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Simultaneous Spark Plasma Sintering of Multiple Complex Shapes

Journal Article · · Materials
DOI:https://doi.org/10.3390/ma12040557· OSTI ID:1611092
 [1];  [2];  [3]
  1. San Diego State Univ., CA (United States); DOE/OSTI
  2. San Diego State Univ., CA (United States)
  3. San Diego State Univ., CA (United States); Univ. of San Diego, San Diego, CA (United States)

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.

Research Organization:
San Diego State Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0008581
OSTI ID:
1611092
Journal Information:
Materials, Journal Name: Materials Journal Issue: 4 Vol. 12; ISSN 1996-1944; ISSN MATEG9
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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