Slip-Casting of Copper Powder
It has been demonstrated that copper powder can be slip-cast using sodium alginate as a deflocculant binder and water as a liquid vehicle. The results show that spherically shaped powder is preferable to irregularly shaped powder for the production of copper slip-castings. The viscosity of a copper slip is related to its pH value and exhibits a minimum in the normal pH range. Samples exposed to various thermal cycles in a dissociated ammonia atmosphere showed that the density of slip-cast copper powder increases with increasing sintering time and temperature. Lowering the water-metal ratio increases the viscosity, the as-dried strength, as-dried density, and the sintered density, and decreases the shrinkage of castings. Vibration has a slightly beneficial effect on the properties of a copper slip-casting.
KeywordsSodium Alginate Metal Powder Copper Powder Sintered Density Slip Casting
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