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| 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 |
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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%.
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Received: 28 October 2014
Published: 05 November 2015
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2015, Vol. 25 
