Evolution of microstructure and dimension of
as-molded parts during thermal removal
process of wax-based MIM binder
as-molded parts during thermal removal
process of wax-based MIM binder
(The National Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, P.R.China)
Central South University, Changsha 410083, P.R.China)
Abstract: The evolution of the microstructure and the dimension of as-molded parts were studied on the basis of the thermogravimetric analysis of wax-based MIM binder. The results show that the binder removal speeds are different in different temperature ranges during binder removal process. The evolution of the microstructure of as-molded parts during binder removal process clearly showed the initiation and formation of connected pore structure, which is the removal channel of the binder. The as-molded parts almost continuously shrank through binder removal process, except an expansion stage during 320～440 ℃, which is the dissolution expansion effect due to the dissolution of VPW in the polymer melt.
Key words: binder; as-molded parts; microstructure; dimension