The modified catalytic debinding binder and its application research
XU Xiao-ming1, LI Du-xin1, WU Wei1, YANG Zhong-chen2
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China 2. Changsha Juzhong Metallurgy Technology Co. Ltd., Changsha 410083, China
Abstract：A modified catalytic debinding binder was developed and applied to the iron-based porous materials injection molding. The results show that feedstock of the binder exhibites pseudoplastic and good rheological properties, while the non-newton index[n]and the viscous flow activation energy[E]are 0.378 and 40.89 kJ/mol respectively at 180 ℃, 1 961 s－1 shear rate. Using HNO3 as catalyst, catalytic degreasing rate is quick and up to 1 mm/h, and the debinding rate reaches 85.6% after catalytic debinding for 5 h. The porous materials prepared by powder injection molding method show uniform pores distribution. Besides, the tensile strength of the porous materials is 460.68 MPa while the opening porosity is 19.44%.
2015, Vol. 25 
