论文标题
多个复杂形状的同时火花等离子体烧结
Simultaneous Spark Plasma Sintering of Multiple Complex Shapes
论文作者
论文摘要
这项工作解决了火花等离子体烧结（SPS）过程的两个巨大挑战：复杂形状的烧结和同时生产多个部分。采用了一种新的可控界面方法来同时通过SPS合并两个镍齿轮形状。石墨可变形的子数字是专门设计用于在独特的40 mm粉末变形空间中两个复合部件相互致密化的。开发了节能SPS构型，以允许在低于900的电流下烧结大规模粉末组件。 ETM模拟表明，可以通过在样品/打孔界面上插入氧化铝粉，从而实现能节能加热和镍粉的热限制来实现均匀的致密条件。最后，证明了用非常均匀的微观结构的两个近网齿轮制造的可行性。
This work addresses the two great challenges of the spark plasma sintering (SPS) process: the sintering of complex shapes and the simultaneous production of multiple parts. A new controllable interface method is employed to concurrently consolidate two nickel gear shapes by SPS. A graphite deformable sub-mold is specifically designed for the mutual densification of the both complex parts in a unique 40 mm powder deformation space. An energy efficient SPS configuration is developed to allow the sintering of a large-scale powder assembly under electric current lower than 900 A. The stability of the developed process is studied by electro-thermal-mechanical (ETM) simulation. The ETM simulation reveals that homogeneous densification conditions can be attained by inserting an alumina powder at the sample/punches interfaces enabling the energy efficient heating and the thermal confinement of the nickel powder. Finally, the feasibility of the fabrication of the two near net shape gears with a very homogeneous microstructure is demonstrated.
