寒天の金属射出成形用バインダへの適用に関する研究

概要

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This paper proposes agar as metal injection molding (MIM) binder in stead of usual plastic binders, expecting simple MIM process without debinding. Agar is natural material extracted from seaweeds and it can keep water in its structure. And agar is soluble in water at near 1OO℃ and gelation of aqueous solution nkes place at around 40℃. More the transformation is reversible. Firstly thermal stability, solubility into water and viscosity were examined and it was found agar up to 30% can be solved into water. Secondly titaniurn green compacts with agar binder were formed by uniaxial pressing and then they were sintered without debindirrg process. Obtained sintered compacts did not have any cracks on the suface at all. Finally 20 pieces of titanium samples with agar binder were inj ected. The density distnibuion of samples was within 5% Then these were sinteled at 1200℃ for I hour in vacuurn and, from the measurements of density and hardness, it is concluded that agar binder is available for MIM process.
公益社団法人精密工学会の論文
2001-02-05