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Rajiv M. Sachanandani,Stephen J. Lombardo 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.2
Multilayer ceramic green bodies, prepared with barium titanate as the dielectric and poly(vinyl butyral) and butyl benzyl phthalate as the main components of the binder, have been subjected to rapid heating cycles in order to cause failure to occur. In one approach, the heating rate was held constant and the dimensions of the green bodies were varied, while in the second method, the size of the green body was held constant and the heating rate was varied. In all cases, failure of the green body occurred between 115-140 oC. Models were then used to establish that at failure, the binder loading was high and that the internal pressure in the center of the green body was nearly constant, independent of the method used to cause the samples to fail. The internal pressure was then used as an input into a previously-developed algorithm in order to develop rapid debinding cycles without causing component failure.
Rajiv Sachanandani,Stephen J. Lombardo 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.1
A model is developed to describe the evolution of pressure, stress, and green body strength in porous ceramic bodies during the thermal debinding heating cycle. Pressure in the green body arises from the thermally activated decomposition of the binder, and the pressure increase is mitigated by flow through the porous medium. The stress then arises from the pressure gradient within the green ceramic body. The strength model incorporates the effects of solids and binder loading, and the effect of temperature on the yield behavior of the binder. The stress is then compared to the strength of the green body during the heating cycle in order to determine when failure occurs. The assumptions, the necessary experimental data, and the weaknesses in the model are discussed.