Void Formation and Part Growth During Non-Isothermal Powder Sintering

摘要CTS-9612676 本计画旨在探讨粉末材料选择性雷射烧结之热传特性。 SLS技术对于快速成型来说是相对较新的。 通过选择性地加热粉末，将发生粉末的非等温烧结，并且随后将发生不均匀的致密化。 因为固体的最终形状强烈地依赖于材料如何固结，所以在空隙水平处发生的致密化影响宏观尺度固体的最终形状。 该项目的目标是了解发生的热传递过程，并开发一个模型来预测固体的最终形状。 这样的模型可以用来预测如何最大限度地减少不必要的增长和提高制造效率。 将进行实验以在各种非等温条件下生长固体。 将开发基于体积平均配方的数学模型来预测生长的固体的形状。

Abstract CTS-9612676 The proposed project is to investigate heat transfer during selective laser sintering (SLS) of powdered materials. The SLS technique is relatively new for rapid prototyping. By selectively heating powders, non-isothermal sintering of powders would occur and uneven densification would follow. Because the ultimate shape of the solid is strongly dependent on how the material consolidates, the densification occurring at the void level affects the ultimate shape of the macroscale solid. The goal of the project is to understand the heat transfer process taking place and develop a model to predict the final shape of the solid. Such a model could us used to predict ways to minimize unwanted growth and improve manufacturing efficiency. Experiments will be conducted to grow solids under various non-isothermal conditions. A mathematical model based on a volume-average formulation will be developed to predict the shape of the grown solids.