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Open AccessArticle

Feedstocks of Aluminum and 316L Stainless Steel Powders for Micro Hot Embossing

1
CEMMPRE, Centre for Mechanical Engineering, Materials and Processes, Department of Metallurgical and Materials Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
2
CEMMPRE, Centre for Mechanical Engineering, Materials and Processes, Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal
3
INEGI—Institute of Science and Innovation in Mechanical and Industrial Engineering, Rua. Dr. Roberto Frias, 4200-465 Porto, Portugal
*
Author to whom correspondence should be addressed.
Metals 2018, 8(12), 999; https://doi.org/10.3390/met8120999
Received: 15 October 2018 / Revised: 14 November 2018 / Accepted: 23 November 2018 / Published: 28 November 2018
(This article belongs to the Special Issue Metal Micro-forming)
In metal powder, shaping the preparation and characterization of the feedstock is an aspect commonly recognized as fundamental. An optimized composition is required to ensure the successful shaping of the feedstock. In this study, a commercial binder system, pure aluminum and 316L austenitic stainless-steel powders were used for micro hot embossing. The optimization process revealed that powder characteristics such as shape and the stability of the torque mixing, were important parameters. Manipulating the feedstock composition by adding multi-walled carbon nanotubes or stearic acid or using a higher powder concentration considerably influenced the torque mixing values. The steady state of torque mixing was achieved for all feedstocks. This torque behavior indicates a homogeneous feedstock, which was also confirmed by microscopic observations. Nevertheless, an extruding process was required for greater homogeneity of the aluminum feedstocks. The presence of the carbon nanotubes increased the homogeneity of green parts and reduced microcrack formation. The roughness was essentially dependent on the feedstock composition and on the plastic deformation of the elastomer die. Shaping the prepared feedstocks (with or without carbon nanotube) was achieved by the optimized powder concentrations and it did not increase by the stearic acid addition. View Full-Text
Keywords: carbon nanotubes; feedstock; homogeneity; metallic powders; micro hot embossing; shaping carbon nanotubes; feedstock; homogeneity; metallic powders; micro hot embossing; shaping
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MDPI and ACS Style

Emadinia, O.; Vieira, M.T.; Vieira, M.F. Feedstocks of Aluminum and 316L Stainless Steel Powders for Micro Hot Embossing. Metals 2018, 8, 999.

AMA Style

Emadinia O, Vieira MT, Vieira MF. Feedstocks of Aluminum and 316L Stainless Steel Powders for Micro Hot Embossing. Metals. 2018; 8(12):999.

Chicago/Turabian Style

Emadinia, Omid; Vieira, Maria T.; Vieira, Manuel F. 2018. "Feedstocks of Aluminum and 316L Stainless Steel Powders for Micro Hot Embossing" Metals 8, no. 12: 999.

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