3D Printing of a Robust Polyamide‐12‐Carbon Black Composite via Selective Laser Sintering: Thermal and Electrical Conductivity

2019 ◽  
Vol 304 (4) ◽  
pp. 1800718 ◽  
Author(s):  
Alejandro H. Espera ◽  
Arnaldo D. Valino ◽  
Jerome O. Palaganas ◽  
Lucio Souza ◽  
Qiyi Chen ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
3D Printing ◽  
Carbon Black ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12

Colorometric study of polyamide-12 powder aging

2020 ◽  
Vol 86 (10) ◽  
pp. 31-35
Author(s):  
N. Ya. Mokshina ◽  
V. V. Khripushin ◽  
M. S. Shcherbakova
Keyword(s):  
3D Printing ◽  
Selective Laser Sintering ◽  
Colorimetric Method ◽  
Critical Factor ◽  
Thermal Exposure ◽  
Practical Experience ◽  
Laser Sintering ◽  
Computer Processing ◽  
Polyamide 12 ◽  
Long Term Storage

The key point of 3D printing by selective laser sintering is the necessity of complete filling of the working chamber of the printer with a powder material. Since the powder is not completely consumed during the printing process, 25 – 30 wt.% of secondary (unused in the previous cycle) power is added to the primary material in each cycle. Repeated recirculation leads to degradation of the properties of the working powder mixture and increases the probability of rejects. We present the results of a colorimetric study of aging of polyamide-12 powder used in 3D printing by the method of selective laser sintering. Scanning and computer processing of digital images of primary and secondary polyamide powders obtained by colorimetry were performed using MathLab program package. Colorimetric analysis included the expression of the sample color using the parameters of color models applied in digital technologies for synthesizing colored images. The number of cycles before the onset of intensive destruction is no more than three, which is consistent with the practical experience in printing by selective laser sintering. The results characterizing change in the color of the secondary powder depending on the duration of thermal exposure and the gas medium are presented. It is shown that long-term storage of the powder for subsequent use is not advisable, since the initiators of destruction are already present in the material. Thermal oxidative destruction is shown to be a critical factor limiting the use of secondary powder along with changes in the crystallinity and fractional composition of particles. Computer processing of images of polymer powder obtained by the colorimetric method can be used to control the aging process of consumables and to predict the probability of rejections in 3D printing.

Comparative study on 3D printing of polyamide 12 by selective laser sintering and multi jet fusion

2021 ◽  
Vol 288 ◽  
pp. 116882 ◽  
Author(s):  
Chao Cai ◽  
Wei Shian Tey ◽  
Jiayao Chen ◽  
Wei Zhu ◽  
Xingjian Liu ◽  
...  
Keyword(s):  
3D Printing ◽  
Comparative Study ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12

Covalent adaptable networks of polydimethylsiloxane elastomer for selective laser sintering 3D printing

2021 ◽  
Vol 412 ◽  
pp. 128675
Author(s):  
Shaojie Sun ◽  
Guoxia Fei ◽  
Xiaorong Wang ◽  
Miao Xie ◽  
Quanfen Guo ◽  
...  
Keyword(s):  
3D Printing ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polydimethylsiloxane Elastomer

scholarly journals Fabrication of Porous Hydrogenation Catalysts by a Selective Laser Sintering 3D Printing Technique

ACS Omega ◽  
2019 ◽  
Vol 4 (7) ◽  
pp. 12012-12017 ◽  
Author(s):  
Elmeri Lahtinen ◽  
Lotta Turunen ◽  
Mikko M. Hänninen ◽  
Kalle Kolari ◽  
Heikki M. Tuononen ◽  
...  
Keyword(s):  
3D Printing ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Hydrogenation Catalysts ◽  
Printing Technique ◽  
3D Printing Technique
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