Simultaneous Spark Plasma Sintering of Multiple Complex Shapes
Simultaneous Spark Plasma Sintering of Multiple Complex Shapes
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DOI：
10.3390/ma12040557
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发表时间：
2019-02-02
期刊：
影响因子：
3.4
通讯作者：
Olevsky, Eugene A.
中科院分区：
文献类型：
--
作者：
Maniere, Charles;Torresani, Elisa;Olevsky, Eugene A.
这项工作解决了放电等离子烧结（SPS）工艺的两大挑战：复杂形状的烧结和多个零件的同时生产。采用一种新的可控界面法对两种镍齿轮进行了SPS同步强化。石墨可变形子模具专门设计用于在独特的40 mm粉末变形空间中使两个复杂部件相互致密化。开发了一种能量有效的SPS配置，以允许在低于900 A的电流下烧结大规模粉末组件。开发过程的稳定性进行了研究，电热机械（ETM）模拟。的ETM模拟表明，均匀的致密化条件，可以通过在样品/冲头接口插入氧化铝粉末，使能量有效的加热和热约束的镍粉实现。最后，论证了两种组织均匀的近终形齿轮制造的可行性。
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 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.