Void Formation and Part Growth During Non-Isothermal Powder Sintering

摘要 CTS-9612676 拟议项目是研究粉末材料选择性激光烧结 (SLS) 过程中的传热。 SLS 技术对于快速原型制作而言相对较新。 通过选择性地加热粉末，粉末会发生非等温烧结，从而导致不均匀的致密化。 由于固体的最终形状很大程度上取决于材料的固结方式，因此在空隙水平发生的致密化会影响宏观固体的最终形状。 该项目的目标是了解正在发生的传热过程并开发模型来预测固体的最终形状。 我们可以使用这样的模型来预测如何最大限度地减少不必要的增长并提高制造效率。 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公式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.