SUN Ling2
（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
